Managed to publish a new version of csx-babel. Woo!

(cherry picked from commit e7961a08a8)

.babelignore

@@ -1,5 +0,0 @@
-# Ensure babel-register won't compile fixtures, or try to recompile compiled code.
-packages/*/test/fixtures
-packages/*/lib
-packages/babel-standalone/babel.js
-packages/babel-preset-env-standalone/babel-preset-env.js

.babelrc.js

@@ -1,80 +0,0 @@
-"use strict";
-
-module.exports = function(api) {
-  const env = api.env();
-
-  const includeCoverage = process.env.BABEL_COVERAGE === "true";
-
-  const envOpts = {
-    loose: true,
-    modules: false,
-    exclude: ["transform-typeof-symbol"],
-  };
-
-  let convertESM = true;
-
-  switch (env) {
-    // Configs used during bundling builds.
-    case "babylon":
-    case "standalone":
-      convertESM = false;
-      break;
-    case "production":
-      // Config during builds before publish.
-      break;
-    case "development":
-      envOpts.debug = true;
-      envOpts.targets = {
-        node: "current",
-      };
-      break;
-    case "test":
-      envOpts.targets = {
-        node: "current",
-      };
-      break;
-  }
-
-  const config = {
-    comments: false,
-    presets: [["@babel/env", envOpts]],
-    plugins: [
-      // TODO: Use @babel/preset-flow when
-      // https://github.com/babel/babel/issues/7233 is fixed
-      "@babel/plugin-transform-flow-strip-types",
-      ["@babel/proposal-class-properties", { loose: true }],
-      "@babel/proposal-export-namespace-from",
-      "@babel/proposal-numeric-separator",
-      ["@babel/proposal-object-rest-spread", { useBuiltIns: true }],
-
-      // Explicitly use the lazy version of CommonJS modules.
-      convertESM ? ["@babel/transform-modules-commonjs", { lazy: true }] : null,
-    ].filter(Boolean),
-    overrides: [
-      {
-        test: "packages/babylon",
-        plugins: [
-          "babel-plugin-transform-charcodes",
-          ["@babel/transform-for-of", { assumeArray: true }],
-        ],
-      },
-      {
-        test: "./packages/babel-register",
-        plugins: [
-          // Override the root options to disable lazy imports for babel-register
-          // because otherwise the require hook will try to lazy-import things
-          // leading to dependency cycles.
-          convertESM ? "@babel/transform-modules-commonjs" : null,
-        ].filter(Boolean),
-      },
-    ],
-  };
-
-  // we need to do this as long as we do not test everything from source
-  if (includeCoverage) {
-    config.auxiliaryCommentBefore = "istanbul ignore next";
-    config.plugins.push("babel-plugin-istanbul");
-  }
-
-  return config;
-};

.circleci/config.yml

@@ -1,4 +1,5 @@
-version: 2
+version: 2.1
+
 aliases:
   - &restore-node-modules-cache
     keys:
@@ -18,11 +19,6 @@ aliases:
       - ~/.yarn-cache
     key: v1-yarn-cache
 
-  - &yarn-install
-    run: |
-      sudo npm i -g yarn@^1.5.1
-      yarn --version
-
   - &artifact_babel
     path: ~/babel/packages/babel-standalone/babel.js
 
@@ -35,27 +31,178 @@ aliases:
   - &artifact_env_min
     path: ~/babel/packages/babel-preset-env-standalone/babel-preset-env.min.js
 
-jobs:
-  build:
-    working_directory: ~/babel
+  - &test262_workdir
+    working_directory: ~/babel/babel-test262-runner
+
+  - &artifact_test262_tap
+    path: ~/test262.tap
+
+  - &artifact_test262_xunit
+    path: ~/test-results
+
+  - &artifact_test262_diff_tap
+    path: ~/diff.tap
+
+executors:
+  node-executor:
     docker:
-      - image: circleci/node:9
+      - image: circleci/node:13
+    working_directory: ~/babel
+  # e2e-vue-cli test requires chromium
+  node-browsers-executor:
+    docker:
+      - image: circleci/node:13-browsers
+    working_directory: ~/babel
+
+jobs:
+  build-standalone:
+    executor: node-executor
     steps:
       - checkout
-      - restore-cache: *restore-yarn-cache
-      - restore-cache: *restore-node-modules-cache
-      - *yarn-install
-      - run: make test-ci-coverage
-      # Builds babel-standalone with the regular Babel config
-      - run: make build
-      # test-ci-coverage doesn't test babel-standalone, as trying to gather coverage
-      # data for a JS file that's several megabytes large is bound to fail. Here,
-      # we just run the babel-standalone test separately.
-      - run: ./node_modules/.bin/jest packages/babel-standalone/test/
-      - run: ./node_modules/.bin/jest packages/babel-preset-env-standalone/test/
+      - 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
+        # data for a JS file that's several megabytes large is bound to fail. Here,
+        # we just run the babel-standalone test separately.
+      - run: yarn jest "\-standalone/test"
       - store_artifacts: *artifact_babel
       - store_artifacts: *artifact_babel_min
       - store_artifacts: *artifact_env
       - store_artifacts: *artifact_env_min
       - save_cache: *save-node-modules-cache
-      - save_cache: *save-yarn-cache
+      - save_cache: *save-yarn-cache
+
+  test262:
+    executor: node-executor
+    steps:
+      - checkout
+      - run:
+          name: Sync with latest master branch (only on PRs)
+          command: |
+            if [ -n "$CIRCLE_PULL_REQUEST" ]
+            then
+              git fetch origin refs/pull/$CIRCLE_PR_NUMBER/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
+            cd babel-test262-runner
+            yarn
+            yarn add tap-mocha-reporter --dev
+            node lib/download-node
+      - run:
+          name: Download master branch Test262 artifact
+          command: node lib/download-master-artifact ~/master.tap
+          <<: *test262_workdir
+      - run:
+          name: Run Test262
+          command: BABEL_PATH=.. node lib/run-tests I_AM_SURE | tee ~/test262.tap
+          <<: *test262_workdir
+      - store_artifacts: *artifact_test262_tap
+      - run:
+          name: Output Test262 results
+          command: |
+            cat ~/test262.tap | $(npm bin)/tap-mocha-reporter spec || true
+          <<: *test262_workdir
+      - run:
+          name: Compare previous master branch & current job results
+          command: |
+            mkdir -p ~/test-results/test262
+            node lib/compare-results ~/master.tap ~/test262.tap | tee ~/diff.tap
+          <<: *test262_workdir
+      - store_artifacts: *artifact_test262_diff_tap
+      - run:
+          name: Output comparision 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
+      - run: ./scripts/integration-tests/publish-local.sh
+      - persist_to_workspace:
+          root: /tmp/verdaccio-workspace
+          paths:
+            - storage
+            - htpasswd
+
+  e2e-babel:
+    executor: node-executor
+    steps:
+      - checkout
+      - attach_workspace:
+          at: /tmp/verdaccio-workspace
+      - run: ./scripts/integration-tests/e2e-babel.sh
+
+  e2e-create-react-app:
+    executor: node-executor
+    steps:
+      - checkout
+      - attach_workspace:
+          at: /tmp/verdaccio-workspace
+      - run: ./scripts/integration-tests/e2e-create-react-app.sh
+
+  e2e-vue-cli:
+    executor: node-browsers-executor
+    steps:
+      - checkout
+      - attach_workspace:
+          at: /tmp/verdaccio-workspace
+      - run: ./scripts/integration-tests/e2e-vue-cli.sh
+
+workflows:
+  version: 2
+  build-standalone:
+    jobs:
+      - build-standalone
+  test262-master:
+    jobs:
+      - test262:
+          filters:
+            branches:
+              only:
+                - master
+  test262:
+    jobs:
+      - approve-test262-run:
+          type: approval
+          filters:
+            branches:
+              ignore:
+                - master
+      - test262:
+          requires:
+            - approve-test262-run
+          filters:
+            branches:
+              ignore:
+                - master
+  e2e:
+    jobs:
+      - publish-verdaccio
+      - e2e-babel:
+          requires:
+            - publish-verdaccio
+      - e2e-create-react-app:
+          requires:
+            - publish-verdaccio
+      - e2e-vue-cli:
+          requires:
+            - publish-verdaccio
+

.codesandbox/ci.json

@@ -0,0 +1,5 @@
+{
+  "installCommand": "bootstrap",
+  "buildCommand": false,
+  "sandboxes": ["kypop"]
+}

.editorconfig

@@ -6,9 +6,12 @@ charset = utf-8
 trim_trailing_whitespace = true
 end_of_line = lf
 
-[*.{js,json}]
+[*.{js,json,ts,tsx}]
 indent_style = space
 indent_size = 2
 
+[Makefile]
+indent_style = tab
+
 [*.{md,markdown}]
 trim_trailing_whitespace = false

.eslintignore

@@ -1,9 +1,12 @@
 /lib
 /build
+/.git
 package.json
+lerna.json
 packages/babel-runtime
-!packages/babel-runtime/scripts
-!packages/babel-runtime/core-js.js
+!packages/babel-plugin-transform-runtime/scripts
+packages/babel-runtime-corejs2
+packages/babel-runtime-corejs3
 packages/*/node_modules
 packages/*/lib
 packages/*/dist
@@ -14,10 +17,15 @@ codemods/*/lib
 codemods/*/dist
 codemods/*/test/fixtures
 codemods/*/test/tmp
-packages/babel-preset-env/data
+packages/babel-preset-env/data/[^(plugin-features|shipped-proposals).js]
 packages/babel-preset-env/test/debug-fixtures
 packages/babel-preset-env-standalone/babel-preset-env.js
 packages/babel-preset-env-standalone/babel-preset-env.min.js
 packages/babel-standalone/babel.js
 packages/babel-standalone/babel.min.js
-packages/babylon/test/expressions
+packages/babel-parser/test/expressions
+
+eslint/*/lib
+eslint/*/node_modules
+eslint/*/test
+eslint/*/tests

.eslintrc.js

@@ -0,0 +1,48 @@
+module.exports = {
+  root: true,
+  plugins: ["prettier", "@babel/development", "import"],
+  extends: "babel",
+  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: [
+        "packages/*/src/**/*.js",
+        "codemods/*/src/**/*.js",
+        "eslint/*/src/**/*.js",
+      ],
+      rules: {
+        "@babel/development/no-undefined-identifier": "error",
+        "@babel/development/no-deprecated-clone": "error",
+        "import/no-extraneous-dependencies": "error",
+        "guard-for-in": "error",
+      },
+    },
+    {
+      files: [
+        "packages/*/test/**/*.js",
+        "codemods/*/test/**/*.js",
+        "eslint/*/test/**/*.js",
+        "packages/babel-helper-transform-fixture-test-runner/src/helpers.js",
+        "test/**/*.js",
+      ],
+      env: {
+        jest: true,
+      },
+    },
+    {
+      files: ["packages/babel-plugin-*/src/index.js"],
+      excludedFiles: ["packages/babel-plugin-transform-regenerator/**/*.js"],
+      rules: {
+        "@babel/development/plugin-name": "error",
+        eqeqeq: ["error", "always", { null: "ignore" }],
+      },
+    },
+  ],
+};

.eslintrc.json

@@ -1,33 +0,0 @@
-{
-  "root": true,
-  "extends": "babel",
-  "plugins": ["prettier"],
-  "rules": {
-    "curly": ["error", "multi-line"],
-    "prettier/prettier": "error",
-    "no-case-declarations": "error"
-  },
-  "env": {
-    "node": true
-  },
-  "overrides": [
-    {
-      "files": ["packages/*/src/**/*.js", "codemods/*/src/**/*.js"],
-      "rules": {
-        "no-undefined-identifier": "error",
-        "no-deprecated-clone": "error"
-      }
-    },
-    {
-      "files": [
-        "packages/*/test/**/*.js",
-        "codemods/*/test/**/*.js",
-        "packages/babel-helper-transform-fixture-test-runner/src/helpers.js",
-        "test/**/*.js"
-      ],
-      "env": {
-        "jest": true
-      }
-    }
-  ]
-}

.flowconfig

@@ -1,10 +1,10 @@
 [ignore]
-.*/build/.*
-.*/packages/.*/lib
-.*/packages/.*/test
-.*/codemods/.*/lib
-.*/codemods/.*/test
-.*/node_modules/conventional-changelog-core/
+<PROJECT_ROOT>/build/.*
+<PROJECT_ROOT>/packages/.*/lib
+<PROJECT_ROOT>/packages/.*/test
+<PROJECT_ROOT>/codemods/.*/lib
+<PROJECT_ROOT>/codemods/.*/test
+<PROJECT_ROOT>/node_modules/module-deps/
 
 [include]
 packages/*/src
@@ -24,4 +24,6 @@ suppress_comment= \\(.\\|\n\\)*\\$FlowIgnore
 suppress_type=$FlowFixMe
 suppress_type=$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'

.github/CHANGELOG-6to5.md

@@ -84,7 +84,7 @@
   * More performance improvements.
   * Parsing is now ~30% faster thanks to [marijnh/acorn@7264bc0178e7e6af7cfe02e9e0c6b26ee0e6007f](https://github.com/marijnh/acorn/commit/7264bc0178e7e6af7cfe02e9e0c6b26ee0e6007f).
  * **New Feature**
-  * Optional `es6.blockScopingTDZ` is now completely functional and handles all edgecases.
+  * Optional `es6.blockScopingTDZ` is now completely functional and handles all edge cases.
   * `super` in object literals.
   * Tail call optimisation. Thanks [@RReverser](https://github.com/RReverser)!
 
