Merge branch 'main' into clarify-warning-source

.circleci/config.yml

@@ -1,23 +1,13 @@
 version: 2.1
 
 aliases:
-  - &restore-node-modules-cache
-    keys:
-      - v1-yarn-deps-{{ checksum "yarn.lock" }}
-
   - &restore-yarn-cache
-    keys:
-      - v1-yarn-cache
-
-  - &save-node-modules-cache
-    paths:
-      - node_modules
-    key: v1-yarn-deps-{{ checksum "yarn.lock" }}
+    key: v2-yarn-cache-{{ checksum "yarn.lock" }}
 
   - &save-yarn-cache
     paths:
-      - ~/.yarn-cache
-    key: v1-yarn-cache
+      - ~/.yarn/berry/cache
+    key: v2-yarn-cache-{{ checksum "yarn.lock" }}
 
   - &artifact_babel
     path: ~/babel/packages/babel-standalone/babel.js
@@ -54,7 +44,6 @@ jobs:
     steps:
       - checkout
       - restore_cache: *restore-yarn-cache
-      - restore_cache: *restore-node-modules-cache
         # Builds babel-standalone with the regular Babel config
         # test-ci-coverage doesn't test babel-standalone, as trying to gather coverage
       - run: IS_PUBLISH=true make -j build-standalone-ci
@@ -63,37 +52,37 @@ jobs:
       - run: yarn jest "\-standalone/test"
       - store_artifacts: *artifact_babel
       - store_artifacts: *artifact_babel_min
-      - save_cache: *save-node-modules-cache
       - save_cache: *save-yarn-cache
 
   test262:
     executor: node-executor
     steps:
       - checkout
       - run:
-          name: Sync with latest master branch (only on PRs)
+          name: Sync with latest main branch (only on PRs)
           command: |
             if [ -n "$CIRCLE_PULL_REQUEST" ]
             then
-              git fetch origin refs/pull/$CIRCLE_PR_NUMBER/merge
+              # $CIRCLE_PR_NUMBER is not always defined:
+              # https://support.circleci.com/hc/en-us/articles/360047521451-Why-is-CIRCLE-PR-NUMBER-empty-
+              git fetch origin refs/pull/${CIRCLE_PULL_REQUEST##*/}/merge
               git checkout -qf FETCH_HEAD
             fi
       - restore_cache: *restore-yarn-cache
-      - restore_cache: *restore-node-modules-cache
       - run:
           name: Build Babel
           command: BABEL_ENV=test make bootstrap
       - run:
           name: Setup Test Runner
           command: |
-            git clone --recurse-submodules https://github.com/babel/babel-test262-runner
+            git clone --depth=1 --recurse-submodules https://github.com/babel/babel-test262-runner
             cd babel-test262-runner
             npm ci
             npm i tap-mocha-reporter --save-dev
             node lib/download-node
       - run:
-          name: Download master branch Test262 artifact
-          command: node lib/download-master-artifact ~/master.tap
+          name: Download main branch Test262 artifact
+          command: node lib/download-main-artifact ~/test262-main.tap
           <<: *test262_workdir
       - run:
           name: Run Test262
@@ -106,33 +95,33 @@ jobs:
             cat ~/test262.tap | $(npm bin)/tap-mocha-reporter spec || true
           <<: *test262_workdir
       - run:
-          name: Compare previous master branch & current job results
+          name: Compare previous main branch & current job results
           command: |
             mkdir -p ~/test-results/test262
-            node lib/compare-results ~/master.tap ~/test262.tap | tee ~/diff.tap
+            node lib/compare-results ~/test262-main.tap ~/test262.tap | tee ~/diff.tap
           <<: *test262_workdir
       - store_artifacts: *artifact_test262_diff_tap
       - run:
-          name: Output comparision results and report to CircleCI
+          name: Output comparison results and report to CircleCI
           command: |
             mkdir -p ~/test-results/test262
             cat ~/diff.tap | $(npm bin)/tap-merge | $(npm bin)/tap-mocha-reporter xunit | tee ~/test-results/test262/results.xml
           <<: *test262_workdir
       - store_test_results: *artifact_test262_xunit
-      - save_cache: *save-node-modules-cache
       - save_cache: *save-yarn-cache
 
   publish-verdaccio:
     executor: node-executor
     steps:
       - checkout
-      - run: yarn install
+      - restore_cache: *restore-yarn-cache
       - run: ./scripts/integration-tests/publish-local.sh
       - persist_to_workspace:
           root: /tmp/verdaccio-workspace
           paths:
             - storage
             - htpasswd
+      - save_cache: *save-yarn-cache
 
   e2e-babel:
     executor: node-executor
@@ -166,33 +155,51 @@ jobs:
           at: /tmp/verdaccio-workspace
       - run: ./scripts/integration-tests/e2e-vue-cli.sh
 
