Merge of 2022-01-19 babel decorators. Disabling new-version-checklist as this is intended for a private publish for testing

.circleci/config.yml

@@ -166,6 +166,14 @@ jobs:
           at: /tmp/verdaccio-workspace
       - run: BABEL_8_BREAKING=true ./scripts/integration-tests/e2e-jest.sh
 
+  e2e-breaking-prettier:
+    executor: node-executor
+    steps:
+      - checkout
+      - attach_workspace:
+          at: /tmp/verdaccio-workspace
+      - run: BABEL_8_BREAKING=true ./scripts/integration-tests/e2e-prettier.sh
+
 workflows:
   version: 2
   build-standalone:
@@ -245,3 +253,6 @@ workflows:
       - e2e-breaking-jest:
           requires:
             - publish-verdaccio-babel-8-breaking
+      - e2e-breaking-prettier:
+          requires:
+            - publish-verdaccio-babel-8-breaking

.github/workflows/ci.yml

@@ -446,6 +446,7 @@ jobs:
           - vue-cli
           - jest
           - react-native
+          - prettier
     steps:
       - name: Checkout code
         uses: actions/checkout@v2

.yarnrc.yml

@@ -35,4 +35,4 @@ releaseTool:
 unsafeHttpWhitelist:
   - localhost
 
-yarnPath: .yarn/releases/yarn-3.1.0.cjs
+yarnPath: .yarn/releases/yarn-3.1.1.cjs

CHANGELOG.md

@@ -20,6 +20,36 @@ See [`eslint-plugin-babel`'s releases](https://github.com/babel/eslint-plugin-ba
 
 <!-- DO NOT CHANGE THESE COMMENTS - See .github/actions/trigger-github-release/update-changelog.js -->
 <!-- insert-new-changelog-here -->
+## v7.16.9 (2022-01-11)
+
+#### :bug: Bug Fix
+* `babel-register`
+  * [#14136](https://github.com/babel/babel/pull/14136) Restore `@babel/register` compat with `@babel/core@7.5.x` ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+## v7.16.8 (2022-01-10)
+
+#### :bug: Bug Fix
+* `babel-generator`, `babel-plugin-syntax-typescript`, `babel-plugin-transform-parameters`
+  * [#14113](https://github.com/babel/babel/pull/14113) Print trailing comma after a single TS generic in arrow fns ([@ozanhonamlioglu](https://github.com/ozanhonamlioglu))
+* `babel-traverse`
+  * [#14105](https://github.com/babel/babel/pull/14105) fix: forward stop signal to parent path ([@JLHwung](https://github.com/JLHwung))
+* `babel-register`
+  * [#14107](https://github.com/babel/babel/pull/14107) Don't mutate `@babel/register` options ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-plugin-transform-modules-commonjs`
+  * [#14097](https://github.com/babel/babel/pull/14097) Register binding for newly created vars for commonjs transforms ([@The-x-Theorist](https://github.com/The-x-Theorist))
+* `babel-plugin-transform-typescript`
+  * [#14093](https://github.com/babel/babel/pull/14093) Fix TypeScript Enum self-references ([@magic-akari](https://github.com/magic-akari))
+
+#### :nail_care: Polish
+* `babel-generator`
+  * [#14094](https://github.com/babel/babel/pull/14094) Always print directives with double quotes when minified ([@overlookmotel](https://github.com/overlookmotel))
+
+#### :house: Internal
+* `babel-helper-fixtures`, `babel-plugin-proposal-record-and-tuple`, `babel-preset-env`
+  * [#14118](https://github.com/babel/babel/pull/14118) Always use the plugin/preset name in fixtures options ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+#### :microscope: Output optimization
+* `babel-helper-remap-async-to-generator`, `babel-helper-wrap-function`, `babel-plugin-transform-async-to-generator`
+  * [#14122](https://github.com/babel/babel/pull/14122) Optimize `transform-async-to-generator` output ([@magic-akari](https://github.com/magic-akari))
 ## v7.16.7 (2021-12-31)
 
 #### :eyeglasses: Spec Compliance

Makefile

@@ -1,6 +1,6 @@
 FLOW_COMMIT = 92bbb5e9dacb8185aa73ea343954d0434b42c40b
 TEST262_COMMIT = 46f165ae490de7f1343165ab8d228db81eaa02c5
-TYPESCRIPT_COMMIT = bbd9ff51f5fa5208b223bbb75a94e5e8184e3ffd
+TYPESCRIPT_COMMIT = b53073bf66571b4c99f0a93b8f76fb06b36d8991
 
 # Fix color output until TravisCI fixes https://github.com/travis-ci/travis-ci/issues/7967
 export FORCE_COLOR = true
@@ -187,15 +187,15 @@ prepublish:
 	IS_PUBLISH=true $(MAKE) test
 
 new-version-checklist:
-	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+# 	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
-	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+# 	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
-	@echo "!!!!!!                                                   !!!!!!"
+# 	@echo "!!!!!!                                                   !!!!!!"
-	@echo "!!!!!!      Update the version of the "identity"         !!!!!!"
+# 	@echo "!!!!!!      Update the version of the "identity"         !!!!!!"
-	@echo "!!!!!!       and "applyDecs" helpers to 7.17.0           !!!!!!"
+# 	@echo "!!!!!!       and "applyDecs" helpers to 7.17.0           !!!!!!"
-	@echo "!!!!!!                                                   !!!!!!"
+# 	@echo "!!!!!!                                                   !!!!!!"
-	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+# 	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
-	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+# 	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
-	@exit 1
+# 	@exit 1
 
 new-version:
 	$(MAKE) new-version-checklist

codemods/babel-plugin-codemod-object-assign-to-object-spread/test/fixtures/object-assign-to-object-spread/multiple-objects/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-object-assign-to-object-spread"]
 }

codemods/babel-plugin-codemod-object-assign-to-object-spread/test/fixtures/object-assign-to-object-spread/multiple/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-object-assign-to-object-spread"]
 }

codemods/babel-plugin-codemod-object-assign-to-object-spread/test/fixtures/object-assign-to-object-spread/single-non-object/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-object-assign-to-object-spread"]
 }

codemods/babel-plugin-codemod-object-assign-to-object-spread/test/fixtures/object-assign-to-object-spread/single/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-object-assign-to-object-spread"]
 }

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-block-null-binding/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-optional-catch-binding"]
 }

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-block-unused-array-pattern-binding/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-optional-catch-binding"]
 }

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-block-unused-binding/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-optional-catch-binding"]
 }

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-block-unused-object-pattern-binding/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-optional-catch-binding"]
 }

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-block-used-array-pattern-binding/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-optional-catch-binding"]
 }

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-block-used-binding-variable/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-optional-catch-binding"]
 }

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-block-used-binding/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-optional-catch-binding"]
 }

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-block-used-object-pattern-binding/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-optional-catch-binding"]
 }

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-finally-unused-binding/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-optional-catch-binding"]
 }

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-finally-used-binding/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["../../../../lib"]
+  "plugins": ["codemod-optional-catch-binding"]
 }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "babel",
-  "version": "7.16.7",
+  "version": "7.16.9",
   "private": true,
   "type": "commonjs",
   "scripts": {
@@ -17,7 +17,7 @@
     "test:runtime:bundlers": "node test/runtime-integration/bundlers.cjs",
     "test:runtime:node": "node test/runtime-integration/node.cjs"
   },
-  "packageManager": "yarn@3.1.0",
+  "packageManager": "yarn@3.1.1",
   "devDependencies": {
     "@babel/cli": "^7.16.0",
     "@babel/core": "^7.16.0",
@@ -88,7 +88,7 @@
   "resolutions": {
     "browserslist": "npm:4.17.5",
     "caniuse-lite": "npm:1.0.30001274",
-    "core-js-compat": "npm:3.19.0",
+    "core-js-compat": "npm:3.20.2",
     "electron-to-chromium": "npm:1.3.749",
     "glob-watcher/chokidar": "npm:^3.4.0",
     "@types/babel__core": "link:./nope",

packages/babel-cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/cli",
-  "version": "7.16.7",
+  "version": "7.16.8",
   "description": "Babel command line.",
   "author": "The Babel Team (https://babel.dev/team)",
   "homepage": "https://babel.dev/docs/en/next/babel-cli",