@@ -122,7 +122,7 @@
   * Restructure transformers so they're only ran if the AST contains nodes that they need to worry about. Improves transpilation speed significantly.
  * **Bug Fix**
   * Fix source maps not tracking end of node locations.
- * **Spec Compliancy**
+ * **Spec Compliance**
   * Use static super references as the home object is actually done at definition time.
  * **Polish**
   * Force the `es6.destructuring` transformer to be whitelisted when the `es7.objectSpread` transformer is.
@@ -474,12 +474,12 @@
  * **Polish**
   * Rest parameters now allocate the array before populating.
  * **Internal**
-  * `for...in` loops have been changed to optimized `for` loops - better performance and no enumeration of protoype keys.
+  * `for...in` loops have been changed to optimized `for` loops - better performance and no enumeration of prototype keys.
   * Parts of the code generator have now been optimized thanks to [gaearon](https://github.com/gaearon).
 
 ## 2.12.3
 
- * **Spec Compliancy**
+ * **Spec Compliance**
   * Optional `typeof` transformer checks for `undefined` before passing it to the helper.
   * Class methods are now named.
 
@@ -551,7 +551,7 @@
   * Add `classesFastSuper` optional transformer that doesn't support parent getters and prototype changing.
   * Add `forOfFast` transformer that speeds up `for...of` on arrays but produces more code.
   * Add `--react-compat` to `bin/6to5`.
- * **Spec Compliancy**
+ * **Spec Compliance**
   * Disallow setters without a single parameter.
   * Add `configurable` and `writable` to defined properties.
   * Use define instead of assignment for class methods.
@@ -619,7 +619,7 @@
 
 ## 2.7.0
 
- * **Spec Compliancy**
+ * **Spec Compliance**
   * Disallow reassignments of imports.
  * **New Feature**
   * `reactCompat` option to enable pre-v0.12 react components.
@@ -643,7 +643,7 @@
 
  * **Bug Fix**
   * Better handling of number literal property keys.
-  * Handle `NewExpression` paren insertion edegcases better.
+  * Handle `NewExpression` paren insertion edge cases better.
  * **Internal**
   * Fix incorrect AST node `identifier("this")`.
   * Better `toIdentifier` method that handles reserved words.
@@ -662,7 +662,7 @@
  * **Polish**
   * Move `"use strict";` to inside module bodies instead of at the top of the file.
   * Better handling of dynamic imports.
- * **Spec Compliancy**
+ * **Spec Compliance**
   * Class inheritance now has a `function` or `null` type check.
   * Add `interopRequireWildcard` around wildcard imports and exports to handle non-object exports.
 
@@ -850,7 +850,7 @@
 
 ## 1.14.10
 
- * Fix let scoping unneccesary override.
+ * Fix let scoping unnecessary override.
 
 ## 1.14.6
 
@@ -973,7 +973,7 @@
 
 ## 1.12.21
 
- * Fix unneccesary let scoping replacement.
+ * Fix unnecessary let scoping replacement.
  * Add `commonInterop` module formatter. Thanks [@Naddiseo](https://github.com/Naddiseo).
  * Fix `return` outside of function body bug. Thanks [@brentburg](https://github.com/brentburg).
  * Add more flexible option types.
@@ -1020,7 +1020,7 @@
 
 ## 1.12.12
 
- * Make scope tracker more reliable to handle all edgecases.
+ * Make scope tracker more reliable to handle all edge cases.
 
 ## 1.12.11
 

.github/CHANGELOG-v4.md

@@ -0,0 +1,287 @@
+# Babel v4 Changelog
+
+## 4.7.16
+
+ * **Bug Fix**
+  * Fix constructor spreading of typed arrays.
+  * Fix break/continue/return aliasing of non-loops in block scoping transformer.
+
+## 4.7.15
+
+ * **Bug Fix**
+  * Fix constructor spreading of collections.
+
+## 4.7.14
+
+ * **Bug Fix**
+  * Fix constructor spreading of `Promise`.
+ * **Internal**
+  * Deprecate remaining playground transformers and abstract references.
+
+## 4.7.13
+
+ * **Bug Fix**
+  * Handle comments on use strict directives.
+  * Fix assignment patterns with a left side pattern.
+ * **Polish**
+  * Special case `this` when doing expression memoisation.
+
+## 4.7.12
+
+ * **Bug Fix**
+  * Deprecate `playground.methodBinding`.
+
+## 4.7.11
+
+ * **Bug Fix**
+  * Fix unicode regexes stripping their unicode flag before being passed on two `regexpu`.
+
+## 4.7.10
+
+ * **Internal**
+  * Deprecate `playground.methodBinding` and `playground.objectGetterMemoization`.
+ * **Bug Fix**
+  * Fix `inputSourceMap` option. Thanks [@Rich-Harris](https://github.com/Rich-Harris)!
+
+## 4.7.9
+
+ * **Polish**
+  * Allow `inputSourceMap` to be set to `false` to skip the source map inference.
+  * Infer computed literal property names.
+ * **Bug Fix**
+  * Fix nested labeled for-ofs.
+  * Fix block scoping `break` colliding with the parent switch case.
+ * **Internal**
+  * Upgrade `acorn-babel`.
+
+## 4.7.8
+
+ * **Bug Fix**
+  * Fix computed classes not properly setting symbols.
+
+## 4.7.7
+
+ * **Bug Fix**
+  * Fix `types` API exposure.
+
+## 4.7.6
+
+ * **Bug Fix**
+  * Fix non-Identifier/Literal computed class methods.
+ * **Polish**
+  * Add a fallback if `stack` on an error is unconfigurable.
+  * Hoist `esModule` module declarations to the top of the file to handle circular dependencies better.
+
+## 4.7.5
+
+ * **Bug Fix**
+  * Don't remap` break`s to call the iterator return.
+ * **Polish**
+  * Use a different helper for computed classes for much nicer output. Also fixes a bug in symbols being non-enumerable so they wouldn't be set on the class.
+
+## 4.7.4
+
+ * **Bug Fix**
+  * Rewrite named function expressions in optional async function transformers.
+  * Hoist directives.
+  * Remove `Number` from the list of valid `runtime` constructors.
+ * **Internal**
+  * `spec.typeofSymbol` transformer has been renamed to `es6.symbols`.
+
+## 4.7.2
+
+ * **New Feature**
+  * `"both"` option for `sourceMap`.
+  * Add output types to external helpers. Thanks [@neVERberleRfellerER](https://github.com/neVERberleRfellerER)!
+ * **Bug Fix**
+  * Fix node duplication sometimes resulting in a recursion error.
+  * Ignore `break`s within cases inside `for...of`.
+ * **Polish**
+  * Split up variable declarations and export declarations to allow easier transformation.
+
+## 4.7.0
+
+ * **Bug Fix**
+  * Add `alternate` to list of `STATEMENT_OR_BLOCK` keys.
+  * Add support for module specifiers to `t.isReferenced`.
+ * **New Feature**
+  * Add `inputSourceMap` option.
+ * **Polish**
+  * Throw an error on different `babel` and `babel-runtime` versions.
+  * Replicate module environment for `babel-node` eval.
+  * Clean up classes output.
+ * **Spec Compliance**
+  * Make it illegal to use a rest parameter on a setter.
+
+## 4.6.6
+
+ * **Bug Fix**
+  * Fix incorrect method call in `utility.deadCodeElimination` transformer.
+  * Fix `es6.blockScopingTDZ` transformer duplicating binding nodes.
+
+## 4.6.5
+
+ * **Internal**
+  * `useStrict` transformer has been renamed to `strict`.
+
+## 4.6.4
+
+ * **Bug Fix**
+  * Fix `ForOfStatement` not properly inheriting labels.
+  * When in closure mode in block scoping transformer, properly check for variable shadowing.
+ * **New Feature**
+  * New `utility.inlineEnvironmentVariables` and `utility.inlineExpression` transformers.
+
+## 4.6.3
+
+ * **Bug Fix**
+  * Fix `arguments` being incorrectly aliased in arrow function rest parameter optimisation.
+  * Make deoptimisation trigger safer.
+ * **New Feature**
+  * Flow types are now retained when blacklisting the `flow` transformer.
+
+## 4.6.1
+
+ * **Bug Fix**
+  * Fix generators in template directory being transformed.
+  * Fix exposure of `util` for plugins.
+
+## 4.6.0
+
+ * **New Feature**
+  * Desugar sticky regexes to a new constructor expression so it can be handled by a polyfill.
+ * **Spec Compliance**
+  * `for...of` now outputs in a lengthy `try...catch` this is to ensure spec compliance in regards to iterator returns and abrupt completions. See [google/traceur-compiler#1773](https://github.com/google/traceur-compiler/issues/1773) and [babel/babel/#838](https://github.com/babel/babel/issues/838) for more information.
+ * **Polish**
+  * Rest parameters that are only referred to via number properties on member expressions are desugared into a direct `arguments` reference. Thanks [@neVERberleRfellerER](https://github.com/neVERberleRfellerER)!
+  * `$ babel` no longer exits on syntax errors.
+ * **Internal**
+  * Upgrade `browserify`.
+  * Upgrade `source-map`.
+  * Publicly expose more internals.
+
+## 4.5.5
+
+ * **Polish**
+  * Delete old extensions when overriding them in `babel/register`.
+
+## 4.5.3
+
+ * **Bug Fix**
+  * Fix whitelisting logic for helper build script.
+
+## 4.5.2
+
+ * **New Feature**
+  * `returnUsedHelpers` option and add whitelist to `buildHelpers`.
+ * **Bug Fix**
+  * Fix function arity on self referencing inferred named functions.
+ * **Internal**
+  * Bump `acorn-babel`.
+  * Start converting source to ES6...
+
+## 4.5.1
+
+**Babel now compiles itself!**
+
+![holy shit](http://gifsec.com/wp-content/uploads/GIF/2014/03/OMG-GIF_2.gif)
+
+## 4.5.0
+
+ * **New Feature**
+  * Add `.babelrc` support.
+ * **Bug Fix**
+  * Move use strict directives to the module formatter bodies.
+ * **Internal**
+  * Make default `bin/babel` behaviour to ignore non-compilable files and add a `--copy-files` flag to revert to the old behaviour.
+
+## 4.4.6
+
+ * **Bug Fix**
+  * Fix extending a class expression with no methods/only constructor. Thanks [@neVERberleRfellerER](https://github.com/neVERberleRfellerER)!
+  * Allow `MemberExpression` as a valid `left` of `ForOfStatement`.
+ * **Polish**
+  * Throw an error when people try and transpile code with the `@jsx React.DOM` pragma as it conflicts with the custom jsx constructo method detection.
+  * Crawl all comments for `@jsx` pragma.
+ * **Internal**
+  * Upgrade `chalk`.
+  * Upgrade `core-js`.
+
+## 4.4.5
+
+ * **Internal**
+  * Remove function self reference optimisation.
+
+## 4.4.4
+
+ * **Bug Fix**
+  * Handle inferred function ids to be reassigned and deopt to a slower but working equivalent.
+  * Don't unpack array patterns that have more elements than their right hand array expression.
+ * **Polish**
+  * Improve syntax highlighting in the code frame. Thanks [@lydell](https://github.com/lydell)!
+ * **Internal**
+  * Upgrade `acorn-babel`.
+
+## 4.4.3
+
+ * **Bug Fix**
+  * Fix `for...of` iterator break returns being duplicated.
+  * Only call `return` on the iterator if it exists.
+ * **Internal**
+  * Rename `selfContained` transformer to `runtime`.
+
+## 4.4.2
+
+ * **New Feature**
+  * Add `moduleId` option for specifying a custom module id.
+
+## 4.4.0
+
+ * **New Feature**
+  * `/*** @jsx NAMESPACE **/` comments are now honored by the `react` transformer.
+  * `getModuleName` option.
+  * Infer function expression names. Thanks [@RReverser](https://github.com/RReverser)!
+ * **Bug Fix**
+  * Add proper control flow for tail recursion optimisation.
+ * **Internal**
+  * Remove useless `format` options and move the `format.compact` option to `format`.
+ * **Polish**
+  * Newline handling of the code generator has been heavily improved.
+  * Code generator now deopts whitespace if the input size is >100KB.
+
+## 4.3.0
+
+ * **Breaking Change**
+  * Remove `commonStandard` module formatter and make it the default behaviour of all the strict module formatters.
+
+## 4.2.1
+
+ * **Polish**
+  * Add auxiliary comment to let scoping closure flow control.
+
+## 4.2.0
+
+ * **Polish**
+  * Use an assignment instead of a define for `__esModule` in loose mode.
+ * **Internal**
+  * Add error for `eval();` usage and enable strict mode for parsing.
+
+## 4.1.0
+
+ * **New Feature**
+  * Add `BABEL_CACHE_PATH` and `BABEL_DISABLE_CACHE` environment variables.
+ * **Internal**
+  * Replace many internal util functions with modules. Thanks [@sindresorhus](https://github.com/sindresorhus)!
+
+## 4.0.2
+
+ * **Bug Fix**
+  * Fix generators not properly propagating their internal declarations.
+ * **Polish**
+  * Update setter param length error message.
+  * Use ranges on dependencies.
+
+## 4.0.0
+
+ * 6to5 is now known as Babel.
+ * Global helpers/runtime has now been given the more descriptive name of "external helpers".

