From 12da3b9269ea56dc940c8196c87da5dc34d64df2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=2E=C2=A0S=2E=C2=A0Choi?= <jschoi@jschoi.org>
Date: Sun, 8 Jul 2018 15:57:43 -0400
Subject: [PATCH] Implement Smart Pipeline proposal in @babel/parser

---
 .../babel-parser/src/parser/expression.js     | 312 ++++++++++-
 packages/babel-parser/src/parser/statement.js | 156 ++++--
 packages/babel-parser/src/tokenizer/index.js  |  60 ++-
 packages/babel-parser/src/tokenizer/state.js  |   9 +
 packages/babel-parser/src/tokenizer/types.js  |  15 +
 packages/babel-parser/src/types.js            |  26 +
 .../with-pipeline/options.json                |   6 +-
 .../options.json                              |   4 -
 .../arrow-requires-parens/options.json        |   4 -
 .../await-requires-parens/options.json        |   3 -
 .../pipeline-operator/base/options.json       |   3 -
 .../pipeline-operator/chain/options.json      |   3 -
 .../{base => invalid-proposal}/input.js       |   0
 .../invalid-proposal/options.json             |   6 +
 .../pipeline-operator/multiline/options.json  |   3 -
 .../pipeline-operator/precedence/options.json |   3 -
 .../input.js                                  |   0
 .../options.json                              |   6 +
 .../input.js                                  |   0
 .../options.json                              |   6 +
 .../input.js                                  |   0
 .../options.json                              |   5 +
 .../output.json                               |   0
 .../input.js                                  |   0
 .../options.json                              |   4 +-
 .../input.js                                  |   0
 .../options.json                              |   4 +-
 .../proposal-minimal-base/input.js            |   1 +
 .../proposal-minimal-base/options.json        |   5 +
 .../output.json                               |   0
 .../input.js                                  |   0
 .../proposal-minimal-chain/options.json       |   5 +
 .../output.json                               |   0
 .../input.js                                  |   0
 .../proposal-minimal-multiline/options.json   |   5 +
 .../output.json                               |   0
 .../input.js                                  |   0
 .../proposal-minimal-precedence/options.json  |   5 +
 .../output.json                               |   0
 .../input.js                                  |   0
 .../options.json                              |   5 +
 .../output.json                               |   0
 .../input.js                                  |   0
 .../proposal-minimal-with-arrow/options.json  |   5 +
 .../output.json                               |   0
 .../input.js                                  |   6 +
 .../options.json                              |   5 +
 .../output.json                               | 401 ++++++++++++++
 .../input.js                                  |   3 +
 .../options.json                              |   3 +
 .../output.json                               | 249 +++++++++
 .../input.js                                  |   3 +
 .../options.json                              |   3 +
 .../output.json                               | 234 +++++++++
 .../input.js                                  |   3 +
 .../options.json                              |   3 +
 .../output.json                               | 168 ++++++
 .../input.js                                  |   4 +
 .../options.json                              |   3 +
 .../output.json                               | 348 ++++++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 233 +++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 152 ++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 185 +++++++
 .../input.js                                  |   4 +
 .../options.json                              |   3 +
 .../output.json                               | 348 ++++++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 233 +++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 115 ++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 214 ++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   3 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   4 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   4 +
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 184 +++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 251 +++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 165 ++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 214 ++++++++
 .../input.js                                  |   7 +
 .../options.json                              |   3 +
 .../output.json                               | 384 ++++++++++++++
 .../input.js                                  |   3 +
 .../options.json                              |   3 +
 .../output.json                               | 298 +++++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 149 ++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 149 ++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 262 +++++++++
 .../input.js                                  |   3 +
 .../options.json                              |   3 +
 .../output.json                               | 298 +++++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 357 +++++++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 210 ++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 211 ++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 161 ++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 256 +++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 223 ++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 194 +++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 231 ++++++++
 .../input.js                                  |   7 +
 .../options.json                              |   3 +
 .../output.json                               | 419 +++++++++++++++
 .../input.js                                  |   7 +
 .../options.json                              |   3 +
 .../output.json                               | 360 +++++++++++++
 .../input.js                                  |   5 +
 .../options.json                              |   3 +
 .../output.json                               | 495 ++++++++++++++++++
 .../input.js                                  |   5 +
 .../options.json                              |   3 +
 .../output.json                               | 477 +++++++++++++++++
 .../input.js                                  |   4 +
 .../options.json                              |   3 +
 .../output.json                               | 412 +++++++++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 262 +++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 147 ++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 215 ++++++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 117 +++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 113 ++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 113 ++++
 .../input.js                                  |   1 +
 .../options.json                              |   3 +
 .../output.json                               | 172 ++++++
 .../with-arrow-parend-params/options.json     |   3 -
 .../pipeline-operator/with-arrow/options.json |   3 -
 223 files changed, 11297 insertions(+), 107 deletions(-)
 delete mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/arrow-requires-parens-with-parend-args/options.json
 delete mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/arrow-requires-parens/options.json
 delete mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/await-requires-parens/options.json
 delete mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/base/options.json
 delete mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/chain/options.json
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{base => invalid-proposal}/input.js (100%)
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/invalid-proposal/options.json
 delete mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/multiline/options.json
 delete mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/precedence/options.json
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{arrow-requires-parens-with-parend-args => proposal-minimal-arrow-requires-parens-with-parend-args}/input.js (100%)
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-arrow-requires-parens-with-parend-args/options.json
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{arrow-requires-parens => proposal-minimal-arrow-requires-parens}/input.js (100%)
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-arrow-requires-parens/options.json
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{await-requires-parens => proposal-minimal-await-requires-parens}/input.js (100%)
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-await-requires-parens/options.json
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{await-requires-parens => proposal-minimal-await-requires-parens}/output.json (100%)
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{ban-await-f => proposal-minimal-ban-await-f}/input.js (100%)
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{ban-await => proposal-minimal-ban-await-f}/options.json (61%)
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{ban-await => proposal-minimal-ban-await}/input.js (100%)
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{ban-await-f => proposal-minimal-ban-await}/options.json (61%)
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-base/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-base/options.json
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{base => proposal-minimal-base}/output.json (100%)
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{chain => proposal-minimal-chain}/input.js (100%)
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-chain/options.json
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{chain => proposal-minimal-chain}/output.json (100%)
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{multiline => proposal-minimal-multiline}/input.js (100%)
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-multiline/options.json
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{multiline => proposal-minimal-multiline}/output.json (100%)
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{precedence => proposal-minimal-precedence}/input.js (100%)
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-precedence/options.json
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{precedence => proposal-minimal-precedence}/output.json (100%)
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{with-arrow-parend-params => proposal-minimal-with-arrow-parend-params}/input.js (100%)
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow-parend-params/options.json
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{with-arrow-parend-params => proposal-minimal-with-arrow-parend-params}/output.json (100%)
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{with-arrow => proposal-minimal-with-arrow}/input.js (100%)
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow/options.json
 rename packages/babel-parser/test/fixtures/experimental/pipeline-operator/{with-arrow => proposal-minimal-with-arrow}/output.json (100%)
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-multiline/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-multiline/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-multiline/output.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-single-line/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-single-line/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-single-line/output.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-nested-property/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-nested-property/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-nested-property/output.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-single-identifier/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-single-identifier/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-single-identifier/output.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-multiline/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-multiline/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-multiline/output.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-single-line-arrow-function/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-single-line-arrow-function/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-single-line-arrow-function/output.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-identifier/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-identifier/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-identifier/output.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-property/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-property/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-property/output.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-multiline/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-multiline/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-multiline/output.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-single-line-arrow-function/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-single-line-arrow-function/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-single-line-arrow-function/output.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-identifier/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-identifier/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-identifier/output.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-property/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-property/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-property/output.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-bare-style,-head-with-topic-reference-pair/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-bare-style,-head-with-topic-reference-pair/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-invalid-hash-token,-followed-by-digit/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-invalid-hash-token,-followed-by-digit/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-bare-style,-no-outer-topic-reference/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-bare-style,-no-outer-topic-reference/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-inner-topic-reference/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-inner-topic-reference/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-outer-topic-reference/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-outer-topic-reference/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-inner-topic-reference/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-inner-topic-reference/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-outer-topic-reference/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-outer-topic-reference/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-followed-by-bare-style-pipeline-body/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-followed-by-bare-style-pipeline-body/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-then-end/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-then-end/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-addition/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-addition/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-class-expression/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-class-expression/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-function-expression/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-function-expression/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-body/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-body/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-body/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-body/options.json
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-body/input.js
 create mode 100644 packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-body/options.json
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diff --git a/packages/babel-parser/src/parser/expression.js b/packages/babel-parser/src/parser/expression.js
index 64868e7d591b..c87ce28a0e91 100644
--- a/packages/babel-parser/src/parser/expression.js
+++ b/packages/babel-parser/src/parser/expression.js
@@ -24,6 +24,8 @@ import LValParser from "./lval";
 import { reservedWords } from "../util/identifier";
 import type { Pos, Position } from "../util/location";
 
+const PIPELINE_PROPOSALS = ["minimal", "smart"];
+
 export default class ExpressionParser extends LValParser {
   // Forward-declaration: defined in statement.js
   +parseBlock: (allowDirectives?: boolean) => N.BlockStatement;
@@ -296,18 +298,19 @@ export default class ExpressionParser extends LValParser {
         }
 
         const op = this.state.type;
-        if (op === tt.nullishCoalescing) {
+
+        if (op === tt.pipeline) {
+          this.checkPipelineAtInfixOperator(left, leftStartPos);
+        } else if (op === tt.nullishCoalescing) {
           this.expectPlugin("nullishCoalescingOperator");
-        } else if (op === tt.pipeline) {
-          this.expectPlugin("pipelineOperator");
         }
 
         this.next();
 
-        const startPos = this.state.start;
-        const startLoc = this.state.startLoc;
-
-        if (op === tt.pipeline) {
+        if (
+          op === tt.pipeline &&
+          "minimal" === this.getPluginOption("pipelineOperator", "proposal")
+        ) {
           if (
             this.match(tt.name) &&
             this.state.value === "await" &&
@@ -320,13 +323,7 @@ export default class ExpressionParser extends LValParser {
           }
         }
 
-        node.right = this.parseExprOp(
-          this.parseMaybeUnary(),
-          startPos,
-          startLoc,
-          op.rightAssociative ? prec - 1 : prec,
-          noIn,
-        );
+        node.right = this.parseExprOpRightExpr(op, prec, noIn);
 
         this.finishNode(
           node,
@@ -336,6 +333,7 @@ export default class ExpressionParser extends LValParser {
             ? "LogicalExpression"
             : "BinaryExpression",
         );
+
         return this.parseExprOp(
           node,
           leftStartPos,
@@ -348,6 +346,55 @@ export default class ExpressionParser extends LValParser {
     return left;
   }
 
+  // Helper function for `parseExprOp`. Parse the right-hand side of binary-
+  // operator expressions, then apply any operator-specific functions.
+
+  parseExprOpRightExpr(
+    op: TokenType,
+    prec: number,
+    noIn: ?boolean,
+  ): N.Expression {
+    switch (op) {
+      case tt.pipeline:
+        if ("smart" === this.getPluginOption("pipelineOperator", "proposal")) {
+          const startPos = this.state.start;
+          const startLoc = this.state.startLoc;
+          return this.withTopicPermittingContext(() => {
+            return this.parseSmartPipelineBody(
+              this.parseExprOpBaseRightExpr(op, prec, noIn),
+              startPos,
+              startLoc,
+            );
+          });
+        } else {
+          return this.parseExprOpBaseRightExpr(op, prec, noIn);
+        }
+
+      default:
+        return this.parseExprOpBaseRightExpr(op, prec, noIn);
+    }
+  }
+
+  // Helper function for `parseExprOpRightExpr`. Parse the right-hand side of
+  // binary-operator expressions without applying any operator-specific functions.
+
+  parseExprOpBaseRightExpr(
+    op: TokenType,
+    prec: number,
+    noIn: ?boolean,
+  ): N.Expression {
+    const startPos = this.state.start;
+    const startLoc = this.state.startLoc;
+
+    return this.parseExprOp(
+      this.parseMaybeUnary(),
+      startPos,
+      startLoc,
+      op.rightAssociative ? prec - 1 : prec,
+      noIn,
+    );
+  }
+
   // Parse unary operators, both prefix and postfix.
 
   parseMaybeUnary(refShorthandDefaultPos: ?Pos): N.Expression {
@@ -886,6 +933,29 @@ export default class ExpressionParser extends LValParser {
         }
       }
 
+      case tt.primaryTopicReference: {
+        this.expectPlugin("pipelineOperator");
+        node = this.startNode();
+
+        if ("smart" !== this.getPluginOption("pipelineOperator", "proposal")) {
+          this.raise(
+            node.start,
+            "Primary Topic Reference found but pipelineOperator not passed 'smart' for 'proposal' option.",
+          );
+        }
+
+        this.next();
+        if (this.primaryTopicReferenceIsAllowedInCurrentTopicContext()) {
+          this.registerTopicReference();
+          return this.finishNode(node, "PrimaryTopicReference");
+        } else {
+          throw this.raise(
+            node.start,
+            `Topic reference was used in a lexical context without topic binding`,
+          );
+        }
+      }
+
       default:
         throw this.unexpected();
     }
@@ -1921,4 +1991,218 @@ export default class ExpressionParser extends LValParser {
     }
     return this.finishNode(node, "YieldExpression");
   }
+
+  // Validates a pipeline (for any of the pipeline Babylon plugins) at the point
+  // of the infix operator `|>`.
+
+  checkPipelineAtInfixOperator(left: N.Expression, leftStartPos: number) {
+    this.expectPlugin("pipelineOperator");
+
+    if (
+      !PIPELINE_PROPOSALS.includes(
+        this.getPluginOption("pipelineOperator", "proposal"),
+      )
+    ) {
+      this.raise(
+        leftStartPos,
+        "'pipelineOperator' requires 'proposal' option whose value should be one of: " +
+          PIPELINE_PROPOSALS.join(", "),
+      );
+    }
+
+    if ("smart" === this.getPluginOption("pipelineOperator", "proposal")) {
+      this.checkSmartPipelineHeadEarlyErrors(left, leftStartPos);
+    }
+  }
+
+  checkSmartPipelineHeadEarlyErrors(left: N.Expression, leftStartPos: number) {
+    if (left.type === "SequenceExpression") {
+      // Ensure that the pipeline head is not a comma-delimited
+      // sequence expression.
+      throw this.raise(
+        leftStartPos,
+        `Pipeline head may not be a comma-separated sequence expression`,
+      );
+    }
+  }
+
+  parseSmartPipelineBody(
+    childExpression: N.Expression,
+    startPos: number,
+    startLoc: Position,
+  ): N.PipelineBody {
+    const pipelineStyle = this.checkSmartPipelineBodyStyle(childExpression);
+
+    this.checkSmartPipelineBodyEarlyErrors(
+      childExpression,
+      pipelineStyle,
+      startPos,
+    );
+
+    return this.parseSmartPipelineBodyInStyle(
+      childExpression,
+      pipelineStyle,
+      startPos,
+      startLoc,
+    );
+  }
+
+  checkSmartPipelineBodyEarlyErrors(
+    childExpression: N.Expression,
+    pipelineStyle: PipelineStyle,
+    startPos: number,
+  ): N.PipelineBody {
+    if (this.match(tt.arrow)) {
+      // If the following token is invalidly `=>`, then throw a human-friendly error
+      // instead of something like 'Unexpected token, expected ";"'.
+      throw this.raise(
+        this.state.start,
+        `Unexpected arrow "=>" after pipeline body; arrow function in pipeline body must be parenthesized`,
+      );
+    } else if (
+      pipelineStyle === "PipelineTopicExpression" &&
+      childExpression.type === "SequenceExpression"
+    ) {
+      throw this.raise(
+        startPos,
+        `Pipeline body may not be a comma-separated sequence expression`,
+      );
+    }
+  }
+
+  parseSmartPipelineBodyInStyle(
+    childExpression: N.Expression,
+    pipelineStyle: PipelineStyle,
+    startPos: number,
+    startLoc: Position,
+  ): N.PipelineBody {
+    const bodyNode = this.startNodeAt(startPos, startLoc);
+    switch (pipelineStyle) {
+      case "PipelineBareFunction":
+        bodyNode.callee = childExpression;
+        break;
+      case "PipelineBareConstructor":
+        bodyNode.callee = childExpression.callee;
+        break;
+      case "PipelineBareAwaitedFunction":
+        bodyNode.callee = childExpression.argument;
+        break;
+      case "PipelineTopicExpression":
+        if (!this.topicReferenceWasUsedInCurrentTopicContext()) {
+          throw this.raise(
+            startPos,
+            `Pipeline is in topic style but does not use topic reference`,
+          );
+        }
+        bodyNode.expression = childExpression;
+        break;
+      default:
+        throw this.raise(startPos, `Unknown pipeline style ${pipelineStyle}`);
+    }
+    return this.finishNode(bodyNode, pipelineStyle);
+  }
+
+  checkSmartPipelineBodyStyle(
+    expression: N.Expression,
+  ):
+    | "PipelineBareFunction"
+    | "PipelineBareConstructor"
+    | "PipelineBareAwaitedFunction"
+    | "PipelineTopicExpression" {
+    switch (expression.type) {
+      case "NewExpression":
+        return this.isSimpleReference(expression.callee)
+          ? "PipelineBareConstructor"
+          : "PipelineTopicExpression";
+      case "AwaitExpression":
+        return this.isSimpleReference(expression.argument)
+          ? "PipelineBareAwaitedFunction"
+          : "PipelineTopicExpression";
+      default:
+        return this.isSimpleReference(expression)
+          ? "PipelineBareFunction"
+          : "PipelineTopicExpression";
+    }
+  }
+
+  isSimpleReference(expression: N.Expression): boolean {
+    switch (expression.type) {
+      case "MemberExpression":
+        return this.isSimpleReference(expression.object);
+      case "Identifier":
+        return true;
+      default:
+        return false;
+    }
+  }
+
+  // Enable topic references from outer contexts within smart pipeline bodies.
+  // The function modifies the parser's topic-context state to enable or disable
+  // the use of topic references with the smartPipelines plugin. They then run a
+  // callback, then they reset the parser to the old topic-context state that it
+  // had before the function was called.
+
+  withTopicPermittingContext<T>(callback: () => T): T {
+    const outerContextTopicState = this.readTopicContextState();
+    this.state.topicContextState = {
+      // Enable the use of the primary topic reference.
+      maxNumOfResolvableTopics: 1,
+      // Hide the use of any topic references from outer contexts.
+      maxTopicIndex: null,
+    };
+
+    const callbackResult = callback();
+
+    this.state.topicContextState = outerContextTopicState;
+    return callbackResult;
+  }
+
+  // Disable topic references from outer contexts within syntax constructs
+  // such as the bodies of iteration statements.
+  // The function modifies the parser's topic-context state to enable or disable
+  // the use of topic references with the smartPipelines plugin. They then run a
+  // callback, then they reset the parser to the old topic-context state that it
+  // had before the function was called.
+
+  withTopicForbiddingContext<T>(callback: () => T): T {
+    const outerContextTopicState = this.readTopicContextState();
+    this.state.topicContextState = {
+      // Disable the use of the primary topic reference.
+      maxNumOfResolvableTopics: 0,
+      // Hide the use of any topic references from outer contexts.
+      maxTopicIndex: null,
+    };
+
+    const callbackResult = callback();
+
+    this.state.topicContextState = outerContextTopicState;
+    return callbackResult;
+  }
+
+  readTopicContextState(): tt.TopicContextState {
+    return this.state.topicContextState;
+  }
+
+  // Register the use of a primary topic reference (`#`) within the current
+  // topic context.
+  registerTopicReference(): void {
+    this.state.topicContextState.maxTopicIndex = 0;
+  }
+
+  primaryTopicReferenceIsAllowedInCurrentTopicContext(): boolean {
+    return this.state.topicContextState.maxNumOfResolvableTopics >= 1;
+  }
+
+  topicReferenceWasUsedInCurrentTopicContext(): boolean {
+    return (
+      this.state.topicContextState.maxTopicIndex != null &&
+      this.state.topicContextState.maxTopicIndex >= 0
+    );
+  }
 }
+
+type PipelineStyle =
+  | "PipelineBareFunction"
+  | "PipelineBareConstructor"
+  | "PipelineBareAwaitedFunction"
+  | "PipelineTopicExpression";
diff --git a/packages/babel-parser/src/parser/statement.js b/packages/babel-parser/src/parser/statement.js
index 7bf7f55d07b5..041d8813e49d 100644
--- a/packages/babel-parser/src/parser/statement.js
+++ b/packages/babel-parser/src/parser/statement.js
@@ -364,8 +364,18 @@ export default class StatementParser extends ExpressionParser {
   parseDoStatement(node: N.DoWhileStatement): N.DoWhileStatement {
     this.next();
     this.state.labels.push(loopLabel);
-    node.body = this.parseStatement(false);
+
+    node.body =
+      // For the smartPipelines plugin: Disable topic references from outer
+      // contexts within the loop body. They are permitted in test expressions,
+      // outside of the loop body.
+      this.withTopicForbiddingContext(() =>
+        // Parse the loop body's body.
+        this.parseStatement(false),
+      );
+
     this.state.labels.pop();
+
     this.expect(tt._while);
     node.test = this.parseParenExpression();
     this.eat(tt.semi);
@@ -554,7 +564,17 @@ export default class StatementParser extends ExpressionParser {
         this.expectPlugin("optionalCatchBinding");
         clause.param = null;
       }
-      clause.body = this.parseBlock();
+
+      clause.body =
+        // For the smartPipelines plugin: Disable topic references from outer
+        // contexts within the function body. They are permitted in function
+        // default-parameter expressions, which are part of the outer context,
+        // outside of the function body.
+        this.withTopicForbiddingContext(() =>
+          // Parse the catch clause's body.
+          this.parseBlock(false),
+        );
+
       node.handler = this.finishNode(clause, "CatchClause");
     }
 