packages/babel-cli/src/babel/util.ts

@@ -115,12 +115,12 @@ process.on("uncaughtException", function (err) {
 });
 
 export function requireChokidar(): any {
-  // $FlowIgnore - https://github.com/facebook/flow/issues/6913#issuecomment-662787504
+  const require = createRequire(import.meta.url);
-  const require = createRequire(import /*::("")*/.meta.url);
 
   try {
-    // todo(babel 8): revert `@nicolo-ribaudo/chokidar-2` hack
+    return process.env.BABEL_8_BREAKING
-    return parseInt(process.versions.node) >= 8
+      ? require("chokidar")
+      : parseInt(process.versions.node) >= 8
       ? require("chokidar")
       : require("@nicolo-ribaudo/chokidar-2");
   } catch (err) {

packages/babel-compat-data/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/compat-data",
-  "version": "7.16.4",
+  "version": "7.16.8",
   "author": "The Babel Team (https://babel.dev/team)",
   "license": "MIT",
   "description": "",
@@ -30,7 +30,7 @@
   ],
   "devDependencies": {
     "@mdn/browser-compat-data": "^4.0.10",
-    "core-js-compat": "^3.19.1",
+    "core-js-compat": "^3.20.2",
     "electron-to-chromium": "^1.3.893"
   },
   "engines": {

packages/babel-core/src/config/files/plugins.ts

@@ -6,6 +6,7 @@ import buildDebug from "debug";
 import path from "path";
 import type { Handler } from "gensync";
 import loadCjsOrMjsDefault from "./module-types";
+import { isAsync } from "../../gensync-utils/async";
 
 import { createRequire } from "module";
 const require = createRequire(import.meta.url);
@@ -149,18 +150,25 @@ function resolveStandardizedName(
   }
 }
 
-const LOADING_MODULES = new Set();
+if (!process.env.BABEL_8_BREAKING) {
+  // eslint-disable-next-line no-var
+  var LOADING_MODULES = new Set();
+}
 function* requireModule(type: string, name: string): Handler<unknown> {
-  if (LOADING_MODULES.has(name)) {
+  if (!process.env.BABEL_8_BREAKING) {
+    if (!(yield* isAsync()) && LOADING_MODULES.has(name)) {
       throw new Error(
         `Reentrant ${type} detected trying to load "${name}". This module is not ignored ` +
           "and is trying to load itself while compiling itself, leading to a dependency cycle. " +
           'We recommend adding it to your "ignore" list in your babelrc, or to a .babelignore.',
       );
     }
+  }
 
   try {
+    if (!process.env.BABEL_8_BREAKING) {
       LOADING_MODULES.add(name);
+    }
     return yield* loadCjsOrMjsDefault(
       name,
       `You appear to be using a native ECMAScript module ${type}, ` +
@@ -175,6 +183,8 @@ function* requireModule(type: string, name: string): Handler<unknown> {
     err.message = `[BABEL]: ${err.message} (While processing: ${name})`;
     throw err;
   } finally {
+    if (!process.env.BABEL_8_BREAKING) {
       LOADING_MODULES.delete(name);
     }
   }
+}

packages/babel-generator/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/generator",
-  "version": "7.16.7",
+  "version": "7.16.8",
   "description": "Turns an AST into code.",
   "author": "The Babel Team (https://babel.dev/team)",
   "license": "MIT",

packages/babel-generator/src/generators/typescript.ts

@@ -12,9 +12,13 @@ export function TSTypeAnnotation(this: Printer, node: t.TSTypeAnnotation) {
 export function TSTypeParameterInstantiation(
   this: Printer,
   node: t.TSTypeParameterInstantiation,
+  parent: t.Node,
 ): void {
   this.token("<");
   this.printList(node.params, node, {});
+  if (parent.type === "ArrowFunctionExpression" && node.params.length === 1) {
+    this.token(",");
+  }
   this.token(">");
 }
 
@@ -221,7 +225,10 @@ export function tsPrintFunctionOrConstructorType(
   // todo: missing type FunctionOrConstructorType
   node: any,
 ) {
-  const { typeParameters, parameters } = node;
+  const { typeParameters } = node;
+  const parameters = process.env.BABEL_8_BREAKING
+    ? node.params
+    : node.parameters;
   this.print(typeParameters, node);
   this.token("(");
   this._parameters(parameters, node);
@@ -229,7 +236,10 @@ export function tsPrintFunctionOrConstructorType(
   this.space();
   this.token("=>");
   this.space();
-  this.print(node.typeAnnotation.typeAnnotation, node);
+  const returnType = process.env.BABEL_8_BREAKING
+    ? node.returnType
+    : node.typeAnnotation;
+  this.print(returnType.typeAnnotation, node);
 }
 
 export function TSTypeReference(this: Printer, node: t.TSTypeReference) {
@@ -644,12 +654,18 @@ export function TSNamespaceExportDeclaration(
 }
 
 export function tsPrintSignatureDeclarationBase(this: Printer, node: any) {
-  const { typeParameters, parameters } = node;
+  const { typeParameters } = node;
+  const parameters = process.env.BABEL_8_BREAKING
+    ? node.params
+    : node.parameters;
   this.print(typeParameters, node);
   this.token("(");
   this._parameters(parameters, node);
   this.token(")");
-  this.print(node.typeAnnotation, node);
+  const returnType = process.env.BABEL_8_BREAKING
+    ? node.returnType
+    : node.typeAnnotation;
+  this.print(returnType, node);
 }
 
 export function tsPrintClassMemberModifiers(this: Printer, node: any, isField) {

packages/babel-generator/test/fixtures/typescript/arrow-function-async-generic/output.js

@@ -1 +1 @@
-async <T>(a: T): T => a;
+async <T,>(a: T): T => a;

packages/babel-generator/test/fixtures/typescript/arrow-function-generic-tsx-trailing-comma/input.js

@@ -0,0 +1,2 @@
+// Verify typescript doesn't change anything inside type parameter declaration
+const foo = <T,>(a: T): T => a;

packages/babel-generator/test/fixtures/typescript/arrow-function-generic-tsx-trailing-comma/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["jsx", "typescript"]
+}

packages/babel-generator/test/fixtures/typescript/arrow-function-generic-tsx-trailing-comma/output.js

@@ -0,0 +1,2 @@
+// Verify typescript doesn't change anything inside type parameter declaration
+const foo = <T,>(a: T): T => a;

packages/babel-generator/test/fixtures/typescript/arrow-function-generic-tsx/output.js

@@ -1,2 +1,2 @@
 // Same as `generic`. Verify that JSX doesn't change things.
-<T>(a: T): T => a;
+<T,>(a: T): T => a;

packages/babel-generator/test/fixtures/typescript/arrow-function-generic/output.js

@@ -1 +1 @@
-<T>(a: T): T => a;
+<T,>(a: T): T => a;

packages/babel-helper-create-class-features-plugin/src/index.ts

@@ -38,6 +38,7 @@ interface Options {
   name: string;
   feature: number;
   loose?: boolean;
+  inherits?: (api: any, options: any) => any;
   // same as PluginObject.manipulateOptions
   manipulateOptions: (options: unknown, parserOpts: ParserOptions) => void;
   // TODO(flow->ts): change to babel api
@@ -51,6 +52,7 @@ export function createClassFeaturePlugin({
   manipulateOptions,
   // TODO(Babel 8): Remove the default value
   api = { assumption: () => void 0 },
+  inherits,
 }: Options) {
   const setPublicClassFields = api.assumption("setPublicClassFields");
   const privateFieldsAsProperties = api.assumption("privateFieldsAsProperties");
@@ -85,6 +87,7 @@ export function createClassFeaturePlugin({
   return {
     name,
     manipulateOptions,
+    inherits,
 
     pre() {
       enableFeature(this.file, feature, loose);

packages/babel-helper-fixtures/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/helper-fixtures",
-  "version": "7.16.7",
+  "version": "7.16.8",
   "description": "Helper function to support fixtures",
   "author": "The Babel Team (https://babel.dev/team)",
   "license": "MIT",

packages/babel-helper-fixtures/src/index.ts

@@ -298,7 +298,8 @@ function wrapPackagesArray(type, names, optionsDir) {
 
       const monorepoPath = path.join(
         path.dirname(fileURLToPath(import.meta.url)),
-        "../..",
+        "../../..",
+        name.startsWith("codemod") ? "codemods" : "packages",
         `babel-${type}-${name}`,
       );
 

packages/babel-helper-remap-async-to-generator/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/helper-remap-async-to-generator",
-  "version": "7.16.7",
+  "version": "7.16.8",
   "description": "Helper function to remap async functions to generators",
   "repository": {
     "type": "git",

packages/babel-helper-remap-async-to-generator/src/index.ts

@@ -36,6 +36,7 @@ export default function (
     wrapAwait?: any;
   },
   noNewArrows?: boolean,
+  ignoreFunctionLength?: boolean,
 ) {
   path.traverse(awaitVisitor, {
     wrapAwait: helpers.wrapAwait,
@@ -46,7 +47,12 @@ export default function (
   path.node.async = false;
   path.node.generator = true;
 