.github/CHANGELOG-v5.md

@@ -0,0 +1,838 @@
+# Babel v5 Changelog
+
+## 5.8.26
+
+ * **Internal**
+  * Republish to get fix for runtime `typeof-react-element` helper.
+
+## 5.8.25
+
+ * **Internal**
+  * Rename `define` method to avoid webpack assuming those files are AMD.
+
+## 5.8.24
+
+ * **Spec Compliance**
+  * Updated `optimisation.react.inlineElements` transformer to React 0.14 output. Thanks [@spicyj](https://github.com/spicyj)!
+ * **Polish**
+  * Add support for evaluating more static nodes. Thanks [@hzoo](https://github.com/hzoo)!
+
+## 5.8.23
+
+ * **Bug Fix**
+  * Fix a bug where pushed scope bindings weren't properly being registered.
+
+## 5.8.22
+
+ * **Bug Fix**
+  * Fix bug causing regexes to cause a syntax error after a block.
+ * **Internal**
+  * Expose `File`.
+
+## 5.8.21
+
+ * **New Feature**
+  * Add support for Flow export types.
+ * **Bug Fix**
+  * Fix flow type annotations on object properties being lost.
+  * Fix bug effecting nested arrow functions.
+  * Check valid `export default` `function`/`class` token when parsing export default before converting to a declaration to avoid turning expressions into declarations.
+ * **Polish**
+  * Add an exception to non-existent bindings when checking if we need to wrap block scoping blocks in a closure.
+  * Make comment retainment for multiple replacement nodes more predictable.
+ * **Internal**
+  * Remove `operator` property from `AssignmentPattern` nodes.
+  * Update `es7.asyncFunctions` and `es7.objectRestSpread` to stage 2.
+
+## 5.8.13-5.8.20
+
+**The CHANGELOG was broken for these releases. Git tags were not pushed in the correct order and are therefore incorrect. It's recommended you NOT use any versions within this range.**
+
+ * **New Feature**
+  * Add `es6.spec.modules` transformer.
+ * **Bug Fix**
+  * Don't register export declarations as a module binding.
+  * Register import bindings to the specifier instead of the declaration.
+  * `export *` should not export `default`.
+  * Clear `rawValue from JSX attribute values to avoid outputting the raw source verbatim.
+  * Add support for boolean flow literals.
+  * Fix bug where files that babel can compile weren't being written when ignored with the `--copy-files` flag.
+  * Create new raw identifiers instead of cloning the original user one when exploding export specifiers to fix source map issues resulting in incorrect locations.
+  * Break on hitting a terminator paren triggering character to avoid pushing multiple starting parens.
+  * Consider comment starting character to be a terminatorless separator to avoid starting comments breaking terminatorless nodes.
+ * **Internal**
+  * Use `json5` for parsing `.babelrc` files and `JSON` for `package.json`.
+  * Update Regenerator dependency to `0.8.35`.
+  * Remove flow types from being scope tracked.
+ * **Polish**
+  * Only register export declarations in scope tracking if they're of a valid type.
+  * Only output code frame and message on syntax errors in CLI.
+  * Set decorated initialisers that have no `initialiser` to `undefined`.
+  * Optimise common `typeof` cases in `es6.spec.symbols` transformer.
+
+## 5.8.12
+
+ * **Bug Fix**
+  * Fix bug in lookahead causing decorators to be cleared.
+
+## 5.8.11
+
+ * **Bug Fix**
+  * Check if module options are nully instead of falsy to allow empty strings as `moduleRoot` etc.
+  * Fix bug where reassigning the rest parameter wouldn't result in a deoptimisation.
+
+## 5.8.9
+
+ * **Bug Fix**
+  * Fix issue in parser where the flow plugin wasn't using state to refer to whether it as in a type or not causing lookaheads to cause breakages.
+
+## 5.8.8
+
+ * **Bug Fix**
+  * Fix comments not being attached if they're touching the start of their node.
+
+## 5.8.7
+
+ * Never published, environment issues, again.
+
+## 5.8.6
+
+ * **Bug Fix**
+  * Remove `rawValue` for JSX inner text.
+
+## 5.8.5
+
+ * **Polish**
+  * Rewrite parentheses insertion for terminatorless nodes such as `BreakStatement` to be much more stable and cleaner.
+  * Use `Object.setPrototypeOf` and fallback to `__proto__` in `inherits` helper.
+
+## 5.8.2-5.8.4
+
+Issues with publish process.
+
+## 5.8.1
+
+ * **Bug Fix**
+  * Fix regression where async arrow functions couldn't have type annotation parameters.
+  * Output type annotations of type instantiation parameters.
+ * **Polish**
+  * Prepend to highest loop when performing rest parameter allocation optimisation.
+  * Add comment attachment to parser.
+  * Add support for retaining inner comments of empty blocks.
+
+## 5.8.0
+
+ * Never released due to publish environment issues.
+
+## 5.7.4
+
+ * **Bug Fix**
+  * Fix comments containg `@flow` being completely removed from output rather than just the specific directive.
+
+## 5.7.3
+
+ * **Bug Fix**
+  * Add shim file for broken file path that old versions of the CLI would attempt to use.
+
+## 5.7.2
+
+ * **Bug Fix**
+  * Fix performance issue in code generator when comment columns would attempt to match up in `compact` mode causing large amounts of whitespace.
+  * Fix single line comments not outputting a newline in `compact` mode.
+ * **Polish**
+  * Add support for flow return types for arrow functions.
+
+## 5.7.1
+
+ * **Bug Fix**
+  * Add back mistakenly removed `replaceWithSourceString` method.
+
+## 5.7.0
+
+ * **Bug Fix**
+  * Deopt on spread elements when performing array destructuring unpack optimisation.
+ * **New Feature**
+  * Add `shouldPrintComment` option to control comment output.
+  * Add `.babelignore` file to be consistent with other tools.
+  * Allow `.babelrc` configs to be specified via `package.json`.
+ * **Polish**
+  * Don't ignore comments when using `compact: true` option.
+  * Add support for Flow `import typeof`.
+  * Fix incorrect inheritance method position when using loose mode classes and constructor isn't the first item.
+ * **Internal**
+  * Completely fork Acorn with `babylon`.
+  * Rewrite build system to accommodate for multiple packages.
+
+## 5.6.17
+
+ * **Bug Fix**
+  * Fix `CodeGenerator.findCommonStringDelimiter` causing a stack overflow.
+
+## 5.6.16
+
+ * **Internal**
+  * Fix `recast` version to avoid pulling in a newer version.
+ * **New Feature**
+  * Add support for functions in `util.shouldIgnore`.
+ * **Polish**
+  * Strip flow directives in flow transformer.
+  * Add a check for out of bounds default parameters, drastically improving performance and removes engine deoptimisations.
+  * Various performance optimisations by [@samccone](https://github.com/samccone) 💅✨
+  * Delay `this` assignment when referencing this inside an arrow function pre-bare super in derived class constructors.
+  * Split up class body pushing if the constructor is in the wrong order.
+ * **Bug Fix**
+  * Fix hoisting of `ForInStatement` `init` variables in `system` module formatter.
+  * `PathHoister`: Don't hoist to the same function as their original paths function parent.
+  * `PathHoister`: Push each violation paths ancestry to the breakOnScopePaths collection to avoid constant hoisting to nested paths.fix tail call recursion on functions with less arguments than parameters.
+  * Disallow `super.*` before `super()` in derived class constructors.
+  * Properly regenerate scope for replaced nodes. Thanks [@loganfsmyth](https://github.com/loganfsmyth)!
+  * Move up template literal simplification logic to avoid breaking on single elements.
+
+## 5.6.13-5.6.15
+
+ * Setting up automatic Travis releases.
+
+## 5.6.12
+
+ * **Bug Fix**
+  * Fix finding parent for top-level shadowed functions.
+
+## 5.6.11
+
+ ** **Internal**
+  * Merge `es6.parameters.rest` and `es6.parameters.default` transformers. See commit [c0fd4c1f9e0b18231f585c4fa793e4cb0e01aed1](https://github.com/babel/babel/commit/c0fd4c1f9e0b18231f585c4fa793e4cb0e01aed1) for more info.
+
+## 5.6.10
+
+ * **Bug Fix**
+  * Fix faulty internal require check.
+ * **Polish**
+  * Add support for trailing commas in arrow function parameter lists.
+
+## 5.6.8
+
+ * **Bug Fix**
+  * Fix binary expressions colliding with unary expression operators in compact mode.
+  * Fix node properties being set to `null` when using computed properties.
+
+## 5.6.7
+
+ * **Bug Fix**
+  * Fix hoisting of `ForXStatement` `left` `var`s when inserting a block scoping IIFE.
+ * **Polish**
+  * Combine all leading computed property initialisers into the root object in loose mode.
+ * **Internal**
+  * Deprecate returning of replacement strings from visitor methods.
+
+## 5.6.6
+
+ * **Bug Fix**
+  * Fix weird parser bug where `void` type annotations were being parsed as keywords causing the tokeniser to lose track of context.
+
+## 5.6.5
+
+ * **Bug Fix**
+  * Fix nested functions causing rest parameter optimisation to not properly detect when it should deopt on a reference.
+ * **Internal**
+  * Update Regenerator `0.8.31`.
+
+## 5.6.4
+
+ * **Internal**
+  * Add `ParenthesizedExpression` node type.
+
+## 5.6.3
+
+ * **Bug Fix**
+  * Fix rest parameter array allocation loop being incorrectly aliased.
+
+## 5.6.2
+
+ * **Bug Fix**
+  * Fix method key literals not turning into computed member expression in loose mode.
+  * Elect rest parameters in spread element position as candidates instead of replacing them in place.
+
+## 5.6.0
+
+ * **Bug Fix**
+  * Fix istanbul interop for register hook when registering for non-existence extension.
+  * Fix super class constructor call differing for no constructor in derived classes.
+  * Disable module import receiver when in loose mode.
+  * Fix duplicate filenames when using `babel` CLI when passing multiple matching patterns.
+  * Register labels as bindings to fix undeclared variable checks.
+ * **Polish**
+  * Remove unnecessary string binary expressions when transforming template literals.
+  * Support module live bindings in arbitrary positions not in Program statement position.
+  * Throw error when attempting to replace a `Program` root node with another node not of type `Program`.
+  * Optimise rest parameters in spread element position and allocate rest array at the earliest common ancestor of all references.
+  * Generate original number representation when value was not changed.
+  * Check for invalid binding identifiers when generating inferred method names.
+  * Don't terminate CLI when watching files fail compilation on init.
+ * **New Feature**
+  * Add new plugin API.
+ * **Internal**
+  * Split react displayName addition into a plugin.
+  * Add check for `JSXMemberExpression` to `t.isReferenced`.
+  * Move `validation.undeclaredVariableCheck` transformer up.
+  * Start great core-to-plugin exodus.
+  * Add `BindingIdentifier` virtual type.
+  * Hidden class optimisations.
+  * Array allocation optimisations.
+  * Update `regenerator`.
+  * Update `js-tokens`.
+  * Sync with upstream Acorn.
+
+## 5.5.8
+
+ * **Internal**
+  * Remove extremely unprofessional and harsh error message for those hotlinking to `resolve-rc`.
+
+## 5.5.7
+
+ * **Bug Fix**
+  * Push newline after decorators when doing code gen.
+  * Rewriting error handling to normalise options before merging them.
+  * Remove duplicate keys in `alias-keys.json` causing errors in strict mode.
+  * Fix `$ babel --help` not showing optional transformers as such.
+ * **New Feature**
+  * Add `auxiliaryCommentBefore` and `auxiliaryCommentAfter` options.
+
+## 5.5.6
+
+ * **Bug Fix**
+  * Fix `let` binding collision in loop head not properly replacing `AssignmentExpression`s.
+
+## 5.5.5
+
+ * **Bug Fix**
+  * Fix `file.opts` not being set before `file.log.deprecate` was called causing a `ReferenceError` as it was checking for a property on it.
+
+## 5.5.4
+
+ * **Bug Fix**
+  * Add back missing `shouldIgnore` check.
+  * Log message on deprecated options rather than throw an error.
+  * Fix name of `auxiliaryComment` option when attempting Istanbul interop in `babel/register`.
