Add `experimental_useHermesParser` option in `preset-flow` #16284

liuxingbaoyu · 2024-02-15T10:27:53Z

Q	A
Fixed Issues?	`Fixes #1, Fixes #2`
Patch: Bug Fix?
Major: Breaking Change?
Minor: New Feature?
Tests Added + Pass?	Yes
Documentation PR Link	babel/website#2868
Any Dependency Changes?
License	MIT

To be honest, this doesn't seem to be of much use, because babel-plugin-syntax-hermes-parser is very convenient to use and will not conflict with @babel/parser.

nicolo-ribaudo · 2024-02-23T12:57:28Z

Maybe let's call this experimental_useHermesParser, since looking at npm downloads this plugin is not very battle-tested outside of Facebook yet.

To be honest, this doesn't seem to be of much use, because babel-plugin-syntax-hermes-parser is very convenient to use and will not conflict with @babel/parser.

My idea is that adding it in our preset would make it more visible and less friction to try it (you don't need to install an extra package), encouraging people to try it and then we'll can better decide if we want to switch or not.

liuxingbaoyu · 2024-02-23T15:06:55Z

Maybe let's call this experimental_useHermesParser, since looking at npm downloads this plugin is not very battle-tested outside of Facebook yet.

I like this idea.

(you don't need to install an extra package)

Currently people still need to install the plugin manually. But if we add it as a dependency, it will become a breaking change if in the future they declare the minimum nodejs version in package.json.
I'd actually favor making it a dependency and adding options or just adding documentation. :)

nicolo-ribaudo · 2024-02-26T07:53:44Z

But if we add it as a dependency, it will become a breaking change if in the future they declare the minimum nodejs version in package.json.

If that happens, we can just pin to a specific version -- we could even pin before we stop maintaining Babel 7 just in case. For Babel 8 then it won't be a problem.

liuxingbaoyu · 2024-02-26T08:01:27Z

If that happens, we can just pin to a specific version -- we could even pin before we stop maintaining Babel 7 just in case. For Babel 8 then it won't be a problem.

Great idea, I like it!