-  wrapFunction(path, cloneNode(helpers.wrapAsync), noNewArrows);
+  wrapFunction(
+    path,
+    cloneNode(helpers.wrapAsync),
+    noNewArrows,
+    ignoreFunctionLength,
+  );
 
   const isProperty =
     path.isObjectMethod() ||

packages/babel-helper-wrap-function/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/helper-wrap-function",
-  "version": "7.16.7",
+  "version": "7.16.8",
   "description": "Helper to wrap functions inside a function call.",
   "repository": {
     "type": "git",

packages/babel-helper-wrap-function/src/index.ts

@@ -66,7 +66,12 @@ function classOrObjectMethod(
   ).unwrapFunctionEnvironment();
 }
 
-function plainFunction(path: NodePath<any>, callId: any, noNewArrows: boolean) {
+function plainFunction(
+  path: NodePath<any>,
+  callId: any,
+  noNewArrows: boolean,
+  ignoreFunctionLength: boolean,
+) {
   const node = path.node;
   const isDeclaration = path.isFunctionDeclaration();
   const functionId = node.id;
@@ -87,26 +92,20 @@ function plainFunction(path: NodePath<any>, callId: any, noNewArrows: boolean) {
   }
 
   const built = callExpression(callId, [node]);
+
+  const params: t.Identifier[] = [];
+  for (const param of node.params) {
+    if (isAssignmentPattern(param) || isRestElement(param)) {
+      break;
+    }
+    params.push(path.scope.generateUidIdentifier("x"));
+  }
+
   const container = wrapper({
     NAME: functionId || null,
     REF: path.scope.generateUidIdentifier(functionId ? functionId.name : "ref"),
     FUNCTION: built,
-    PARAMS: node.params.reduce(
+    PARAMS: params,
-      (acc, param) => {
-        acc.done =
-          acc.done || isAssignmentPattern(param) || isRestElement(param);
-
-        if (!acc.done) {
-          acc.params.push(path.scope.generateUidIdentifier("x"));
-        }
-
-        return acc;
-      },
-      {
-        params: [],
-        done: false,
-      },
-    ).params,
   });
 
   if (isDeclaration) {
@@ -123,7 +122,11 @@ function plainFunction(path: NodePath<any>, callId: any, noNewArrows: boolean) {
       });
     }
 
-    if (!retFunction || retFunction.id || node.params.length) {
+    if (
+      !retFunction ||
+      retFunction.id ||
+      (!ignoreFunctionLength && params.length)
+    ) {
       // we have an inferred function id or params so we need this wrapper
       // @ts-expect-error todo(flow->ts) separate `wrapper` for `isDeclaration` and `else` branches
       path.replaceWith(container);
@@ -139,10 +142,11 @@ export default function wrapFunction(
   callId: any,
   // TODO(Babel 8): Consider defaulting to false for spec compliancy
   noNewArrows: boolean = true,
+  ignoreFunctionLength: boolean = false,
 ) {
   if (path.isMethod()) {
     classOrObjectMethod(path, callId);
   } else {
-    plainFunction(path, callId, noNewArrows);
+    plainFunction(path, callId, noNewArrows, ignoreFunctionLength);
   }
 }

packages/babel-helpers/src/helpers/applyDecs.js

@@ -56,7 +56,7 @@ function createMetadataMethodsForProperty(metadataMap, kind, property) {
         var pub = metadataForKey.public;
 
         if (pub === void 0) {
-          pub = metadataForKey.public = Object.create(null);
+          pub = metadataForKey.public = {};
         }
 
         pub[property] = value;
@@ -76,7 +76,7 @@ function createMetadataMethodsForProperty(metadataMap, kind, property) {
 }
 
 function convertMetadataMapToFinal(obj, metadataMap) {
-  var parentMetadataMap = obj[Symbol.metadata];
+  var parentMetadataMap = obj[Symbol.metadata || Symbol.for("Symbol.metadata")];
   var metadataKeys = Object.getOwnPropertySymbols(metadataMap);
 
   if (metadataKeys.length === 0) return;
@@ -115,7 +115,7 @@ function convertMetadataMapToFinal(obj, metadataMap) {
     Object.setPrototypeOf(metadataMap, parentMetadataMap);
   }
 
-  obj[Symbol.metadata] = metadataMap;
+  obj[Symbol.metadata || Symbol.for("Symbol.metadata")] = metadataMap;
 }
 
 function createAddInitializerMethod(initializers) {

packages/babel-node/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/node",
-  "version": "7.16.7",
+  "version": "7.16.8",
   "description": "Babel command line",
   "author": "The Babel Team (https://babel.dev/team)",
   "homepage": "https://babel.dev/docs/en/next/babel-node",
@@ -25,7 +25,7 @@
   "dependencies": {
     "@babel/register": "workspace:^",
     "commander": "^4.0.1",
-    "core-js": "^3.19.0",
+    "core-js": "^3.20.2",
     "node-environment-flags": "^1.0.5",
     "regenerator-runtime": "^0.13.4",
     "v8flags": "^3.1.1"

packages/babel-parser/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/parser",
-  "version": "7.16.7",
+  "version": "7.16.8",
   "description": "A JavaScript parser",
   "author": "The Babel Team (https://babel.dev/team)",
   "homepage": "https://babel.dev/docs/en/next/babel-parser",

packages/babel-parser/src/plugins/typescript/index.js

@@ -584,14 +584,21 @@ export default (superClass: Class<Parser>): Class<Parser> =>
     ): void {
       // Arrow fns *must* have return token (`=>`). Normal functions can omit it.
       const returnTokenRequired = returnToken === tt.arrow;
+
+      // https://github.com/babel/babel/issues/9231
+      const paramsKey = process.env.BABEL_8_BREAKING ? "params" : "parameters";
+      const returnTypeKey = process.env.BABEL_8_BREAKING
+        ? "returnType"
+        : "typeAnnotation";
+
       signature.typeParameters = this.tsTryParseTypeParameters();
       this.expect(tt.parenL);
-      signature.parameters = this.tsParseBindingListForSignature();
+      signature[paramsKey] = this.tsParseBindingListForSignature();
       if (returnTokenRequired) {
-        signature.typeAnnotation =
+        signature[returnTypeKey] =
           this.tsParseTypeOrTypePredicateAnnotation(returnToken);
       } else if (this.match(returnToken)) {
-        signature.typeAnnotation =
+        signature[returnTypeKey] =
           this.tsParseTypeOrTypePredicateAnnotation(returnToken);
       }
     }
@@ -683,10 +690,16 @@ export default (superClass: Class<Parser>): Class<Parser> =>
         }
         this.tsFillSignature(tt.colon, method);
         this.tsParseTypeMemberSemicolon();
+        const paramsKey = process.env.BABEL_8_BREAKING
+          ? "params"
+          : "parameters";
+        const returnTypeKey = process.env.BABEL_8_BREAKING
+          ? "returnType"
+          : "typeAnnotation";
         if (method.kind === "get") {
-          if (method.parameters.length > 0) {
+          if (method[paramsKey].length > 0) {
             this.raise(this.state.pos, Errors.BadGetterArity);
-            if (this.isThisParam(method.parameters[0])) {
+            if (this.isThisParam(method[paramsKey][0])) {
               this.raise(
                 this.state.pos,
                 TSErrors.AccesorCannotDeclareThisParameter,
@@ -694,10 +707,10 @@ export default (superClass: Class<Parser>): Class<Parser> =>
             }
           }
         } else if (method.kind === "set") {
-          if (method.parameters.length !== 1) {
+          if (method[paramsKey].length !== 1) {
             this.raise(this.state.pos, Errors.BadSetterArity);
           } else {
-            const firstParameter = method.parameters[0];
+            const firstParameter = method[paramsKey][0];
             if (this.isThisParam(firstParameter)) {
               this.raise(
                 this.state.pos,
@@ -720,9 +733,9 @@ export default (superClass: Class<Parser>): Class<Parser> =>
               );
             }
           }
-          if (method.typeAnnotation) {
+          if (method[returnTypeKey]) {
             this.raise(
-              method.typeAnnotation.start,
+              method[returnTypeKey].start,
               TSErrors.SetAccesorCannotHaveReturnType,
             );
           }