+
+## 5.5.3
+
+ * **Bug Fix**
+  * Fix weird state bug when traversing overa  `node` `ClassProperty` instead of `path` in the `es6.classes` transformer.
+
+## 5.5.2
+
+ * **Bug Fix**
+  * Fix `NodePath#isPure` on `Property` nodes.
+  * Use cwd instead of entry file directory when working out relative directory for `babel/register`.
+ * **Internal**
+  * Add scary warning for those few who choose to use the WIP experimental transformers.
+
+## 5.5.1
+
+ * **Bug Fix**
+  * Remove `ClassProperty` nodes always in the `Flow` transformer. This is fine now since class properties aren't supported in any engine that supports classes but the `es7.classProperties` transformer will need to be updated in the future to desugar to ES6 classes instead of relying on the `es6.classes` transformer from being ran.
+
+## 5.5.0
+
+ * **Bug Fix**
+  * Allow pushing declarations to `SwitchStatement`s.
+  * Fix `minification.removeDebugger` to remove `DebuggerStatement`s rather than `ExpressionStatement`s with an identifier of `debugger`.
+  * Check LHS in `ForInStatement` and `ForOfStatement` for constant violations.
+  * Register function `id` as a reference when naming methods to avoid collisions.
+  * Support key literals when checking for the existence of `displayName` property when attempting to add it for `React.createClass`.
+  * Remove `ExportDefaultSpecifier` check from `t.isDefaultSpecifier`.
+  * Don't consider `JSXIdentifier` HTML tag identifiers to be references.
+ * **Polish**
+  * Update `minification.deadCodeElimination` transformer to remove all statements after completion statements.
+  * Update `minification.deadCodeElimination` transformer to not inline single used bindings that exist in different scopes.
+  * When performing Istanbul interop in `babel/register`, add the auxiliary comment `"istanbul ignore text"` to get more accurate coverage.
+  * Add `--nolazy` argument to `babel-node`.
+  * Add support for `cluster` forking.
+  * Perform scope tracking in a single pass instead of multiple.
+  * Smarten up type inferrence and resolution to support the whole array of language constructs.
+  * Optimise module metadata retrieval into a single pass.
+  * Ignore trailing commas when inferring newlines.
+  * Rename `minification.inlineExpressions` transformer to `minification.constantFolding`.
+  * Check path relative to entry file when checking to see if we're inside `node_modules` when using `babel/register`.
+  * Upgrade `regenerator`.
+
+## 5.4.7
+
+ * **Bug Fix**
+  * Don't consider `JSXAttribute` `names` to be valid `ReferencedIdentifier`s.
+
+## 5.4.6
+
+ * **Bug Fix**
+  * Fix `spec.functionName` transformer incorrectly attempting to rename a binding that doesn't exist as it's a global.
+ * **Internal**
+  * Deprecate custom module formatters.
+
+## 5.4.5
+
+ * **Bug Fix**
+  * Add `JSXIdentifier` as a valid `ReferencedIdentifier` visitor virtual type.
+  * Ignore `CallExpression` `_prettyCall` when the `retainLines` option is enabled.
+  * Inherit comments to new declaration node when exploding module declarations.
+  * Fix `es6.tailCall` transformer failing on calls that exceed the max parameters of the function.
+
+## 5.4.4
+
+ * **Bug Fix**
+  * Fix bug where replacing variable declarations in the head of a `for` loop would turn them into `ExpressionStatement`s.
+  * Fix renaming of assignment expressions that were non-identifiers ie. patterns.
+  * Force space before `class` `id` to avoid breaking named classes when using `compact` mode.
+  * Add assignment pattern explosion to avoid initial duplicate nodes.
+  * Ignore this and arguments when performing TCO on shadowed functions.
+ * **Polish**
+  * Rename `sourceMapName` option to `sourceMapTarget`. Thanks [@getify](https://github.com/getify)!
+  * Better detection of completion records, ignore those in `Function`s.
+  * Clarified descriptions of the options that are enabled by default.
+  * Resolve `\`babel-plugin-${name}\`` plugin names **before** just checking the `name`. Thanks [@jquense](https://github.com/jquense)!
+  * Update AMD module formatter to add import default remapping.
+
+## 5.4.3
+
+ * **Bug Fix**
+  * Fix `module` being incorrectly rewritten when used as in an export declaration.
+  * When performing single-reference inlining, ensure that the single reference isn't a child of the binding itself.
+  * Fix a bug in `minification.deadCodeElimination` where a new binding instance was being created for local class bindings instead of just inheriting the parent one.
+  * Fix bug with paren printing in `compact` and `retainLines` mode where a left paren was already printed before catching up.
+ * **Internal**
+  * Handle contexts for paths much better. This will ensure that the path node location info is in sync.
+
+## 5.4.2
+
+ * **Polish**
+  * `ignore` and `only` patterns are now **very** liberal. The pattern can now exist anywhere in the path.
+
+## 5.4.1
+
+ * **Bug Fix**
+  * Add missing `slash` dependency. Thanks [@browncolyn](https://github.com/browncolyn)!
+ * **Polish**
+  * Clean up `shouldIgnore` algorithm to work how you'd expect rather than being a hacky piece of shit. It now crawls the entire path, checking each section of it against the input ignore/only patterns. This means that the pattern `foo` will ignore the paths `foo/bar.js`, `bar/foo` etc.
+
+## 5.4.0
+
+ * **New Feature**
+  * Added [function bind syntax](https://github.com/zenparsing/es-function-bind) behind stage 0. Thanks [@RReverser](https://github.com/rreverser)!
+  * Added `env` option. Especially handy when using the `.babelrc`.
+ * **Bug Fix**
+  * Fix files not properly being ignored when `babel.transform` ignores them when using `$ babel`.
+  * Fix scope tracking registering loop head bindings to their `VariableDeclaration` instead of `VariableDeclarator`.
+ * **Polish**
+  * Normalise path separators for souce map paths when using `$ babel`.
+  * Rework `PathHoister` to ignore global references and to not deopt on reassignments to referenced bindings, instead it tries to hoist to the highest scope.
+  * Added missing exponential operator inlining. Thanks [@nkt](https://github.com/nkt)!
+  * Optimise `regenerator` transformer. Thanks [@benjamn](https://github.com/benjamn)!
+
+## 5.3.3
+
+ * **Bug Fix**
+  * Fix `minification.deadCodeElimination` transformer incorrectly trying to inline import declarations.
+  * Fix `minification.inlineExpression` transformer getting into an infinite loop.
+
+## 5.3.2
+
+ * **Bug Fix**
+  * Fix patterns not being considered when hoisting variables in the `es6.blockScoping` transformer.
+
+## 5.3.1
+
+ * **Bug Fix**
+  * Fix unique export specifiers not being cloned when exploding class and function exports,
+ * **Polish**
+  * Turn import remaps to sequence expressions to remove their context and improve performance.
+
+## 5.3.0
+
+**Speeeeeeed**
+
+![gifs lol](https://31.media.tumblr.com/568205a0e37ae15eca510fa639589a59/tumblr_n8kw8kpcSb1sg6cg8o1_500.gif)
+
+ * **Spec Compliance**
+  * Allow trailing param commas for methods when using the `es7.trailingCommas` transformer.
+ * **Bug Fix**
+  * Fix `es6.blockScoping` transformer not properly ignoring `break` in `SwitchCase`.
+  * Fix lookahead context saving to avoid weird tokenizer state.
+  * Explode duplicate identifiers in export/import specifiers and property shorthand to create unique objects.
+  * Skip loose mode for class methods when they have decorators.
+  * When removing nodes, share their comments with their siblings.
+  * Properly hoist temp param declarations when doing TCO.
+ * **Internal**
+  * Add `--harmony_generators` flag to `$ babel-node`.
+  * Internal AST traversals have been minimised **drastically**. Transformers have been grouped together which means entire tree traversals are much fewer. Visiting nodes is now also skipped if the traversal context can detect that the handler is a noop. This sames precious cycles as it avoids constructing traversal paths and creating a new traversal context. See issues [#1472](https://github.com/babel/babel/issues/1472) and [#1486](https://github.com/babel/babel/issues/1486) for related discussion.
+ * **Polish**
+  * Move many `utility` transformers to `minification`.
+
+## 5.2.17
+
+ * **Bug Fix**
+  * Fix auxiliary comments not properly being attached to function declaration helpers.
+  * Add `Super` node type to `ast-types` patch.
+  * Ignore parameter bindings when attempting to inline them in the `minification.deadCodeElimination` transformer.
+  * Correct `extensions` arguments when using the Babel CLI.
+
+## 5.2.16
+
+ * **Bug Fix**
+  * Fix plugins being disabled when using the whitelist.
+  * Fix correct function scope being passed to `nameMethod.property` when inferring the function name for class methods.
+  * Fix incorrect extensions reference causing weird issues when using the Babel CLI.
+  * Fix destructuring param reference replacements not inheriting from their original param.
+ * **Spec Compliance**
+  * Fix order that method decorators are ran in.
+
+## 5.2.15
+
+ * **Bug Fix**
+  * Fix initializer descriptor add attempt if it doesn't exist.
+
+## 5.2.14
+
+ * **Bug Fix**
+  * Fix bug with initializer decorators where the descriptors weren't being defined if there was no `initializer` property.
+ * **Internal**
+  * Expose `retainLines` option to CLI.
+  * Fix `retainLines` option not being taken into consideration when doing multiple variable declaration declarators generation.
+  * Expose minified and unminified copies of dist scripts.
+
+## 5.2.13
+
+ * **Bug Fix**
+  * Fix `ExportDeclaration`s being incorrectly removed when using the `utility.deadCodeElimination` transformer.
+  * Fix position of `utility` transformers.
+ * **New Feature**
+  * Add built-in `esquery` support.
+ * **Internal**
+  * Consolidate notion of "virtual types".
+
+## 5.2.12
+
+ * **Polish**
+  * Make UID generation based on module declarations **much** nicer.
+ * **Internal**
+  * Remove internal check for traversal path replacement of self. This is a pattern that **could** come up in the wild and it could lead to pretty nasty code and may lead to internal regressions as the test coverage isn't 100% :( Instead, just put it in the fast path.
+
+## 5.2.11
+
+ * **Internal**
+  * Rename `getModuleName` option to `getModuleId`, doh.
+
+## 5.2.10
+
+ * **Bug Fix**
+  * Fix numerous issues in `replaceWithSourceString`. Thanks [@pangratz](https://github.com/pangratz)!
+ * **New Feature**
+  * Add `getModuleName` option. Thanks [@jayphelps](https://github.com/jayphelps)!
+
+## 5.2.9
+
+ * **Bug Fix**
+  * Fix `_blockHoist` transformer incorrectly sorting nodes on shitty environments that aren't spec compliant in their key order.
+  * Fix broken `parse` API method reference to an undeclared import.
+
+## 5.2.7
+
+ * **Bug Fix**
+  * Move `utility.deadCodeElimination` transformer up to avoid race conditions.
+  * Fix shorthand property scope binding renaming.
+ * **Polish**
+  * Turn helper variable declarations into function declarations if possible.
+ * **Internal**
+  * Removed native inheritance support from classes.
+  * Added `replaceWithSourceString` path API.
+  * Split up `es3.propertyLiterals` and `es3.memberExpressionLiterals` transformers to `minification.propertyLiterals` and `es3.memberExpressionLiterals`.
+
+## 5.2.6
+
+ * **Internal**
+  * Fix transformer aliases being accidentally set as deprecated ones.
+  * Expose `Pipeline` as `TransformerPipeline` instead.
+
+## 5.2.5
+
+ * **Bug Fix**
+  * Fix `parse` API not adding all the correct pipeline transformers.
+
+## 5.2.4
+
+ * **Bug Fix**
+  * Fix race condition with the Node API being loaded awkwardly and not being able to initialise itself when used in the browser.
+ * **Internal**
+  * Expose `transform.pipeline`.
+
+## 5.2.3
+
+ * **Bug Fix**