babel-bot · 2024-02-26T11:11:11Z

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/56338

Co-authored-by: Nicolò Ribaudo <hello@nicr.dev>

This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [@babel/traverse](https://babel.dev/docs/en/next/babel-traverse) ([source](https://github.com/babel/babel)) | resolutions | minor | [`7.23.9` -> `7.24.1`](https://renovatebot.com/diffs/npm/@babel%2ftraverse/7.23.9/7.24.1) | --- ### Release Notes <details> <summary>babel/babel (@babel/traverse)</summary> ### [`v7.24.1`](https://github.com/babel/babel/blob/HEAD/CHANGELOG.md#v7241-2024-03-19) [Compare Source](babel/babel@v7.24.0...v7.24.1) ##### 🐛 Bug Fix - `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-decorators` - [#16350](babel/babel#16350) Fix decorated class computed keys ordering ([@JLHwung](https://github.com/JLHwung)) - [#16344](babel/babel#16344) Fix decorated class static field private access ([@JLHwung](https://github.com/JLHwung)) - `babel-plugin-proposal-decorators`, `babel-plugin-proposal-json-modules`, `babel-plugin-transform-async-generator-functions`, `babel-plugin-transform-regenerator`, `babel-plugin-transform-runtime`, `babel-preset-env` - [#16329](babel/babel#16329) Respect `moduleName` for `@babel/runtime/regenerator` imports ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-pipeline-operator`, `babel-plugin-transform-class-properties` - [#16331](babel/babel#16331) Fix decorator memoiser binding kind ([@JLHwung](https://github.com/JLHwung)) - `babel-helper-create-class-features-plugin`, `babel-helper-replace-supers`, `babel-plugin-proposal-decorators`, `babel-plugin-transform-class-properties` - [#16325](babel/babel#16325) Fix decorator evaluation private environment ([@JLHwung](https://github.com/JLHwung)) ##### 📝 Documentation - [#16319](babel/babel#16319) Update SECURITY.md ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 🏠 Internal - `babel-code-frame`, `babel-highlight` - [#16359](babel/babel#16359) Replace `chalk` with `picocolors` ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-fixtures`, `babel-helpers`, `babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression`, `babel-plugin-proposal-pipeline-operator`, `babel-plugin-transform-unicode-sets-regex`, `babel-preset-env`, `babel-preset-flow` - [#16352](babel/babel#16352) Run Babel transform tests on old node if possible ([@JLHwung](https://github.com/JLHwung)) - `babel-helpers`, `babel-plugin-transform-async-generator-functions`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-class-static-block`, `babel-plugin-transform-modules-commonjs`, `babel-plugin-transform-modules-systemjs`, `babel-plugin-transform-regenerator`, `babel-plugin-transform-runtime`, `babel-preset-env`, `babel-runtime-corejs3`, `babel-runtime`, `babel-standalone` - [#16323](babel/babel#16323) Allow separate helpers to be excluded in Babel 8 ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-module-imports`, `babel-plugin-proposal-import-wasm-source`, `babel-plugin-proposal-json-modules`, `babel-plugin-proposal-record-and-tuple`, `babel-plugin-transform-react-jsx-development`, `babel-plugin-transform-react-jsx` - [#16349](babel/babel#16349) Support merging imports in import injector ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-create-class-features-plugin`, `babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression`, `babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining`, `babel-plugin-bugfix-v8-static-class-fields-redefine-readonly`, `babel-plugin-external-helpers`, `babel-plugin-proposal-async-do-expressions`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-destructuring-private`, `babel-plugin-proposal-do-expressions`, `babel-plugin-proposal-duplicate-named-capturing-groups-regex`, `babel-plugin-proposal-explicit-resource-management`, `babel-plugin-proposal-export-default-from`, `babel-plugin-proposal-function-bind`, `babel-plugin-proposal-function-sent`, `babel-plugin-proposal-import-attributes-to-assertions`, `babel-plugin-proposal-import-defer`, `babel-plugin-proposal-import-wasm-source`, `babel-plugin-proposal-json-modules`, `babel-plugin-proposal-optional-chaining-assign`, `babel-plugin-proposal-partial-application`, `babel-plugin-proposal-pipeline-operator`, `babel-plugin-proposal-record-and-tuple`, `babel-plugin-proposal-regexp-modifiers`, `babel-plugin-proposal-throw-expressions`, `babel-plugin-syntax-async-do-expressions`, `babel-plugin-syntax-decimal`, `babel-plugin-syntax-decorators`, `babel-plugin-syntax-destructuring-private`, `babel-plugin-syntax-do-expressions`, `babel-plugin-syntax-explicit-resource-management`, `babel-plugin-syntax-export-default-from`, `babel-plugin-syntax-flow`, `babel-plugin-syntax-function-bind`, `babel-plugin-syntax-function-sent`, `babel-plugin-syntax-import-assertions`, `babel-plugin-syntax-import-attributes`, `babel-plugin-syntax-import-defer`, `babel-plugin-syntax-import-reflection`, `babel-plugin-syntax-import-source`, `babel-plugin-syntax-jsx`, `babel-plugin-syntax-module-blocks`, `babel-plugin-syntax-optional-chaining-assign`, `babel-plugin-syntax-partial-application`, `babel-plugin-syntax-pipeline-operator`, `babel-plugin-syntax-record-and-tuple`, `babel-plugin-syntax-throw-expressions`, `babel-plugin-syntax-typescript`, `babel-plugin-transform-arrow-functions`, `babel-plugin-transform-async-generator-functions`, `babel-plugin-transform-async-to-generator`, `babel-plugin-transform-block-scoped-functions`, `babel-plugin-transform-block-scoping`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-class-static-block`, `babel-plugin-transform-classes`, `babel-plugin-transform-computed-properties`, `babel-plugin-transform-destructuring`, `babel-plugin-transform-dotall-regex`, `babel-plugin-transform-duplicate-keys`, `babel-plugin-transform-dynamic-import`, `babel-plugin-transform-exponentiation-operator`, `babel-plugin-transform-export-namespace-from`, `babel-plugin-transform-flow-comments`, `babel-plugin-transform-flow-strip-types`, `babel-plugin-transform-for-of`, `babel-plugin-transform-function-name`, `babel-plugin-transform-instanceof`, `babel-plugin-transform-jscript`, `babel-plugin-transform-json-strings`, `babel-plugin-transform-literals`, `babel-plugin-transform-logical-assignment-operators`, `babel-plugin-transform-member-expression-literals`, `babel-plugin-transform-modules-amd`, `babel-plugin-transform-modules-commonjs`, `babel-plugin-transform-modules-systemjs`, `babel-plugin-transform-modules-umd`, `babel-plugin-transform-new-target`, `babel-plugin-transform-nullish-coalescing-operator`, `babel-plugin-transform-numeric-separator`, `babel-plugin-transform-object-assign`, `babel-plugin-transform-object-rest-spread`, `babel-plugin-transform-object-set-prototype-of-to-assign`, `babel-plugin-transform-object-super`, `babel-plugin-transform-optional-catch-binding`, `babel-plugin-transform-optional-chaining`, `babel-plugin-transform-parameters`, `babel-plugin-transform-private-methods`, `babel-plugin-transform-private-property-in-object`, `babel-plugin-transform-property-literals`, `babel-plugin-transform-property-mutators`, `babel-plugin-transform-proto-to-assign`, `babel-plugin-transform-react-constant-elements`, `babel-plugin-transform-react-display-name`, `babel-plugin-transform-react-inline-elements`, `babel-plugin-transform-react-jsx-compat`, `babel-plugin-transform-react-jsx-self`, `babel-plugin-transform-react-jsx-source`, `babel-plugin-transform-react-pure-annotations`, `babel-plugin-transform-regenerator`, `babel-plugin-transform-reserved-words`, `babel-plugin-transform-runtime`, `babel-plugin-transform-shorthand-properties`, `babel-plugin-transform-spread`, `babel-plugin-transform-sticky-regex`, `babel-plugin-transform-strict-mode`, `babel-plugin-transform-template-literals`, `babel-plugin-transform-typeof-symbol`, `babel-plugin-transform-typescript`, `babel-plugin-transform-unicode-escapes`, `babel-plugin-transform-unicode-property-regex`, `babel-plugin-transform-unicode-regex`, `babel-plugin-transform-unicode-sets-regex`, `babel-preset-env`, `babel-preset-flow`, `babel-preset-react`, `babel-preset-typescript` - [#16332](babel/babel#16332) Test Babel 7 plugins compatibility with Babel 8 core ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-compat-data`, `babel-plugin-transform-object-rest-spread`, `babel-preset-env` - [#16318](babel/babel#16318) \[babel 8] Fix `@babel/compat-data` package.json ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 🔬 Output optimization - `babel-helper-replace-supers`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-classes`, `babel-plugin-transform-parameters`, `babel-plugin-transform-runtime` - [#16345](babel/babel#16345) Optimize the use of `assertThisInitialized` after `super()` ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-plugin-transform-class-properties`, `babel-plugin-transform-classes` - [#16343](babel/babel#16343) Use simpler `assertThisInitialized` more often ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-plugin-proposal-decorators`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-object-rest-spread`, `babel-traverse` - [#16342](babel/babel#16342) Consider well-known and registered symbols as literals ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-core`, `babel-plugin-external-helpers`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-function-bind`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-classes`, `babel-plugin-transform-flow-comments`, `babel-plugin-transform-flow-strip-types`, `babel-plugin-transform-function-name`, `babel-plugin-transform-modules-systemjs`, `babel-plugin-transform-parameters`, `babel-plugin-transform-private-property-in-object`, `babel-plugin-transform-react-jsx`, `babel-plugin-transform-runtime`, `babel-plugin-transform-spread`, `babel-plugin-transform-typescript`, `babel-preset-env` - [#16326](babel/babel#16326) Reduce the use of class names ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) ### [`v7.24.0`](https://github.com/babel/babel/blob/HEAD/CHANGELOG.md#v7240-2024-02-28) [Compare Source](babel/babel@v7.23.9...v7.24.0) ##### 🚀 New Feature - `babel-standalone` - [#11696](babel/babel#11696) Export babel tooling packages in `@babel/standalone` ([@ajihyf](https://github.com/ajihyf)) - `babel-core`, `babel-helper-create-class-features-plugin`, `babel-helpers`, `babel-plugin-transform-class-properties` - [#16267](babel/babel#16267) Implement `noUninitializedPrivateFieldAccess` assumption ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-create-class-features-plugin`, `babel-helpers`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-pipeline-operator`, `babel-plugin-syntax-decorators`, `babel-plugin-transform-class-properties`, `babel-runtime-corejs2`, `babel-runtime-corejs3`, `babel-runtime` - [#16242](babel/babel#16242) Support decorator 2023-11 normative updates ([@JLHwung](https://github.com/JLHwung)) - `babel-preset-flow` - [#16309](babel/babel#16309) \[babel 