packages/babel-parser/src/types.js

@@ -1270,6 +1270,11 @@ export type TsSignatureDeclaration =
 
 export type TsSignatureDeclarationOrIndexSignatureBase = NodeBase & {
   // Not using TypeScript's "ParameterDeclaration" here, since it's inconsistent with regular functions.
+  params: $ReadOnlyArray<
+    Identifier | RestElement | ObjectPattern | ArrayPattern,
+  >,
+  returnType: ?TsTypeAnnotation,
+  // TODO(Babel-8): Remove
   parameters: $ReadOnlyArray<
     Identifier | RestElement | ObjectPattern | ArrayPattern,
   >,

packages/babel-parser/test/fixtures/typescript/declare/pattern-parameters-babel-7/input.ts

@@ -0,0 +1,5 @@
+declare interface B {
+  foo([]?): void;
+  bar({}, []?): any;
+  baz(a: string, b: number, []?): void;
+}

packages/babel-parser/test/fixtures/typescript/declare/pattern-parameters-babel-7/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": false
+}

packages/babel-parser/test/fixtures/typescript/declare/pattern-parameters-babel-7/output.json

@@ -0,0 +1,141 @@
+{
+  "type": "File",
+  "start":0,"end":102,"loc":{"start":{"line":1,"column":0},"end":{"line":5,"column":1}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":102,"loc":{"start":{"line":1,"column":0},"end":{"line":5,"column":1}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSInterfaceDeclaration",
+        "start":0,"end":102,"loc":{"start":{"line":1,"column":0},"end":{"line":5,"column":1}},
+        "id": {
+          "type": "Identifier",
+          "start":18,"end":19,"loc":{"start":{"line":1,"column":18},"end":{"line":1,"column":19},"identifierName":"B"},
+          "name": "B"
+        },
+        "body": {
+          "type": "TSInterfaceBody",
+          "start":20,"end":102,"loc":{"start":{"line":1,"column":20},"end":{"line":5,"column":1}},
+          "body": [
+            {
+              "type": "TSMethodSignature",
+              "start":24,"end":39,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":17}},
+              "key": {
+                "type": "Identifier",
+                "start":24,"end":27,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":5},"identifierName":"foo"},
+                "name": "foo"
+              },
+              "computed": false,
+              "parameters": [
+                {
+                  "type": "ArrayPattern",
+                  "start":28,"end":31,"loc":{"start":{"line":2,"column":6},"end":{"line":2,"column":9}},
+                  "elements": [],
+                  "optional": true
+                }
+              ],
+              "typeAnnotation": {
+                "type": "TSTypeAnnotation",
+                "start":32,"end":38,"loc":{"start":{"line":2,"column":10},"end":{"line":2,"column":16}},
+                "typeAnnotation": {
+                  "type": "TSVoidKeyword",
+                  "start":34,"end":38,"loc":{"start":{"line":2,"column":12},"end":{"line":2,"column":16}}
+                }
+              },
+              "kind": "method"
+            },
+            {
+              "type": "TSMethodSignature",
+              "start":42,"end":60,"loc":{"start":{"line":3,"column":2},"end":{"line":3,"column":20}},
+              "key": {
+                "type": "Identifier",
+                "start":42,"end":45,"loc":{"start":{"line":3,"column":2},"end":{"line":3,"column":5},"identifierName":"bar"},
+                "name": "bar"
+              },
+              "computed": false,
+              "parameters": [
+                {
+                  "type": "ObjectPattern",
+                  "start":46,"end":48,"loc":{"start":{"line":3,"column":6},"end":{"line":3,"column":8}},
+                  "properties": []
+                },
+                {
+                  "type": "ArrayPattern",
+                  "start":50,"end":53,"loc":{"start":{"line":3,"column":10},"end":{"line":3,"column":13}},
+                  "elements": [],
+                  "optional": true
+                }
+              ],
+              "typeAnnotation": {
+                "type": "TSTypeAnnotation",
+                "start":54,"end":59,"loc":{"start":{"line":3,"column":14},"end":{"line":3,"column":19}},
+                "typeAnnotation": {
+                  "type": "TSAnyKeyword",
+                  "start":56,"end":59,"loc":{"start":{"line":3,"column":16},"end":{"line":3,"column":19}}
+                }
+              },
+              "kind": "method"
+            },
+            {
+              "type": "TSMethodSignature",
+              "start":63,"end":100,"loc":{"start":{"line":4,"column":2},"end":{"line":4,"column":39}},
+              "key": {
+                "type": "Identifier",
+                "start":63,"end":66,"loc":{"start":{"line":4,"column":2},"end":{"line":4,"column":5},"identifierName":"baz"},
+                "name": "baz"
+              },
+              "computed": false,
+              "parameters": [
+                {
+                  "type": "Identifier",
+                  "start":67,"end":76,"loc":{"start":{"line":4,"column":6},"end":{"line":4,"column":15},"identifierName":"a"},
+                  "name": "a",
+                  "typeAnnotation": {
+                    "type": "TSTypeAnnotation",
+                    "start":68,"end":76,"loc":{"start":{"line":4,"column":7},"end":{"line":4,"column":15}},
+                    "typeAnnotation": {
+                      "type": "TSStringKeyword",
+                      "start":70,"end":76,"loc":{"start":{"line":4,"column":9},"end":{"line":4,"column":15}}
+                    }
+                  }
+                },
+                {
+                  "type": "Identifier",
+                  "start":78,"end":87,"loc":{"start":{"line":4,"column":17},"end":{"line":4,"column":26},"identifierName":"b"},
+                  "name": "b",
+                  "typeAnnotation": {
+                    "type": "TSTypeAnnotation",
+                    "start":79,"end":87,"loc":{"start":{"line":4,"column":18},"end":{"line":4,"column":26}},
+                    "typeAnnotation": {
+                      "type": "TSNumberKeyword",
+                      "start":81,"end":87,"loc":{"start":{"line":4,"column":20},"end":{"line":4,"column":26}}
+                    }
+                  }
+                },
+                {
+                  "type": "ArrayPattern",
+                  "start":89,"end":92,"loc":{"start":{"line":4,"column":28},"end":{"line":4,"column":31}},
+                  "elements": [],
+                  "optional": true
+                }
+              ],
+              "typeAnnotation": {
+                "type": "TSTypeAnnotation",
+                "start":93,"end":99,"loc":{"start":{"line":4,"column":32},"end":{"line":4,"column":38}},
+                "typeAnnotation": {
+                  "type": "TSVoidKeyword",
+                  "start":95,"end":99,"loc":{"start":{"line":4,"column":34},"end":{"line":4,"column":38}}
+                }
+              },
+              "kind": "method"
+            }
+          ]
+        },
+        "declare": true
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/typescript/declare/pattern-parameters/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-parser/test/fixtures/typescript/declare/pattern-parameters/output.json