+  * Fix plugin containers being called with an undefined import. Thanks [@timbur](https://github.com/timbur)!
+  * Allow Flow object separators to be commas. Thanks [@monsanto](https://github.com/monsanto)!
+  * Add missing `Statement` and `Declaration` node aliases to flow types.
+
+## 5.2.2
+
+ * **Internal**
+  * Allow `util.arrayify` to take arbitrary types and coerce it into an array.
+
+## 5.2.1
+
+ * **Bug Fix**
+  * Fix regression in `node/register` that caused `node_modules` to not be ignored.
+
+## 5.2.0
+
+ * **Bug Fix**
+  * Fix plugin strings splitting arbitrarily on `:` which caused full paths on Windows to fail as they include `:` after the drive letter.
+  * Call class property `initializer`s with their target instead of their descriptor.
+  * Fix `ignore` and `only` not properly working on Windows path separators. Thanks [@stagas](https://github.com/stagas)!
+  * Fix `resolveRc` running on files twice causing issues. Thanks [@lukescott](https://github.com/lukescott)!
+  * Fix shorthand properties not correctly being target for `isReferenced` checks. Thanks [@monsanto](https://github.com/monsanto)!
+ * **Polish**
+  * Allow passing an array of globs to `babel/register` `only` and `ignore` options. Thanks [@Mark-Simulacrum](https://github.com/Mark-Simulacrum)!
+  * When inferring function names that collide with upper bindings, instead of doing the wrapper, instead rename them.
+  * Consider constant-like variable declaration functions to always refer to themselves so TOC can be performed.
+  * Process globs manually when using `$ babel` as some shells such as Windows don't explode them. Thanks [@jden](https://github.com/jden)!
+  * Add alternative way to execute plugins via a closure that's called with the current Babel instance.
+ * **Internal**
+  * Remove multiple internal transformers in favor of directly doing things when we need to. Previously, declarations such as `_ref` that we needed to create in specific scopes were done at the very end via the `_declarations` transformer. Now, they're done and added to the scope **right** when they're needed. This gets rid of the crappy `_declarations` property on scope nodes and fixes the crappy regenerator bug where it was creating a new `BlockStatement` so the declarations were being lost.
+  * Rework transformer traversal optimisation. Turns out that calling a `check` function for **every single node** in the AST is ridiculously expensive. 300,000 nodes timesed by ~30 transformers meant that it took tens of seconds to perform while it's quicker to just do the unnecessary traversal. Seems obvious in hindsight.
+ * **New Feature**
+  * Add `jscript` transformer that turns named function expressions into function declarations to get around [JScript's horribly broken function expression semantics](https://kangax.github.io/nfe/#jscript-bugs). Thanks [@kondi](https://github.com/kondi)!
+  * Add `@@hasInstance` support to objects when using the `es6.spec.symbols` transformer.
+  * Add `retainLines` option that retains the line (but not the columns!) of the input code.
+
+## 5.1.13
+
+ * **Polish**
+  * Remove symbol check from `defineProperty` helper.
+
+## 5.1.12
+
+ * **Bug Fix**
+  * Fix `resolveModuleSource` not being ran on `ExportAllDeclaration`s.
+  * Fix `.babelrc` being resolved multiple times when using the require hook.
+  * Fix parse error on spread properties in assignment position.
+  * Fix `externalHelpers` option being incorrectly listed as type `string`.
+ * **Internal**
+  * Upgrade `core-js` to `0.9.0`.
+ * **Spec Compliance**
+  * Fix object decorators not using the `initializer` pattern.
+  * Remove property initializer descriptor reflection.
+
+## 5.1.11
+
+ * **Bug Fix**
+  * Memoise and bind member expression decorators.
+  * Move JSX children cleaning to opening element visitor. Fixes elements not being cleaned in certain scenarios.
+  * Consider `SwitchStatement`s to be `Scopable`.
+  * Fix `bluebirdCoroutines` calling `interopRequireWildcard` before it's defined.
+  * Add space to `do...while` code generation.
+  * Validate `super` use before `this` on `super` exit rather than entrance.
+ * **Polish**
+  * Add Babel name to logger.
+
+## 5.1.10
+
+ * **Bug Fix**
+  * Remove `makePredicate` from acorn in favor of an `indexOf`.
+  * Remove statements to expression explosion when inserting a block statement.
+ * **Internal**
+  * Remove runtime compatibility check.
+
+## 5.1.9
+
+ * **Bug Fix**
+  * Fix class property initializers with `undefined` values not being correctly writable.
+  * Fix self inferring generators incorrectly causing a stack error.
+  * Fix default export specifiers not triggering AMD `module` argument inclusion.
+  * Fix assignments not having their module references properly remapped.
+ * **Internal**
+  * Upgrade to latest `acorn`.
+ * **Polish**
+  * Make invalid LHS pattern error messages nicer.
+
+## 5.1.8
+
+ * **Bug Fix**
+  * Only make parenthesized object pattern LHS illegal.
+
+## 5.1.7
+
+ * **Internal**
+  * Add `parse` node API.
+
+## 5.1.6
+
+ * **Bug Fix**
+  * Fix `runtime` built-in catchall not properly checking for local variables.
+
+## 5.1.5
+
+ * **Internal**
+  * Bump `core-js` version.
+
+## 5.1.4
+
+ * **Polish**
+  * Add missing `Reflect` methods to runtime transformer.
+
+## 5.1.3
+
+ * **Internal**
+  * Switch entirely to vanilla regenerator.
+  * Clean up and make the parsing of decorators stateless.
+ * **Bug Fix**
+  * Don't do TCO on generators and async functions.
+  * Add missing `core-js` runtime definitions.
+
+## 5.1.2
+
+ * **Bug Fix**
+  * Add `getIterator` and `isIterable` to `babel-runtime` build script.
+
+## 5.1.1
+
+ * **Bug Fix**
+  * Add missing runtime symbol definitions.
+
+## 5.1.0
+
+ * **Bug Fix**
+  * Fix super reference when using decorators.
+  * Don't do array unpack optimisation when member expressions are present.
+  * Add missing descriptors for undecorated class properties.
+  * Don't consider `arguments` and `eval` valid function names when doing function name inferrence.
+  * Fix scope tracking of constants in loop heads.
+  * Parse `AwaitExpression` as a unary instead of an assignment.
+  * Fix regex evaluation when attempting static evaluation.
+  * Don't emit tokens when doing a lookahead.
+  * Add missing `test` declaration to `utility.deadCodeElimination` transformer.
+ * **Internal**
+  * Upgrade `regenerator` to the latest and use my branch with the hope of eventually switching to vanilla regenerator.
+  * Add support for the replacement of for loop `init`s with statements.
+  * Upgrade dependencies.
+ * **Polish**
+  * When adding the scope IIFE when using default parameters, don't shadow the function expression, just `apply` `this` and `arguments` if necessary.
+  * Use path basename as non-default import fallback.
+ * **New Feature**
+  * Add [trailing function comma proposal](https://github.com/jeffmo/es-trailing-function-commas). Thanks [@AluisioASG](https://github.com/AluisioASG)!
+  * Add support for object literal decorators.
+  * Make core-js modular when using the `runtime` transformer.
+
+## 5.0.12
+
+ * **Bug Fix**
+  * Fix incorrect remapping of module references inside of a function id redirection container.
+
+## 5.0.11
+
+ * **Bug Fix**
+  * Fix new `for...of` loops not properly inheriting their original loop.
+ * **Internal**
+  * Disable scope instance cache.
+ * **Polish**
+  * Allow comments in `.babelrc` JSON.
+
+## 5.0.9
+
+ * **Polish**
+  * Use `moduleId` for UMD global name if available.
+ * **Bug Fix**
+  * Fix UMD global `module` variable shadowing the `amd`/`common` `module` variable.
+  * Fix Flow param type annotation regression.
+  * Fix function name collision `toString` wrapper. Thanks [@alawatthe](https://github.com/alawatthe)!
+
+## 5.0.8
+
+ * **Bug Fix**
+  * Fix falsy static class properties not being writable.
+  * Fix block scoping collisions not properly detecting modules and function clashes.
+  * Skip `this` before `super` for derived constructors on functions.
+
+## 5.0.7
+
+ * **New Feature**
+  * Add `--ignore` and `--only` support to the CLI.
+ * **Bug Fix**
+  * Remove `HOMEPATH` environment variable from home resolution in `babel/register` cache.
+ * **Internal**
+  * Disable WIP path resolution introducing infinite recursion in some code examples.
+ * **Polish**
+  * Add live binding to CommonJS default imports.
+
+## 5.0.6
+
+ * **Bug Fix**
+  * Fix mangling of import references that collide with properties on `Object.prototype`.
+  * Fix duplicate declarations incorrectly being reported for `var`.
+
+## 5.0.5
+
+ * **Internal**
+  * Upgrade `core-js`.
+ * **Bug Fix**
+  * Fix arrays not being supported in `util.list`.
+
+## 5.0.4
+
+ * **Polish**
+  * Check for top level `breakConfig` in `resolveRc`.
+
+## 5.0.3
+
+ * **Bug Fix**
+  * Make relative location absolute before calling `resolveRc`.
+ * **Internal**
+  * Switch to global UID registry.
+  * Add `breakConfig` option to prevent Babel from erroring when hitting that option.
+
+## 5.0.1
+
+ * **Bug Fix**
+  * Fix duplicate declaration regression.
+  * Fix not being able to call non-writable methods.
+
+## 5.0.0
+
+ * **New Feature**
+  * Decorators based on [@wycat's](https://github.com/wycats) [stage 1 proposal](https://github.com/wycats/javascript-decorators).
+  * Class property initializers based on [@jeffmo's](https://github.com/jeffmo) [stage 0 proposal](https://gist.github.com/jeffmo/054df782c05639da2adb).
+  * Export extensions based on [@leebyron's](https://github.com/leebyron) [stage 1 proposal](https://github.com/leebyron/ecmascript-more-export-from).
+  * UMD module formatter now supports globals.
+  * Add `es3.runtime`, `optimisation.react.inlineElements` and `optimisation.react.constantElements` transformers.
+  * Add stage option that replaces the experimental one.
+  * Allow ES7 transformer to be enabled via `optional` instead of only via `stage`.
+  * Infer string quotes to use in the code generator.
+  * Consider `export { foo as default  };` to be the same as `export default foo;`.
+  * Add `nonStandard` option that can be set to `false` to remove parser support for JSX and Flow.
+  * Add `jsxPragma` option.
+  * Automatically generate CLI options based on internal API options.
+  * Add support for `.babelrc` on absolute paths.
+  * Plugin API!
+ * **Internal**
+  * Export `options` in browser API.
+  * Rewritten parser.
+  * Don't block hoist when runtime transformer is enabled in system module formatter.
+  * Rewritten the internal traversal and node replacement API to use "paths" that abstracts out node relationships.
+ * **Polish**
+  * JSX output is now more inline with the official JSX transformer.
+  * Hoist block scoping IIFE - this improves memory usage and performance.
+  * Better IIFE detection - references are now checked to see if they're referencing the binding we're searching for.
+  * Check for import reassignments in constants transformer.
+  * Make method definitions with expression bodies illegal.
+  * Save register cache on tick instead of `SIGINT`.
+  * Enable strict mode on babel-node eval flag.
+ * **Bug Fixes**
+  * Add support for live bindings. This change also increases the reliability of export specifier renaming.
+  * Add support for super update and non equals assignment expressions.
+  * Rename shadow constructor binding in classes.
+  * Seed next iteration bindings with previous fresh bindings when reassigning loop block scoped variables.
+  * Fix new expression spread referencing the wrong constructor.
+  * Call `resolveModuleSource` on dynamic imports.
+  * Added `param` to list of duplicate declaration kinds.
+ * **Breaking Changes**
+  * The Babel playground has been removed.
+  * ES7 Abstract References have been removed.
+  * Experimental option has been removed in favor of a stage option.
+  * Rename `returnUsedHelpers` to `metadataUsedHelpers`.