7] Allow setting `ignoreExtensions` in Flow preset ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - [#16284](babel/babel#16284) Add `experimental_useHermesParser` option in `preset-flow` ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-import-to-platform-api`, `babel-plugin-proposal-import-wasm-source`, `babel-plugin-proposal-json-modules`, `babel-standalone` - [#16172](babel/babel#16172) Add transform support for JSON modules imports ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-plugin-transform-runtime` - [#16241](babel/babel#16241) Add back `moduleName` option to `@babel/plugin-transform-runtime` ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-parser`, `babel-types` - [#16277](babel/babel#16277) Allow import attributes for `TSImportType` ([@sosukesuzuki](https://github.com/sosukesuzuki)) ##### 🐛 Bug Fix - `babel-plugin-proposal-do-expressions`, `babel-traverse` - [#16305](babel/babel#16305) fix: avoid `popContext` on unvisited node paths ([@JLHwung](https://github.com/JLHwung)) - `babel-helper-create-class-features-plugin`, `babel-plugin-transform-private-methods`, `babel-plugin-transform-private-property-in-object` - [#16312](babel/babel#16312) Fix class private properties when `privateFieldsAsSymbols` ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-create-class-features-plugin`, `babel-plugin-transform-private-methods` - [#16307](babel/babel#16307) Fix the support of `arguments` in private `get/set` method ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-create-class-features-plugin`, `babel-helpers`, `babel-plugin-proposal-decorators` - [#16287](babel/babel#16287) Reduce decorator static property size ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-decorators` - [#16281](babel/babel#16281) Fix evaluation order of decorators with cached receiver ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - [#16279](babel/babel#16279) Fix decorator this memoization ([@JLHwung](https://github.com/JLHwung)) - [#16266](babel/babel#16266) Preserve `static` on decorated private `accessor` ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - [#16258](babel/babel#16258) fix: handle decorated async private method and generator ([@JLHwung](https://github.com/JLHwung)) - `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-decorators`, `babel-plugin-transform-async-generator-functions`, `babel-plugin-transform-private-methods`, `babel-plugin-transform-private-property-in-object`, `babel-plugin-transform-typescript`, `babel-preset-env` - [#16275](babel/babel#16275) Fix class private properties when `privateFieldsAsProperties` ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helpers` - [#16268](babel/babel#16268) Do not consider `arguments` in a helper as a global reference ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helpers`, `babel-plugin-proposal-decorators` - [#16270](babel/babel#16270) Handle symbol key class elements decoration ([@JLHwung](https://github.com/JLHwung)) - [#16265](babel/babel#16265) Do not define `access.get` for public setter decorators ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 💅 Polish - `babel-core`, `babel-helper-create-class-features-plugin`, `babel-preset-env` - [#12428](babel/babel#12428) Suggest using `BABEL_SHOW_CONFIG_FOR` for config problems ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 🏠 Internal - `babel-helper-transform-fixture-test-runner` - [#16278](babel/babel#16278) Continue writing `output.js` when `exec.js` throws ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) ##### 🔬 Output optimization - `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-decorators` - [#16306](babel/babel#16306) Avoid intermediate functions for private accessors with decs ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-create-class-features-plugin`, `babel-helpers`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-pipeline-operator`, `babel-plugin-transform-class-properties` - [#16294](babel/babel#16294) More aggressively inline decorators in the static block ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-create-class-features-plugin`, `babel-helpers`, `babel-plugin-transform-private-methods` - [#16283](babel/babel#16283) Do not use `classPrivateMethodGet` ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-create-class-features-plugin`, `babel-helpers`, `babel-plugin-proposal-decorators` - [#16287](babel/babel#16287) Reduce decorator static property size ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-decorators`, `babel-plugin-transform-class-properties` - [#16280](babel/babel#16280) Reduce element decorator temp variables ([@JLHwung](https://github.com/JLHwung)) - `babel-helper-create-class-features-plugin`, `babel-helper-fixtures`, `babel-helpers`, `babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-destructuring-private`, `babel-plugin-proposal-optional-chaining-assign`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-class-static-block`, `babel-plugin-transform-private-methods`, `babel-plugin-transform-private-property-in-object`, `babel-preset-env`, `babel-runtime-corejs2`, `babel-runtime-corejs3`, `babel-runtime` - [#16261](babel/babel#16261) Do not use descriptors for private class elements ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - 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liuxingbaoyu changed the title ~~feat: Add useHermesParser option in flow-preset~~ feat: Add useHermesParser option in preset-flow Feb 15, 2024