@@ -28,7 +28,7 @@
                 "name": "foo"
               },
               "computed": false,
-              "parameters": [
+              "params": [
                 {
                   "type": "ArrayPattern",
                   "start":28,"end":31,"loc":{"start":{"line":2,"column":6},"end":{"line":2,"column":9}},
@@ -36,7 +36,7 @@
                   "optional": true
                 }
               ],
-              "typeAnnotation": {
+              "returnType": {
                 "type": "TSTypeAnnotation",
                 "start":32,"end":38,"loc":{"start":{"line":2,"column":10},"end":{"line":2,"column":16}},
                 "typeAnnotation": {
@@ -55,7 +55,7 @@
                 "name": "bar"
               },
               "computed": false,
-              "parameters": [
+              "params": [
                 {
                   "type": "ObjectPattern",
                   "start":46,"end":48,"loc":{"start":{"line":3,"column":6},"end":{"line":3,"column":8}},
@@ -68,7 +68,7 @@
                   "optional": true
                 }
               ],
-              "typeAnnotation": {
+              "returnType": {
                 "type": "TSTypeAnnotation",
                 "start":54,"end":59,"loc":{"start":{"line":3,"column":14},"end":{"line":3,"column":19}},
                 "typeAnnotation": {
@@ -87,7 +87,7 @@
                 "name": "baz"
               },
               "computed": false,
-              "parameters": [
+              "params": [
                 {
                   "type": "Identifier",
                   "start":67,"end":76,"loc":{"start":{"line":4,"column":6},"end":{"line":4,"column":15},"identifierName":"a"},
@@ -121,7 +121,7 @@
                   "optional": true
                 }
               ],
-              "typeAnnotation": {
+              "returnType": {
                 "type": "TSTypeAnnotation",
                 "start":93,"end":99,"loc":{"start":{"line":4,"column":32},"end":{"line":4,"column":38}},
                 "typeAnnotation": {

packages/babel-parser/test/fixtures/typescript/interface/call-signature-babel-7/input.ts

@@ -0,0 +1,3 @@
+interface I {
+    (x: number): void;
+}

packages/babel-parser/test/fixtures/typescript/interface/call-signature-babel-7/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": false
+}

packages/babel-parser/test/fixtures/typescript/interface/call-signature-babel-7/output.json

@@ -0,0 +1,55 @@
+{
+  "type": "File",
+  "start":0,"end":38,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":38,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSInterfaceDeclaration",
+        "start":0,"end":38,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+        "id": {
+          "type": "Identifier",
+          "start":10,"end":11,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":11},"identifierName":"I"},
+          "name": "I"
+        },
+        "body": {
+          "type": "TSInterfaceBody",
+          "start":12,"end":38,"loc":{"start":{"line":1,"column":12},"end":{"line":3,"column":1}},
+          "body": [
+            {
+              "type": "TSCallSignatureDeclaration",
+              "start":18,"end":36,"loc":{"start":{"line":2,"column":4},"end":{"line":2,"column":22}},
+              "parameters": [
+                {
+                  "type": "Identifier",
+                  "start":19,"end":28,"loc":{"start":{"line":2,"column":5},"end":{"line":2,"column":14},"identifierName":"x"},
+                  "name": "x",
+                  "typeAnnotation": {
+                    "type": "TSTypeAnnotation",
+                    "start":20,"end":28,"loc":{"start":{"line":2,"column":6},"end":{"line":2,"column":14}},
+                    "typeAnnotation": {
+                      "type": "TSNumberKeyword",
+                      "start":22,"end":28,"loc":{"start":{"line":2,"column":8},"end":{"line":2,"column":14}}
+                    }
+                  }
+                }
+              ],
+              "typeAnnotation": {
+                "type": "TSTypeAnnotation",
+                "start":29,"end":35,"loc":{"start":{"line":2,"column":15},"end":{"line":2,"column":21}},
+                "typeAnnotation": {
+                  "type": "TSVoidKeyword",
+                  "start":31,"end":35,"loc":{"start":{"line":2,"column":17},"end":{"line":2,"column":21}}
+                }
+              }
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/typescript/interface/call-signature/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-parser/test/fixtures/typescript/interface/call-signature/output.json

@@ -22,7 +22,7 @@
             {
               "type": "TSCallSignatureDeclaration",
               "start":18,"end":36,"loc":{"start":{"line":2,"column":4},"end":{"line":2,"column":22}},
-              "parameters": [
+              "params": [
                 {
                   "type": "Identifier",
                   "start":19,"end":28,"loc":{"start":{"line":2,"column":5},"end":{"line":2,"column":14},"identifierName":"x"},
@@ -37,7 +37,7 @@
                   }
                 }
               ],
-              "typeAnnotation": {
+              "returnType": {
                 "type": "TSTypeAnnotation",
                 "start":29,"end":35,"loc":{"start":{"line":2,"column":15},"end":{"line":2,"column":21}},
                 "typeAnnotation": {

packages/babel-parser/test/fixtures/typescript/interface/construct-signature-babel-7/input.ts

@@ -0,0 +1,3 @@
+interface I {
+    new (x: number): void;
+}

packages/babel-parser/test/fixtures/typescript/interface/construct-signature-babel-7/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": false
+}

packages/babel-parser/test/fixtures/typescript/interface/construct-signature-babel-7/output.json

@@ -0,0 +1,55 @@
+{
+  "type": "File",
+  "start":0,"end":42,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":42,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSInterfaceDeclaration",
+        "start":0,"end":42,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+        "id": {
+          "type": "Identifier",
+          "start":10,"end":11,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":11},"identifierName":"I"},
+          "name": "I"
+        },
+        "body": {
+          "type": "TSInterfaceBody",
+          "start":12,"end":42,"loc":{"start":{"line":1,"column":12},"end":{"line":3,"column":1}},
+          "body": [
+            {
+              "type": "TSConstructSignatureDeclaration",
+              "start":18,"end":40,"loc":{"start":{"line":2,"column":4},"end":{"line":2,"column":26}},
+              "parameters": [
+                {
+                  "type": "Identifier",
+                  "start":23,"end":32,"loc":{"start":{"line":2,"column":9},"end":{"line":2,"column":18},"identifierName":"x"},
+                  "name": "x",
+                  "typeAnnotation": {
+                    "type": "TSTypeAnnotation",
+                    "start":24,"end":32,"loc":{"start":{"line":2,"column":10},"end":{"line":2,"column":18}},
+                    "typeAnnotation": {
+                      "type": "TSNumberKeyword",
+                      "start":26,"end":32,"loc":{"start":{"line":2,"column":12},"end":{"line":2,"column":18}}
+                    }
+                  }
+                }
+              ],
+              "typeAnnotation": {
+                "type": "TSTypeAnnotation",
+                "start":33,"end":39,"loc":{"start":{"line":2,"column":19},"end":{"line":2,"column":25}},
+                "typeAnnotation": {
+                  "type": "TSVoidKeyword",
+                  "start":35,"end":39,"loc":{"start":{"line":2,"column":21},"end":{"line":2,"column":25}}
+                }
+              }
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/typescript/interface/construct-signature/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-parser/test/fixtures/typescript/interface/construct-signature/output.json

@@ -22,7 +22,7 @@
             {
               "type": "TSConstructSignatureDeclaration",
               "start":18,"end":40,"loc":{"start":{"line":2,"column":4},"end":{"line":2,"column":26}},
-              "parameters": [
+              "params": [
                 {
                   "type": "Identifier",
                   "start":23,"end":32,"loc":{"start":{"line":2,"column":9},"end":{"line":2,"column":18},"identifierName":"x"},
@@ -37,7 +37,7 @@
                   }
                 }
               ],
-              "typeAnnotation": {
+              "returnType": {
                 "type": "TSTypeAnnotation",
                 "start":33,"end":39,"loc":{"start":{"line":2,"column":19},"end":{"line":2,"column":25}},
                 "typeAnnotation": {

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-1/input.ts

@@ -0,0 +1,3 @@
+interface Foo {
+  <T>(a: string): string;
+}

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-1/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-1/output.json