.github/ISSUE_TEMPLATE.md

@@ -1,63 +1,6 @@
 <!---
 Thanks for filing an issue 😄 ! Before you submit, please read the following:
 
+Check the other issue templates if you are trying to submit a bug report, feature request, or question
 Search open/closed issues before submitting since someone might have asked the same thing before!
-
-If you have a support request or question please submit them to one of this resources:
-
-* Slack Community: https://slack.babeljs.io/
-* StackOverflow: http://stackoverflow.com/questions/tagged/babeljs using the tag `babeljs`
-* Also have a look at the readme for more information on how to get support:
-  https://github.com/babel/babel/blob/master/README.md
-
-Issues on GitHub are only related to problems of Babel itself and we cannot answer 
-support questions here.
 -->
-
-Choose one: is this a bug report or feature request?
-
-<!--- Provide a general summary of the issue in the title above -->
-
-### Input Code
-<!--- If you're describing a bug, please let us know which sample code reproduces your problem -->
-<!--- If you have link to our REPL or a standalone repo please link that! -->
-
-```js
-var your => (code) => here;
-```
-
-### Babel/Babylon Configuration (.babelrc, package.json, cli command)
-<!--- If describing a bug, tell us what your babel configuration looks like -->
-
-```js
-{
-  "your": { "config": "here" }
-}
-```
-
-### Expected Behavior
-<!--- If you're describing a bug, tell us what should happen -->
-<!--- If you're suggesting a change/improvement, tell us how it should work -->
-
-### Current Behavior
-<!--- If describing a bug, tell us what happens instead of the expected behavior -->
-<!--- If suggesting a change/improvement, explain the difference from current behavior -->
-
-### Possible Solution
-<!--- Not obligatory, but suggest a fix/reason for the bug, -->
-<!--- or ideas how to implement the addition or change -->
-
-### Context
-<!--- How has this issue affected you? What are you trying to accomplish? -->
-<!--- Providing context helps us come up with a solution that is most useful in the real world -->
-
-### Your Environment
-<!--- Include as many relevant details about the environment you experienced the bug in -->
-
-| software         | version(s)
-| ---------------- | -------
-| Babel            |  
-| Babylon          | <!-- This is only needed if you are using Babylon directly -->
-| node             | 
-| npm              | 
-| Operating System | 

.github/ISSUE_TEMPLATE/Bug_report.md

@@ -0,0 +1,57 @@
+---
+name: "\U0001F41B Bug Report"
+about: "If something isn't working as expected \U0001F914."
+title: ''
+labels: 'i: bug, i: needs triage'
+assignees: ''
+
+---
+
+## Bug Report
+
+<!-- Check this if you would like to implement a PR, we are more than happy to help you go through the process !-->
+- [ ] I would like to work on a fix!
+
+<!--
+@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.
+-->
+
+**Current Behavior**
+A clear and concise description of the behavior.
+
+**Input Code**
+- REPL or Repo link if applicable:
+
+```js
+var your => (code) => here;
+```
+
+**Expected behavior/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`
+
+```js
+{
+  "your": { "config": "here" }
+}
+```
+
+**Environment**
+<!--- Tip: Instead of filling out the questions below, you can run `npx envinfo --preset babel` and paste the result below ``` -->
+```
+
+```
+- Babel version(s): [e.g. v6.0.0, v7.0.0-beta.34]
+- Node/npm version: [e.g. Node 8/npm 5]
+- OS: [e.g. OSX 10.13.4, Windows 10]
+- Monorepo: [e.g. yes/no/Lerna]
+- How you are using Babel: [e.g. `cli`, `register`, `loader`]
+
+**Possible Solution**
+<!--- If you have suggestions on a fix for the bug -->
+
+**Additional context/Screenshots**
+Add any other context about the problem here. If applicable, add screenshots to help explain.

.github/ISSUE_TEMPLATE/Feature_request.md

@@ -0,0 +1,26 @@
+---
+name: "\U0001F680 Feature Request"
+about: "I have a suggestion (and may want to implement it \U0001F642)!"
+title: ''
+labels: 'i: enhancement, i: needs triage'
+assignees: ''
+
+---
+
+## Feature Request
+
+<!-- Check this if you would like to implement a PR, we are more than happy to help you go through the process !-->
+- [ ] I would like to work on this feature!
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I have an issue when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen. Add any considered drawbacks.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Teachability, Documentation, Adoption, Migration Strategy**
+If you can, explain how users will be able to use this and possibly write out a version the docs.
+Maybe a screenshot or design?

.github/ISSUE_TEMPLATE/Regression-v7.md

@@ -0,0 +1,52 @@
+---
+name: "\U0001F4A5 v7 Regression"
+about: Report an unexpected behavior in v7 from v6 (Check the upgrade guide first
+  ✌️)
+title: ''
+labels: 'i: bug, 7.x: regression, i: needs triage'
+assignees: ''
+
+---
+
+# v7 Regression
+
+<!-- Check this if you would like to implement a PR, we are more than happy to help you go through the process !-->
+- [ ] I would like to work on a fix!
+
+> First check out: https://babeljs.io/docs/en/v7-migration
+> Also a partial upgrade tool: https://github.com/babel/babel-upgrade
+
+**Potential Commit/PR that introduced the regression**
+If you have time to investigate, what PR/date introduced this issue.
+
+**Describe the regression**
+A clear and concise description of what the regression is.
+
+**Input Code**
+<!--- If you have link to our REPL or a standalone repo please link that! -->
+
+```js
+var your => (code) => here;
+```
+
+**Expected behavior/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)**
+
+```js
+{
+  "your": { "config": "here" }
+}
+```
+
+**Environment**
+<!--- Tip: Instead of filling out the questions below, you can run `npx envinfo --preset babel` and paste the result below ``` -->
+```
+
+```
+- Babel version(s): [e.g. v6.0.0, v7.0.0-beta.34]
+- Node/npm version: [e.g. Node 8/npm 5]
+- OS: [e.g. OSX 10.13.4, Windows 10]
+- Monorepo [e.g. yes/no/Lerna]
+- How you are using Babel: [e.g. `cli`, `register`, `loader`]

.github/ISSUE_TEMPLATE/Support_question.md

@@ -0,0 +1,19 @@
+---
+name: "\U0001F917 Support Question"
+about: "If you have a question \U0001F4AC, please check out our Slack or StackOverflow!"
+title: ''
+labels: 'i: question, i: needs triage'
+assignees: ''
+
+---
+
+--------------^ Click "Preview" for a nicer view!
+We primarily use GitHub as an issue tracker; for usage and support questions, please check out these resources below. Thanks! 😁.
+
+---
+
+* Slack Community Chat: https://babeljs.slack.com (you can sign-up at https://slack.babeljs.io/ for an invite)
+* StackOverflow: https://stackoverflow.com/questions/tagged/babeljs using the tag `babeljs`
+* Twitter: If it's just a quick question you can ping our Twitter: https://twitter.com/babeljs
+* Also have a look at the readme for more information on how to get support:
+  https://github.com/babel/babel/blob/master/README.md

.github/ISSUE_TEMPLATE/Support_us.md

@@ -0,0 +1,28 @@
+---
+name: "\U0001F91D Support us on Babel"
+about: "If you would like to support our efforts in maintaining this community-driven
+  project \U0001F64C!"
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+--------------^ Click "Preview" for a nicer view!
+> Open Collective: https://opencollective.com/babel
+> Henry's Patreon: https://www.patreon.com/henryzhu
+
+Help support Babel!
+
+Babel has always been a community project, not really backed or owned by any single (or group) of companies. While some maintainers used to work at Facebook (and Henry at Adobe) no one was working on it full time and there certainly isn't a huge company or team anywhere doing all this work.
+
+---
+
+As a group of volunteers you can help us in a few ways
+
+- Giving developer time on the project. (Message us on [Twitter](https://twitter.com/babeljs) or [Slack](https://slack.babeljs.io/) for guidance). Companies should be paying their employees to contribute back to the open source projects they use everyday.
+- Giving funds by becoming one of our sponsors/donators!
+
+If you'd like to sustain the future of the project as a whole, we have an [Open Collective](https://opencollective.com/babel) that you can donate to. This is a way for funds to be allocated to the core team.
+
+You can also support [Henry](https://github.com/hzoo) directly since I [left my job to work on Babel and Open Source full time](https://twitter.com/left_pad/status/969793227862790144) at my [Patreon](https://www.patreon.com/henryzhu).

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,18 +1,22 @@
 <!--
-Before making a PR please make sure to read our contributing guidelines
+Before making a PR, please read our contributing guidelines
 https://github.com/babel/babel/blob/master/CONTRIBUTING.md
 
-For issue references: Add a comma-separated list of a [closing word](https://help.github.com/articles/closing-issues-via-commit-messages/) followed by the ticket number fixed by the PR. It should be underlined in the preview if done correctly.
+Please note that the Babel Team requires two approvals before merging most PRs.
+
+For issue references: Add a comma-separated list of a [closing word](https://help.github.com/articles/closing-issues-via-commit-messages/) followed by the ticket number fixed by the PR. (it should be underlined in the preview if done correctly)
+
+If you are making a change that should have a docs update: submit another PR to https://github.com/babel/website
 -->
 
 | Q                        | A <!--(Can use an emoji 👍) -->
 | ------------------------ | ---
-| Fixed Issues?            | `Fixes #1, Fixes #2` <!-- remove the (`) quotes to link the issues -->
+| Fixed Issues?            | `Fixes #1, Fixes #2` <!-- remove the (`) quotes and write "Fixes" before the number to link the issues -->
 | Patch: Bug Fix?          |
 | Major: Breaking Change?  |
 | Minor: New Feature?      |
 | Tests Added + Pass?      | Yes
-| Documentation PR         | <!-- If so, add `[skip ci]` to your commit message to skip CI -->
+| Documentation PR Link    | <!-- If only readme change, add `[skip ci]` to your commits -->
 | Any Dependency Changes?  |
 | License                  | MIT
 

.github/lock.yml

@@ -0,0 +1,12 @@
+# Configuration for lock-threads - https://github.com/dessant/lock-threads
+
+# Number of days of inactivity before a closed issue or pull request is locked
+daysUntilLock: 91
+# Comment to post before locking. Set to `false` to disable
+lockComment: false
+# The label to be applied when an issue is locked
+lockLabel: 'outdated'
+
+# Issues or pull requests with these labels will not be locked
+# exemptLabels:
+#   - no-locking

.github/workflows/coverage.yml

@@ -0,0 +1,29 @@
+name: Report Coverage
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [13.x]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v1
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Environment log
+        id: env
+        run: |
+          yarn --version
+      - name: Generate coverage report
+        run: |
+          yarn --version
+          make -j test-ci-coverage
+      - name: Upload coverage report
+        uses: codecov/codecov-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}

.github/workflows/issue-triage.yml

@@ -0,0 +1,81 @@
+name: Issue Triage
+
+on:
+  issues:
+    types: [opened, labeled]
+
+jobs:
+  welcome:
+    name: Welcome comment
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check if Babel member
+        id: is_babel_member
+        if: github.event.action == 'opened'
+        uses: babel/actions/is-org-member@v2
+        with:
+          org: babel
+          username: ${{ github.event.issue.user.login }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Create Welcome Comment
+        uses: babel/actions/create-comment@v2
+        if: |
+          github.event.action == 'opened' &&
+          steps.is_babel_member.outputs.result == 0
+        with:
+          token: ${{ secrets.BOT_TOKEN }}
+          issue: ${{ github.event.issue.number }}
+          comment: >
+            Hey @${{ github.event.issue.user.login }}!
+            We really appreciate you taking the time to report an issue. The 
+            collaborators on this project attempt to help as many people as 
+            possible, but we're a limited number of volunteers, so it's 
+            possible this won't be addressed swiftly.
+
+
+            If you need any help, or just have general Babel or JavaScript questions, we have a 
+            vibrant [Slack community](https://babeljs.slack.com) that typically always has someone 
+            willing to help. You can sign-up [here](https://slack.babeljs.io/) for an invite."
+
+  needs_info:
+    name: Needs Info
+    runs-on: ubuntu-latest
+    steps:
+      - name: Create Needs Info Comment
+        uses: babel/actions/create-comment@v2
+        if: |
+          github.event.action == 'labeled' &&
+          github.event.label.name == 'Needs Info'
+        with:
+          token: ${{ secrets.BOT_TOKEN }}
+          issue: ${{ github.event.issue.number }}
+          comment: >
+            Hi @${{ github.event.issue.user.login }}!
+            This issue is missing some important information we'll need
+            to be able to reproduce this issue.
+
+
+            Please understand that we receive a high volume of issues,
+            and there are only a limited number of volunteers that help
+            maintain this project. The easier it is for us to decipher an
+            issue with the info provided, the more likely it is that we'll
+            be able to help.
+
+
+            Please make sure you have the following information documented in
+            this ticket:
+            
+            1. Your Babel configuration (typically from `.babelrc` or `babel.config.js`)
+
+            2. The current (incorrect) behavior you're seeing
+
+            3. The behavior you expect
+
+            4. A [short, self-contained example](http://sscce.org/)
+
+
+            Please provide either a link to the problem via the
+            [`repl`](https://babeljs.io/repl/), or if the `repl` is
+            insufficient, a new and minimal repository with instructions on
+            how to build/replicate the issue.
+        