@@ -582,8 +602,18 @@ export default class StatementParser extends ExpressionParser {
     this.next();
     node.test = this.parseParenExpression();
     this.state.labels.push(loopLabel);
-    node.body = this.parseStatement(false);
+
+    node.body =
+      // For the smartPipelines plugin:
+      // Disable topic references from outer contexts within the loop body.
+      // They are permitted in test expressions, outside of the loop body.
+      this.withTopicForbiddingContext(() =>
+        // Parse loop body.
+        this.parseStatement(false),
+      );
+
     this.state.labels.pop();
+
     return this.finishNode(node, "WhileStatement");
   }
 
@@ -593,7 +623,17 @@ export default class StatementParser extends ExpressionParser {
     }
     this.next();
     node.object = this.parseParenExpression();
-    node.body = this.parseStatement(false);
+
+    node.body =
+      // For the smartPipelines plugin:
+      // Disable topic references from outer contexts within the function body.
+      // They are permitted in function default-parameter expressions, which are
+      // part of the outer context, outside of the function body.
+      this.withTopicForbiddingContext(() =>
+        // Parse the statement body.
+        this.parseStatement(false),
+      );
+
     return this.finishNode(node, "WithStatement");
   }
 
@@ -750,8 +790,18 @@ export default class StatementParser extends ExpressionParser {
     this.expect(tt.semi);
     node.update = this.match(tt.parenR) ? null : this.parseExpression();
     this.expect(tt.parenR);
-    node.body = this.parseStatement(false);
+
+    node.body =
+      // For the smartPipelines plugin: Disable topic references from outer
+      // contexts within the loop body. They are permitted in test expressions,
+      // outside of the loop body.
+      this.withTopicForbiddingContext(() =>
+        // Parse the loop body.
+        this.parseStatement(false),
+      );
+
     this.state.labels.pop();
+
     return this.finishNode(node, "ForStatement");
   }
 
@@ -775,8 +825,18 @@ export default class StatementParser extends ExpressionParser {
     node.left = init;
     node.right = this.parseExpression();
     this.expect(tt.parenR);
-    node.body = this.parseStatement(false);
+
+    node.body =
+      // For the smartPipelines plugin:
+      // Disable topic references from outer contexts within the loop body.
+      // They are permitted in test expressions, outside of the loop body.
+      this.withTopicForbiddingContext(() =>
+        // Parse loop body.
+        this.parseStatement(false),
+      );
+
     this.state.labels.pop();
+
     return this.finishNode(node, type);
   }
 
@@ -879,11 +939,18 @@ export default class StatementParser extends ExpressionParser {
     if (isStatement) this.state.inGenerator = node.generator;
 
     this.parseFunctionParams(node);
-    this.parseFunctionBodyAndFinish(
-      node,
-      isStatement ? "FunctionDeclaration" : "FunctionExpression",
-      allowExpressionBody,
-    );
+
+    // For the smartPipelines plugin: Disable topic references from outer
+    // contexts within the function body. They are permitted in test
+    // expressions, outside of the function body.
+    this.withTopicForbiddingContext(() => {
+      // Parse the function body.
+      this.parseFunctionBodyAndFinish(
+        node,
+        isStatement ? "FunctionDeclaration" : "FunctionExpression",
+        allowExpressionBody,
+      );
+    });
 
     this.state.inFunction = oldInFunc;
     this.state.inMethod = oldInMethod;
@@ -957,44 +1024,49 @@ export default class StatementParser extends ExpressionParser {
 
     this.expect(tt.braceL);
 
-    while (!this.eat(tt.braceR)) {
-      if (this.eat(tt.semi)) {
-        if (decorators.length > 0) {
-          this.raise(
-            this.state.lastTokEnd,
-            "Decorators must not be followed by a semicolon",
-          );
+    // For the smartPipelines plugin: Disable topic references from outer
+    // contexts within the class body. They are permitted in test expressions,
+    // outside of the class body.
+    this.withTopicForbiddingContext(() => {
+      while (!this.eat(tt.braceR)) {
+        if (this.eat(tt.semi)) {
+          if (decorators.length > 0) {
+            this.raise(
+              this.state.lastTokEnd,
+              "Decorators must not be followed by a semicolon",
+            );
+          }
+          continue;
         }
-        continue;
-      }
 
-      if (this.match(tt.at)) {
-        decorators.push(this.parseDecorator());
-        continue;
-      }
+        if (this.match(tt.at)) {
+          decorators.push(this.parseDecorator());
+          continue;
+        }
 
-      const member = this.startNode();
+        const member = this.startNode();
 
-      // steal the decorators if there are any
-      if (decorators.length) {
-        member.decorators = decorators;
-        this.resetStartLocationFromNode(member, decorators[0]);
-        decorators = [];
-      }
+        // steal the decorators if there are any
+        if (decorators.length) {
+          member.decorators = decorators;
+          this.resetStartLocationFromNode(member, decorators[0]);
+          decorators = [];
+        }
 
-      this.parseClassMember(classBody, member, state);
+        this.parseClassMember(classBody, member, state);
 
-      if (
-        member.kind === "constructor" &&
-        member.decorators &&
-        member.decorators.length > 0
-      ) {
-        this.raise(
-          member.start,
-          "Decorators can't be used with a constructor. Did you mean '@dec class { ... }'?",
-        );
+        if (
+          member.kind === "constructor" &&
+          member.decorators &&
+          member.decorators.length > 0
+        ) {
+          this.raise(
+            member.start,
+            "Decorators can't be used with a constructor. Did you mean '@dec class { ... }'?",
+          );
+        }
       }
-    }
+    });
 
     if (decorators.length) {
       this.raise(
diff --git a/packages/babel-parser/src/tokenizer/index.js b/packages/babel-parser/src/tokenizer/index.js
index a5655cadb465..658760c32e61 100644
--- a/packages/babel-parser/src/tokenizer/index.js
+++ b/packages/babel-parser/src/tokenizer/index.js
@@ -404,6 +404,43 @@ export default class Tokenizer extends LocationParser {
   //
   // All in the name of speed.
   //
+  readToken_numberSign(code: number): void {
+    if (this.state.pos === 0 && this.readToken_interpreter()) {
+      return;
+    }
+
+    const nextPos = this.state.pos + 1;
+    const next = this.input.charCodeAt(nextPos);
+    // if (isIdentifierStart(next)) {
+    if (
+      (this.hasPlugin("classPrivateProperties") ||
+        this.hasPlugin("classPrivateMethods")) &&
+      this.state.classLevel > 0
+    ) {
+      ++this.state.pos;
+      this.finishToken(tt.hash);
+      return;
+    } else if (
+      "smart" === this.getPluginOption("pipelineOperator", "proposal")
+    ) {
+      if (next >= charCodes.digit0 && next <= charCodes.digit9) {
+        this.raise(
+          this.state.pos,
+          `Unexpected digit after topic reference: '#${String.fromCodePoint(
+            next,
+          )}'`,
+        );
+      } else {
+        this.finishOp(tt.primaryTopicReference, 1);
+      }
+    } else {
+      this.raise(
+        this.state.pos,
+        `Unexpected character '${codePointToString(code)}'`,
+      );
+    }
+  }
+
   readToken_dot(): void {
     const next = this.input.charCodeAt(this.state.pos + 1);
     if (next >= charCodes.digit0 && next <= charCodes.digit9) {
@@ -651,25 +688,12 @@ export default class Tokenizer extends LocationParser {
 
   getTokenFromCode(code: number): void {
     switch (code) {
-      case charCodes.numberSign:
-        if (this.state.pos === 0 && this.readToken_interpreter()) {
-          return;
-        }
+      // The interpretation of a number sign "#" depends on whether it is
+      // followed by an identifier or not.
 
-        if (
-          (this.hasPlugin("classPrivateProperties") ||
-            this.hasPlugin("classPrivateMethods")) &&
-          this.state.classLevel > 0
-        ) {
-          ++this.state.pos;
-          this.finishToken(tt.hash);
-          return;
-        } else {
-          this.raise(
-            this.state.pos,
-            `Unexpected character '${codePointToString(code)}'`,
-          );
-        }
+      case charCodes.numberSign:
+        this.readToken_numberSign(code);
+        return;
 
       // The interpretation of a dot depends on whether it is followed
       // by a digit or another two dots.
diff --git a/packages/babel-parser/src/tokenizer/state.js b/packages/babel-parser/src/tokenizer/state.js
index 364ceec96d32..536d81592434 100644
--- a/packages/babel-parser/src/tokenizer/state.js
+++ b/packages/babel-parser/src/tokenizer/state.js
@@ -33,6 +33,12 @@ export default class State {
     this.hasFlowComment = false;
     this.isIterator = false;
 
+    // Used by smartPipelines.
+    this.topicContextState = {
+      maxNumOfResolvableTopics: 0,
+      maxTopicIndex: undefined,
+    };
+
     this.classLevel = 0;
 
     this.labels = [];
@@ -111,6 +117,9 @@ export default class State {
   hasFlowComment: boolean;
   isIterator: boolean;
 
+  // For the smartPipelines plugin:
+  topicContextState: tt.TopicContextState;
+
   // Check whether we are in a (nested) class or not.
   classLevel: number;
 
diff --git a/packages/babel-parser/src/tokenizer/types.js b/packages/babel-parser/src/tokenizer/types.js
index 050ca6c82065..1142a47f2446 100644
--- a/packages/babel-parser/src/tokenizer/types.js
+++ b/packages/babel-parser/src/tokenizer/types.js
@@ -86,6 +86,7 @@ export const types: { [name: string]: TokenType } = {
   regexp: new TokenType("regexp", { startsExpr }),
   string: new TokenType("string", { startsExpr }),
   name: new TokenType("name", { startsExpr }),
+  primaryTopicReference: new TokenType("#", { startsExpr }),
   eof: new TokenType("eof"),
 
   // Punctuation token types.
@@ -199,3 +200,17 @@ export const keywords = {
 Object.keys(keywords).forEach(name => {
   types["_" + name] = keywords[name];
 });
+
+// A type for the smartPipelines plugin.
+export type TopicContextState = {
+  // When a topic binding has been currently established,
+  // then this is 1. Otherwise, it is 0. This is forwards compatible
+  // with a future plugin for multiple lexical topics.
+  maxNumOfResolvableTopics: number,
+
+  // When a topic binding has been currently established, and if that binding
+  // has been used as a topic reference `#`, then this is 0. Otherwise, it is
+  // `null`. This is forwards compatible with a future plugin for multiple
+  // lexical topics.
+  maxTopicIndex: null | 0,
+};
diff --git a/packages/babel-parser/src/types.js b/packages/babel-parser/src/types.js
index 0a7d2d0f5271..7524c232b256 100644
--- a/packages/babel-parser/src/types.js
+++ b/packages/babel-parser/src/types.js
@@ -565,6 +565,32 @@ export type SequenceExpression = NodeBase & {
   expressions: $ReadOnlyArray<Expression>,
 };
 
+// Pipelines
+
+export type PipelineBody = NodeBase & {
+  type: "PipelineBody",
+};
+
+export type PipelineBareFunctionBody = PipelineBody & {
+  type: "PipelineBareFunctionBody",
+  callee: Expression,
+};
+
+export type PipelineBareConstructorBody = PipelineBody & {
+  type: "PipelineBareConstructorBody",
+  callee: Expression,
+};
+
+export type PipelineBareAwaitedFunctionBody = PipelineBody & {
+  type: "PipelineBareAwaitedFunctionBody",
+  callee: Expression,
+};
+
+export type PipelineTopicBody = PipelineBody & {
+  type: "PipelineTopicBody",
+  expression: Expression,
+};
+
 // Template Literals
 