@@ -0,0 +1,70 @@
+{
+  "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": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSInterfaceDeclaration",
+        "start":0,"end":43,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+        "id": {
+          "type": "Identifier",
+          "start":10,"end":13,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":13},"identifierName":"Foo"},
+          "name": "Foo"
+        },
+        "body": {
+          "type": "TSInterfaceBody",
+          "start":14,"end":43,"loc":{"start":{"line":1,"column":14},"end":{"line":3,"column":1}},
+          "body": [
+            {
+              "type": "TSCallSignatureDeclaration",
+              "start":18,"end":41,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":25}},
+              "typeParameters": {
+                "type": "TSTypeParameterDeclaration",
+                "start":18,"end":21,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":5}},
+                "params": [
+                  {
+                    "type": "TSTypeParameter",
+                    "start":19,"end":20,"loc":{"start":{"line":2,"column":3},"end":{"line":2,"column":4}},
+                    "name": {
+                      "type": "Identifier",
+                      "start":19,"end":20,"loc":{"start":{"line":2,"column":3},"end":{"line":2,"column":4},"identifierName":"T"},
+                      "name": "T"
+                    }
+                  }
+                ]
+              },
+              "params": [
+                {
+                  "type": "Identifier",
+                  "start":22,"end":31,"loc":{"start":{"line":2,"column":6},"end":{"line":2,"column":15},"identifierName":"a"},
+                  "name": "a",
+                  "typeAnnotation": {
+                    "type": "TSTypeAnnotation",
+                    "start":23,"end":31,"loc":{"start":{"line":2,"column":7},"end":{"line":2,"column":15}},
+                    "typeAnnotation": {
+                      "type": "TSStringKeyword",
+                      "start":25,"end":31,"loc":{"start":{"line":2,"column":9},"end":{"line":2,"column":15}}
+                    }
+                  }
+                }
+              ],
+              "returnType": {
+                "type": "TSTypeAnnotation",
+                "start":32,"end":40,"loc":{"start":{"line":2,"column":16},"end":{"line":2,"column":24}},
+                "typeAnnotation": {
+                  "type": "TSStringKeyword",
+                  "start":34,"end":40,"loc":{"start":{"line":2,"column":18},"end":{"line":2,"column":24}}
+                }
+              }
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-2/input.ts

@@ -0,0 +1 @@
+type Foo = <T>() => number;

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-2/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-2/output.json

@@ -0,0 +1,50 @@
+{
+  "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": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSTypeAliasDeclaration",
+        "start":0,"end":27,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":27}},
+        "id": {
+          "type": "Identifier",
+          "start":5,"end":8,"loc":{"start":{"line":1,"column":5},"end":{"line":1,"column":8},"identifierName":"Foo"},
+          "name": "Foo"
+        },
+        "typeAnnotation": {
+          "type": "TSFunctionType",
+          "start":11,"end":26,"loc":{"start":{"line":1,"column":11},"end":{"line":1,"column":26}},
+          "typeParameters": {
+            "type": "TSTypeParameterDeclaration",
+            "start":11,"end":14,"loc":{"start":{"line":1,"column":11},"end":{"line":1,"column":14}},
+            "params": [
+              {
+                "type": "TSTypeParameter",
+                "start":12,"end":13,"loc":{"start":{"line":1,"column":12},"end":{"line":1,"column":13}},
+                "name": {
+                  "type": "Identifier",
+                  "start":12,"end":13,"loc":{"start":{"line":1,"column":12},"end":{"line":1,"column":13},"identifierName":"T"},
+                  "name": "T"
+                }
+              }
+            ]
+          },
+          "params": [],
+          "returnType": {
+            "type": "TSTypeAnnotation",
+            "start":17,"end":26,"loc":{"start":{"line":1,"column":17},"end":{"line":1,"column":26}},
+            "typeAnnotation": {
+              "type": "TSNumberKeyword",
+              "start":20,"end":26,"loc":{"start":{"line":1,"column":20},"end":{"line":1,"column":26}}
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-3/input.ts

@@ -0,0 +1 @@
+type Foo = new <T>() => void;

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-3/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-3/output.json

@@ -0,0 +1,51 @@
+{
+  "type": "File",
+  "start":0,"end":29,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":29}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":29,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":29}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSTypeAliasDeclaration",
+        "start":0,"end":29,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":29}},
+        "id": {
+          "type": "Identifier",
+          "start":5,"end":8,"loc":{"start":{"line":1,"column":5},"end":{"line":1,"column":8},"identifierName":"Foo"},
+          "name": "Foo"
+        },
+        "typeAnnotation": {
+          "type": "TSConstructorType",
+          "start":11,"end":28,"loc":{"start":{"line":1,"column":11},"end":{"line":1,"column":28}},
+          "abstract": false,
+          "typeParameters": {
+            "type": "TSTypeParameterDeclaration",
+            "start":15,"end":18,"loc":{"start":{"line":1,"column":15},"end":{"line":1,"column":18}},
+            "params": [
+              {
+                "type": "TSTypeParameter",
+                "start":16,"end":17,"loc":{"start":{"line":1,"column":16},"end":{"line":1,"column":17}},
+                "name": {
+                  "type": "Identifier",
+                  "start":16,"end":17,"loc":{"start":{"line":1,"column":16},"end":{"line":1,"column":17},"identifierName":"T"},
+                  "name": "T"
+                }
+              }
+            ]
+          },
+          "params": [],
+          "returnType": {
+            "type": "TSTypeAnnotation",
+            "start":21,"end":28,"loc":{"start":{"line":1,"column":21},"end":{"line":1,"column":28}},
+            "typeAnnotation": {
+              "type": "TSVoidKeyword",
+              "start":24,"end":28,"loc":{"start":{"line":1,"column":24},"end":{"line":1,"column":28}}
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-4/input.ts

@@ -0,0 +1,3 @@
+interface Foo {
+  new<T>(a: string): string;
+}

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-4/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-4/output.json

@@ -0,0 +1,70 @@
+{
+  "type": "File",
+  "start":0,"end":46,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":46,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSInterfaceDeclaration",
+        "start":0,"end":46,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+        "id": {
+          "type": "Identifier",
+          "start":10,"end":13,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":13},"identifierName":"Foo"},
+          "name": "Foo"
+        },
+        "body": {
+          "type": "TSInterfaceBody",
+          "start":14,"end":46,"loc":{"start":{"line":1,"column":14},"end":{"line":3,"column":1}},
+          "body": [
+            {
+              "type": "TSConstructSignatureDeclaration",
+              "start":18,"end":44,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":28}},
+              "typeParameters": {
+                "type": "TSTypeParameterDeclaration",
+                "start":21,"end":24,"loc":{"start":{"line":2,"column":5},"end":{"line":2,"column":8}},
+                "params": [
+                  {
+                    "type": "TSTypeParameter",
+                    "start":22,"end":23,"loc":{"start":{"line":2,"column":6},"end":{"line":2,"column":7}},
+                    "name": {
+                      "type": "Identifier",
+                      "start":22,"end":23,"loc":{"start":{"line":2,"column":6},"end":{"line":2,"column":7},"identifierName":"T"},
+                      "name": "T"
+                    }
+                  }
+                ]
+              },
+              "params": [
+                {
+                  "type": "Identifier",
+                  "start":25,"end":34,"loc":{"start":{"line":2,"column":9},"end":{"line":2,"column":18},"identifierName":"a"},
+                  "name": "a",
+                  "typeAnnotation": {
+                    "type": "TSTypeAnnotation",
+                    "start":26,"end":34,"loc":{"start":{"line":2,"column":10},"end":{"line":2,"column":18}},
+                    "typeAnnotation": {
+                      "type": "TSStringKeyword",
+                      "start":28,"end":34,"loc":{"start":{"line":2,"column":12},"end":{"line":2,"column":18}}
+                    }
+                  }
+                }
+              ],
+              "returnType": {
+                "type": "TSTypeAnnotation",
+                "start":35,"end":43,"loc":{"start":{"line":2,"column":19},"end":{"line":2,"column":27}},
+                "typeAnnotation": {
+                  "type": "TSStringKeyword",
+                  "start":37,"end":43,"loc":{"start":{"line":2,"column":21},"end":{"line":2,"column":27}}
+                }
+              }
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-5/input.ts

@@ -0,0 +1,3 @@
+interface Foo {
+  foo<T>(x: number): void;
+}

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-5/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-parser/test/fixtures/typescript/interface/function-like-node-5/output.json