+  e2e-jest:
+    executor: node-executor
+    steps:
+      - checkout
+      - attach_workspace:
+          at: /tmp/verdaccio-workspace
+      - run: ./scripts/integration-tests/e2e-jest.sh
+
 workflows:
   version: 2
   build-standalone:
     jobs:
       - build-standalone
-  test262-master:
+  test262:
     jobs:
       - test262:
           filters:
             branches:
               only:
-                - master
-  test262:
+                - main
+                - next-8-dev
+                - next-8-rebased
+          context: babel-test262
+  test262-pr:
     jobs:
       - approve-test262-run:
           type: approval
           filters:
             branches:
               ignore:
+                - main
                 - master
+                - next-8-dev
+                - next-8-rebased
       - test262:
           requires:
             - approve-test262-run
           filters:
             branches:
               ignore:
+                - main
                 - master
+                - next-8-dev
+                - next-8-rebased
+          context: babel-test262
   e2e:
     jobs:
       - publish-verdaccio
@@ -208,4 +215,6 @@ workflows:
       - e2e-vue-cli:
           requires:
             - publish-verdaccio
-
+      - e2e-jest:
+          requires:
+            - publish-verdaccio

.codesandbox/ci.json

@@ -1,6 +1,5 @@
 {
-  "installCommand": "codesandbox",
-  "buildCommand": false,
+  "buildCommand": "codesandbox:build",
   "sandboxes": ["7s08o", "vhm64"],
   "packages": ["packages/*"]
 }

.eslintrc.js

@@ -1,24 +1,42 @@
+"use strict";
+
 const path = require("path");
 
 module.exports = {
   root: true,
-  plugins: ["prettier", "@babel/development", "import", "jest"],
-  // replace it by `@babel/internal` when `@babel/eslint-config-internal` is published
-  extends: path.resolve(__dirname, "eslint/babel-eslint-config-internal"),
+  plugins: [
+    "import",
+    "jest",
+    "prettier",
+    "@babel/development",
+    "@babel/development-internal",
+  ],
+  extends: "@babel/internal",
   rules: {
     "prettier/prettier": "error",
-    // TODO: remove after babel-eslint-config-internal is fully integrated into this repository.
-    "max-len": "off",
   },
   env: {
     node: true,
   },
   overrides: [
+    {
+      files: ["**/*.ts"],
+      parser: "@typescript-eslint/parser",
+      plugins: ["@typescript-eslint"],
+      rules: {
+        "no-unused-vars": "off",
+        "@typescript-eslint/no-unused-vars": "error",
+        "no-dupe-class-members": "off",
+        "@typescript-eslint/no-dupe-class-members": "error",
+        "no-undef": "off",
+        "no-redeclare": "off",
+      },
+    },
     {
       files: [
-        "packages/*/src/**/*.js",
-        "codemods/*/src/**/*.js",
-        "eslint/*/src/**/*.js",
+        "packages/*/src/**/*.{js,ts}",
+        "codemods/*/src/**/*.{js,ts}",
+        "eslint/*/src/**/*.{js,ts}",
       ],
       rules: {
         "@babel/development/no-undefined-identifier": "error",
@@ -32,7 +50,7 @@ module.exports = {
         "packages/*/test/**/*.js",
         "codemods/*/test/**/*.js",
         "eslint/*/test/**/*.js",
-        "packages/babel-helper-transform-fixture-test-runner/src/helpers.js",
+        "packages/babel-helper-transform-fixture-test-runner/src/helpers.{ts,js}",
         "test/**/*.js",
       ],
       env: {
@@ -44,16 +62,30 @@ module.exports = {
         "jest/no-identical-title": "off",
         "jest/no-standalone-expect": "off",
         "jest/no-test-callback": "off",
-        "jest/valid-describe": "off"
-      }
+        "jest/valid-describe": "off",
+      },
     },
     {
-      files: ["packages/babel-plugin-*/src/index.js"],
+      files: ["packages/babel-plugin-*/src/index.{js,ts}"],
       excludedFiles: ["packages/babel-plugin-transform-regenerator/**/*.js"],
       rules: {
         "@babel/development/plugin-name": "error",
         eqeqeq: ["error", "always", { null: "ignore" }],
       },
     },
+    {
+      files: ["packages/babel-parser/src/**/*.{js,ts}"],
+      rules: {
+        "@babel/development-internal/dry-error-messages": [
+          "error",
+          {
+            errorModule: path.resolve(
+              __dirname,
+              "packages/babel-parser/src/parser/error.js"
+            ),
+          },
+        ],
+      },
+    },
   ],
 };