 export type TemplateLiteral = NodeBase & {
diff --git a/packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/with-pipeline/options.json b/packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/with-pipeline/options.json
index 37fbfac05f2a..790c3f234b5c 100644
--- a/packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/with-pipeline/options.json
+++ b/packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/with-pipeline/options.json
@@ -1,4 +1,6 @@
 {
-  "plugins": ["nullishCoalescingOperator", "pipelineOperator"]
+  "plugins": [
+    "nullishCoalescingOperator",
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
 }
-  
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/arrow-requires-parens-with-parend-args/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/arrow-requires-parens-with-parend-args/options.json
deleted file mode 100644
index 120167aad9cf..000000000000
--- a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/arrow-requires-parens-with-parend-args/options.json
+++ /dev/null
@@ -1,4 +0,0 @@
-{
-  "plugins": ["pipelineOperator"],
-  "throws": "Unexpected token, expected \";\" (1:10)"
-}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/arrow-requires-parens/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/arrow-requires-parens/options.json
deleted file mode 100644
index 6f196466a493..000000000000
--- a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/arrow-requires-parens/options.json
+++ /dev/null
@@ -1,4 +0,0 @@
-{
-  "plugins": ["pipelineOperator"],
-  "throws": "Unexpected token, expected \";\" (1:8)"
-}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/await-requires-parens/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/await-requires-parens/options.json
deleted file mode 100644
index 599d48a46961..000000000000
--- a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/await-requires-parens/options.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "plugins": ["pipelineOperator"]
-}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/base/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/base/options.json
deleted file mode 100644
index 599d48a46961..000000000000
--- a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/base/options.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "plugins": ["pipelineOperator"]
-}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/chain/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/chain/options.json
deleted file mode 100644
index 599d48a46961..000000000000
--- a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/chain/options.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "plugins": ["pipelineOperator"]
-}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/base/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/invalid-proposal/input.js
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/base/input.js
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/invalid-proposal/input.js
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/invalid-proposal/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/invalid-proposal/options.json
new file mode 100644
index 000000000000..9b75bedf3622
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/invalid-proposal/options.json
@@ -0,0 +1,6 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "invalid" }]
+  ],
+  "throws": "'pipelineOperator' requires 'proposal' option whose value should be one of: minimal, smart (1:0)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/multiline/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/multiline/options.json
deleted file mode 100644
index 599d48a46961..000000000000
--- a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/multiline/options.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "plugins": ["pipelineOperator"]
-}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/precedence/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/precedence/options.json
deleted file mode 100644
index 599d48a46961..000000000000
--- a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/precedence/options.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "plugins": ["pipelineOperator"]
-}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/arrow-requires-parens-with-parend-args/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-arrow-requires-parens-with-parend-args/input.js
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/arrow-requires-parens-with-parend-args/input.js
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-arrow-requires-parens-with-parend-args/input.js
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-arrow-requires-parens-with-parend-args/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-arrow-requires-parens-with-parend-args/options.json
new file mode 100644
index 000000000000..b4e236359dd1
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-arrow-requires-parens-with-parend-args/options.json
@@ -0,0 +1,6 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ],
+  "throws": "Unexpected token, expected \";\" (1:10)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/arrow-requires-parens/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-arrow-requires-parens/input.js
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/arrow-requires-parens/input.js
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-arrow-requires-parens/input.js
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-arrow-requires-parens/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-arrow-requires-parens/options.json
new file mode 100644
index 000000000000..551ef0ba6c76
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-arrow-requires-parens/options.json
@@ -0,0 +1,6 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ],
+  "throws": "Unexpected token, expected \";\" (1:8)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/await-requires-parens/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-await-requires-parens/input.js
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/await-requires-parens/input.js
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-await-requires-parens/input.js
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-await-requires-parens/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-await-requires-parens/options.json
new file mode 100644
index 000000000000..f96a57c74821
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-await-requires-parens/options.json
@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/await-requires-parens/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-await-requires-parens/output.json
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/await-requires-parens/output.json
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-await-requires-parens/output.json
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/ban-await-f/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-ban-await-f/input.js
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/ban-await-f/input.js
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-ban-await-f/input.js
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/ban-await/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-ban-await-f/options.json
similarity index 61%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/ban-await/options.json
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-ban-await-f/options.json
index d964de6b4d2b..126164b9ee52 100644
--- a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/ban-await/options.json
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-ban-await-f/options.json
@@ -1,4 +1,6 @@
 {
-  "plugins": ["pipelineOperator"],
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ],
   "throws": "Unexpected \"await\" after pipeline body; await must have parentheses in minimal proposal (2:14)"
 }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/ban-await/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-ban-await/input.js
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/ban-await/input.js
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-ban-await/input.js
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/ban-await-f/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-ban-await/options.json
similarity index 61%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/ban-await-f/options.json
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-ban-await/options.json
index d964de6b4d2b..126164b9ee52 100644
--- a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/ban-await-f/options.json
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-ban-await/options.json
@@ -1,4 +1,6 @@
 {
-  "plugins": ["pipelineOperator"],
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ],
   "throws": "Unexpected \"await\" after pipeline body; await must have parentheses in minimal proposal (2:14)"
 }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-base/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-base/input.js
new file mode 100644
index 000000000000..cf3443941ff0
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-base/input.js
@@ -0,0 +1 @@
+a |> b
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-base/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-base/options.json
new file mode 100644
index 000000000000..f96a57c74821
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-base/options.json
@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/base/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-base/output.json
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/base/output.json
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-base/output.json
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/chain/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-chain/input.js
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/chain/input.js
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-chain/input.js
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-chain/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-chain/options.json
new file mode 100644
index 000000000000..f96a57c74821
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-chain/options.json
@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/chain/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-chain/output.json
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/chain/output.json
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-chain/output.json
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/multiline/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-multiline/input.js
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/multiline/input.js
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-multiline/input.js
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-multiline/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-multiline/options.json
new file mode 100644
index 000000000000..f96a57c74821
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-multiline/options.json
@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/multiline/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-multiline/output.json
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/multiline/output.json
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-multiline/output.json
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/precedence/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-precedence/input.js
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/precedence/input.js
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-precedence/input.js
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-precedence/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-precedence/options.json
new file mode 100644
index 000000000000..f96a57c74821
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-precedence/options.json
@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/precedence/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-precedence/output.json
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/precedence/output.json
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-precedence/output.json
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow-parend-params/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow-parend-params/input.js
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow-parend-params/input.js
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow-parend-params/input.js
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow-parend-params/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow-parend-params/options.json
new file mode 100644
index 000000000000..f96a57c74821
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow-parend-params/options.json
@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow-parend-params/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow-parend-params/output.json
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow-parend-params/output.json
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow-parend-params/output.json
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow/input.js
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow/input.js
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow/input.js
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow/options.json
new file mode 100644
index 000000000000..f96a57c74821
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow/options.json
@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow/output.json
similarity index 100%
rename from packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow/output.json
rename to packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow/output.json
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-multiline/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-multiline/input.js
new file mode 100644
index 000000000000..dfbeff94f212
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-multiline/input.js
@@ -0,0 +1,6 @@
+async function af () {
+  let result = "hello"
+  |> await doubleSay
+  |> await text.capitalize
+  |> await a.b.exclaim;
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-multiline/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-multiline/options.json
new file mode 100644
index 000000000000..8b9d7913160a
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-multiline/options.json
@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "smart" }]
+  ]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-multiline/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-multiline/output.json
new file mode 100644
index 000000000000..fd6424d6361a
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-multiline/output.json
@@ -0,0 +1,401 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 119,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 6,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 119,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 6,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "FunctionDeclaration",
+        "start": 0,
+        "end": 119,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 6,
+            "column": 1
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 15,
+          "end": 17,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 15
+            },
+            "end": {
+              "line": 1,
+              "column": 17
+            },
+            "identifierName": "af"
+          },
+          "name": "af"
+        },
+        "generator": false,
+        "async": true,
+        "params": [],
+        "body": {
+          "type": "BlockStatement",
+          "start": 21,
+          "end": 119,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 21
+            },
+            "end": {
+              "line": 6,
+              "column": 1
+            }
+          },
+          "body": [
+            {
+              "type": "VariableDeclaration",
+              "start": 25,
+              "end": 117,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 2
+                },
+                "end": {
+                  "line": 5,
+                  "column": 23
+                }
+              },
+              "declarations": [
+                {
+                  "type": "VariableDeclarator",
+                  "start": 29,
+                  "end": 116,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 6
+                    },
+                    "end": {
+                      "line": 5,
+                      "column": 22
+                    }
+                  },
+                  "id": {
+                    "type": "Identifier",
+                    "start": 29,
+                    "end": 35,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 6
+                      },
+                      "end": {
+                        "line": 2,
+                        "column": 12
+                      },
+                      "identifierName": "result"
+                    },
+                    "name": "result"
+                  },
+                  "init": {
+                    "type": "BinaryExpression",
+                    "start": 38,
+                    "end": 116,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 15
+                      },
+                      "end": {
+                        "line": 5,
+                        "column": 22
+                      }
+                    },
+                    "left": {
+                      "type": "BinaryExpression",
+                      "start": 38,
+                      "end": 93,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 15
+                        },
+                        "end": {
+                          "line": 4,
+                          "column": 26
+                        }
+                      },
+                      "left": {
+                        "type": "BinaryExpression",
+                        "start": 38,
+                        "end": 66,
+                        "loc": {
+                          "start": {
+                            "line": 2,
+                            "column": 15
+                          },
+                          "end": {
+                            "line": 3,
+                            "column": 20
+                          }
+                        },
+                        "left": {
+                          "type": "StringLiteral",
+                          "start": 38,
+                          "end": 45,
+                          "loc": {
+                            "start": {
+                              "line": 2,
+                              "column": 15
+                            },
+                            "end": {
+                              "line": 2,
+                              "column": 22
+                            }
+                          },
+                          "extra": {
+                            "rawValue": "hello",
+                            "raw": "\"hello\""
+                          },
+                          "value": "hello"
+                        },
+                        "operator": "|>",
+                        "right": {
+                          "type": "PipelineBareAwaitedFunction",
+                          "start": 51,
+                          "end": 66,
+                          "loc": {
+                            "start": {
+                              "line": 3,
+                              "column": 5
+                            },
+                            "end": {
+                              "line": 3,
+                              "column": 20
+                            }
+                          },
+                          "callee": {
+                            "type": "Identifier",
+                            "start": 57,
+                            "end": 66,
+                            "loc": {
+                              "start": {
+                                "line": 3,
+                                "column": 11
+                              },
+                              "end": {
+                                "line": 3,
+                                "column": 20
+                              },
+                              "identifierName": "doubleSay"
+                            },
+                            "name": "doubleSay"
+                          }
+                        }
+                      },
+                      "operator": "|>",
+                      "right": {
+                        "type": "PipelineBareAwaitedFunction",
+                        "start": 72,
+                        "end": 93,
+                        "loc": {
+                          "start": {
+                            "line": 4,
+                            "column": 5
+                          },
+                          "end": {
+                            "line": 4,
+                            "column": 26
+                          }
+                        },
+                        "callee": {
+                          "type": "MemberExpression",
+                          "start": 78,
+                          "end": 93,
+                          "loc": {
+                            "start": {
+                              "line": 4,
+                              "column": 11
+                            },
+                            "end": {
+                              "line": 4,
+                              "column": 26
+                            }
+                          },
+                          "object": {
+                            "type": "Identifier",
+                            "start": 78,
+                            "end": 82,
+                            "loc": {
+                              "start": {
+                                "line": 4,
+                                "column": 11
+                              },
+                              "end": {
+                                "line": 4,
+                                "column": 15
+                              },
+                              "identifierName": "text"
+                            },
+                            "name": "text"
+                          },
+                          "property": {
+                            "type": "Identifier",
+                            "start": 83,
+                            "end": 93,
+                            "loc": {
+                              "start": {
+                                "line": 4,
+                                "column": 16
+                              },
+                              "end": {
+                                "line": 4,
+                                "column": 26
+                              },
+                              "identifierName": "capitalize"
+                            },
+                            "name": "capitalize"
+                          },
+                          "computed": false
+                        }
+                      }
+                    },
+                    "operator": "|>",
+                    "right": {
+                      "type": "PipelineBareAwaitedFunction",
+                      "start": 99,
+                      "end": 116,
+                      "loc": {
+                        "start": {
+                          "line": 5,
+                          "column": 5
+                        },
+                        "end": {
+                          "line": 5,
+                          "column": 22
+                        }
+                      },
+                      "callee": {
+                        "type": "MemberExpression",
+                        "start": 105,
+                        "end": 116,
+                        "loc": {
+                          "start": {
+                            "line": 5,
+                            "column": 11
+                          },
+                          "end": {
+                            "line": 5,
+                            "column": 22
+                          }
+                        },
+                        "object": {
+                          "type": "MemberExpression",
+                          "start": 105,
+                          "end": 108,
+                          "loc": {
+                            "start": {
+                              "line": 5,
+                              "column": 11
+                            },
+                            "end": {
+                              "line": 5,
+                              "column": 14
+                            }
+                          },
+                          "object": {
+                            "type": "Identifier",
+                            "start": 105,
+                            "end": 106,
+                            "loc": {
+                              "start": {
+                                "line": 5,
+                                "column": 11
+                              },
+                              "end": {
+                                "line": 5,
+                                "column": 12
+                              },
+                              "identifierName": "a"
+                            },
+                            "name": "a"
+                          },
+                          "property": {
+                            "type": "Identifier",
+                            "start": 107,
+                            "end": 108,
+                            "loc": {
+                              "start": {
+                                "line": 5,
+                                "column": 13
+                              },
+                              "end": {
+                                "line": 5,
+                                "column": 14
+                              },
+                              "identifierName": "b"
+                            },
+                            "name": "b"
+                          },
+                          "computed": false
+                        },
+                        "property": {
+                          "type": "Identifier",
+                          "start": 109,
+                          "end": 116,
+                          "loc": {
+                            "start": {
+                              "line": 5,
+                              "column": 15
+                            },
+                            "end": {
+                              "line": 5,
+                              "column": 22
+                            },
+                            "identifierName": "exclaim"
+                          },
+                          "name": "exclaim"
+                        },
+                        "computed": false
+                      }
+                    }
+                  }
+                }
+              ],
+              "kind": "let"
+            }
+          ],
+          "directives": []
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-single-line/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-single-line/input.js
new file mode 100644
index 000000000000..a78a3ae84428
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-single-line/input.js
@@ -0,0 +1,3 @@
+async function af () {
+  x |> await number.inc |> await double;
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-single-line/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-single-line/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-single-line/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-single-line/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-single-line/output.json
new file mode 100644
index 000000000000..5e0aa503463d
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-chained,-single-line/output.json
@@ -0,0 +1,249 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 65,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 3,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 65,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 3,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "FunctionDeclaration",
+        "start": 0,
+        "end": 65,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 3,
+            "column": 1
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 15,
+          "end": 17,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 15
+            },
+            "end": {
+              "line": 1,
+              "column": 17
+            },
+            "identifierName": "af"
+          },
+          "name": "af"
+        },
+        "generator": false,
+        "async": true,
+        "params": [],
+        "body": {
+          "type": "BlockStatement",
+          "start": 21,
+          "end": 65,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 21
+            },
+            "end": {
+              "line": 3,
+              "column": 1
+            }
+          },
+          "body": [
+            {
+              "type": "ExpressionStatement",
+              "start": 25,
+              "end": 63,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 2
+                },
+                "end": {
+                  "line": 2,
+                  "column": 40
+                }
+              },
+              "expression": {
+                "type": "BinaryExpression",
+                "start": 25,
+                "end": 62,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 2
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 39
+                  }
+                },
+                "left": {
+                  "type": "BinaryExpression",
+                  "start": 25,
+                  "end": 46,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 2
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 23
+                    }
+                  },
+                  "left": {
+                    "type": "Identifier",
+                    "start": 25,
+                    "end": 26,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 2
+                      },
+                      "end": {
+                        "line": 2,
+                        "column": 3
+                      },
+                      "identifierName": "x"
+                    },
+                    "name": "x"
+                  },
+                  "operator": "|>",
+                  "right": {
+                    "type": "PipelineBareAwaitedFunction",
+                    "start": 30,
+                    "end": 46,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 7
+                      },
+                      "end": {
+                        "line": 2,
+                        "column": 23
+                      }
+                    },
+                    "callee": {
+                      "type": "MemberExpression",
+                      "start": 36,
+                      "end": 46,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 13
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 23
+                        }
+                      },
+                      "object": {
+                        "type": "Identifier",
+                        "start": 36,
+                        "end": 42,
+                        "loc": {
+                          "start": {
+                            "line": 2,
+                            "column": 13
+                          },
+                          "end": {
+                            "line": 2,
+                            "column": 19
+                          },
+                          "identifierName": "number"
+                        },
+                        "name": "number"
+                      },
+                      "property": {
+                        "type": "Identifier",
+                        "start": 43,
+                        "end": 46,
+                        "loc": {
+                          "start": {
+                            "line": 2,
+                            "column": 20
+                          },
+                          "end": {
+                            "line": 2,
+                            "column": 23
+                          },
+                          "identifierName": "inc"
+                        },
+                        "name": "inc"
+                      },
+                      "computed": false
+                    }
+                  }
+                },
+                "operator": "|>",
+                "right": {
+                  "type": "PipelineBareAwaitedFunction",
+                  "start": 50,
+                  "end": 62,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 27
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 39
+                    }
+                  },
+                  "callee": {
+                    "type": "Identifier",
+                    "start": 56,
+                    "end": 62,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 33
+                      },
+                      "end": {
+                        "line": 2,
+                        "column": 39
+                      },
+                      "identifierName": "double"
+                    },
+                    "name": "double"
+                  }
+                }
+              }
+            }
+          ],
+          "directives": []
+        }
+      }
+    ],
+    "directives": []
+  }
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-nested-property/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-nested-property/input.js
new file mode 100644
index 000000000000..c86dda49df36
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-nested-property/input.js
@@ -0,0 +1,3 @@
+async function af () {
+  value |> await a.b.f
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-nested-property/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-nested-property/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-nested-property/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-nested-property/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-nested-property/output.json
new file mode 100644
index 000000000000..aaf050332d53
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-nested-property/output.json
@@ -0,0 +1,234 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 47,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 3,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 47,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 3,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "FunctionDeclaration",
+        "start": 0,
+        "end": 47,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 3,
+            "column": 1
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 15,
+          "end": 17,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 15
+            },
+            "end": {
+              "line": 1,
+              "column": 17
+            },
+            "identifierName": "af"
+          },
+          "name": "af"
+        },
+        "generator": false,
+        "async": true,
+        "params": [],
+        "body": {
+          "type": "BlockStatement",
+          "start": 21,
+          "end": 47,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 21
+            },
+            "end": {
+              "line": 3,
+              "column": 1
+            }
+          },
+          "body": [
+            {
+              "type": "ExpressionStatement",
+              "start": 25,
+              "end": 45,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 2
+                },
+                "end": {
+                  "line": 2,
+                  "column": 22
+                }
+              },
+              "expression": {
+                "type": "BinaryExpression",
+                "start": 25,
+                "end": 45,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 2
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 22
+                  }
+                },
+                "left": {
+                  "type": "Identifier",
+                  "start": 25,
+                  "end": 30,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 2
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 7
+                    },
+                    "identifierName": "value"
+                  },
+                  "name": "value"
+                },
+                "operator": "|>",
+                "right": {
+                  "type": "PipelineBareAwaitedFunction",
+                  "start": 34,
+                  "end": 45,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 11
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 22
+                    }
+                  },
+                  "callee": {
+                    "type": "MemberExpression",
+                    "start": 40,
+                    "end": 45,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 17
+                      },
+                      "end": {
+                        "line": 2,
+                        "column": 22
+                      }
+                    },
+                    "object": {
+                      "type": "MemberExpression",
+                      "start": 40,
+                      "end": 43,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 17
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 20
+                        }
+                      },
+                      "object": {
+                        "type": "Identifier",
+                        "start": 40,
+                        "end": 41,
+                        "loc": {
+                          "start": {
+                            "line": 2,
+                            "column": 17
+                          },
+                          "end": {
+                            "line": 2,
+                            "column": 18
+                          },
+                          "identifierName": "a"
+                        },
+                        "name": "a"
+                      },
+                      "property": {
+                        "type": "Identifier",
+                        "start": 42,
+                        "end": 43,
+                        "loc": {
+                          "start": {
+                            "line": 2,
+                            "column": 19
+                          },
+                          "end": {
+                            "line": 2,
+                            "column": 20
+                          },
+                          "identifierName": "b"
+                        },
+                        "name": "b"
+                      },
+                      "computed": false
+                    },
+                    "property": {
+                      "type": "Identifier",
+                      "start": 44,
+                      "end": 45,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 21
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 22
+                        },
+                        "identifierName": "f"
+                      },
+                      "name": "f"
+                    },
+                    "computed": false
+                  }
+                }
+              }
+            }
+          ],
+          "directives": []
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-single-identifier/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-single-identifier/input.js
new file mode 100644
index 000000000000..ff9045bd7262
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-single-identifier/input.js
@@ -0,0 +1,3 @@
+async function af () {
+  value |> await f
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-single-identifier/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-single-identifier/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-single-identifier/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-single-identifier/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-single-identifier/output.json
new file mode 100644
index 000000000000..50b19d2d745b
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-awaited-function-calls,-single,-single-identifier/output.json
@@ -0,0 +1,168 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 43,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 3,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 43,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 3,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "FunctionDeclaration",
+        "start": 0,
+        "end": 43,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 3,
+            "column": 1
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 15,
+          "end": 17,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 15
+            },
+            "end": {
+              "line": 1,
+              "column": 17
+            },
+            "identifierName": "af"
+          },
+          "name": "af"
+        },
+        "generator": false,
+        "async": true,
+        "params": [],
+        "body": {
+          "type": "BlockStatement",
+          "start": 21,
+          "end": 43,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 21
+            },
+            "end": {
+              "line": 3,
+              "column": 1
+            }
+          },
+          "body": [
+            {
+              "type": "ExpressionStatement",
+              "start": 25,
+              "end": 41,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 2
+                },
+                "end": {
+                  "line": 2,
+                  "column": 18
+                }
+              },
+              "expression": {
+                "type": "BinaryExpression",
+                "start": 25,
+                "end": 41,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 2
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 18
+                  }
+                },
+                "left": {
+                  "type": "Identifier",
+                  "start": 25,
+                  "end": 30,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 2
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 7
+                    },
+                    "identifierName": "value"
+                  },
+                  "name": "value"
+                },
+                "operator": "|>",
+                "right": {
+                  "type": "PipelineBareAwaitedFunction",
+                  "start": 34,
+                  "end": 41,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 11
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 18
+                    }
+                  },
+                  "callee": {
+                    "type": "Identifier",
+                    "start": 40,
+                    "end": 41,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 17
+                      },
+                      "end": {
+                        "line": 2,
+                        "column": 18
+                      },
+                      "identifierName": "f"
+                    },
+                    "name": "f"
+                  }
+                }
+              }
+            }
+          ],
+          "directives": []
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-multiline/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-multiline/input.js
new file mode 100644
index 000000000000..07827f96fbcd
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-multiline/input.js
@@ -0,0 +1,4 @@
+let result = "hello"
+|> new DoubleSay
+|> new text.Capitalize
+|> new a.b.Exclaim;
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-multiline/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-multiline/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-multiline/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-multiline/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-multiline/output.json
new file mode 100644
index 000000000000..cdf86d3125da