@@ -0,0 +1,77 @@
+{
+  "type": "File",
+  "start":0,"end":44,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":44,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSInterfaceDeclaration",
+        "start":0,"end":44,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+        "id": {
+          "type": "Identifier",
+          "start":10,"end":13,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":13},"identifierName":"Foo"},
+          "name": "Foo"
+        },
+        "body": {
+          "type": "TSInterfaceBody",
+          "start":14,"end":44,"loc":{"start":{"line":1,"column":14},"end":{"line":3,"column":1}},
+          "body": [
+            {
+              "type": "TSMethodSignature",
+              "start":18,"end":42,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":26}},
+              "key": {
+                "type": "Identifier",
+                "start":18,"end":21,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":5},"identifierName":"foo"},
+                "name": "foo"
+              },
+              "computed": false,
+              "typeParameters": {
+                "type": "TSTypeParameterDeclaration",
+                "start":21,"end":24,"loc":{"start":{"line":2,"column":5},"end":{"line":2,"column":8}},
+                "params": [
+                  {
+                    "type": "TSTypeParameter",
+                    "start":22,"end":23,"loc":{"start":{"line":2,"column":6},"end":{"line":2,"column":7}},
+                    "name": {
+                      "type": "Identifier",
+                      "start":22,"end":23,"loc":{"start":{"line":2,"column":6},"end":{"line":2,"column":7},"identifierName":"T"},
+                      "name": "T"
+                    }
+                  }
+                ]
+              },
+              "params": [
+                {
+                  "type": "Identifier",
+                  "start":25,"end":34,"loc":{"start":{"line":2,"column":9},"end":{"line":2,"column":18},"identifierName":"x"},
+                  "name": "x",
+                  "typeAnnotation": {
+                    "type": "TSTypeAnnotation",
+                    "start":26,"end":34,"loc":{"start":{"line":2,"column":10},"end":{"line":2,"column":18}},
+                    "typeAnnotation": {
+                      "type": "TSNumberKeyword",
+                      "start":28,"end":34,"loc":{"start":{"line":2,"column":12},"end":{"line":2,"column":18}}
+                    }
+                  }
+                }
+              ],
+              "returnType": {
+                "type": "TSTypeAnnotation",
+                "start":35,"end":41,"loc":{"start":{"line":2,"column":19},"end":{"line":2,"column":25}},
+                "typeAnnotation": {
+                  "type": "TSVoidKeyword",
+                  "start":37,"end":41,"loc":{"start":{"line":2,"column":21},"end":{"line":2,"column":25}}
+                }
+              },
+              "kind": "method"
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-ambiguous-babel-7/input.ts

@@ -0,0 +1,6 @@
+interface Foo {
+  get
+  foo(): string;
+  set
+  bar(v);
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-ambiguous-babel-7/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": false
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-ambiguous-babel-7/output.json

@@ -0,0 +1,86 @@
+{
+  "type": "File",
+  "start":0,"end":56,"loc":{"start":{"line":1,"column":0},"end":{"line":6,"column":1}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":56,"loc":{"start":{"line":1,"column":0},"end":{"line":6,"column":1}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSInterfaceDeclaration",
+        "start":0,"end":56,"loc":{"start":{"line":1,"column":0},"end":{"line":6,"column":1}},
+        "id": {
+          "type": "Identifier",
+          "start":10,"end":13,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":13},"identifierName":"Foo"},
+          "name": "Foo"
+        },
+        "body": {
+          "type": "TSInterfaceBody",
+          "start":14,"end":56,"loc":{"start":{"line":1,"column":14},"end":{"line":6,"column":1}},
+          "body": [
+            {
+              "type": "TSPropertySignature",
+              "start":18,"end":21,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":5}},
+              "key": {
+                "type": "Identifier",
+                "start":18,"end":21,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":5},"identifierName":"get"},
+                "name": "get"
+              },
+              "computed": false
+            },
+            {
+              "type": "TSMethodSignature",
+              "start":24,"end":38,"loc":{"start":{"line":3,"column":2},"end":{"line":3,"column":16}},
+              "key": {
+                "type": "Identifier",
+                "start":24,"end":27,"loc":{"start":{"line":3,"column":2},"end":{"line":3,"column":5},"identifierName":"foo"},
+                "name": "foo"
+              },
+              "computed": false,
+              "parameters": [],
+              "typeAnnotation": {
+                "type": "TSTypeAnnotation",
+                "start":29,"end":37,"loc":{"start":{"line":3,"column":7},"end":{"line":3,"column":15}},
+                "typeAnnotation": {
+                  "type": "TSStringKeyword",
+                  "start":31,"end":37,"loc":{"start":{"line":3,"column":9},"end":{"line":3,"column":15}}
+                }
+              },
+              "kind": "method"
+            },
+            {
+              "type": "TSPropertySignature",
+              "start":41,"end":44,"loc":{"start":{"line":4,"column":2},"end":{"line":4,"column":5}},
+              "key": {
+                "type": "Identifier",
+                "start":41,"end":44,"loc":{"start":{"line":4,"column":2},"end":{"line":4,"column":5},"identifierName":"set"},
+                "name": "set"
+              },
+              "computed": false
+            },
+            {
+              "type": "TSMethodSignature",
+              "start":47,"end":54,"loc":{"start":{"line":5,"column":2},"end":{"line":5,"column":9}},
+              "key": {
+                "type": "Identifier",
+                "start":47,"end":50,"loc":{"start":{"line":5,"column":2},"end":{"line":5,"column":5},"identifierName":"bar"},
+                "name": "bar"
+              },
+              "computed": false,
+              "parameters": [
+                {
+                  "type": "Identifier",
+                  "start":51,"end":52,"loc":{"start":{"line":5,"column":6},"end":{"line":5,"column":7},"identifierName":"v"},
+                  "name": "v"
+                }
+              ],
+              "kind": "method"
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-ambiguous/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-ambiguous/output.json

@@ -38,8 +38,8 @@
                 "name": "foo"
               },
               "computed": false,
-              "parameters": [],
+              "params": [],
-              "typeAnnotation": {
+              "returnType": {
                 "type": "TSTypeAnnotation",
                 "start":29,"end":37,"loc":{"start":{"line":3,"column":7},"end":{"line":3,"column":15}},
                 "typeAnnotation": {
@@ -68,7 +68,7 @@
                 "name": "bar"
               },
               "computed": false,
-              "parameters": [
+              "params": [
                 {
                   "type": "Identifier",
                   "start":51,"end":52,"loc":{"start":{"line":5,"column":6},"end":{"line":5,"column":7},"identifierName":"v"},

packages/babel-parser/test/fixtures/typescript/interface/get-set-babel-7/input.ts

@@ -0,0 +1,4 @@
+interface Foo {
+  get foo(): string;
+  set bar(v);
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-babel-7/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": false
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-babel-7/output.json

@@ -0,0 +1,66 @@
+{
+  "type": "File",
+  "start":0,"end":52,"loc":{"start":{"line":1,"column":0},"end":{"line":4,"column":1}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":52,"loc":{"start":{"line":1,"column":0},"end":{"line":4,"column":1}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSInterfaceDeclaration",
+        "start":0,"end":52,"loc":{"start":{"line":1,"column":0},"end":{"line":4,"column":1}},
+        "id": {
+          "type": "Identifier",
+          "start":10,"end":13,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":13},"identifierName":"Foo"},
+          "name": "Foo"
+        },
+        "body": {
+          "type": "TSInterfaceBody",
+          "start":14,"end":52,"loc":{"start":{"line":1,"column":14},"end":{"line":4,"column":1}},
+          "body": [
+            {
+              "type": "TSMethodSignature",
+              "start":18,"end":36,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":20}},
+              "kind": "get",
+              "key": {
+                "type": "Identifier",
+                "start":22,"end":25,"loc":{"start":{"line":2,"column":6},"end":{"line":2,"column":9},"identifierName":"foo"},
+                "name": "foo"
+              },
+              "computed": false,
+              "parameters": [],
+              "typeAnnotation": {
+                "type": "TSTypeAnnotation",
+                "start":27,"end":35,"loc":{"start":{"line":2,"column":11},"end":{"line":2,"column":19}},
+                "typeAnnotation": {
+                  "type": "TSStringKeyword",
+                  "start":29,"end":35,"loc":{"start":{"line":2,"column":13},"end":{"line":2,"column":19}}
+                }
+              }
+            },
+            {
+              "type": "TSMethodSignature",
+              "start":39,"end":50,"loc":{"start":{"line":3,"column":2},"end":{"line":3,"column":13}},
+              "kind": "set",
+              "key": {
+                "type": "Identifier",
+                "start":43,"end":46,"loc":{"start":{"line":3,"column":6},"end":{"line":3,"column":9},"identifierName":"bar"},
+                "name": "bar"
+              },
+              "computed": false,
+              "parameters": [
+                {
+                  "type": "Identifier",
+                  "start":47,"end":48,"loc":{"start":{"line":3,"column":10},"end":{"line":3,"column":11},"identifierName":"v"},
+                  "name": "v"
+                }
+              ]
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-optional-parameter-babel-7/input.ts