.github/workflows/release.yml

@@ -0,0 +1,53 @@
+name: Release
+
+on:
+  push:
+    tags: ["v*"]
+
+jobs:
+  github_release:
+    name: Trigger GitHub release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the new tag
+        uses: actions/checkout@v1.0.0
+
+      - name: Get tag info
+        id: tags
+        uses: babel/actions/get-release-tags@v2
+
+      - name: Generate the changelog
+        id: changelog
+        uses: babel/actions/generate-lerna-changelog@v2
+        with:
+          from: ${{ steps.tags.outputs.old }}
+          to: ${{ steps.tags.outputs.new }}
+        env:
+          GITHUB_AUTH: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Create a draft GitHub release
+        uses: babel/actions/publish-github-release@v2
+        with:
+          tag: ${{ steps.tags.outputs.new }}
+          changelog: ${{ steps.changelog.outputs.changelog }}
+          token: ${{ secrets.BOT_TOKEN }}
+
+      - name: Check if releasing from master
+        id: is_master
+        uses: babel/actions/ref-matches-branch@v2
+        with:
+          name: master
+
+      - name: Update CHANGELOG.md
+        if: steps.is_master.outputs.result == 1
+        uses: babel/actions/update-changelog@v2
+        with:
+          changelog: ${{ steps.changelog.outputs.changelog }}
+
+      - name: Commit CHANGELOG.md
+        if: steps.is_master.outputs.result == 1
+        run: |
+          git add CHANGELOG.md
+          git -c user.name="Babel Bot" -c user.email="babel-bot@users.noreply.github.com" \
+            commit -m "Add ${{ steps.tags.outputs.new }} to CHANGELOG.md [skip ci]" --no-verify --quiet
+          git push "https://babel-bot:${{ secrets.BOT_TOKEN }}@github.com/${GITHUB_REPOSITORY}.git" master

.gitignore

@@ -1,6 +1,12 @@
+.npmrc
+
 .DS_Store
 /node_modules
+/.github/actions/*/node_modules
 /packages/*/node_modules
+/packages/*/LICENSE
+!/packages/babel-parser/LICENSE
+!/packages/babel-plugin-transform-object-assign/LICENSE
 *.log
 *.cache
 /build
@@ -12,24 +18,35 @@ coverage
 dist
 /.package.json
 package-lock.json
-/packages/babel-runtime/core-js/**/*.js
-!/packages/babel-runtime/core-js/map.js
+!/.github/actions/*/package-lock.json
+
+/packages/babel-compat-data/build
+
 /packages/babel-runtime/helpers/*.js
 !/packages/babel-runtime/helpers/toArray.js
 !/packages/babel-runtime/helpers/iterableToArray.js
 !/packages/babel-runtime/helpers/temporalRef.js
-/packages/babel-runtime/helpers/builtin/*.js
-!/packages/babel-runtime/helpers/builtin/toArray.js
-!/packages/babel-runtime/helpers/builtin/iterableToArray.js
-!/packages/babel-runtime/helpers/builtin/temporalRef.js
-/packages/babel-runtime/helpers/builtin/es6/*.js
-!/packages/babel-runtime/helpers/builtin/es6/toArray.js
-!/packages/babel-runtime/helpers/builtin/es6/iterableToArray.js
-!/packages/babel-runtime/helpers/builtin/es6/temporalRef.js
-/packages/babel-runtime/helpers/es6/*.js
-!/packages/babel-runtime/helpers/es6/toArray.js
-!/packages/babel-runtime/helpers/es6/iterableToArray.js
-!/packages/babel-runtime/helpers/es6/temporalRef.js
+/packages/babel-runtime/helpers/esm/*.js
+!/packages/babel-runtime/helpers/esm/toArray.js
+!/packages/babel-runtime/helpers/esm/iterableToArray.js
+!/packages/babel-runtime/helpers/esm/temporalRef.js
+
+/packages/babel-runtime-corejs2/helpers/*.js
+!/packages/babel-runtime-corejs2/helpers/toArray.js
+!/packages/babel-runtime-corejs2/helpers/iterableToArray.js
+!/packages/babel-runtime-corejs2/helpers/temporalRef.js
+/packages/babel-runtime-corejs2/helpers/esm/*.js
+!/packages/babel-runtime-corejs2/helpers/esm/toArray.js
+!/packages/babel-runtime-corejs2/helpers/esm/iterableToArray.js
+!/packages/babel-runtime-corejs2/helpers/esm/temporalRef.js
+/packages/babel-runtime-corejs2/core-js/**/*.js
+!/packages/babel-runtime-corejs2/core-js/map.js
+
+/packages/babel-runtime-corejs3/helpers/*.js
+/packages/babel-runtime-corejs3/helpers/esm/*.js
+/packages/babel-runtime-corejs3/core-js/**/*.js
+/packages/babel-runtime-corejs3/core-js-stable/**/*.js
+
 /packages/babel-register/test/.babel
 /packages/babel-cli/test/tmp
 /packages/babel-node/test/tmp
@@ -37,10 +54,18 @@ package-lock.json
 .nyc_output
 /babel.sublime-workspace
 packages/babel-standalone/babel.js
+packages/babel-standalone/babel.js.map
 packages/babel-standalone/babel.min.js
 packages/babel-preset-env-standalone/babel-preset-env.js
+packages/babel-preset-env-standalone/babel-preset-env.js.map
 packages/babel-preset-env-standalone/babel-preset-env.min.js
 /codemods/*/lib
 /codemods/*/node_modules
-/packages/babylon/build
+/packages/babel-parser/build
 .idea/
+/.changelog
+
+/eslint/*/lib
+/eslint/*/node_modules
+/eslint/*/LICENSE
+!/packages/babel-eslint-plugin/LICENSE

.prettierignore

@@ -1 +1,7 @@
 package.json
+packages/babel-preset-env/data
+packages/babel-compat-data/data
+packages/babel-compat-data/scripts/data/overlapping-plugins.js
+packages/*/test/fixtures/**/input.*
+packages/*/test/fixtures/**/exec.*
+packages/*/test/fixtures/**/output.*

.prettierrc

@@ -7,16 +7,18 @@
   "bracketSpacing": true,
   "jsxBracketSameLine": false,
   "tabWidth": 2,
-  "parser": "babylon",
   "printWidth": 80,
   "overrides": [{
     "files": [
       "**/codemods/*/src/**/*.js",
       "**/codemods/*/test/**/*.js",
       "**/packages/*/src/**/*.js",
-      "**/packages/*/test/**/*.js"
+      "**/packages/*/test/**/*.js",
+      "**/eslint/*/src/**/*.js",
+      "**/eslint/*/test/**/*.js"
     ],
     "options": {
+      "parser": "babel",
       "trailingComma": "all"
     }
   }]

.travis.yml

@@ -1,46 +1,56 @@
 git:
-  depth: 10
-sudo: false
+  depth: 5
 language: node_js
 cache:
   yarn: true
-  directories:
-  - node_modules
-node_js:
-  # We test the latest version on circleci
-  - '8'
-  - '6'
-  - '4'
+
+os: linux
 
 env:
   global:
     - PATH=$HOME/.yarn/bin:$PATH
     - JOB=test
 
-before_install:
-  - curl -o- -L https://yarnpkg.com/install.sh | bash
-
-install: yarn --ignore-engines
-
+install: skip
 before_script:
-  - 'if [ "$JOB" = "babylon-flow-tests" ]; then make bootstrap-flow; fi'
-  - 'if [ "$JOB" = "babylon-test262-tests" ]; then make bootstrap-test262; fi'
+  - curl -o- -L https://yarnpkg.com/install.sh | bash
+  - if [ "$TRAVIS_OS_NAME" = "windows" ]; then choco install make; fi
 
 script:
-  - 'if [ "$JOB" = "test" ]; then make test-ci; fi'
-  - 'if [ "$JOB" = "lint" ]; then make lint && make flow; fi'
-  - 'if [ "$JOB" = "babylon-flow-tests" ]; then make test-flow-ci; fi'
-  - 'if [ "$JOB" = "babylon-test262-tests" ]; then make test-test262-ci; fi'
+  - if [ "$JOB" = "test" ]; then make -j test-ci; fi
+  - if [ "$JOB" = "lint" ]; then make -j code-quality-ci; fi
+  - if [ "$JOB" = "babel-parser-flow-tests" ]; then make -j test-flow-ci; fi
+  - if [ "$JOB" = "babel-parser-typescript-tests" ]; then make -j test-typescript-ci; fi
+  - if [ "$JOB" = "babel-parser-test262-tests" ]; then make -j test-test262-ci; fi
 
 matrix:
   fast_finish: true
   include:
     - node_js: "node"
       env: JOB=lint
+    # We test the latest version on circleci
+    - node_js: "12"
+    # Move `windows` build to be the third since it is slow
+    - os: windows
+      node_js: "node"
+      env:
+        - JOB=test
+        # https://travis-ci.community/t/build-doesnt-finish-after-completing-tests/288/9
+        - YARN_GPG=no
+      cache:
+        yarn: true
+        directories:
+          - $HOME/AppData/Local/Temp/chocolatey
+    # Continue node_js matrix
+    - node_js: "6"
+    - node_js: "10"
+    - node_js: "8"
     - node_js: "node"
-      env: JOB=babylon-flow-tests
+      env: JOB=babel-parser-flow-tests
     - node_js: "node"
-      env: JOB=babylon-test262-tests
+      env: JOB=babel-parser-typescript-tests
+    - node_js: "node"
+      env: JOB=babel-parser-test262-tests
 
 notifications:
   slack:

CODE_OF_CONDUCT.md

@@ -3,7 +3,7 @@
 ## Our Pledge
 
 In the interest of fostering an open and welcoming environment, we as
-contributors and maintainers pledge to making participation in our project and
+contributors and maintainers pledge to make participation in our project and
 our community a harassment-free experience for everyone, regardless of age, body
 size, disability, ethnicity, gender identity and expression, level of experience,
 nationality, personal appearance, race, religion, or sexual identity and
@@ -55,7 +55,7 @@ further defined and clarified by project maintainers.
 ## Enforcement
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
-reported by contacting hzoo, thejameskyle, sebastian, or loganfsmyth on [Slack](https://slack.babeljs.io/). All
+reported by contacting Henry Zhu <hi@henryzoo.com>, Logan Smyth <loganfsmyth@gmail.com> or one of the other [Babel core team members](https://babeljs.io/team). All
 complaints will be reviewed and investigated and will result in a response that
 is deemed necessary and appropriate to the circumstances. The project team is
 obligated to maintain confidentiality with regard to the reporter of an incident.

CONTRIBUTING.md

@@ -1,4 +1,4 @@
-----
+---
 
 <p align="center" class="toc">
    <strong><a href="#setup">Setup</a></strong>
@@ -12,8 +12,7 @@
    <strong><a href="#internals">Internals</a></strong>
 </p>
 
-----
-
+---
 
 # Contributing
 
@@ -24,31 +23,37 @@ contributing, please read the
 ## Not sure where to start?
 