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-multiline/output.json
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+                      "end": 71,
+                      "loc": {
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+                          "line": 4,
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+                        },
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+                      },
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+                      },
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+                    },
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+                  },
+                  "computed": false
+                }
+              }
+            }
+          }
+        ],
+        "kind": "let"
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-single-line-arrow-function/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-single-line-arrow-function/input.js
new file mode 100644
index 000000000000..39c48bad512f
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-single-line-arrow-function/input.js
@@ -0,0 +1 @@
+x => x |> new number.Inc |> new Double
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-single-line-arrow-function/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-single-line-arrow-function/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-single-line-arrow-function/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-single-line-arrow-function/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-single-line-arrow-function/output.json
new file mode 100644
index 000000000000..4b4a0fb6af89
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-chained,-single-line-arrow-function/output.json
@@ -0,0 +1,233 @@
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+  "end": 38,
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\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-identifier/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-identifier/input.js
new file mode 100644
index 000000000000..4a4ec7bcd357
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-identifier/input.js
@@ -0,0 +1 @@
+x => x |> new F
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-identifier/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-identifier/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-identifier/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-identifier/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-identifier/output.json
new file mode 100644
index 000000000000..1f6e4945bd06
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-identifier/output.json
@@ -0,0 +1,152 @@
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+              },
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+                "end": 15,
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+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 15
+                  },
+                  "identifierName": "F"
+                },
+                "name": "F"
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-property/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-property/input.js
new file mode 100644
index 000000000000..f6b0bd49964b
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-property/input.js
@@ -0,0 +1 @@
+x => x |> new a.F
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-property/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-property/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-property/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-property/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-property/output.json
new file mode 100644
index 000000000000..dc9bbf5eab44
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-constructor-calls,-single,-property/output.json
@@ -0,0 +1,185 @@
+{
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+          "async": false,
+          "params": [
+            {
+              "type": "Identifier",
+              "start": 0,
+              "end": 1,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 0
+                },
+                "end": {
+                  "line": 1,
+                  "column": 1
+                },
+                "identifierName": "x"
+              },
+              "name": "x"
+            }
+          ],
+          "body": {
+            "type": "BinaryExpression",
+            "start": 5,
+            "end": 17,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 5
+              },
+              "end": {
+                "line": 1,
+                "column": 17
+              }
+            },
+            "left": {
+              "type": "Identifier",
+              "start": 5,
+              "end": 6,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 5
+                },
+                "end": {
+                  "line": 1,
+                  "column": 6
+                },
+                "identifierName": "x"
+              },
+              "name": "x"
+            },
+            "operator": "|>",
+            "right": {
+              "type": "PipelineBareConstructor",
+              "start": 10,
+              "end": 17,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 10
+                },
+                "end": {
+                  "line": 1,
+                  "column": 17
+                }
+              },
+              "callee": {
+                "type": "MemberExpression",
+                "start": 14,
+                "end": 17,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 14
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 17
+                  }
+                },
+                "object": {
+                  "type": "Identifier",
+                  "start": 14,
+                  "end": 15,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 14
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 15
+                    },
+                    "identifierName": "a"
+                  },
+                  "name": "a"
+                },
+                "property": {
+                  "type": "Identifier",
+                  "start": 16,
+                  "end": 17,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 16
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 17
+                    },
+                    "identifierName": "F"
+                  },
+                  "name": "F"
+                },
+                "computed": false
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-multiline/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-multiline/input.js
new file mode 100644
index 000000000000..49a8129b058f
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-multiline/input.js
@@ -0,0 +1,4 @@
+let result = "hello"
+|> doubleSay
+|> text.capitalize
+|> a.b.exclaim;
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-multiline/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-multiline/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-multiline/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-multiline/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-multiline/output.json
new file mode 100644
index 000000000000..889bb7a69b62
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-multiline/output.json
@@ -0,0 +1,348 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 68,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 4,
+      "column": 15
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 68,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 4,
+        "column": 15
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 68,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 4,
+            "column": 15
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 67,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 4,
+                "column": 14
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 10,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 10
+                },
+                "identifierName": "result"
+              },
+              "name": "result"
+            },
+            "init": {
+              "type": "BinaryExpression",
+              "start": 13,
+              "end": 67,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 13
+                },
+                "end": {
+                  "line": 4,
+                  "column": 14
+                }
+              },
+              "left": {
+                "type": "BinaryExpression",
+                "start": 13,
+                "end": 52,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 13
+                  },
+                  "end": {
+                    "line": 3,
+                    "column": 18
+                  }
+                },
+                "left": {
+                  "type": "BinaryExpression",
+                  "start": 13,
+                  "end": 33,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 13
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 12
+                    }
+                  },
+                  "left": {
+                    "type": "StringLiteral",
+                    "start": 13,
+                    "end": 20,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 13
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 20
+                      }
+                    },
+                    "extra": {
+                      "rawValue": "hello",
+                      "raw": "\"hello\""
+                    },
+                    "value": "hello"
+                  },
+                  "operator": "|>",
+                  "right": {
+                    "type": "PipelineBareFunction",
+                    "start": 24,
+                    "end": 33,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 3
+                      },
+                      "end": {
+                        "line": 2,
+                        "column": 12
+                      }
+                    },
+                    "callee": {
+                      "type": "Identifier",
+                      "start": 24,
+                      "end": 33,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 3
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 12
+                        },
+                        "identifierName": "doubleSay"
+                      },
+                      "name": "doubleSay"
+                    }
+                  }
+                },
+                "operator": "|>",
+                "right": {
+                  "type": "PipelineBareFunction",
+                  "start": 37,
+                  "end": 52,
+                  "loc": {
+                    "start": {
+                      "line": 3,
+                      "column": 3
+                    },
+                    "end": {
+                      "line": 3,
+                      "column": 18
+                    }
+                  },
+                  "callee": {
+                    "type": "MemberExpression",
+                    "start": 37,
+                    "end": 52,
+                    "loc": {
+                      "start": {
+                        "line": 3,
+                        "column": 3
+                      },
+                      "end": {
+                        "line": 3,
+                        "column": 18
+                      }
+                    },
+                    "object": {
+                      "type": "Identifier",
+                      "start": 37,
+                      "end": 41,
+                      "loc": {
+                        "start": {
+                          "line": 3,
+                          "column": 3
+                        },
+                        "end": {
+                          "line": 3,
+                          "column": 7
+                        },
+                        "identifierName": "text"
+                      },
+                      "name": "text"
+                    },
+                    "property": {
+                      "type": "Identifier",
+                      "start": 42,
+                      "end": 52,
+                      "loc": {
+                        "start": {
+                          "line": 3,
+                          "column": 8
+                        },
+                        "end": {
+                          "line": 3,
+                          "column": 18
+                        },
+                        "identifierName": "capitalize"
+                      },
+                      "name": "capitalize"
+                    },
+                    "computed": false
+                  }
+                }
+              },
+              "operator": "|>",
+              "right": {
+                "type": "PipelineBareFunction",
+                "start": 56,
+                "end": 67,
+                "loc": {
+                  "start": {
+                    "line": 4,
+                    "column": 3
+                  },
+                  "end": {
+                    "line": 4,
+                    "column": 14
+                  }
+                },
+                "callee": {
+                  "type": "MemberExpression",
+                  "start": 56,
+                  "end": 67,
+                  "loc": {
+                    "start": {
+                      "line": 4,
+                      "column": 3
+                    },
+                    "end": {
+                      "line": 4,
+                      "column": 14
+                    }
+                  },
+                  "object": {
+                    "type": "MemberExpression",
+                    "start": 56,
+                    "end": 59,
+                    "loc": {
+                      "start": {
+                        "line": 4,
+                        "column": 3
+                      },
+                      "end": {
+                        "line": 4,
+                        "column": 6
+                      }
+                    },
+                    "object": {
+                      "type": "Identifier",
+                      "start": 56,
+                      "end": 57,
+                      "loc": {
+                        "start": {
+                          "line": 4,
+                          "column": 3
+                        },
+                        "end": {
+                          "line": 4,
+                          "column": 4
+                        },
+                        "identifierName": "a"
+                      },
+                      "name": "a"
+                    },
+                    "property": {
+                      "type": "Identifier",
+                      "start": 58,
+                      "end": 59,
+                      "loc": {
+                        "start": {
+                          "line": 4,
+                          "column": 5
+                        },
+                        "end": {
+                          "line": 4,
+                          "column": 6
+                        },
+                        "identifierName": "b"
+                      },
+                      "name": "b"
+                    },
+                    "computed": false
+                  },
+                  "property": {
+                    "type": "Identifier",
+                    "start": 60,
+                    "end": 67,
+                    "loc": {
+                      "start": {
+                        "line": 4,
+                        "column": 7
+                      },
+                      "end": {
+                        "line": 4,
+                        "column": 14
+                      },
+                      "identifierName": "exclaim"
+                    },
+                    "name": "exclaim"
+                  },
+                  "computed": false
+                }
+              }
+            }
+          }
+        ],
+        "kind": "let"
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-single-line-arrow-function/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-single-line-arrow-function/input.js
new file mode 100644
index 000000000000..253a8fdfddf9
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-single-line-arrow-function/input.js
@@ -0,0 +1 @@
+x => x |> number.inc |> double
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-single-line-arrow-function/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-single-line-arrow-function/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-single-line-arrow-function/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-single-line-arrow-function/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-single-line-arrow-function/output.json
new file mode 100644
index 000000000000..71953d9db9ce
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-chained,-single-line-arrow-function/output.json
@@ -0,0 +1,233 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 30,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 30
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 30,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 30
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 30,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 30
+          }
+        },
+        "expression": {
+          "type": "ArrowFunctionExpression",
+          "start": 0,
+          "end": 30,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 30
+            }
+          },
+          "id": null,
+          "generator": false,
+          "async": false,
+          "params": [
+            {
+              "type": "Identifier",
+              "start": 0,
+              "end": 1,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 0
+                },
+                "end": {
+                  "line": 1,
+                  "column": 1
+                },
+                "identifierName": "x"
+              },
+              "name": "x"
+            }
+          ],
+          "body": {
+            "type": "BinaryExpression",
+            "start": 5,
+            "end": 30,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 5
+              },
+              "end": {
+                "line": 1,
+                "column": 30
+              }
+            },
+            "left": {
+              "type": "BinaryExpression",
+              "start": 5,
+              "end": 20,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 5
+                },
+                "end": {
+                  "line": 1,
+                  "column": 20
+                }
+              },
+              "left": {
+                "type": "Identifier",
+                "start": 5,
+                "end": 6,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 6
+                  },
+                  "identifierName": "x"
+                },
+                "name": "x"
+              },
+              "operator": "|>",
+              "right": {
+                "type": "PipelineBareFunction",
+                "start": 10,
+                "end": 20,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 10
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 20
+                  }
+                },
+                "callee": {
+                  "type": "MemberExpression",
+                  "start": 10,
+                  "end": 20,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 10
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 20
+                    }
+                  },
+                  "object": {
+                    "type": "Identifier",
+                    "start": 10,
+                    "end": 16,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 10
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 16
+                      },
+                      "identifierName": "number"
+                    },
+                    "name": "number"
+                  },
+                  "property": {
+                    "type": "Identifier",
+                    "start": 17,
+                    "end": 20,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 17
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 20
+                      },
+                      "identifierName": "inc"
+                    },
+                    "name": "inc"
+                  },
+                  "computed": false
+                }
+              }
+            },
+            "operator": "|>",
+            "right": {
+              "type": "PipelineBareFunction",
+              "start": 24,
+              "end": 30,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 24
+                },
+                "end": {
+                  "line": 1,
+                  "column": 30
+                }
+              },
+              "callee": {
+                "type": "Identifier",
+                "start": 24,
+                "end": 30,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 24
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 30
+                  },
+                  "identifierName": "double"
+                },
+                "name": "double"
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-identifier/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-identifier/input.js
new file mode 100644
index 000000000000..15a3d7657b9c
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-identifier/input.js
@@ -0,0 +1 @@
+value |> f
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-identifier/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-identifier/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-identifier/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-identifier/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-identifier/output.json
new file mode 100644
index 000000000000..0aef90100fb5
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-identifier/output.json
@@ -0,0 +1,115 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 10,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 10
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 10,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 10
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 10,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 10
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 10,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 10
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineBareFunction",
+            "start": 9,
+            "end": 10,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 1,
+                "column": 10
+              }
+            },
+            "callee": {
+              "type": "Identifier",
+              "start": 9,
+              "end": 10,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 10
+                },
+                "identifierName": "f"
+              },
+              "name": "f"
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-property/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-property/input.js
new file mode 100644
index 000000000000..9f9ac30d8f48
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-property/input.js
@@ -0,0 +1 @@
+value |> a.b.c.f
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-property/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-property/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-property/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-property/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-property/output.json
new file mode 100644
index 000000000000..0fbd40308b71
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-bare-style,-function-calls,-single,-property/output.json
@@ -0,0 +1,214 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 16,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 16
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 16,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 16
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 16,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 16
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 16,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 16
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineBareFunction",
+            "start": 9,
+            "end": 16,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 1,
+                "column": 16
+              }
+            },
+            "callee": {
+              "type": "MemberExpression",
+              "start": 9,
+              "end": 16,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 16
+                }
+              },
+              "object": {
+                "type": "MemberExpression",
+                "start": 9,
+                "end": 14,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 9
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 14
+                  }
+                },
+                "object": {
+                  "type": "MemberExpression",
+                  "start": 9,
+                  "end": 12,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 9
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 12
+                    }
+                  },
+                  "object": {
+                    "type": "Identifier",
+                    "start": 9,
+                    "end": 10,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 9
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 10
+                      },
+                      "identifierName": "a"
+                    },
+                    "name": "a"
+                  },
+                  "property": {
+                    "type": "Identifier",
+                    "start": 11,
+                    "end": 12,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 11
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 12
+                      },
+                      "identifierName": "b"
+                    },
+                    "name": "b"
+                  },
+                  "computed": false
+                },
+                "property": {
+                  "type": "Identifier",
+                  "start": 13,
+                  "end": 14,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 13
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 14
+                    },
+                    "identifierName": "c"
+                  },
+                  "name": "c"
+                },
+                "computed": false
+              },
+              "property": {
+                "type": "Identifier",
+                "start": 15,
+                "end": 16,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 15
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 16
+                  },
+                  "identifierName": "f"
+                },
+                "name": "f"
+              },
+              "computed": false
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-bare-style,-head-with-topic-reference-pair/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-bare-style,-head-with-topic-reference-pair/input.js
new file mode 100644
index 000000000000..a93aa77bbd74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-bare-style,-head-with-topic-reference-pair/input.js
@@ -0,0 +1 @@
+(1, 2) |> f;
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-bare-style,-head-with-topic-reference-pair/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-bare-style,-head-with-topic-reference-pair/options.json
new file mode 100644
index 000000000000..c785202f2a0c
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-bare-style,-head-with-topic-reference-pair/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Pipeline head may not be a comma-separated sequence expression (1:0)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-invalid-hash-token,-followed-by-digit/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-invalid-hash-token,-followed-by-digit/input.js
new file mode 100644
index 000000000000..b18a6404b537
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-invalid-hash-token,-followed-by-digit/input.js
@@ -0,0 +1 @@
+x |> #42;
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-invalid-hash-token,-followed-by-digit/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-invalid-hash-token,-followed-by-digit/options.json
new file mode 100644
index 000000000000..6d423c8c9d96
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-invalid-hash-token,-followed-by-digit/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Unexpected digit after topic reference: '#4' (1:5)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-bare-style,-no-outer-topic-reference/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-bare-style,-no-outer-topic-reference/input.js
new file mode 100644
index 000000000000..194b4e64ed1f
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-bare-style,-no-outer-topic-reference/input.js
@@ -0,0 +1 @@
+x |> ($ => $ |> f)
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-bare-style,-no-outer-topic-reference/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-bare-style,-no-outer-topic-reference/options.json
new file mode 100644
index 000000000000..d2b32f77521a
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-bare-style,-no-outer-topic-reference/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Pipeline is in topic style but does not use topic reference (1:5)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-inner-topic-reference/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-inner-topic-reference/input.js
new file mode 100644
index 000000000000..98e99a4493f1
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-inner-topic-reference/input.js
@@ -0,0 +1 @@
+x |> ($ => # |> $ + 1)
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-inner-topic-reference/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-inner-topic-reference/options.json
new file mode 100644
index 000000000000..e9eab6b46fe9
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-inner-topic-reference/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Pipeline is in topic style but does not use topic reference (1:16)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-outer-topic-reference/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-outer-topic-reference/input.js
new file mode 100644
index 000000000000..a4723737f3b5
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-outer-topic-reference/input.js
@@ -0,0 +1 @@
+x |> ($ => $ |> #)
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-outer-topic-reference/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-outer-topic-reference/options.json
new file mode 100644
index 000000000000..d2b32f77521a
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-arrow-function-with-topic-style,-no-outer-topic-reference/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Pipeline is in topic style but does not use topic reference (1:5)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-inner-topic-reference/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-inner-topic-reference/input.js
new file mode 100644
index 000000000000..50b90bb9adf9
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-inner-topic-reference/input.js
@@ -0,0 +1 @@
+x |> (# |> f())
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-inner-topic-reference/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-inner-topic-reference/options.json
new file mode 100644
index 000000000000..bdf0547df8f9
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-inner-topic-reference/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Pipeline is in topic style but does not use topic reference (1:11)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-outer-topic-reference/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-outer-topic-reference/input.js
new file mode 100644
index 000000000000..9d00837048ed
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-outer-topic-reference/input.js
@@ -0,0 +1 @@
+x |> ($ |> f)
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-outer-topic-reference/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-outer-topic-reference/options.json
new file mode 100644
index 000000000000..d2b32f77521a
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-nested-pipelines,-topic-style-with-inner-topic-style,-no-outer-topic-reference/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Pipeline is in topic style but does not use topic reference (1:5)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-followed-by-bare-style-pipeline-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-followed-by-bare-style-pipeline-body/input.js
new file mode 100644
index 000000000000..a6146afadab6
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-followed-by-bare-style-pipeline-body/input.js
@@ -0,0 +1 @@
+10 |> (#, #) |> h;
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-followed-by-bare-style-pipeline-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-followed-by-bare-style-pipeline-body/options.json
new file mode 100644
index 000000000000..fe3873ecc67f
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-followed-by-bare-style-pipeline-body/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Pipeline body may not be a comma-separated sequence expression (1:6)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-then-end/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-then-end/input.js
new file mode 100644
index 000000000000..7da42e013c11
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-then-end/input.js
@@ -0,0 +1 @@
+10 |> (#, #);
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-then-end/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-then-end/options.json
new file mode 100644
index 000000000000..fe3873ecc67f
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-sequence-style,-body-with-topic-reference-pair-then-end/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Pipeline body may not be a comma-separated sequence expression (1:6)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-addition/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-addition/input.js
new file mode 100644
index 000000000000..e952adac15fd
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-addition/input.js
@@ -0,0 +1 @@
+value |> a + b
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-addition/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-addition/options.json
new file mode 100644
index 000000000000..7a4451381c91
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-addition/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Pipeline is in topic style but does not use topic reference (1:9)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-class-expression/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-class-expression/input.js
new file mode 100644
index 000000000000..6ccb6ca13351
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-class-expression/input.js
@@ -0,0 +1 @@
+value |> class { }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-class-expression/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-class-expression/options.json
new file mode 100644
index 000000000000..7a4451381c91
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-class-expression/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Pipeline is in topic style but does not use topic reference (1:9)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-function-expression/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-function-expression/input.js
new file mode 100644
index 000000000000..faf09879d637
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-function-expression/input.js
@@ -0,0 +1 @@
+value |> function (x) { return; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-function-expression/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-function-expression/options.json
new file mode 100644
index 000000000000..7a4451381c91
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-no-topic-reference,-function-expression/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Pipeline is in topic style but does not use topic reference (1:9)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-body/input.js
new file mode 100644
index 000000000000..c1005576b7d5
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-body/input.js
@@ -0,0 +1 @@
+value |> do { do x += # while (x < 50); }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-body/options.json
new file mode 100644
index 000000000000..3b7a52d71cf7
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-body/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"],
+  "throws": "Topic reference was used in a lexical context without topic binding (1:22)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-body/input.js
new file mode 100644
index 000000000000..261f95e4c7d2
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-body/input.js
@@ -0,0 +1,3 @@
+async function af () {
+  value |> do { for await (const e of sequence) #; }
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-body/options.json
new file mode 100644
index 000000000000..d4a1b64b4575
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-body/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions", "asyncGenerators"],
+  "throws": "Topic reference was used in a lexical context without topic binding (2:48)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-body/input.js
new file mode 100644
index 000000000000..e0eb815c73fb
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-body/input.js
@@ -0,0 +1 @@
+value |> do { for (let i = 0; i < n; i += 1) #; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-body/options.json
new file mode 100644
index 000000000000..35e8658a93da
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-body/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"],
+  "throws": "Topic reference was used in a lexical context without topic binding (1:45)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-body/input.js
new file mode 100644
index 000000000000..f6ebfaf94818
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-body/input.js
@@ -0,0 +1 @@
+value |> do { for (e in object) #; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-body/options.json
new file mode 100644
index 000000000000..6e8b4a6f0d95
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-body/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"],
+  "throws": "Topic reference was used in a lexical context without topic binding (1:32)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-body/input.js
new file mode 100644
index 000000000000..b3350a5ad5e0
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-body/input.js
@@ -0,0 +1 @@
+value |> do { for (e of sequence) #; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-body/options.json
new file mode 100644
index 000000000000..a3707cc91710
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-body/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"],
+  "throws": "Topic reference was used in a lexical context without topic binding (1:34)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-try-statement,-outer-topic-reference-in-catch-clause/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-try-statement,-outer-topic-reference-in-catch-clause/input.js
new file mode 100644
index 000000000000..bd64c4dd8768
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-try-statement,-outer-topic-reference-in-catch-clause/input.js
@@ -0,0 +1,4 @@
+value |> do {
+  try { JSON.parse(#); }
+  catch (error) { console.error(#); }
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-try-statement,-outer-topic-reference-in-catch-clause/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-try-statement,-outer-topic-reference-in-catch-clause/options.json
new file mode 100644
index 000000000000..0f40a90d2204
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-try-statement,-outer-topic-reference-in-catch-clause/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"],
+  "throws": "Topic reference was used in a lexical context without topic binding (3:32)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-while-loop,-outer-topic-reference-in-loop-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-while-loop,-outer-topic-reference-in-loop-body/input.js
new file mode 100644
index 000000000000..06cfc1f2bed0
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-while-loop,-outer-topic-reference-in-loop-body/input.js
@@ -0,0 +1 @@
+value |> do { while (x < 50) x += #; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-while-loop,-outer-topic-reference-in-loop-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-while-loop,-outer-topic-reference-in-loop-body/options.json
new file mode 100644
index 000000000000..a3707cc91710
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-while-loop,-outer-topic-reference-in-loop-body/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"],
+  "throws": "Topic reference was used in a lexical context without topic binding (1:34)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-with-statement,-outer-topic-reference-in-with-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-with-statement,-outer-topic-reference-in-with-body/input.js
new file mode 100644
index 000000000000..4872290c9926
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-with-statement,-outer-topic-reference-in-with-body/input.js
@@ -0,0 +1 @@
+value |> do { with ({}) #; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-with-statement,-outer-topic-reference-in-with-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-with-statement,-outer-topic-reference-in-with-body/options.json
new file mode 100644
index 000000000000..fee1ffebc044
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unbound-topic,-do-expression,-with-statement,-outer-topic-reference-in-with-body/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"],
+  "throws": "Topic reference was used in a lexical context without topic binding (1:24)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unparenthesized-arrow-function-with-bare-parameter-and-bare-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unparenthesized-arrow-function-with-bare-parameter-and-bare-body/input.js
new file mode 100644
index 000000000000..00d1c2320d2f
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unparenthesized-arrow-function-with-bare-parameter-and-bare-body/input.js
@@ -0,0 +1 @@
+10 |> x => x + #;
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unparenthesized-arrow-function-with-bare-parameter-and-bare-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unparenthesized-arrow-function-with-bare-parameter-and-bare-body/options.json
new file mode 100644
index 000000000000..a684795fbfb9
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-topic-style,-unparenthesized-arrow-function-with-bare-parameter-and-bare-body/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Unexpected arrow \"=>\" after pipeline body; arrow function in pipeline body must be parenthesized (1:8)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-inner-class-in-pipeline-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-inner-class-in-pipeline-body/input.js
new file mode 100644
index 000000000000..a905d1b71159
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-inner-class-in-pipeline-body/input.js
@@ -0,0 +1 @@
+x |> class { constructor () { this.x = #; } }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-inner-class-in-pipeline-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-inner-class-in-pipeline-body/options.json
new file mode 100644
index 000000000000..6401af97db12
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-inner-class-in-pipeline-body/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Topic reference was used in a lexical context without topic binding (1:39)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-inner-function-in-pipeline-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-inner-function-in-pipeline-body/input.js
new file mode 100644
index 000000000000..8af92dbefe4a
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-inner-function-in-pipeline-body/input.js