liuxingbaoyu added PR: New Feature 🚀 A type of pull request used for our changelog categories area: flow PR: Needs Docs labels Feb 15, 2024

liuxingbaoyu force-pushed the add-useHermesParser branch from 8d1e507 to e33d216 Compare February 15, 2024 14:20

JLHwung approved these changes Feb 19, 2024

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nicolo-ribaudo added this to the v7.24.0 milestone Feb 23, 2024

liuxingbaoyu added 3 commits February 26, 2024 12:08

add useHermesParser

625de3f

fix standalone

61baa3b

node 12

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nicolo-ribaudo force-pushed the add-useHermesParser branch from 5590f98 to 55015cb Compare February 26, 2024 11:08

Rename to experimental_useHermesParser

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nicolo-ribaudo force-pushed the add-useHermesParser branch from 55015cb to 1e21e2a Compare February 26, 2024 11:24

nicolo-ribaudo changed the title ~~feat: Add useHermesParser option in preset-flow~~ feat: Add experimental_useHermesParser option in preset-flow Feb 26, 2024

nicolo-ribaudo approved these changes Feb 26, 2024

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nicolo-ribaudo mentioned this pull request Feb 26, 2024

Add docs for experimental_useHermesParser babel/website#2868

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nicolo-ribaudo removed the PR: Needs Docs label Feb 26, 2024

liuxingbaoyu added the PR: Ready to be Merged A pull request with already two approvals, but waiting for the next minor release label Feb 27, 2024

nicolo-ribaudo changed the title ~~feat: Add experimental_useHermesParser option in preset-flow~~ Add experimental_useHermesParser option in preset-flow Feb 27, 2024

nicolo-ribaudo merged commit 1332da5 into babel:main Feb 27, 2024
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Add experimental_useHermesParser option in preset-flow (babel#16284)

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Co-authored-by: Nicolò Ribaudo <hello@nicr.dev>

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Add `experimental_useHermesParser` option in `preset-flow` #16284

Add `experimental_useHermesParser` option in `preset-flow` #16284

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Add experimental_useHermesParser option in preset-flow #16284

Add experimental_useHermesParser option in preset-flow #16284

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Add `experimental_useHermesParser` option in `preset-flow` #16284

Add `experimental_useHermesParser` option in `preset-flow` #16284

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