.flowconfig

@@ -16,6 +16,7 @@ lib/parser.js
 lib/third-party-libs.js.flow
 lib/preset-modules.js.flow
 packages/babel-types/lib/index.js.flow
+lib/babel-packages.js.flow
 
 [options]
 include_warnings=true
@@ -27,4 +28,7 @@ suppress_type=$FlowSubtype
 esproposal.export_star_as=enable
 esproposal.optional_chaining=enable
 esproposal.nullish_coalescing=enable
-module.name_mapper='^@babel\/\([a-zA-Z0-9_\-]+\)$' -> '<PROJECT_ROOT>/packages/babel-\1/src/index'
+module.name_mapper='^@babel/\([a-zA-Z0-9_-]+\)$' -> '<PROJECT_ROOT>/packages/babel-\1/src/index'
+; Todo: can not make it works, 🤷‍♂️
+; module.name_mapper='^@babel/plugin-syntax-import-meta$' -> '<PROJECT_ROOT>/packages/babel-standalone/node_modules/@babel/plugin-syntax-import-meta/lib/index'
+module.ignore_non_literal_requires=true

.git-blame-ignore-revs

@@ -0,0 +1,11 @@
+# git-blame ignored revisions
+# To configure, run
+#   git config blame.ignoreRevsFile .git-blame-ignore-revs
+# Requires Git > 2.23
+# See https://git-scm.com/docs/git-blame#Documentation/git-blame.txt---ignore-revs-fileltfilegt
+
+# Use prettier (#600)
+5180ecdca48e486b4b0f347fcbd752f865df5e55
+
+# Update prettier to v2 (#11579)
+41085248560b1403b8d0f99f108491e679531c6c

.github/ISSUE_TEMPLATE/Bug_report.md

@@ -14,11 +14,11 @@ assignees: ''
 
 <!--
 @babel/eslint-parser:
-  If you are having issues with JSX you might want to check out eslint-plugin-react. If there's an issue with new experimental syntax you might need check if it's supported by @babel/eslint-plugin.
+  If you are having issues with JSX you might want to check out eslint-plugin-react. If there's an issue with new experimental syntax you might need to check if it's supported by @babel/eslint-plugin.
 -->
 
 **Current behavior**
-A clear and concise description of the behavior.
+<!-- A clear and concise description of the behavior. -->
 
 - [REPL](babeljs.io/repl), [Codesandbox](https://codesandbox.io/s/babel-repl-custom-plugin-7s08o?file=/src/index.js), or GitHub Repo helps!
 
@@ -29,7 +29,7 @@ var your => (code) => here;
 ```
 
 **Expected behavior**
-A clear and concise description of what you expected to happen (or code).
+<!-- A clear and concise description of what you expected to happen (or code). -->
 
 **Babel Configuration (babel.config.js, .babelrc, package.json#babel, cli command, .eslintrc)**
 - Filename: `babel.config.js`
@@ -55,4 +55,4 @@ A clear and concise description of what you expected to happen (or code).
 <!--- If you have suggestions on a fix for the bug -->
 
 **Additional context**
-Add any other context about the problem here. Or a screenshot if applicable
+<!-- Add any other context about the problem here. Or a screenshot if applicable -->

.github/ISSUE_TEMPLATE/Feature_request.md

@@ -13,11 +13,11 @@ assignees: ''
 - [ ] I would like to work on this feature!
 
 **Is your feature request related to a problem?**
-A concise description of what the problem is. Ex. I have an issue when [...]
+<!-- A concise description of what the problem is. Ex. I have an issue when [...] -->
 
 **Describe the solution you'd like**
 
 **Describe alternatives you've considered**.
 
 **Documentation, Adoption, Migration Strategy**
-If you can, explain how users will be able to use this and how it might be documented. Maybe a mock-up?
+<!-- If you can, explain how users will be able to use this and how it might be documented. Maybe a mock-up? -->

.github/ISSUE_TEMPLATE/config.yml

@@ -5,7 +5,7 @@ contact_links:
     about: You may have an npm error related to proxies/caching.
   - name: 🗣 Ask a Question, Discuss
     url: https://github.com/babel/babel/discussions
-    about: How does X work 🤔? I made this! I have an idea..
+    about: How does X work 🤔? I made this! I have an idea...
   - name: 💡 Propose an RFC
     url: https://github.com/babel/rfcs
     about: To suggest a new option or substantial change.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,6 +1,6 @@
 <!--
 Before making a PR, please read our contributing guidelines
-https://github.com/babel/babel/blob/master/CONTRIBUTING.md
+https://github.com/babel/babel/blob/main/CONTRIBUTING.md
 
 Please note that the Babel Team requires two approvals before merging most PRs.