@@ -0,0 +1 @@
+x |> function () { # }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-inner-function-in-pipeline-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-inner-function-in-pipeline-body/options.json
new file mode 100644
index 000000000000..e6731253189f
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-inner-function-in-pipeline-body/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Topic reference was used in a lexical context without topic binding (1:19)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-pipeline-head-in-inner-function-in-pipeline-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-pipeline-head-in-inner-function-in-pipeline-body/input.js
new file mode 100644
index 000000000000..818748040ed7
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-pipeline-head-in-inner-function-in-pipeline-body/input.js
@@ -0,0 +1 @@
+x |> function () { # |> # }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-pipeline-head-in-inner-function-in-pipeline-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-pipeline-head-in-inner-function-in-pipeline-body/options.json
new file mode 100644
index 000000000000..e6731253189f
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-pipeline-head-in-inner-function-in-pipeline-body/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Topic reference was used in a lexical context without topic binding (1:19)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-simple/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-simple/input.js
new file mode 100644
index 000000000000..2d07bd7883dc
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-simple/input.js
@@ -0,0 +1 @@
+1 + #
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-simple/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-simple/options.json
new file mode 100644
index 000000000000..79a8e0a3852e
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-error,-unbound-topic,-simple/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]],
+  "throws": "Topic reference was used in a lexical context without topic binding (1:4)"
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-bare-style/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-bare-style/input.js
new file mode 100644
index 000000000000..a5a21763a8eb
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-bare-style/input.js
@@ -0,0 +1 @@
+x |> (() => # |> f)
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-bare-style/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-bare-style/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-bare-style/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-bare-style/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-bare-style/output.json
new file mode 100644
index 000000000000..619f4e61b22b
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-bare-style/output.json
@@ -0,0 +1,184 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 19,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 19
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 19,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 19
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 19,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 19
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 19,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 19
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 1,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 1
+              },
+              "identifierName": "x"
+            },
+            "name": "x"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 5,
+            "end": 19,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 5
+              },
+              "end": {
+                "line": 1,
+                "column": 19
+              }
+            },
+            "expression": {
+              "type": "ArrowFunctionExpression",
+              "start": 6,
+              "end": 18,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 6
+                },
+                "end": {
+                  "line": 1,
+                  "column": 18
+                }
+              },
+              "id": null,
+              "generator": false,
+              "async": false,
+              "params": [],
+              "body": {
+                "type": "BinaryExpression",
+                "start": 12,
+                "end": 18,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 12
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 18
+                  }
+                },
+                "left": {
+                  "type": "PrimaryTopicReference",
+                  "start": 12,
+                  "end": 13,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 12
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 13
+                    }
+                  }
+                },
+                "operator": "|>",
+                "right": {
+                  "type": "PipelineBareFunction",
+                  "start": 17,
+                  "end": 18,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 17
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 18
+                    }
+                  },
+                  "callee": {
+                    "type": "Identifier",
+                    "start": 17,
+                    "end": 18,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 17
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 18
+                      },
+                      "identifierName": "f"
+                    },
+                    "name": "f"
+                  }
+                }
+              },
+              "extra": {
+                "parenthesized": true,
+                "parenStart": 5
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-topic-style/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-topic-style/input.js
new file mode 100644
index 000000000000..e8fc8e430b8e
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-topic-style/input.js
@@ -0,0 +1 @@
+x |> ($ => # |> f(#, $))
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-topic-style/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-topic-style/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-topic-style/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-topic-style/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-topic-style/output.json
new file mode 100644
index 000000000000..b83895f5f4c3
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-arrow-function-with-topic-style/output.json
@@ -0,0 +1,251 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 24,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 24
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 24,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 24
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 24,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 24
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 24,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 24
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 1,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 1
+              },
+              "identifierName": "x"
+            },
+            "name": "x"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 5,
+            "end": 24,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 5
+              },
+              "end": {
+                "line": 1,
+                "column": 24
+              }
+            },
+            "expression": {
+              "type": "ArrowFunctionExpression",
+              "start": 6,
+              "end": 23,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 6
+                },
+                "end": {
+                  "line": 1,
+                  "column": 23
+                }
+              },
+              "id": null,
+              "generator": false,
+              "async": false,
+              "params": [
+                {
+                  "type": "Identifier",
+                  "start": 6,
+                  "end": 7,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 6
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 7
+                    },
+                    "identifierName": "$"
+                  },
+                  "name": "$"
+                }
+              ],
+              "body": {
+                "type": "BinaryExpression",
+                "start": 11,
+                "end": 23,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 11
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 23
+                  }
+                },
+                "left": {
+                  "type": "PrimaryTopicReference",
+                  "start": 11,
+                  "end": 12,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 11
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 12
+                    }
+                  }
+                },
+                "operator": "|>",
+                "right": {
+                  "type": "PipelineTopicExpression",
+                  "start": 16,
+                  "end": 23,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 16
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 23
+                    }
+                  },
+                  "expression": {
+                    "type": "CallExpression",
+                    "start": 16,
+                    "end": 23,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 16
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 23
+                      }
+                    },
+                    "callee": {
+                      "type": "Identifier",
+                      "start": 16,
+                      "end": 17,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 16
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 17
+                        },
+                        "identifierName": "f"
+                      },
+                      "name": "f"
+                    },
+                    "arguments": [
+                      {
+                        "type": "PrimaryTopicReference",
+                        "start": 18,
+                        "end": 19,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 18
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 19
+                          }
+                        }
+                      },
+                      {
+                        "type": "Identifier",
+                        "start": 21,
+                        "end": 22,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 21
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 22
+                          },
+                          "identifierName": "$"
+                        },
+                        "name": "$"
+                      }
+                    ]
+                  }
+                }
+              },
+              "extra": {
+                "parenthesized": true,
+                "parenStart": 5
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-bare-style/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-bare-style/input.js
new file mode 100644
index 000000000000..a462b80cbbd8
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-bare-style/input.js
@@ -0,0 +1 @@
+x |> (# |> f)
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-bare-style/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-bare-style/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-bare-style/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-bare-style/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-bare-style/output.json
new file mode 100644
index 000000000000..c2bc9ec1b75c
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-bare-style/output.json
@@ -0,0 +1,165 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 13,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 13
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 13,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 13
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 13,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 13
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 13,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 13
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 1,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 1
+              },
+              "identifierName": "x"
+            },
+            "name": "x"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 5,
+            "end": 13,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 5
+              },
+              "end": {
+                "line": 1,
+                "column": 13
+              }
+            },
+            "expression": {
+              "type": "BinaryExpression",
+              "start": 6,
+              "end": 12,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 6
+                },
+                "end": {
+                  "line": 1,
+                  "column": 12
+                }
+              },
+              "left": {
+                "type": "PrimaryTopicReference",
+                "start": 6,
+                "end": 7,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 6
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 7
+                  }
+                }
+              },
+              "operator": "|>",
+              "right": {
+                "type": "PipelineBareFunction",
+                "start": 11,
+                "end": 12,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 11
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 12
+                  }
+                },
+                "callee": {
+                  "type": "Identifier",
+                  "start": 11,
+                  "end": 12,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 11
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 12
+                    },
+                    "identifierName": "f"
+                  },
+                  "name": "f"
+                }
+              },
+              "extra": {
+                "parenthesized": true,
+                "parenStart": 5
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-topic-style/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-topic-style/input.js
new file mode 100644
index 000000000000..2668daa465d1
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-topic-style/input.js
@@ -0,0 +1 @@
+x |> (# |> f(#, x))
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-topic-style/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-topic-style/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-topic-style/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-topic-style/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-topic-style/output.json
new file mode 100644
index 000000000000..683de81b9c6a
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-nested-pipelines,-topic-style-with-inner-topic-style/output.json
@@ -0,0 +1,214 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 19,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 19
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 19,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 19
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 19,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 19
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 19,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 19
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 1,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 1
+              },
+              "identifierName": "x"
+            },
+            "name": "x"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 5,
+            "end": 19,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 5
+              },
+              "end": {
+                "line": 1,
+                "column": 19
+              }
+            },
+            "expression": {
+              "type": "BinaryExpression",
+              "start": 6,
+              "end": 18,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 6
+                },
+                "end": {
+                  "line": 1,
+                  "column": 18
+                }
+              },
+              "left": {
+                "type": "PrimaryTopicReference",
+                "start": 6,
+                "end": 7,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 6
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 7
+                  }
+                }
+              },
+              "operator": "|>",
+              "right": {
+                "type": "PipelineTopicExpression",
+                "start": 11,
+                "end": 18,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 11
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 18
+                  }
+                },
+                "expression": {
+                  "type": "CallExpression",
+                  "start": 11,
+                  "end": 18,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 11
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 18
+                    }
+                  },
+                  "callee": {
+                    "type": "Identifier",
+                    "start": 11,
+                    "end": 12,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 11
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 12
+                      },
+                      "identifierName": "f"
+                    },
+                    "name": "f"
+                  },
+                  "arguments": [
+                    {
+                      "type": "PrimaryTopicReference",
+                      "start": 13,
+                      "end": 14,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 13
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 14
+                        }
+                      }
+                    },
+                    {
+                      "type": "Identifier",
+                      "start": 16,
+                      "end": 17,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 16
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 17
+                        },
+                        "identifierName": "x"
+                      },
+                      "name": "x"
+                    }
+                  ]
+                }
+              },
+              "extra": {
+                "parenthesized": true,
+                "parenStart": 5
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-multiline/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-multiline/input.js
new file mode 100644
index 000000000000..0045c931d1e3
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-multiline/input.js
@@ -0,0 +1,7 @@
+async function af () {
+  let result = "hello"
+  |> # + ''
+  |> new DoubleSay
+  |> capitalize
+  |> await exclaim;
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-multiline/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-multiline/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-multiline/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-multiline/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-multiline/output.json
new file mode 100644
index 000000000000..8f5a0c112d2e
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-multiline/output.json
@@ -0,0 +1,384 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 114,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 7,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 114,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 7,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "FunctionDeclaration",
+        "start": 0,
+        "end": 114,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 7,
+            "column": 1
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 15,
+          "end": 17,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 15
+            },
+            "end": {
+              "line": 1,
+              "column": 17
+            },
+            "identifierName": "af"
+          },
+          "name": "af"
+        },
+        "generator": false,
+        "async": true,
+        "params": [],
+        "body": {
+          "type": "BlockStatement",
+          "start": 21,
+          "end": 114,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 21
+            },
+            "end": {
+              "line": 7,
+              "column": 1
+            }
+          },
+          "body": [
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+              "end": 112,
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+                  "column": 19
+                }
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+                      "end": 92,
+                      "loc": {
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+                        },
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+                          "column": 15
+                        }
+                      },
+                      "left": {
+                        "type": "BinaryExpression",
+                        "start": 38,
+                        "end": 76,
+                        "loc": {
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+                            "column": 15
+                          },
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+                            "line": 4,
+                            "column": 18
+                          }
+                        },
+                        "left": {
+                          "type": "BinaryExpression",
+                          "start": 38,
+                          "end": 57,
+                          "loc": {
+                            "start": {
+                              "line": 2,
+                              "column": 15
+                            },
+                            "end": {
+                              "line": 3,
+                              "column": 11
+                            }
+                          },
+                          "left": {
+                            "type": "StringLiteral",
+                            "start": 38,
+                            "end": 45,
+                            "loc": {
+                              "start": {
+                                "line": 2,
+                                "column": 15
+                              },
+                              "end": {
+                                "line": 2,
+                                "column": 22
+                              }
+                            },
+                            "extra": {
+                              "rawValue": "hello",
+                              "raw": "\"hello\""
+                            },
+                            "value": "hello"
+                          },
+                          "operator": "|>",
+                          "right": {
+                            "type": "PipelineTopicExpression",
+                            "start": 51,
+                            "end": 57,
+                            "loc": {
+                              "start": {
+                                "line": 3,
+                                "column": 5
+                              },
+                              "end": {
+                                "line": 3,
+                                "column": 11
+                              }
+                            },
+                            "expression": {
+                              "type": "BinaryExpression",
+                              "start": 51,
+                              "end": 57,
+                              "loc": {
+                                "start": {
+                                  "line": 3,
+                                  "column": 5
+                                },
+                                "end": {
+                                  "line": 3,
+                                  "column": 11
+                                }
+                              },
+                              "left": {
+                                "type": "PrimaryTopicReference",
+                                "start": 51,
+                                "end": 52,
+                                "loc": {
+                                  "start": {
+                                    "line": 3,
+                                    "column": 5
+                                  },
+                                  "end": {
+                                    "line": 3,
+                                    "column": 6
+                                  }
+                                }
+                              },
+                              "operator": "+",
+                              "right": {
+                                "type": "StringLiteral",
+                                "start": 55,
+                                "end": 57,
+                                "loc": {
+                                  "start": {
+                                    "line": 3,
+                                    "column": 9
+                                  },
+                                  "end": {
+                                    "line": 3,
+                                    "column": 11
+                                  }
+                                },
+                                "extra": {
+                                  "rawValue": "",
+                                  "raw": "''"
+                                },
+                                "value": ""
+                              }
+                            }
+                          }
+                        },
+                        "operator": "|>",
+                        "right": {
+                          "type": "PipelineBareConstructor",
+                          "start": 63,
+                          "end": 76,
+                          "loc": {
+                            "start": {
+                              "line": 4,
+                              "column": 5
+                            },
+                            "end": {
+                              "line": 4,
+                              "column": 18
+                            }
+                          },
+                          "callee": {
+                            "type": "Identifier",
+                            "start": 67,
+                            "end": 76,
+                            "loc": {
+                              "start": {
+                                "line": 4,
+                                "column": 9
+                              },
+                              "end": {
+                                "line": 4,
+                                "column": 18
+                              },
+                              "identifierName": "DoubleSay"
+                            },
+                            "name": "DoubleSay"
+                          }
+                        }
+                      },
+                      "operator": "|>",
+                      "right": {
+                        "type": "PipelineBareFunction",
+                        "start": 82,
+                        "end": 92,
+                        "loc": {
+                          "start": {
+                            "line": 5,
+                            "column": 5
+                          },
+                          "end": {
+                            "line": 5,
+                            "column": 15
+                          }
+                        },
+                        "callee": {
+                          "type": "Identifier",
+                          "start": 82,
+                          "end": 92,
+                          "loc": {
+                            "start": {
+                              "line": 5,
+                              "column": 5
+                            },
+                            "end": {
+                              "line": 5,
+                              "column": 15
+                            },
+                            "identifierName": "capitalize"
+                          },
+                          "name": "capitalize"
+                        }
+                      }
+                    },
+                    "operator": "|>",
+                    "right": {
+                      "type": "PipelineBareAwaitedFunction",
+                      "start": 98,
+                      "end": 111,
+                      "loc": {
+                        "start": {
+                          "line": 6,
+                          "column": 5
+                        },
+                        "end": {
+                          "line": 6,
+                          "column": 18
+                        }
+                      },
+                      "callee": {
+                        "type": "Identifier",
+                        "start": 104,
+                        "end": 111,
+                        "loc": {
+                          "start": {
+                            "line": 6,
+                            "column": 11
+                          },
+                          "end": {
+                            "line": 6,
+                            "column": 18
+                          },
+                          "identifierName": "exclaim"
+                        },
+                        "name": "exclaim"
+                      }
+                    }
+                  }
+                }
+              ],
+              "kind": "let"
+            }
+          ],
+          "directives": []
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-single-line/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-single-line/input.js
new file mode 100644
index 000000000000..ed1cd16aad0f
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-single-line/input.js
@@ -0,0 +1,3 @@
+async function af () {
+  x |> inc |> await double |> # + 1
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-single-line/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-single-line/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-single-line/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-single-line/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-single-line/output.json
new file mode 100644
index 000000000000..2fa260909358
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-style-mix,-single-line/output.json
@@ -0,0 +1,298 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 60,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 3,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 60,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 3,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "FunctionDeclaration",
+        "start": 0,
+        "end": 60,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 3,
+            "column": 1
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 15,
+          "end": 17,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 15
+            },
+            "end": {
+              "line": 1,
+              "column": 17
+            },
+            "identifierName": "af"
+          },
+          "name": "af"
+        },
+        "generator": false,
+        "async": true,
+        "params": [],
+        "body": {
+          "type": "BlockStatement",
+          "start": 21,
+          "end": 60,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 21
+            },
+            "end": {
+              "line": 3,
+              "column": 1
+            }
+          },
+          "body": [
+            {
+              "type": "ExpressionStatement",
+              "start": 25,
+              "end": 58,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 2
+                },
+                "end": {
+                  "line": 2,
+                  "column": 35
+                }
+              },
+              "expression": {
+                "type": "BinaryExpression",
+                "start": 25,
+                "end": 58,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 2
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 35
+                  }
+                },
+                "left": {
+                  "type": "BinaryExpression",
+                  "start": 25,
+                  "end": 49,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 2
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 26
+                    }
+                  },
+                  "left": {
+                    "type": "BinaryExpression",
+                    "start": 25,
+                    "end": 33,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 2
+                      },
+                      "end": {
+                        "line": 2,
+                        "column": 10
+                      }
+                    },
+                    "left": {
+                      "type": "Identifier",
+                      "start": 25,
+                      "end": 26,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 2
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 3
+                        },
+                        "identifierName": "x"
+                      },
+                      "name": "x"
+                    },
+                    "operator": "|>",
+                    "right": {
+                      "type": "PipelineBareFunction",
+                      "start": 30,
+                      "end": 33,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 7
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 10
+                        }
+                      },
+                      "callee": {
+                        "type": "Identifier",
+                        "start": 30,
+                        "end": 33,
+                        "loc": {
+                          "start": {
+                            "line": 2,
+                            "column": 7
+                          },
+                          "end": {
+                            "line": 2,
+                            "column": 10
+                          },
+                          "identifierName": "inc"
+                        },
+                        "name": "inc"
+                      }
+                    }
+                  },
+                  "operator": "|>",
+                  "right": {
+                    "type": "PipelineBareAwaitedFunction",
+                    "start": 37,
+                    "end": 49,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 14
+                      },
+                      "end": {
+                        "line": 2,
+                        "column": 26
+                      }
+                    },
+                    "callee": {
+                      "type": "Identifier",
+                      "start": 43,
+                      "end": 49,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 20
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 26
+                        },
+                        "identifierName": "double"
+                      },
+                      "name": "double"
+                    }
+                  }
+                },
+                "operator": "|>",
+                "right": {
+                  "type": "PipelineTopicExpression",
+                  "start": 53,
+                  "end": 58,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 30
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 35
+                    }
+                  },
+                  "expression": {
+                    "type": "BinaryExpression",
+                    "start": 53,
+                    "end": 58,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 30
+                      },
+                      "end": {
+                        "line": 2,
+                        "column": 35
+                      }
+                    },
+                    "left": {
+                      "type": "PrimaryTopicReference",
+                      "start": 53,
+                      "end": 54,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 30
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 31
+                        }
+                      }
+                    },
+                    "operator": "+",
+                    "right": {
+                      "type": "NumericLiteral",
+                      "start": 57,
+                      "end": 58,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 34
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 35
+                        }
+                      },
+                      "extra": {
+                        "rawValue": 1,
+                        "raw": "1"
+                      },
+                      "value": 1
+                    }
+                  }
+                }
+              }
+            }
+          ],
+          "directives": []
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-first/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-first/input.js
new file mode 100644
index 000000000000..9d3fa9212120
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-first/input.js
@@ -0,0 +1 @@
+value |> # + 1
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-first/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-first/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-first/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-first/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-first/output.json
new file mode 100644
index 000000000000..8f9687369fc5
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-first/output.json
@@ -0,0 +1,149 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 14,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 14
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 14,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 14
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 14,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 14
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 14,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 14
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 14,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 1,
+                "column": 14
+              }
+            },
+            "expression": {
+              "type": "BinaryExpression",
+              "start": 9,
+              "end": 14,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 14
+                }
+              },
+              "left": {
+                "type": "PrimaryTopicReference",
+                "start": 9,
+                "end": 10,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 9
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 10
+                  }
+                }
+              },
+              "operator": "+",
+              "right": {
+                "type": "NumericLiteral",
+                "start": 13,
+                "end": 14,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 13
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 14
+                  }
+                },
+                "extra": {
+                  "rawValue": 1,
+                  "raw": "1"
+                },
+                "value": 1
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-last/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-last/input.js
new file mode 100644
index 000000000000..64ea7f0bcd1e
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-last/input.js
@@ -0,0 +1 @@
+value |> 1 + #
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-last/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-last/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-last/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-last/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-last/output.json
new file mode 100644
index 000000000000..844200b657a3
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-addition,-single-line-arrow-function,-topic-reference-last/output.json
@@ -0,0 +1,149 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 14,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 14
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 14,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 14
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 14,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
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+                    "column": 10
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+                "extra": {
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+                  "raw": "1"
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+              },
+              "operator": "+",
+              "right": {
+                "type": "PrimaryTopicReference",
+                "start": 13,
+                "end": 14,
+                "loc": {
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+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 14
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-head/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-head/input.js
new file mode 100644
index 000000000000..e5917937bc70
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-head/input.js
@@ -0,0 +1 @@
+value |> do { do x += 1; while (x < #); }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-head/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-head/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-head/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-head/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-head/output.json
new file mode 100644
index 000000000000..338ed0d21c54
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-do-while-loop,-outer-topic-reference-in-loop-head/output.json
@@ -0,0 +1,262 @@
+{
+  "type": "File",
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+  "end": 41,
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+    "end": 41,
+    "loc": {
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+        "column": 0
+      },
+      "end": {
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+        "column": 41
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
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+        "end": 41,
+        "loc": {
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+            "column": 41
+          }
+        },
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+            }
+          },
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+            "end": 5,
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+              },
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+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
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+            "end": 41,
+            "loc": {
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+                "column": 9
+              },
+              "end": {
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+                "column": 41
+              }
+            },
+            "expression": {
+              "type": "DoExpression",
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+              "end": 41,
+              "loc": {
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+                  }
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+                        },
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+                        }
+                      },
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+                        "end": 23,
+                        "loc": {
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+                          },
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+                            "column": 23
+                          }
+                        },
+                        "operator": "+=",
+                        "left": {
+                          "type": "Identifier",