@@ -0,0 +1,3 @@
+interface Foo {
+  set bar(foo?: string);
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-optional-parameter-babel-7/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": false
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-optional-parameter-babel-7/output.json

@@ -0,0 +1,58 @@
+{
+  "type": "File",
+  "start":0,"end":42,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+  "errors": [
+    "SyntaxError: A 'set' accessor cannot have an optional parameter. (3:1)"
+  ],
+  "program": {
+    "type": "Program",
+    "start":0,"end":42,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSInterfaceDeclaration",
+        "start":0,"end":42,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+        "id": {
+          "type": "Identifier",
+          "start":10,"end":13,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":13},"identifierName":"Foo"},
+          "name": "Foo"
+        },
+        "body": {
+          "type": "TSInterfaceBody",
+          "start":14,"end":42,"loc":{"start":{"line":1,"column":14},"end":{"line":3,"column":1}},
+          "body": [
+            {
+              "type": "TSMethodSignature",
+              "start":18,"end":40,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":24}},
+              "key": {
+                "type": "Identifier",
+                "start":22,"end":25,"loc":{"start":{"line":2,"column":6},"end":{"line":2,"column":9},"identifierName":"bar"},
+                "name": "bar"
+              },
+              "computed": false,
+              "kind": "set",
+              "parameters": [
+                {
+                  "type": "Identifier",
+                  "start":26,"end":38,"loc":{"start":{"line":2,"column":10},"end":{"line":2,"column":22},"identifierName":"foo"},
+                  "name": "foo",
+                  "optional": true,
+                  "typeAnnotation": {
+                    "type": "TSTypeAnnotation",
+                    "start":30,"end":38,"loc":{"start":{"line":2,"column":14},"end":{"line":2,"column":22}},
+                    "typeAnnotation": {
+                      "type": "TSStringKeyword",
+                      "start":32,"end":38,"loc":{"start":{"line":2,"column":16},"end":{"line":2,"column":22}}
+                    }
+                  }
+                }
+              ]
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-optional-parameter/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-optional-parameter/output.json

@@ -32,7 +32,7 @@
               },
               "computed": false,
               "kind": "set",
-              "parameters": [
+              "params": [
                 {
                   "type": "Identifier",
                   "start":26,"end":38,"loc":{"start":{"line":2,"column":10},"end":{"line":2,"column":22},"identifierName":"foo"},

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-parameters-babel-7/input.ts

@@ -0,0 +1,4 @@
+interface Foo {
+  get foo(param): string;
+  set foo();
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-parameters-babel-7/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": false
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-parameters-babel-7/output.json

@@ -0,0 +1,70 @@
+{
+  "type": "File",
+  "start":0,"end":56,"loc":{"start":{"line":1,"column":0},"end":{"line":4,"column":1}},
+  "errors": [
+    "SyntaxError: A 'get' accesor must not have any formal parameters. (3:5)",
+    "SyntaxError: A 'set' accesor must have exactly one formal parameter. (4:1)"
+  ],
+  "program": {
+    "type": "Program",
+    "start":0,"end":56,"loc":{"start":{"line":1,"column":0},"end":{"line":4,"column":1}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSInterfaceDeclaration",
+        "start":0,"end":56,"loc":{"start":{"line":1,"column":0},"end":{"line":4,"column":1}},
+        "id": {
+          "type": "Identifier",
+          "start":10,"end":13,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":13},"identifierName":"Foo"},
+          "name": "Foo"
+        },
+        "body": {
+          "type": "TSInterfaceBody",
+          "start":14,"end":56,"loc":{"start":{"line":1,"column":14},"end":{"line":4,"column":1}},
+          "body": [
+            {
+              "type": "TSMethodSignature",
+              "start":18,"end":41,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":25}},
+              "key": {
+                "type": "Identifier",
+                "start":22,"end":25,"loc":{"start":{"line":2,"column":6},"end":{"line":2,"column":9},"identifierName":"foo"},
+                "name": "foo"
+              },
+              "computed": false,
+              "kind": "get",
+              "parameters": [
+                {
+                  "type": "Identifier",
+                  "start":26,"end":31,"loc":{"start":{"line":2,"column":10},"end":{"line":2,"column":15},"identifierName":"param"},
+                  "name": "param"
+                }
+              ],
+              "typeAnnotation": {
+                "type": "TSTypeAnnotation",
+                "start":32,"end":40,"loc":{"start":{"line":2,"column":16},"end":{"line":2,"column":24}},
+                "typeAnnotation": {
+                  "type": "TSStringKeyword",
+                  "start":34,"end":40,"loc":{"start":{"line":2,"column":18},"end":{"line":2,"column":24}}
+                }
+              }
+            },
+            {
+              "type": "TSMethodSignature",
+              "start":44,"end":54,"loc":{"start":{"line":3,"column":2},"end":{"line":3,"column":12}},
+              "key": {
+                "type": "Identifier",
+                "start":48,"end":51,"loc":{"start":{"line":3,"column":6},"end":{"line":3,"column":9},"identifierName":"foo"},
+                "name": "foo"
+              },
+              "computed": false,
+              "kind": "set",
+              "parameters": []
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-parameters/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-parameters/output.json

@@ -33,14 +33,14 @@
               },
               "computed": false,
               "kind": "get",
-              "parameters": [
+              "params": [
                 {
                   "type": "Identifier",
                   "start":26,"end":31,"loc":{"start":{"line":2,"column":10},"end":{"line":2,"column":15},"identifierName":"param"},
                   "name": "param"
                 }
               ],
-              "typeAnnotation": {
+              "returnType": {
                 "type": "TSTypeAnnotation",
                 "start":32,"end":40,"loc":{"start":{"line":2,"column":16},"end":{"line":2,"column":24}},
                 "typeAnnotation": {
@@ -59,7 +59,7 @@
               },
               "computed": false,
               "kind": "set",
-              "parameters": []
+              "params": []
             }
           ]
         }

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-reset-parameter-babel-7/input.ts

@@ -0,0 +1,3 @@
+interface Foo {
+  set bar(...v);
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-reset-parameter-babel-7/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-reset-parameter-babel-7/output.json

@@ -0,0 +1,53 @@
+{
+  "type": "File",
+  "start":0,"end":34,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+  "errors": [
+    "SyntaxError: A 'set' accessor cannot have rest parameter. (3:1)"
+  ],
+  "program": {
+    "type": "Program",
+    "start":0,"end":34,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSInterfaceDeclaration",
+        "start":0,"end":34,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
+        "id": {
+          "type": "Identifier",
+          "start":10,"end":13,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":13},"identifierName":"Foo"},
+          "name": "Foo"
+        },
+        "body": {
+          "type": "TSInterfaceBody",
+          "start":14,"end":34,"loc":{"start":{"line":1,"column":14},"end":{"line":3,"column":1}},
+          "body": [
+            {
+              "type": "TSMethodSignature",
+              "start":18,"end":32,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":16}},
+              "key": {
+                "type": "Identifier",
+                "start":22,"end":25,"loc":{"start":{"line":2,"column":6},"end":{"line":2,"column":9},"identifierName":"bar"},
+                "name": "bar"
+              },
+              "computed": false,
+              "kind": "set",
+              "params": [
+                {
+                  "type": "RestElement",
+                  "start":26,"end":30,"loc":{"start":{"line":2,"column":10},"end":{"line":2,"column":14}},
+                  "argument": {
+                    "type": "Identifier",
+                    "start":29,"end":30,"loc":{"start":{"line":2,"column":13},"end":{"line":2,"column":14},"identifierName":"v"},
+                    "name": "v"
+                  }
+                }
+              ]
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-reset-parameter/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-reset-parameter/output.json

@@ -32,7 +32,7 @@
               },
               "computed": false,
               "kind": "set",
-              "parameters": [
+              "params": [
                 {
                   "type": "RestElement",
                   "start":26,"end":30,"loc":{"start":{"line":2,"column":10},"end":{"line":2,"column":14}},

packages/babel-parser/test/fixtures/typescript/interface/get-set-invalid-return-types-babel-7/input.ts

@@ -0,0 +1,3 @@
+interface Foo {
+  set foo(param): string;
+}