Support pipeline proposal flag in @babel/parser

packages/babel-parser/src/plugin-utils.js

@@ -18,6 +18,28 @@ export function hasPlugin(plugins: PluginList, name: string): boolean {
   });
 }
 
+export function getPluginOption(
+  plugins: PluginList,
+  name: string,
+  option: string,
+) {
+  const plugin = plugins.find(plugin => {
+    if (Array.isArray(plugin)) {
+      return plugin[0] === name;
+    } else {
+      return plugin === name;
+    }
+  });
+
+  if (plugin && Array.isArray(plugin)) {
+    return plugin[1][option];
+  }
+
+  return null;
+}
+
+const PIPELINE_PROPOSALS = ["minimal"];
+
 export function validatePlugins(plugins: PluginList) {
   if (
     hasPlugin(plugins, "decorators") &&
@@ -31,6 +53,18 @@ export function validatePlugins(plugins: PluginList) {
   if (hasPlugin(plugins, "flow") && hasPlugin(plugins, "typescript")) {
     throw new Error("Cannot combine flow and typescript plugins.");
   }
+
+  if (
+    hasPlugin(plugins, "pipelineOperator") &&
+    !PIPELINE_PROPOSALS.includes(
+      getPluginOption(plugins, "pipelineOperator", "proposal"),
+    )
+  ) {
+    throw new Error(
+      "'pipelineOperator' requires 'proposal' option whose value should be one of: " +
+        PIPELINE_PROPOSALS.join(", "),
+    );
+  }
 }
 
 // These plugins are defined using a mixin which extends the parser class.

packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/with-pipeline/options.json

@@ -1,4 +1,3 @@
 {
-  "plugins": ["nullishCoalescingOperator", "pipelineOperator"]
+  "plugins": ["nullishCoalescingOperator", ["pipelineOperator", { "proposal": "minimal" }]]
 }
-

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 (1:0)"
+}

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)"
+}

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)"
+}

packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-await-requires-parens/options.json

@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}

packages/babel-parser/test/fixtures/experimental/pipeline-operator/ban-await/options.json → 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)"
 }

packages/babel-parser/test/fixtures/experimental/pipeline-operator/ban-await-f/options.json → 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)"
 }

packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-base/input.js

@@ -0,0 +1 @@
+a |> b

packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-base/options.json

@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}

packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-chain/options.json

@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}

packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-multiline/options.json

@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}

packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-precedence/options.json

@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}

packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow-parend-params/options.json

@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}

packages/babel-parser/test/fixtures/experimental/pipeline-operator/proposal-minimal-with-arrow/options.json

@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["pipelineOperator", { "proposal": "minimal" }]
+  ]
+}