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+                          "end": 18,
+                          "loc": {
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+                              "column": 17
+                            },
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+                              "column": 18
+                            },
+                            "identifierName": "x"
+                          },
+                          "name": "x"
+                        },
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+                          "type": "NumericLiteral",
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+                            "raw": "1"
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+                      "start": 32,
+                      "end": 37,
+                      "loc": {
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+                          "column": 32
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+                        "loc": {
+                          "start": {
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+                            "column": 32
+                          },
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+                            "column": 33
+                          },
+                          "identifierName": "x"
+                        },
+                        "name": "x"
+                      },
+                      "operator": "<",
+                      "right": {
+                        "type": "PrimaryTopicReference",
+                        "start": 36,
+                        "end": 37,
+                        "loc": {
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+                          }
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+                "directives": []
+              }
+            }
+          }
+        }
+      }
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+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-head/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-head/input.js
new file mode 100644
index 000000000000..197761dcd742
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-head/input.js
@@ -0,0 +1,3 @@
+async function af () {
+  value |> do { for await (const e of #) e; }
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-head/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-head/options.json
new file mode 100644
index 000000000000..791fe8252d11
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-head/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions", "asyncGenerators"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-head/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-head/output.json
new file mode 100644
index 000000000000..727bcebb1146
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-await-of-loop,-outer-topic-reference-in-loop-head/output.json
@@ -0,0 +1,298 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 70,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 3,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 70,
+    "loc": {
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+        "column": 0
+      },
+      "end": {
+        "line": 3,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
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+        "type": "FunctionDeclaration",
+        "start": 0,
+        "end": 70,
+        "loc": {
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+            "column": 0
+          },
+          "end": {
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+            "column": 1
+          }
+        },
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+          "type": "Identifier",
+          "start": 15,
+          "end": 17,
+          "loc": {
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+              "column": 15
+            },
+            "end": {
+              "line": 1,
+              "column": 17
+            },
+            "identifierName": "af"
+          },
+          "name": "af"
+        },
+        "generator": false,
+        "async": true,
+        "params": [],
+        "body": {
+          "type": "BlockStatement",
+          "start": 21,
+          "end": 70,
+          "loc": {
+            "start": {
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+              "column": 21
+            },
+            "end": {
+              "line": 3,
+              "column": 1
+            }
+          },
+          "body": [
+            {
+              "type": "ExpressionStatement",
+              "start": 25,
+              "end": 68,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 2
+                },
+                "end": {
+                  "line": 2,
+                  "column": 45
+                }
+              },
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+                "end": 68,
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+                    "column": 45
+                  }
+                },
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+                  "end": 30,
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+                  "end": 68,
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+                    "end": 68,
+                    "loc": {
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+                        "column": 45
+                      }
+                    },
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+                      "type": "BlockStatement",
+                      "start": 37,
+                      "end": 68,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 14
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 45
+                        }
+                      },
+                      "body": [
+                        {
+                          "type": "ForOfStatement",
+                          "start": 39,
+                          "end": 66,
+                          "loc": {
+                            "start": {
+                              "line": 2,
+                              "column": 16
+                            },
+                            "end": {
+                              "line": 2,
+                              "column": 43
+                            }
+                          },
+                          "await": true,
+                          "left": {
+                            "type": "VariableDeclaration",
+                            "start": 50,
+                            "end": 57,
+                            "loc": {
+                              "start": {
+                                "line": 2,
+                                "column": 27
+                              },
+                              "end": {
+                                "line": 2,
+                                "column": 34
+                              }
+                            },
+                            "declarations": [
+                              {
+                                "type": "VariableDeclarator",
+                                "start": 56,
+                                "end": 57,
+                                "loc": {
+                                  "start": {
+                                    "line": 2,
+                                    "column": 33
+                                  },
+                                  "end": {
+                                    "line": 2,
+                                    "column": 34
+                                  }
+                                },
+                                "id": {
+                                  "type": "Identifier",
+                                  "start": 56,
+                                  "end": 57,
+                                  "loc": {
+                                    "start": {
+                                      "line": 2,
+                                      "column": 33
+                                    },
+                                    "end": {
+                                      "line": 2,
+                                      "column": 34
+                                    },
+                                    "identifierName": "e"
+                                  },
+                                  "name": "e"
+                                },
+                                "init": null
+                              }
+                            ],
+                            "kind": "const"
+                          },
+                          "right": {
+                            "type": "PrimaryTopicReference",
+                            "start": 61,
+                            "end": 62,
+                            "loc": {
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+                                "line": 2,
+                                "column": 38
+                              },
+                              "end": {
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+                                "column": 39
+                              }
+                            }
+                          },
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+                            "type": "ExpressionStatement",
+                            "start": 64,
+                            "end": 66,
+                            "loc": {
+                              "start": {
+                                "line": 2,
+                                "column": 41
+                              },
+                              "end": {
+                                "line": 2,
+                                "column": 43
+                              }
+                            },
+                            "expression": {
+                              "type": "Identifier",
+                              "start": 64,
+                              "end": 65,
+                              "loc": {
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+                                  "line": 2,
+                                  "column": 41
+                                },
+                                "end": {
+                                  "line": 2,
+                                  "column": 42
+                                },
+                                "identifierName": "e"
+                              },
+                              "name": "e"
+                            }
+                          }
+                        }
+                      ],
+                      "directives": []
+                    }
+                  }
+                }
+              }
+            }
+          ],
+          "directives": []
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-head/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-head/input.js
new file mode 100644
index 000000000000..1e14a50cda84
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-head/input.js
@@ -0,0 +1 @@
+value |> do { for (let i = #; predicate(i, #); i += #) i; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-head/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-head/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-head/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-head/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-head/output.json
new file mode 100644
index 000000000000..39abf98f7e6d
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-classic-loop,-outer-topic-reference-in-loop-head/output.json
@@ -0,0 +1,357 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 59,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
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+      "line": 1,
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+    }
+  },
+  "program": {
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+    "end": 59,
+    "loc": {
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+        "column": 0
+      },
+      "end": {
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+        "column": 59
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
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+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 59,
+        "loc": {
+          "start": {
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+            "column": 0
+          },
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+            "column": 59
+          }
+        },
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+            },
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+              "column": 59
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 59,
+            "loc": {
+              "start": {
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+                "end": 59,
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+                        },
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+                          "line": 1,
+                          "column": 28
+                        }
+                      },
+                      "declarations": [
+                        {
+                          "type": "VariableDeclarator",
+                          "start": 23,
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+                          "loc": {
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+                              "column": 23
+                            },
+                            "end": {
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+                              "column": 28
+                            }
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+                            "type": "Identifier",
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+                            "end": 24,
+                            "loc": {
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+                                "column": 23
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+                                "column": 24
+                              },
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+                            },
+                            "name": "i"
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+                                "column": 28
+                              }
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+                        },
+                        "name": "predicate"
+                      },
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+                        {
+                          "type": "Identifier",
+                          "start": 40,
+                          "end": 41,
+                          "loc": {
+                            "start": {
+                              "line": 1,
+                              "column": 40
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 41
+                            },
+                            "identifierName": "i"
+                          },
+                          "name": "i"
+                        },
+                        {
+                          "type": "PrimaryTopicReference",
+                          "start": 43,
+                          "end": 44,
+                          "loc": {
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+                              "column": 43
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+                            "end": {
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+                              "column": 44
+                            }
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+                      "end": 53,
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+                        "end": {
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+                      "left": {
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+                        "end": 48,
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+                            "column": 47
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 48
+                          },
+                          "identifierName": "i"
+                        },
+                        "name": "i"
+                      },
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+                        "start": 52,
+                        "end": 53,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 52
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 53
+                          }
+                        }
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+                    },
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+                      "type": "ExpressionStatement",
+                      "start": 55,
+                      "end": 57,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 55
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 57
+                        }
+                      },
+                      "expression": {
+                        "type": "Identifier",
+                        "start": 55,
+                        "end": 56,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 55
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 56
+                          },
+                          "identifierName": "i"
+                        },
+                        "name": "i"
+                      }
+                    }
+                  }
+                ],
+                "directives": []
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-head/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-head/input.js
new file mode 100644
index 000000000000..096c359535e5
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-head/input.js
@@ -0,0 +1 @@
+value |> do { for (e in #) e; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-head/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-head/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-head/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-head/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-head/output.json
new file mode 100644
index 000000000000..eddca7faa4b9
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-in-loop,-outer-topic-reference-in-loop-head/output.json
@@ -0,0 +1,210 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 31,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
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+      "column": 31
+    }
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+  "program": {
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+    "end": 31,
+    "loc": {
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+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 31
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
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+        "end": 31,
+        "loc": {
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+            "column": 31
+          }
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+          "end": 31,
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+              "line": 1,
+              "column": 31
+            }
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+            "start": 0,
+            "end": 5,
+            "loc": {
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+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 31,
+            "loc": {
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+                "column": 9
+              },
+              "end": {
+                "line": 1,
+                "column": 31
+              }
+            },
+            "expression": {
+              "type": "DoExpression",
+              "start": 9,
+              "end": 31,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 31
+                }
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+                "end": 31,
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+                  }
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+                        },
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+                          },
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+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-head/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-head/input.js
new file mode 100644
index 000000000000..b3e5f40ef7fd
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-head/input.js
@@ -0,0 +1 @@
+value |> do { for (e of #) e; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-head/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-head/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-head/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-head/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-head/output.json
new file mode 100644
index 000000000000..79f6c6b771be
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-for-of-loop,-outer-topic-reference-in-loop-head/output.json
@@ -0,0 +1,211 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 31,
+  "loc": {
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+    }
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+      }
+    },
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+    "interpreter": null,
+    "body": [
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+              },
+              "end": {
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+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
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+            "end": 31,
+            "loc": {
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+                "column": 9
+              },
+              "end": {
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+                "column": 31
+              }
+            },
+            "expression": {
+              "type": "DoExpression",
+              "start": 9,
+              "end": 31,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 31
+                }
+              },
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+                            "line": 1,
+                            "column": 28
+                          },
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+                        },
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+                      }
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+                  }
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+                "directives": []
+              }
+            }
+          }
+        }
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+    ],
+    "directives": []
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+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-identity/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-identity/input.js
new file mode 100644
index 000000000000..f78ceb724f12
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-identity/input.js
@@ -0,0 +1 @@
+value |> do { #; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-identity/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-identity/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-identity/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-identity/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-identity/output.json
new file mode 100644
index 000000000000..c1394ed9d8f0
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-identity/output.json
@@ -0,0 +1,161 @@
+{
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+  "end": 18,
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+              "column": 18
+            }
+          },
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+              },
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+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
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+            "type": "PipelineTopicExpression",
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+            "end": 18,
+            "loc": {
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+              },
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+                "column": 18
+              }
+            },
+            "expression": {
+              "type": "DoExpression",
+              "start": 9,
+              "end": 18,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 18
+                }
+              },
+              "body": {
+                "type": "BlockStatement",
+                "start": 12,
+                "end": 18,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 12
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 18
+                  }
+                },
+                "body": [
+                  {
+                    "type": "ExpressionStatement",
+                    "start": 14,
+                    "end": 16,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 14
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 16
+                      }
+                    },
+                    "expression": {
+                      "type": "PrimaryTopicReference",
+                      "start": 14,
+                      "end": 15,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 14
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 15
+                        }
+                      }
+                    }
+                  }
+                ],
+                "directives": []
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-body/input.js
new file mode 100644
index 000000000000..b4c8778046ed
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-body/input.js
@@ -0,0 +1 @@
+value |> do { if (yes) null; else if (no) #; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-body/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-body/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-body/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-body/output.json
new file mode 100644
index 000000000000..7900de3f1399
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-body/output.json
@@ -0,0 +1,256 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 46,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 46
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 46,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 46
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 46,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 46
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 46,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 46
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 46,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 1,
+                "column": 46
+              }
+            },
+            "expression": {
+              "type": "DoExpression",
+              "start": 9,
+              "end": 46,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 46
+                }
+              },
+              "body": {
+                "type": "BlockStatement",
+                "start": 12,
+                "end": 46,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 12
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 46
+                  }
+                },
+                "body": [
+                  {
+                    "type": "IfStatement",
+                    "start": 14,
+                    "end": 44,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 14
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 44
+                      }
+                    },
+                    "test": {
+                      "type": "Identifier",
+                      "start": 18,
+                      "end": 21,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 18
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 21
+                        },
+                        "identifierName": "yes"
+                      },
+                      "name": "yes"
+                    },
+                    "consequent": {
+                      "type": "ExpressionStatement",
+                      "start": 23,
+                      "end": 28,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 23
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 28
+                        }
+                      },
+                      "expression": {
+                        "type": "NullLiteral",
+                        "start": 23,
+                        "end": 27,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 23
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 27
+                          }
+                        }
+                      }
+                    },
+                    "alternate": {
+                      "type": "IfStatement",
+                      "start": 34,
+                      "end": 44,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 34
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 44
+                        }
+                      },
+                      "test": {
+                        "type": "Identifier",
+                        "start": 38,
+                        "end": 40,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 38
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 40
+                          },
+                          "identifierName": "no"
+                        },
+                        "name": "no"
+                      },
+                      "consequent": {
+                        "type": "ExpressionStatement",
+                        "start": 42,
+                        "end": 44,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 42
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 44
+                          }
+                        },
+                        "expression": {
+                          "type": "PrimaryTopicReference",
+                          "start": 42,
+                          "end": 43,
+                          "loc": {
+                            "start": {
+                              "line": 1,
+                              "column": 42
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 43
+                            }
+                          }
+                        }
+                      },
+                      "alternate": null
+                    }
+                  }
+                ],
+                "directives": []
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-if-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-if-body/input.js
new file mode 100644
index 000000000000..0b1fd66aaa3c
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-if-body/input.js
@@ -0,0 +1 @@
+value |> do { if (yes) null; else #; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-if-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-if-body/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-if-body/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-if-body/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-if-body/output.json
new file mode 100644
index 000000000000..4bd2a955d177
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-else-if-body/output.json
@@ -0,0 +1,223 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 38,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 38
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 38,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 38
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 38,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 38
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 38,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 38
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 38,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 1,
+                "column": 38
+              }
+            },
+            "expression": {
+              "type": "DoExpression",
+              "start": 9,
+              "end": 38,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 38
+                }
+              },
+              "body": {
+                "type": "BlockStatement",
+                "start": 12,
+                "end": 38,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 12
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 38
+                  }
+                },
+                "body": [
+                  {
+                    "type": "IfStatement",
+                    "start": 14,
+                    "end": 36,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 14
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 36
+                      }
+                    },
+                    "test": {
+                      "type": "Identifier",
+                      "start": 18,
+                      "end": 21,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 18
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 21
+                        },
+                        "identifierName": "yes"
+                      },
+                      "name": "yes"
+                    },
+                    "consequent": {
+                      "type": "ExpressionStatement",
+                      "start": 23,
+                      "end": 28,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 23
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 28
+                        }
+                      },
+                      "expression": {
+                        "type": "NullLiteral",
+                        "start": 23,
+                        "end": 27,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 23
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 27
+                          }
+                        }
+                      }
+                    },
+                    "alternate": {
+                      "type": "ExpressionStatement",
+                      "start": 34,
+                      "end": 36,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 34
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 36
+                        }
+                      },
+                      "expression": {
+                        "type": "PrimaryTopicReference",
+                        "start": 34,
+                        "end": 35,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 34
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 35
+                          }
+                        }
+                      }
+                    }
+                  }
+                ],
+                "directives": []
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-body/input.js
new file mode 100644
index 000000000000..bd64bfb5b763
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-body/input.js
@@ -0,0 +1 @@
+value |> do { if (yes) #; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-body/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-body/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-body/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-body/output.json
new file mode 100644
index 000000000000..11c2656ea035
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-body/output.json
@@ -0,0 +1,194 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 27,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 27
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 27,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 27
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 27,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 27
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 27,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 27
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 27,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 1,
+                "column": 27
+              }
+            },
+            "expression": {
+              "type": "DoExpression",
+              "start": 9,
+              "end": 27,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 27
+                }
+              },
+              "body": {
+                "type": "BlockStatement",
+                "start": 12,
+                "end": 27,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 12
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 27
+                  }
+                },
+                "body": [
+                  {
+                    "type": "IfStatement",
+                    "start": 14,
+                    "end": 25,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 14
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 25
+                      }
+                    },
+                    "test": {
+                      "type": "Identifier",
+                      "start": 18,
+                      "end": 21,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 18
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 21
+                        },
+                        "identifierName": "yes"
+                      },
+                      "name": "yes"
+                    },
+                    "consequent": {
+                      "type": "ExpressionStatement",
+                      "start": 23,
+                      "end": 25,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 23
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 25
+                        }
+                      },
+                      "expression": {
+                        "type": "PrimaryTopicReference",
+                        "start": 23,
+                        "end": 24,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 23
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 24
+                          }
+                        }
+                      }
+                    },
+                    "alternate": null
+                  }
+                ],
+                "directives": []
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-head/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-head/input.js
new file mode 100644
index 000000000000..8457c4e57f71
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-head/input.js
@@ -0,0 +1 @@
+value |> do { if (#) 1; else 0; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-head/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-head/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-head/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-head/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-head/output.json
new file mode 100644
index 000000000000..48d8f663f2cb
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-if-statement,-outer-topic-reference-in-if-head/output.json
@@ -0,0 +1,231 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 33,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 33
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 33,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 33
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 33,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 33
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 33,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 33
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 33,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 1,
+                "column": 33
+              }
+            },
+            "expression": {
+              "type": "DoExpression",
+              "start": 9,
+              "end": 33,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 33
+                }
+              },
+              "body": {
+                "type": "BlockStatement",
+                "start": 12,
+                "end": 33,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 12
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 33
+                  }
+                },
+                "body": [
+                  {
+                    "type": "IfStatement",
+                    "start": 14,
+                    "end": 31,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 14
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 31
+                      }
+                    },
+                    "test": {
+                      "type": "PrimaryTopicReference",
+                      "start": 18,
+                      "end": 19,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 18
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 19
+                        }
+                      }
+                    },
+                    "consequent": {
+                      "type": "ExpressionStatement",
+                      "start": 21,
+                      "end": 23,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 21
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 23
+                        }
+                      },
+                      "expression": {
+                        "type": "NumericLiteral",
+                        "start": 21,
+                        "end": 22,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 21
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 22
+                          }
+                        },
+                        "extra": {
+                          "rawValue": 1,
+                          "raw": "1"
+                        },
+                        "value": 1
+                      }
+                    },
+                    "alternate": {
+                      "type": "ExpressionStatement",
+                      "start": 29,
+                      "end": 31,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 29
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 31
+                        }
+                      },
+                      "expression": {
+                        "type": "NumericLiteral",
+                        "start": 29,
+                        "end": 30,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 29
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 30
+                          }
+                        },
+                        "extra": {
+                          "rawValue": 0,
+                          "raw": "0"
+                        },
+                        "value": 0
+                      }
+                    }
+                  }
+                ],
+                "directives": []
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-body/input.js
new file mode 100644
index 000000000000..c9562d43181c
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-body/input.js
@@ -0,0 +1,7 @@
+value |> do {
+  switch (number) {
+    case 0: #;
+    case 1: # + 1;
+    default: # + 10;
+  }
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-body/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-body/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-body/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-body/output.json
new file mode 100644
index 000000000000..f4e627647b9e
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-body/output.json
@@ -0,0 +1,419 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 94,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 7,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 94,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 7,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 94,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 7,
+            "column": 1
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 94,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 7,
+              "column": 1
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 94,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 7,
+                "column": 1
+              }
+            },
+            "expression": {
+              "type": "DoExpression",
+              "start": 9,
+              "end": 94,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 7,
+                  "column": 1
+                }
+              },
+              "body": {
+                "type": "BlockStatement",
+                "start": 12,
+                "end": 94,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 12
+                  },
+                  "end": {
+                    "line": 7,
+                    "column": 1
+                  }
+                },
+                "body": [
+                  {
+                    "type": "SwitchStatement",
+                    "start": 16,
+                    "end": 92,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 2
+                      },
+                      "end": {
+                        "line": 6,
+                        "column": 3
+                      }
+                    },
+                    "discriminant": {
+                      "type": "Identifier",
+                      "start": 24,
+                      "end": 30,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 10
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 16
+                        },
+                        "identifierName": "number"
+                      },
+                      "name": "number"
+                    },
+                    "cases": [
+                      {
+                        "type": "SwitchCase",
+                        "start": 38,
+                        "end": 48,
+                        "loc": {
+                          "start": {
+                            "line": 3,
+                            "column": 4
+                          },
+                          "end": {
+                            "line": 3,
+                            "column": 14
+                          }
+                        },
+                        "consequent": [
+                          {
+                            "type": "ExpressionStatement",
+                            "start": 46,
+                            "end": 48,
+                            "loc": {
+                              "start": {
+                                "line": 3,
+                                "column": 12
+                              },
+                              "end": {
+                                "line": 3,
+                                "column": 14
+                              }
+                            },
+                            "expression": {
+                              "type": "PrimaryTopicReference",
+                              "start": 46,
+                              "end": 47,
+                              "loc": {
+                                "start": {
+                                  "line": 3,
+                                  "column": 12
+                                },
+                                "end": {
+                                  "line": 3,
+                                  "column": 13
+                                }
+                              }
+                            }
+                          }
+                        ],
+                        "test": {
+                          "type": "NumericLiteral",
+                          "start": 43,
+                          "end": 44,
+                          "loc": {
+                            "start": {
+                              "line": 3,
+                              "column": 9
+                            },
+                            "end": {
+                              "line": 3,
+                              "column": 10
+                            }
+                          },
+                          "extra": {
+                            "rawValue": 0,
+                            "raw": "0"
+                          },
+                          "value": 0
+                        }
+                      },
+                      {
+                        "type": "SwitchCase",
+                        "start": 53,
+                        "end": 67,
+                        "loc": {
+                          "start": {
+                            "line": 4,
+                            "column": 4
+                          },
+                          "end": {
+                            "line": 4,
+                            "column": 18
+                          }
+                        },
+                        "consequent": [
+                          {
+                            "type": "ExpressionStatement",
+                            "start": 61,
+                            "end": 67,
+                            "loc": {
+                              "start": {
+                                "line": 4,
+                                "column": 12
+                              },
+                              "end": {
+                                "line": 4,
+                                "column": 18
+                              }
+                            },
+                            "expression": {
+                              "type": "BinaryExpression",
+                              "start": 61,
+                              "end": 66,
+                              "loc": {
+                                "start": {
+                                  "line": 4,
+                                  "column": 12
+                                },
+                                "end": {
+                                  "line": 4,
+                                  "column": 17
+                                }
+                              },
+                              "left": {
+                                "type": "PrimaryTopicReference",
+                                "start": 61,
+                                "end": 62,
+                                "loc": {
+                                  "start": {
+                                    "line": 4,
+                                    "column": 12
+                                  },
+                                  "end": {
+                                    "line": 4,
+                                    "column": 13
+                                  }
+                                }
+                              },
+                              "operator": "+",
+                              "right": {
+                                "type": "NumericLiteral",
+                                "start": 65,
+                                "end": 66,
+                                "loc": {
+                                  "start": {
+                                    "line": 4,
+                                    "column": 16
+                                  },
+                                  "end": {
+                                    "line": 4,
+                                    "column": 17
+                                  }
+                                },
+                                "extra": {
+                                  "rawValue": 1,
+                                  "raw": "1"
+                                },
+                                "value": 1
+                              }
+                            }
+                          }
+                        ],
+                        "test": {
+                          "type": "NumericLiteral",
+                          "start": 58,
+                          "end": 59,
+                          "loc": {
+                            "start": {
+                              "line": 4,
+                              "column": 9
+                            },
+                            "end": {
+                              "line": 4,
+                              "column": 10
+                            }
+                          },
+                          "extra": {
+                            "rawValue": 1,
+                            "raw": "1"
+                          },
+                          "value": 1
+                        }
+                      },
+                      {
+                        "type": "SwitchCase",
+                        "start": 72,
+                        "end": 88,
+                        "loc": {
+                          "start": {
+                            "line": 5,
+                            "column": 4
+                          },
+                          "end": {
+                            "line": 5,
+                            "column": 20
+                          }
+                        },
+                        "consequent": [
+                          {
+                            "type": "ExpressionStatement",
+                            "start": 81,
+                            "end": 88,
+                            "loc": {
+                              "start": {
+                                "line": 5,
+                                "column": 13
+                              },
+                              "end": {
+                                "line": 5,
+                                "column": 20
+                              }
+                            },
+                            "expression": {
+                              "type": "BinaryExpression",
+                              "start": 81,
+                              "end": 87,
+                              "loc": {
+                                "start": {
+                                  "line": 5,
+                                  "column": 13
+                                },
+                                "end": {
+                                  "line": 5,
+                                  "column": 19
+                                }
+                              },
+                              "left": {
+                                "type": "PrimaryTopicReference",
+                                "start": 81,
+                                "end": 82,
+                                "loc": {
+                                  "start": {
+                                    "line": 5,
+                                    "column": 13
+                                  },
+                                  "end": {
+                                    "line": 5,
+                                    "column": 14
+                                  }
+                                }
+                              },
+                              "operator": "+",
+                              "right": {
+                                "type": "NumericLiteral",
+                                "start": 85,
+                                "end": 87,
+                                "loc": {
+                                  "start": {
+                                    "line": 5,
+                                    "column": 17
+                                  },
+                                  "end": {
+                                    "line": 5,
+                                    "column": 19
+                                  }
+                                },
+                                "extra": {
+                                  "rawValue": 10,
+                                  "raw": "10"
+                                },
+                                "value": 10
+                              }
+                            }
+                          }
+                        ],
+                        "test": null
+                      }
+                    ]
+                  }
+                ],
+                "directives": []
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-head/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-head/input.js
new file mode 100644
index 000000000000..77e4a2ddcf2f
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-head/input.js
@@ -0,0 +1,7 @@
+value |> do {
+  switch (#) {
+    case 0: 50;
+    case 1: 60;
+    default: 70;
+  }
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-head/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-head/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-head/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-head/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-head/output.json
new file mode 100644
index 000000000000..c7c865a8e291
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-switch-statement,-outer-topic-reference-in-switch-head/output.json
@@ -0,0 +1,360 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 83,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 7,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 83,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 7,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 83,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 7,
+            "column": 1
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 83,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 7,
+              "column": 1
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 83,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 7,
+                "column": 1
+              }
+            },
+            "expression": {
+              "type": "DoExpression",
+              "start": 9,
+              "end": 83,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 7,
+                  "column": 1
+                }
+              },
+              "body": {
+                "type": "BlockStatement",
+                "start": 12,
+                "end": 83,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 12
+                  },
+                  "end": {
+                    "line": 7,
+                    "column": 1
+                  }
+                },
+                "body": [
+                  {
+                    "type": "SwitchStatement",
+                    "start": 16,
+                    "end": 81,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 2
+                      },
+                      "end": {
+                        "line": 6,
+                        "column": 3
+                      }
+                    },
+                    "discriminant": {
+                      "type": "PrimaryTopicReference",
+                      "start": 24,
+                      "end": 25,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 10
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 11
+                        }
+                      }
+                    },
+                    "cases": [
+                      {
+                        "type": "SwitchCase",
+                        "start": 33,
+                        "end": 44,
+                        "loc": {
+                          "start": {
+                            "line": 3,
+                            "column": 4
+                          },
+                          "end": {
+                            "line": 3,
+                            "column": 15
+                          }
+                        },
+                        "consequent": [
+                          {
+                            "type": "ExpressionStatement",
+                            "start": 41,
+                            "end": 44,
+                            "loc": {
+                              "start": {
+                                "line": 3,
+                                "column": 12
+                              },
+                              "end": {
+                                "line": 3,
+                                "column": 15
+                              }
+                            },
+                            "expression": {
+                              "type": "NumericLiteral",
+                              "start": 41,
+                              "end": 43,
+                              "loc": {
+                                "start": {
+                                  "line": 3,
+                                  "column": 12
+                                },
+                                "end": {
+                                  "line": 3,
+                                  "column": 14
+                                }
+                              },
+                              "extra": {
+                                "rawValue": 50,
+                                "raw": "50"
+                              },
+                              "value": 50
+                            }
+                          }
+                        ],
+                        "test": {
+                          "type": "NumericLiteral",
+                          "start": 38,
+                          "end": 39,
+                          "loc": {
+                            "start": {
+                              "line": 3,
+                              "column": 9
+                            },
+                            "end": {
+                              "line": 3,
+                              "column": 10
+                            }
+                          },
+                          "extra": {
+                            "rawValue": 0,
+                            "raw": "0"
+                          },
+                          "value": 0
+                        }
+                      },
+                      {
+                        "type": "SwitchCase",
+                        "start": 49,
+                        "end": 60,
+                        "loc": {
+                          "start": {
+                            "line": 4,
+                            "column": 4
+                          },
+                          "end": {
+                            "line": 4,
+                            "column": 15
+                          }
+                        },
+                        "consequent": [
+                          {
+                            "type": "ExpressionStatement",
+                            "start": 57,
+                            "end": 60,
+                            "loc": {
+                              "start": {
+                                "line": 4,
+                                "column": 12
+                              },
+                              "end": {
+                                "line": 4,
+                                "column": 15
+                              }
+                            },
+                            "expression": {
+                              "type": "NumericLiteral",
+                              "start": 57,
+                              "end": 59,
+                              "loc": {
+                                "start": {
+                                  "line": 4,
+                                  "column": 12
+                                },
+                                "end": {
+                                  "line": 4,
+                                  "column": 14
+                                }
+                              },
+                              "extra": {
+                                "rawValue": 60,
+                                "raw": "60"
+                              },
+                              "value": 60
+                            }
+                          }
+                        ],
+                        "test": {
+                          "type": "NumericLiteral",
+                          "start": 54,
+                          "end": 55,
+                          "loc": {
+                            "start": {
+                              "line": 4,
+                              "column": 9
+                            },
+                            "end": {
+                              "line": 4,
+                              "column": 10
+                            }
+                          },
+                          "extra": {
+                            "rawValue": 1,
+                            "raw": "1"
+                          },
+                          "value": 1
+                        }
+                      },
+                      {
+                        "type": "SwitchCase",
+                        "start": 65,
+                        "end": 77,
+                        "loc": {
+                          "start": {
+                            "line": 5,
+                            "column": 4
+                          },
+                          "end": {
+                            "line": 5,
+                            "column": 16
+                          }
+                        },
+                        "consequent": [
+                          {
+                            "type": "ExpressionStatement",
+                            "start": 74,
+                            "end": 77,
+                            "loc": {
+                              "start": {
+                                "line": 5,
+                                "column": 13
+                              },
+                              "end": {
+                                "line": 5,
+                                "column": 16
+                              }
+                            },
+                            "expression": {
+                              "type": "NumericLiteral",
+                              "start": 74,
+                              "end": 76,
+                              "loc": {
+                                "start": {
+                                  "line": 5,
+                                  "column": 13
+                                },
+                                "end": {
+                                  "line": 5,
+                                  "column": 15
+                                }
+                              },
+                              "extra": {
+                                "rawValue": 70,
+                                "raw": "70"
+                              },
+                              "value": 70
+                            }
+                          }
+                        ],
+                        "test": null
+                      }
+                    ]
+                  }
+                ],
+                "directives": []
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-finally-clause-with-catch-and-finally/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-finally-clause-with-catch-and-finally/input.js
new file mode 100644
index 000000000000..46ec28c2e777
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-finally-clause-with-catch-and-finally/input.js
@@ -0,0 +1,5 @@
+value |> do {
+  try { JSON.parse(whatever); }
+  catch (error) { console.error(error); }
+  finally { something(#); }
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-finally-clause-with-catch-and-finally/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-finally-clause-with-catch-and-finally/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-finally-clause-with-catch-and-finally/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-finally-clause-with-catch-and-finally/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-finally-clause-with-catch-and-finally/output.json
new file mode 100644
index 000000000000..07af94d070ab
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-finally-clause-with-catch-and-finally/output.json
@@ -0,0 +1,495 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 117,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 5,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 117,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 5,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 117,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 5,
+            "column": 1
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 117,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 5,
+              "column": 1
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 117,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 5,
+                "column": 1
+              }
+            },
+            "expression": {
+              "type": "DoExpression",
+              "start": 9,
+              "end": 117,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 5,
+                  "column": 1
+                }
+              },
+              "body": {
+                "type": "BlockStatement",
+                "start": 12,
+                "end": 117,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 12
+                  },
+                  "end": {
+                    "line": 5,
+                    "column": 1
+                  }
+                },
+                "body": [
+                  {
+                    "type": "TryStatement",
+                    "start": 16,
+                    "end": 115,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 2
+                      },
+                      "end": {
+                        "line": 4,
+                        "column": 27
+                      }
+                    },
+                    "block": {
+                      "type": "BlockStatement",
+                      "start": 20,
+                      "end": 45,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 6
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 31
+                        }
+                      },
+                      "body": [
+                        {
+                          "type": "ExpressionStatement",
+                          "start": 22,
+                          "end": 43,
+                          "loc": {
+                            "start": {
+                              "line": 2,
+                              "column": 8
+                            },
+                            "end": {
+                              "line": 2,
+                              "column": 29
+                            }
+                          },
+                          "expression": {
+                            "type": "CallExpression",
+                            "start": 22,
+                            "end": 42,
+                            "loc": {
+                              "start": {
+                                "line": 2,
+                                "column": 8
+                              },
+                              "end": {
+                                "line": 2,
+                                "column": 28
+                              }
+                            },
+                            "callee": {
+                              "type": "MemberExpression",
+                              "start": 22,
+                              "end": 32,
+                              "loc": {
+                                "start": {
+                                  "line": 2,
+                                  "column": 8
+                                },
+                                "end": {
+                                  "line": 2,
+                                  "column": 18
+                                }
+                              },
+                              "object": {
+                                "type": "Identifier",
+                                "start": 22,
+                                "end": 26,
+                                "loc": {
+                                  "start": {
+                                    "line": 2,
+                                    "column": 8
+                                  },
+                                  "end": {
+                                    "line": 2,
+                                    "column": 12
+                                  },
+                                  "identifierName": "JSON"
+                                },
+                                "name": "JSON"
+                              },
+                              "property": {
+                                "type": "Identifier",
+                                "start": 27,
+                                "end": 32,
+                                "loc": {
+                                  "start": {
+                                    "line": 2,
+                                    "column": 13
+                                  },
+                                  "end": {
+                                    "line": 2,
+                                    "column": 18
+                                  },
+                                  "identifierName": "parse"
+                                },
+                                "name": "parse"
+                              },
+                              "computed": false
+                            },
+                            "arguments": [
+                              {
+                                "type": "Identifier",
+                                "start": 33,
+                                "end": 41,
+                                "loc": {
+                                  "start": {
+                                    "line": 2,
+                                    "column": 19
+                                  },
+                                  "end": {
+                                    "line": 2,
+                                    "column": 27
+                                  },
+                                  "identifierName": "whatever"
+                                },
+                                "name": "whatever"
+                              }
+                            ]
+                          }
+                        }
+                      ],
+                      "directives": []
+                    },
+                    "handler": {
+                      "type": "CatchClause",
+                      "start": 48,
+                      "end": 87,
+                      "loc": {
+                        "start": {
+                          "line": 3,
+                          "column": 2
+                        },
+                        "end": {
+                          "line": 3,
+                          "column": 41
+                        }
+                      },
+                      "param": {
+                        "type": "Identifier",
+                        "start": 55,
+                        "end": 60,
+                        "loc": {
+                          "start": {
+                            "line": 3,
+                            "column": 9
+                          },
+                          "end": {
+                            "line": 3,
+                            "column": 14
+                          },
+                          "identifierName": "error"
+                        },
+                        "name": "error"
+                      },
+                      "body": {
+                        "type": "BlockStatement",
+                        "start": 62,
+                        "end": 87,
+                        "loc": {
+                          "start": {
+                            "line": 3,
+                            "column": 16
+                          },
+                          "end": {
+                            "line": 3,
+                            "column": 41
+                          }
+                        },
+                        "body": [
+                          {
+                            "type": "ExpressionStatement",
+                            "start": 64,
+                            "end": 85,
+                            "loc": {
+                              "start": {
+                                "line": 3,
+                                "column": 18
+                              },
+                              "end": {
+                                "line": 3,
+                                "column": 39
+                              }
+                            },
+                            "expression": {
+                              "type": "CallExpression",
+                              "start": 64,
+                              "end": 84,
+                              "loc": {
+                                "start": {
+                                  "line": 3,
+                                  "column": 18
+                                },
+                                "end": {
+                                  "line": 3,
+                                  "column": 38
+                                }
+                              },
+                              "callee": {
+                                "type": "MemberExpression",
+                                "start": 64,
+                                "end": 77,
+                                "loc": {
+                                  "start": {
+                                    "line": 3,
+                                    "column": 18
+                                  },
+                                  "end": {
+                                    "line": 3,
+                                    "column": 31
+                                  }
+                                },
+                                "object": {
+                                  "type": "Identifier",
+                                  "start": 64,
+                                  "end": 71,
+                                  "loc": {
+                                    "start": {
+                                      "line": 3,
+                                      "column": 18
+                                    },
+                                    "end": {
+                                      "line": 3,
+                                      "column": 25
+                                    },
+                                    "identifierName": "console"
+                                  },
+                                  "name": "console"
+                                },
+                                "property": {
+                                  "type": "Identifier",
+                                  "start": 72,
+                                  "end": 77,
+                                  "loc": {
+                                    "start": {
+                                      "line": 3,
+                                      "column": 26
+                                    },
+                                    "end": {
+                                      "line": 3,
+                                      "column": 31
+                                    },
+                                    "identifierName": "error"
+                                  },
+                                  "name": "error"
+                                },
+                                "computed": false
+                              },
+                              "arguments": [
+                                {
+                                  "type": "Identifier",
+                                  "start": 78,
+                                  "end": 83,
+                                  "loc": {
+                                    "start": {
+                                      "line": 3,
+                                      "column": 32
+                                    },
+                                    "end": {
+                                      "line": 3,
+                                      "column": 37
+                                    },
+                                    "identifierName": "error"
+                                  },
+                                  "name": "error"
+                                }
+                              ]
+                            }
+                          }
+                        ],
+                        "directives": []
+                      }
+                    },
+                    "guardedHandlers": [],
+                    "finalizer": {
+                      "type": "BlockStatement",
+                      "start": 98,
+                      "end": 115,
+                      "loc": {
+                        "start": {
+                          "line": 4,
+                          "column": 10
+                        },
+                        "end": {
+                          "line": 4,
+                          "column": 27
+                        }
+                      },
+                      "body": [
+                        {
+                          "type": "ExpressionStatement",
+                          "start": 100,
+                          "end": 113,
+                          "loc": {
+                            "start": {
+                              "line": 4,
+                              "column": 12
+                            },
+                            "end": {
+                              "line": 4,
+                              "column": 25
+                            }
+                          },
+                          "expression": {
+                            "type": "CallExpression",
+                            "start": 100,
+                            "end": 112,
+                            "loc": {
+                              "start": {
+                                "line": 4,
+                                "column": 12
+                              },
+                              "end": {
+                                "line": 4,
+                                "column": 24
+                              }
+                            },
+                            "callee": {
+                              "type": "Identifier",
+                              "start": 100,
+                              "end": 109,
+                              "loc": {
+                                "start": {
+                                  "line": 4,
+                                  "column": 12
+                                },
+                                "end": {
+                                  "line": 4,
+                                  "column": 21
+                                },
+                                "identifierName": "something"
+                              },
+                              "name": "something"
+                            },
+                            "arguments": [
+                              {
+                                "type": "PrimaryTopicReference",
+                                "start": 110,
+                                "end": 111,
+                                "loc": {
+                                  "start": {
+                                    "line": 4,
+                                    "column": 22
+                                  },
+                                  "end": {
+                                    "line": 4,
+                                    "column": 23
+                                  }
+                                }
+                              }
+                            ]
+                          }
+                        }
+                      ],
+                      "directives": []
+                    }
+                  }
+                ],
+                "directives": []
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch-and-finally/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch-and-finally/input.js
new file mode 100644
index 000000000000..dd034b608161
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch-and-finally/input.js
@@ -0,0 +1,5 @@
+value |> do {
+  try { JSON.parse(#); }
+  catch (error) { console.error(error); }
+  finally { something(); }
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch-and-finally/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch-and-finally/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch-and-finally/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch-and-finally/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch-and-finally/output.json
new file mode 100644
index 000000000000..c9b09e909864
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch-and-finally/output.json
@@ -0,0 +1,477 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 109,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 5,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 109,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 5,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 109,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 5,
+            "column": 1
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 109,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 5,
+              "column": 1
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 109,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 5,
+                "column": 1
+              }
+            },
+            "expression": {
+              "type": "DoExpression",
+              "start": 9,
+              "end": 109,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 5,
+                  "column": 1
+                }
+              },
+              "body": {
+                "type": "BlockStatement",
+                "start": 12,
+                "end": 109,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 12
+                  },
+                  "end": {
+                    "line": 5,
+                    "column": 1
+                  }
+                },
+                "body": [
+                  {
+                    "type": "TryStatement",
+                    "start": 16,
+                    "end": 107,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 2
+                      },
+                      "end": {
+                        "line": 4,
+                        "column": 26
+                      }
+                    },
+                    "block": {
+                      "type": "BlockStatement",
+                      "start": 20,
+                      "end": 38,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 6
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 24
+                        }
+                      },
+                      "body": [
+                        {
+                          "type": "ExpressionStatement",
+                          "start": 22,
+                          "end": 36,
+                          "loc": {
+                            "start": {
+                              "line": 2,
+                              "column": 8
+                            },
+                            "end": {
+                              "line": 2,
+                              "column": 22
+                            }
+                          },
+                          "expression": {
+                            "type": "CallExpression",
+                            "start": 22,
+                            "end": 35,
+                            "loc": {
+                              "start": {
+                                "line": 2,
+                                "column": 8
+                              },
+                              "end": {
+                                "line": 2,
+                                "column": 21
+                              }
+                            },
+                            "callee": {
+                              "type": "MemberExpression",
+                              "start": 22,
+                              "end": 32,
+                              "loc": {
+                                "start": {
+                                  "line": 2,
+                                  "column": 8
+                                },
+                                "end": {
+                                  "line": 2,
+                                  "column": 18
+                                }
+                              },
+                              "object": {
+                                "type": "Identifier",
+                                "start": 22,
+                                "end": 26,
+                                "loc": {
+                                  "start": {
+                                    "line": 2,
+                                    "column": 8
+                                  },
+                                  "end": {
+                                    "line": 2,
+                                    "column": 12
+                                  },
+                                  "identifierName": "JSON"
+                                },
+                                "name": "JSON"
+                              },
+                              "property": {
+                                "type": "Identifier",
+                                "start": 27,
+                                "end": 32,
+                                "loc": {
+                                  "start": {
+                                    "line": 2,
+                                    "column": 13
+                                  },
+                                  "end": {
+                                    "line": 2,
+                                    "column": 18
+                                  },
+                                  "identifierName": "parse"
+                                },
+                                "name": "parse"
+                              },
+                              "computed": false
+                            },
+                            "arguments": [
+                              {
+                                "type": "PrimaryTopicReference",
+                                "start": 33,
+                                "end": 34,
+                                "loc": {
+                                  "start": {
+                                    "line": 2,
+                                    "column": 19
+                                  },
+                                  "end": {
+                                    "line": 2,
+                                    "column": 20
+                                  }
+                                }
+                              }
+                            ]
+                          }
+                        }
+                      ],
+                      "directives": []
+                    },
+                    "handler": {
+                      "type": "CatchClause",
+                      "start": 41,
+                      "end": 80,
+                      "loc": {
+                        "start": {
+                          "line": 3,
+                          "column": 2
+                        },
+                        "end": {
+                          "line": 3,
+                          "column": 41
+                        }
+                      },
+                      "param": {
+                        "type": "Identifier",
+                        "start": 48,
+                        "end": 53,
+                        "loc": {
+                          "start": {
+                            "line": 3,
+                            "column": 9
+                          },
+                          "end": {
+                            "line": 3,
+                            "column": 14
+                          },
+                          "identifierName": "error"
+                        },
+                        "name": "error"
+                      },
+                      "body": {
+                        "type": "BlockStatement",
+                        "start": 55,
+                        "end": 80,
+                        "loc": {
+                          "start": {
+                            "line": 3,
+                            "column": 16
+                          },
+                          "end": {
+                            "line": 3,
+                            "column": 41
+                          }
+                        },
+                        "body": [
+                          {
+                            "type": "ExpressionStatement",
+                            "start": 57,
+                            "end": 78,
+                            "loc": {
+                              "start": {
+                                "line": 3,
+                                "column": 18
+                              },
+                              "end": {
+                                "line": 3,
+                                "column": 39
+                              }
+                            },
+                            "expression": {
+                              "type": "CallExpression",
+                              "start": 57,
+                              "end": 77,
+                              "loc": {
+                                "start": {
+                                  "line": 3,
+                                  "column": 18
+                                },
+                                "end": {
+                                  "line": 3,
+                                  "column": 38
+                                }
+                              },
+                              "callee": {
+                                "type": "MemberExpression",
+                                "start": 57,
+                                "end": 70,
+                                "loc": {
+                                  "start": {
+                                    "line": 3,
+                                    "column": 18
+                                  },
+                                  "end": {
+                                    "line": 3,
+                                    "column": 31
+                                  }
+                                },
+                                "object": {
+                                  "type": "Identifier",
+                                  "start": 57,
+                                  "end": 64,
+                                  "loc": {
+                                    "start": {
+                                      "line": 3,
+                                      "column": 18
+                                    },
+                                    "end": {
+                                      "line": 3,
+                                      "column": 25
+                                    },
+                                    "identifierName": "console"
+                                  },
+                                  "name": "console"
+                                },
+                                "property": {
+                                  "type": "Identifier",
+                                  "start": 65,
+                                  "end": 70,
+                                  "loc": {
+                                    "start": {
+                                      "line": 3,
+                                      "column": 26
+                                    },
+                                    "end": {
+                                      "line": 3,
+                                      "column": 31
+                                    },
+                                    "identifierName": "error"
+                                  },
+                                  "name": "error"
+                                },
+                                "computed": false
+                              },
+                              "arguments": [
+                                {
+                                  "type": "Identifier",
+                                  "start": 71,
+                                  "end": 76,
+                                  "loc": {
+                                    "start": {
+                                      "line": 3,
+                                      "column": 32
+                                    },
+                                    "end": {
+                                      "line": 3,
+                                      "column": 37
+                                    },
+                                    "identifierName": "error"
+                                  },
+                                  "name": "error"
+                                }
+                              ]
+                            }
+                          }
+                        ],
+                        "directives": []
+                      }
+                    },
+                    "guardedHandlers": [],
+                    "finalizer": {
+                      "type": "BlockStatement",
+                      "start": 91,
+                      "end": 107,
+                      "loc": {
+                        "start": {
+                          "line": 4,
+                          "column": 10
+                        },
+                        "end": {
+                          "line": 4,
+                          "column": 26
+                        }
+                      },
+                      "body": [
+                        {
+                          "type": "ExpressionStatement",
+                          "start": 93,
+                          "end": 105,
+                          "loc": {
+                            "start": {
+                              "line": 4,
+                              "column": 12
+                            },
+                            "end": {
+                              "line": 4,
+                              "column": 24
+                            }
+                          },
+                          "expression": {
+                            "type": "CallExpression",
+                            "start": 93,
+                            "end": 104,
+                            "loc": {
+                              "start": {
+                                "line": 4,
+                                "column": 12
+                              },
+                              "end": {
+                                "line": 4,
+                                "column": 23
+                              }
+                            },
+                            "callee": {
+                              "type": "Identifier",
+                              "start": 93,
+                              "end": 102,
+                              "loc": {
+                                "start": {
+                                  "line": 4,
+                                  "column": 12
+                                },
+                                "end": {
+                                  "line": 4,
+                                  "column": 21
+                                },
+                                "identifierName": "something"
+                              },
+                              "name": "something"
+                            },
+                            "arguments": []
+                          }
+                        }
+                      ],
+                      "directives": []
+                    }
+                  }
+                ],
+                "directives": []
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch/input.js
new file mode 100644
index 000000000000..70eb5263f217
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch/input.js
@@ -0,0 +1,4 @@
+value |> do {
+  try { JSON.parse(#); }
+  catch (error) { console.error(error); }
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch/output.json
new file mode 100644
index 000000000000..976398843dd9
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-try-statement,-outer-topic-reference-in-try-clause-with-catch/output.json
@@ -0,0 +1,412 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 82,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 4,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 82,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 4,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 82,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 4,
+            "column": 1
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 82,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 4,
+              "column": 1
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 82,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 4,
+                "column": 1
+              }
+            },
+            "expression": {
+              "type": "DoExpression",
+              "start": 9,
+              "end": 82,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 4,
+                  "column": 1
+                }
+              },
+              "body": {
+                "type": "BlockStatement",
+                "start": 12,
+                "end": 82,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 12
+                  },
+                  "end": {
+                    "line": 4,
+                    "column": 1
+                  }
+                },
+                "body": [
+                  {
+                    "type": "TryStatement",
+                    "start": 16,
+                    "end": 80,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 2
+                      },
+                      "end": {
+                        "line": 3,
+                        "column": 41
+                      }
+                    },
+                    "block": {
+                      "type": "BlockStatement",
+                      "start": 20,
+                      "end": 38,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 6
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 24
+                        }
+                      },
+                      "body": [
+                        {
+                          "type": "ExpressionStatement",
+                          "start": 22,
+                          "end": 36,
+                          "loc": {
+                            "start": {
+                              "line": 2,
+                              "column": 8
+                            },
+                            "end": {
+                              "line": 2,
+                              "column": 22
+                            }
+                          },
+                          "expression": {
+                            "type": "CallExpression",
+                            "start": 22,
+                            "end": 35,
+                            "loc": {
+                              "start": {
+                                "line": 2,
+                                "column": 8
+                              },
+                              "end": {
+                                "line": 2,
+                                "column": 21
+                              }
+                            },
+                            "callee": {
+                              "type": "MemberExpression",
+                              "start": 22,
+                              "end": 32,
+                              "loc": {
+                                "start": {
+                                  "line": 2,
+                                  "column": 8
+                                },
+                                "end": {
+                                  "line": 2,
+                                  "column": 18
+                                }
+                              },
+                              "object": {
+                                "type": "Identifier",
+                                "start": 22,
+                                "end": 26,
+                                "loc": {
+                                  "start": {
+                                    "line": 2,
+                                    "column": 8
+                                  },
+                                  "end": {
+                                    "line": 2,
+                                    "column": 12
+                                  },
+                                  "identifierName": "JSON"
+                                },
+                                "name": "JSON"
+                              },
+                              "property": {
+                                "type": "Identifier",
+                                "start": 27,
+                                "end": 32,
+                                "loc": {
+                                  "start": {
+                                    "line": 2,
+                                    "column": 13
+                                  },
+                                  "end": {
+                                    "line": 2,
+                                    "column": 18
+                                  },
+                                  "identifierName": "parse"
+                                },
+                                "name": "parse"
+                              },
+                              "computed": false
+                            },
+                            "arguments": [
+                              {
+                                "type": "PrimaryTopicReference",
+                                "start": 33,
+                                "end": 34,
+                                "loc": {
+                                  "start": {
+                                    "line": 2,
+                                    "column": 19
+                                  },
+                                  "end": {
+                                    "line": 2,
+                                    "column": 20
+                                  }
+                                }
+                              }
+                            ]
+                          }
+                        }
+                      ],
+                      "directives": []
+                    },
+                    "handler": {
+                      "type": "CatchClause",
+                      "start": 41,
+                      "end": 80,
+                      "loc": {
+                        "start": {
+                          "line": 3,
+                          "column": 2
+                        },
+                        "end": {
+                          "line": 3,
+                          "column": 41
+                        }
+                      },
+                      "param": {
+                        "type": "Identifier",
+                        "start": 48,
+                        "end": 53,
+                        "loc": {
+                          "start": {
+                            "line": 3,
+                            "column": 9
+                          },
+                          "end": {
+                            "line": 3,
+                            "column": 14
+                          },
+                          "identifierName": "error"
+                        },
+                        "name": "error"
+                      },
+                      "body": {
+                        "type": "BlockStatement",
+                        "start": 55,
+                        "end": 80,
+                        "loc": {
+                          "start": {
+                            "line": 3,
+                            "column": 16
+                          },
+                          "end": {
+                            "line": 3,
+                            "column": 41
+                          }
+                        },
+                        "body": [
+                          {
+                            "type": "ExpressionStatement",
+                            "start": 57,
+                            "end": 78,
+                            "loc": {
+                              "start": {
+                                "line": 3,
+                                "column": 18
+                              },
+                              "end": {
+                                "line": 3,
+                                "column": 39
+                              }
+                            },
+                            "expression": {
+                              "type": "CallExpression",
+                              "start": 57,
+                              "end": 77,
+                              "loc": {
+                                "start": {
+                                  "line": 3,
+                                  "column": 18
+                                },
+                                "end": {
+                                  "line": 3,
+                                  "column": 38
+                                }
+                              },
+                              "callee": {
+                                "type": "MemberExpression",
+                                "start": 57,
+                                "end": 70,
+                                "loc": {
+                                  "start": {
+                                    "line": 3,
+                                    "column": 18
+                                  },
+                                  "end": {
+                                    "line": 3,
+                                    "column": 31
+                                  }
+                                },
+                                "object": {
+                                  "type": "Identifier",
+                                  "start": 57,
+                                  "end": 64,
+                                  "loc": {
+                                    "start": {
+                                      "line": 3,
+                                      "column": 18
+                                    },
+                                    "end": {
+                                      "line": 3,
+                                      "column": 25
+                                    },
+                                    "identifierName": "console"
+                                  },
+                                  "name": "console"
+                                },
+                                "property": {
+                                  "type": "Identifier",
+                                  "start": 65,
+                                  "end": 70,
+                                  "loc": {
+                                    "start": {
+                                      "line": 3,
+                                      "column": 26
+                                    },
+                                    "end": {
+                                      "line": 3,
+                                      "column": 31
+                                    },
+                                    "identifierName": "error"
+                                  },
+                                  "name": "error"
+                                },
+                                "computed": false
+                              },
+                              "arguments": [
+                                {
+                                  "type": "Identifier",
+                                  "start": 71,
+                                  "end": 76,
+                                  "loc": {
+                                    "start": {
+                                      "line": 3,
+                                      "column": 32
+                                    },
+                                    "end": {
+                                      "line": 3,
+                                      "column": 37
+                                    },
+                                    "identifierName": "error"
+                                  },
+                                  "name": "error"
+                                }
+                              ]
+                            }
+                          }
+                        ],
+                        "directives": []
+                      }
+                    },
+                    "guardedHandlers": [],
+                    "finalizer": null
+                  }
+                ],
+                "directives": []
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-while-loop,-outer-topic-reference-in-loop-head/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-while-loop,-outer-topic-reference-in-loop-head/input.js
new file mode 100644
index 000000000000..be802107159e
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-while-loop,-outer-topic-reference-in-loop-head/input.js
@@ -0,0 +1 @@
+value |> do { while (x < #) x += 1; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-while-loop,-outer-topic-reference-in-loop-head/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-while-loop,-outer-topic-reference-in-loop-head/options.json
new file mode 100644
index 000000000000..edb7679c6a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-while-loop,-outer-topic-reference-in-loop-head/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-while-loop,-outer-topic-reference-in-loop-head/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-while-loop,-outer-topic-reference-in-loop-head/output.json
new file mode 100644
index 000000000000..6c5dbb28a304
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-do-expression,-while-loop,-outer-topic-reference-in-loop-head/output.json
@@ -0,0 +1,262 @@
+{
+  "type": "File",
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+                        "end": 22,
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+                            "column": 22
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+                        },
+                        "name": "x"
+                      },
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+                        "start": 25,
+                        "end": 26,
+                        "loc": {
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+                            "column": 34
+                          }
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+                        "left": {
+                          "type": "Identifier",
+                          "start": 28,
+                          "end": 29,
+                          "loc": {
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+                              "line": 1,
+                              "column": 28
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 29
+                            },
+                            "identifierName": "x"
+                          },
+                          "name": "x"
+                        },
+                        "right": {
+                          "type": "NumericLiteral",
+                          "start": 33,
+                          "end": 34,
+                          "loc": {
+                            "start": {
+                              "line": 1,
+                              "column": 33
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 34
+                            }
+                          },
+                          "extra": {
+                            "rawValue": 1,
+                            "raw": "1"
+                          },
+                          "value": 1
+                        }
+                      }
+                    }
+                  }
+                ],
+                "directives": []
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-call,-identifier-with-topic-reference/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-call,-identifier-with-topic-reference/input.js
new file mode 100644
index 000000000000..e8678f6a2bb1
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-call,-identifier-with-topic-reference/input.js
@@ -0,0 +1 @@
+value |> f(#)
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-call,-identifier-with-topic-reference/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-call,-identifier-with-topic-reference/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-call,-identifier-with-topic-reference/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-call,-identifier-with-topic-reference/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-call,-identifier-with-topic-reference/output.json
new file mode 100644
index 000000000000..3c4b198f1d9c
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-call,-identifier-with-topic-reference/output.json
@@ -0,0 +1,147 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 13,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 13
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 13,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 13
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 13,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 13
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 13,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 13
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 13,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 1,
+                "column": 13
+              }
+            },
+            "expression": {
+              "type": "CallExpression",
+              "start": 9,
+              "end": 13,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 13
+                }
+              },
+              "callee": {
+                "type": "Identifier",
+                "start": 9,
+                "end": 10,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 9
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 10
+                  },
+                  "identifierName": "f"
+                },
+                "name": "f"
+              },
+              "arguments": [
+                {
+                  "type": "PrimaryTopicReference",
+                  "start": 11,
+                  "end": 12,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 11
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 12
+                    }
+                  }
+                }
+              ]
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-definition,-outer-topic-reference-in-default-parameter-expression/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-definition,-outer-topic-reference-in-default-parameter-expression/input.js
new file mode 100644
index 000000000000..432d1c9ed8c7
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-definition,-outer-topic-reference-in-default-parameter-expression/input.js
@@ -0,0 +1 @@
+value |> function (x = #) { return x; }
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-definition,-outer-topic-reference-in-default-parameter-expression/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-definition,-outer-topic-reference-in-default-parameter-expression/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-definition,-outer-topic-reference-in-default-parameter-expression/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-definition,-outer-topic-reference-in-default-parameter-expression/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-definition,-outer-topic-reference-in-default-parameter-expression/output.json
new file mode 100644
index 000000000000..6aea657b9d0c
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-function-definition,-outer-topic-reference-in-default-parameter-expression/output.json
@@ -0,0 +1,215 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 39,
+  "loc": {
+    "start": {
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+      "column": 0
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+      "column": 39
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 39,
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+              },
+              "identifierName": "value"
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+          "operator": "|>",
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+            "end": 39,
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+                }
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+              "async": false,
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+                      },
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+                    "line": 1,
+                    "column": 39
+                  }
+                },
+                "body": [
+                  {
+                    "type": "ReturnStatement",
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+                    "end": 37,
+                    "loc": {
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+                        "line": 1,
+                        "column": 28
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+                        "line": 1,
+                        "column": 37
+                      }
+                    },
+                    "argument": {
+                      "type": "Identifier",
+                      "start": 35,
+                      "end": 36,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 35
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 36
+                        },
+                        "identifierName": "x"
+                      },
+                      "name": "x"
+                    }
+                  }
+                ],
+                "directives": []
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-parenthesized/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-parenthesized/input.js
new file mode 100644
index 000000000000..a7abc2dc18f7
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-parenthesized/input.js
@@ -0,0 +1 @@
+value |> (#)
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-parenthesized/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-parenthesized/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-parenthesized/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-parenthesized/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-parenthesized/output.json
new file mode 100644
index 000000000000..e3c00951e0ca
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-parenthesized/output.json
@@ -0,0 +1,117 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 12,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 12
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 12,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 12
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 12,
+        "loc": {
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+          },
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+          }
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+              "column": 12
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 12,
+            "loc": {
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+                "column": 9
+              },
+              "end": {
+                "line": 1,
+                "column": 12
+              }
+            },
+            "expression": {
+              "type": "PrimaryTopicReference",
+              "start": 10,
+              "end": 11,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 10
+                },
+                "end": {
+                  "line": 1,
+                  "column": 11
+                }
+              },
+              "extra": {
+                "parenthesized": true,
+                "parenStart": 9
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-unparenthesized/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-unparenthesized/input.js
new file mode 100644
index 000000000000..a18cbd0f1bb2
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-unparenthesized/input.js
@@ -0,0 +1 @@
+value |> #
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-unparenthesized/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-unparenthesized/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-unparenthesized/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-unparenthesized/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-unparenthesized/output.json
new file mode 100644
index 000000000000..24779f851b61
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-identity,-unparenthesized/output.json
@@ -0,0 +1,113 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 10,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 10
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 10,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 10
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 10,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 10
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 10,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 10
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 10,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 1,
+                "column": 10
+              }
+            },
+            "expression": {
+              "type": "PrimaryTopicReference",
+              "start": 9,
+              "end": 10,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 10
+                }
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-mixed-pipeline-plugins/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-mixed-pipeline-plugins/input.js
new file mode 100644
index 000000000000..a18cbd0f1bb2
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-mixed-pipeline-plugins/input.js
@@ -0,0 +1 @@
+value |> #
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-mixed-pipeline-plugins/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-mixed-pipeline-plugins/options.json
new file mode 100644
index 000000000000..887155e27e68
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-mixed-pipeline-plugins/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "pipelineOperator"]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-mixed-pipeline-plugins/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-mixed-pipeline-plugins/output.json
new file mode 100644
index 000000000000..24779f851b61
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-mixed-pipeline-plugins/output.json
@@ -0,0 +1,113 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 10,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 10
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 10,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 10
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 10,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 10
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 10,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 10
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 10,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 1,
+                "column": 10
+              }
+            },
+            "expression": {
+              "type": "PrimaryTopicReference",
+              "start": 9,
+              "end": 10,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 10
+                }
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-parenthesized-single-line-arrow-function,-with-empty-parameter-list-and-bare-addition-body/input.js b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-parenthesized-single-line-arrow-function,-with-empty-parameter-list-and-bare-addition-body/input.js
new file mode 100644
index 000000000000..7f3f814efd71
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-parenthesized-single-line-arrow-function,-with-empty-parameter-list-and-bare-addition-body/input.js
@@ -0,0 +1 @@
+value |> (() => # + 1)
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-parenthesized-single-line-arrow-function,-with-empty-parameter-list-and-bare-addition-body/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-parenthesized-single-line-arrow-function,-with-empty-parameter-list-and-bare-addition-body/options.json
new file mode 100644
index 000000000000..17e4e327bbad
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-parenthesized-single-line-arrow-function,-with-empty-parameter-list-and-bare-addition-body/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }]]
+}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-parenthesized-single-line-arrow-function,-with-empty-parameter-list-and-bare-addition-body/output.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-parenthesized-single-line-arrow-function,-with-empty-parameter-list-and-bare-addition-body/output.json
new file mode 100644
index 000000000000..6d82768d86bc
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-smart-topic-style,-parenthesized-single-line-arrow-function,-with-empty-parameter-list-and-bare-addition-body/output.json
@@ -0,0 +1,172 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 22,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 22
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 22,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 22
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 22,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 22
+          }
+        },
+        "expression": {
+          "type": "BinaryExpression",
+          "start": 0,
+          "end": 22,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 22
+            }
+          },
+          "left": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 5,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 5
+              },
+              "identifierName": "value"
+            },
+            "name": "value"
+          },
+          "operator": "|>",
+          "right": {
+            "type": "PipelineTopicExpression",
+            "start": 9,
+            "end": 22,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 9
+              },
+              "end": {
+                "line": 1,
+                "column": 22
+              }
+            },
+            "expression": {
+              "type": "ArrowFunctionExpression",
+              "start": 10,
+              "end": 21,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 10
+                },
+                "end": {
+                  "line": 1,
+                  "column": 21
+                }
+              },
+              "id": null,
+              "generator": false,
+              "async": false,
+              "params": [],
+              "body": {
+                "type": "BinaryExpression",
+                "start": 16,
+                "end": 21,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 16
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 21
+                  }
+                },
+                "left": {
+                  "type": "PrimaryTopicReference",
+                  "start": 16,
+                  "end": 17,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 16
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 17
+                    }
+                  }
+                },
+                "operator": "+",
+                "right": {
+                  "type": "NumericLiteral",
+                  "start": 20,
+                  "end": 21,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 20
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 21
+                    }
+                  },
+                  "extra": {
+                    "rawValue": 1,
+                    "raw": "1"
+                  },
+                  "value": 1
+                }
+              },
+              "extra": {
+                "parenthesized": true,
+                "parenStart": 9
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow-parend-params/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow-parend-params/options.json
deleted file mode 100644
index 599d48a46961..000000000000
--- a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow-parend-params/options.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "plugins": ["pipelineOperator"]
-}
diff --git a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow/options.json b/packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow/options.json
deleted file mode 100644
index 599d48a46961..000000000000
--- a/packages/babel-parser/test/fixtures/experimental/pipeline-operator/with-arrow/options.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "plugins": ["pipelineOperator"]
-}