 - If you aren't just making a documentation change, you'll probably want to learn a bit about a few topics.
- - [ASTs](https://en.wikipedia.org/wiki/Abstract_syntax_tree) (Abstract Syntax Tree): The Babel AST [spec](https://github.com/babel/babel/blob/master/packages/babylon/ast/spec.md) is a bit different from [ESTree](https://github.com/estree/estree). The differences are listed [here](https://github.com/babel/babel/tree/master/packages/babylon#output).
- - Check out [`/doc`](https://github.com/babel/babel/tree/master/doc) for information about Babel's internals
- - Check out [the Babel Plugin Handbook](https://github.com/thejameskyle/babel-handbook/blob/master/translations/en/plugin-handbook.md#babel-plugin-handbook) - core plugins are written the same way as any other plugin!
- - Check out [AST Explorer](http://astexplorer.net/#/scUfOmVOG5) to learn more about ASTs or make your own plugin in the browser
+  - [ASTs](https://en.wikipedia.org/wiki/Abstract_syntax_tree) (Abstract Syntax Tree): The Babel AST [spec](https://github.com/babel/babel/blob/master/packages/babel-parser/ast/spec.md) is a bit different from [ESTree](https://github.com/estree/estree). The differences are listed [here](https://babeljs.io/docs/en/next/babel-parser.html#output).
+  - Check out [`/doc`](https://github.com/babel/babel/tree/master/doc) for information about Babel's internals
+  - Check out [the Babel Plugin Handbook](https://github.com/thejameskyle/babel-handbook/blob/master/translations/en/plugin-handbook.md#babel-plugin-handbook) - core plugins are written the same way as any other plugin!
+  - Check out [AST Explorer](http://astexplorer.net/#/scUfOmVOG5) to learn more about ASTs or make your own plugin in the browser
 - When you feel ready to jump into the Babel source code, a good place to start is to look for issues tagged with [help wanted](https://github.com/babel/babel/labels/help%20wanted) and/or [good first issue](https://github.com/babel/babel/labels/good%20first%20issue).
-- Follow along with what we are working on by joining our Slack, following our announcements on [Twitter](https://twitter.com/babeljs), and reading (or participating!) in our [meeting notes](https://github.com/babel/notes).
+- Follow along with what we are working on by joining our [Slack](https://babeljs.slack.com) (you can sign-up [here](https://slack.babeljs.io/)
+  for an invite), following our announcements on [Twitter](https://twitter.com/babeljs), and reading (or participating!) in our [meeting notes](https://github.com/babel/notes).
 - Check out our [website](http://babeljs.io/) and the [repo](https://github.com/babel/website)
+- You can contribute by triaging issues which may include reproducing bug reports or asking for vital information, such as version numbers or reproduction instructions. If you would like to start triaging issues, one easy way to get started is to [subscribe to babel on CodeTriage](https://www.codetriage.com/babel/babel). [![Open Source Helpers](https://www.codetriage.com/babel/babel/badges/users.svg)](https://www.codetriage.com/babel/babel)
 
 ## Chat
 
-Feel free to check out the `#discussion`/`#development` channels on our [Slack](https://slack.babeljs.io). Some of us are always online to chat!
+Feel free to check out the `#discussion`/`#development` channels on our [Slack](https://slack.babeljs.io) (you can sign-up [here](https://slack.babeljs.io/) for an invite). Some of us are always online to chat!
 
 ## Developing
 
 **Note:** Versions `< 5.1.10` can't be built.
 
-Babel is built for Node 4 and up but we develop using Node 8 and yarn. You can check this with `node -v`.
+Babel is built for Node 6 and up but we develop using Node 8 and yarn. You can check this with `node -v`.
 
 Make sure that Yarn is installed with version >= `0.28.0`.
 Installation instructions can be found here: https://yarnpkg.com/en/docs/install.
 
 ### Setup
 
+Fork the `babel` repository to your GitHub Account.
+
+Then, run:
+
 ```sh
-$ git clone https://github.com/babel/babel
+$ git clone https://github.com/<your-github-username>/babel
 $ cd babel
 $ make bootstrap
 ```
@@ -139,6 +144,12 @@ $ TEST_DEBUG=true make test
 
 You can combine `TEST_DEBUG` with `TEST_GREP` or `TEST_ONLY` to debug a subset of tests. If you plan to stay long in the debugger (which you'll likely do!), you may increase the test timeout by editing [test/mocha.opts](https://github.com/babel/babel/blob/master/test/mocha.opts).
 
+To overwrite any test fixtures when fixing a bug or anything, add the env variable `OVERWRITE=true`
+
+```sh
+$ OVERWRITE=true TEST_ONLY=babel-plugin-transform-classes make test-only
+```
+
 To test the code coverage, use:
 
 ```sh
@@ -150,12 +161,12 @@ $ ./scripts/test-cov.sh
 
 In case you're not able to reproduce an error on CI locally, it may be due to
 
- - Node Version: Travis CI runs the tests against all major node versions. If your tests use JavaScript features unsupported by lower versions of node, then use [minNodeVersion option](#writing-tests) in options.json.
- - Timeout: Check the CI log and if the only errors are timeout errors and you are sure that it's not related to the changes you made, ask someone in the slack channel to trigger rebuild on the CI build and it might be resolved
+- Node Version: Travis CI runs the tests against all major node versions. If your tests use JavaScript features unsupported by lower versions of node, then use [minNodeVersion option](#writing-tests) in options.json.
+- Timeout: Check the CI log and if the only errors are timeout errors and you are sure that it's not related to the changes you made, ask someone in the slack channel to trigger rebuild on the CI build and it might be resolved
 
 In case you're locally getting errors which are not on the CI, it may be due to
 
- - Updates in Dependencies: Make sure you run `make bootstrap` before you run `make build` or `make watch` before you run the tests.
+- Updates in Dependencies: Make sure you run `make bootstrap` before you run `make build` or `make watch` before you run the tests.
 
 ### Writing tests
 
@@ -169,17 +180,18 @@ For example, in [`@babel/plugin-transform-exponentiation-operator/test`](https:/
 
 - There is an `index.js` file. It imports our [test helper](https://github.com/babel/babel/tree/master/packages/babel-helper-plugin-test-runner). (You don't have to worry about this).
 - There can be multiple folders under [`/fixtures`](https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures)
-   - There is an [`options.json`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/options.json) file whose function is similar to a `.babelrc` file, allowing you to pass in the plugins and settings you need for your tests.
-   - For this test, we only need the relevant plugin, so it's just `{ "plugins": ["@babel/plugin-transform-exponentiation-operator"] }`.
-   - If necessary, you can have an `options.json` with different options in each subfolder.
+
+  - There is an [`options.json`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/options.json) file whose function is similar to a `.babelrc` file, allowing you to pass in the plugins and settings you need for your tests.
+  - For this test, we only need the relevant plugin, so it's just `{ "plugins": ["@babel/plugin-transform-exponentiation-operator"] }`.
+  - If necessary, you can have an `options.json` with different options in each subfolder.
 
 - In each subfolder, you can organize your directory structure by categories of tests. (Example: these folders can be named after the feature you are testing or can reference the issue number they fix)
 - Generally, there are two kinds of tests for plugins
-   - The first is a simple test of the input and output produced by running Babel on some code. We do this by creating an [`input.js`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/binary/input.js) file and an [`output.js`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/binary/output.js) file. This kind of test only works in sub-subdirectories of `/fixtures`, i.e. `/fixtures/exponentian-operator/binary/input.js` and **not** `/fixtures/exponentian-operator/input.js`.
-   - If you need to expect an error, you can ignore creating the `output.js` file and pass a new `throws` key to the `options.json` that contains the error string that is created.
-   - The second and preferred type is a test that actually evaluates the produced code and asserts that certain properties are true or false. We do this by creating an [`exec.js`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/comprehensive/exec.js) file.
+    - The first is a simple test of the input and output produced by running Babel on some code. We do this by creating an [`input.js`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/binary/input.js) file and an [`output.js`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/binary/output.js) file. This kind of test only works in sub-subdirectories of `/fixtures`, i.e. `/fixtures/exponentian-operator/binary/input.js` and **not** `/fixtures/exponentian-operator/input.js`.
+  - If you need to expect an error, you can ignore creating the `output.js` file and pass a new `throws` key to the `options.json` that contains the error string that is created.
+  - The second and preferred type is a test that actually evaluates the produced code and asserts that certain properties are true or false. We do this by creating an [`exec.js`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/comprehensive/exec.js) file.
 
-In a fixture test, you simply write out the code you want transformed in `input.js`.
+In a fixture test, you simply write out the code you want to transform in `input.js`.
 
 ```js
 // input.js
@@ -192,12 +204,13 @@ and the expected output after transforming it with your `options.json` in `outpu
 // output.js
 Math.pow(2, 2);
 ```
+
 In an `exec.js` test, we run or check that the code actually does what it's supposed to do rather than just check the static output.
 
 ```js
 // exec.js
-assert.equal(8, 2 ** 3);
-assert.equal(24, 3 * 2 ** 3);
+expect(2 ** 3).toBe(8);
+expect(3 * 2 ** 3).toBe(24);
 ```
 
 If you need to check for an error that is thrown you can add to the `options.json`
@@ -219,19 +232,19 @@ If the test requires a minimum Node version, you can add `minNodeVersion` (must
 }
 ```
 
-#### `babylon`
+#### `@babel/parser` (babylon)
 
-Writing tests for Babylon is very
+Writing tests for the babel parser is very
 similar to the other packages.
-Inside the `packages/babylon/tests/fixtures` folder are categories/groupings of test fixtures (es2015, flow,
+Inside the `packages/babel-parser/test/fixtures` folder are categories/groupings of test fixtures (es2015, flow,
 etc.). To add a test, create a folder under one of these groupings (or create a new one) with a
 descriptive name, and add the following:
 
-* Create an `input.js` file that contains the code you want Babylon to parse.
+- Create an `input.js` file that contains the code you want the babel parser to parse.
 
-* Add an `output.json` file with the expected parser output. For added convenience, if there is no `output.json` present, the test runner will generate one for you.
+- Add an `output.json` file with the expected parser output. For added convenience, if there is no `output.json` present, the test runner will generate one for you.
 
-After writing tests for babylon, just build it by running:
+After writing tests for @babel/parser, just build it by running:
 
 ```sh
 $ make build
@@ -240,17 +253,17 @@ $ make build
 Then, to run the tests, use:
 
 ```sh
-$ TEST_ONLY=babylon make test-only
+$ TEST_ONLY=babel-parser make test-only
 ```
 
 #### Bootstrapping expected output
 
-For both `@babel/plugin-x` and `babylon`, you can easily generate an `output.js`/`output.json` automatically by just providing `input.js` and running the tests as you usually would.
+For both `@babel/plugin-x` and `@babel/parser`, you can easily generate an `output.js`/`output.json` automatically by just providing `input.js` and running the tests as you usually would.
 
 ```
 // Example
 - packages
-  - babylon
+  - babel-parser
     - test
       - fixtures
         - comments
@@ -302,14 +315,15 @@ Note that the code shown in Chrome DevTools is compiled code and therefore diffe
 
 - Create a new issue that describes the proposal (ex: [#538](https://github.com/babel/babylon/issues/538)). Include any relevant information like proposal repo/author, examples, parsing approaches, meeting notes, presentation slides, and more.
 - The pull request should include:
-  - [ ] An update to the [plugins](https://github.com/babel/babel/tree/master/packages/babylon#plugins) part of the readme. Add a new entry to that list for the new plugin flag (and link to the proposal)
-  - [ ] If any new nodes or modifications need to be added to the AST, update [ast/spec.md](https://github.com/babel/babel/bloc/master/packages/babylon/ast/spec.md)
-  - [ ] Make sure you use the `this.hasPlugin("plugin-name-here")` check in Babylon so that your new plugin code only runs when that flag is turned on (not default behavior)
+  - [ ] An update to the [plugins](https://github.com/babel/babel/tree/master/packages/babel-parser#plugins) part of the readme. Add a new entry to that list for the new plugin flag (and link to the proposal)
+  - [ ] If any new nodes or modifications need to be added to the AST, update [ast/spec.md](https://github.com/babel/babel/blob/master/packages/babel-parser/ast/spec.md)
+  - [ ] Make sure you use the `this.hasPlugin("plugin-name-here")` check in the babel parser so that your new plugin code only runs when that flag is turned on (not default behavior)
   - [ ] Add failing/passing tests according to spec behavior
 - Start working about the Babel transform itself!
 
 ## Internals
-- AST spec ([babylon/ast/spec.md](https://github.com/babel/babel/blob/master/packages/babylon/ast/spec.md))
+
+- AST spec ([babel-parser/ast/spec.md](https://github.com/babel/babel/blob/master/packages/babel-parser/ast/spec.md))
 - Versioning ([doc/design/versioning.md](https://github.com/babel/babel/blob/master/doc/design/versioning.md))
 - Monorepo ([doc/design/monorepo.md](https://github.com/babel/babel/blob/master/doc/design/monorepo.md))
 - Compiler environment support ([doc/design/compiler-environment-support.md](https://github.com/babel/babel/blob/master/doc/design/compiler-environment-support.md))

Gulpfile.js

@@ -5,44 +5,38 @@ const through = require("through2");
 const chalk = require("chalk");
 const newer = require("gulp-newer");
 const babel = require("gulp-babel");
-const watch = require("gulp-watch");
-const gutil = require("gulp-util");
+const gulpWatch = require("gulp-watch");
+const fancyLog = require("fancy-log");
 const filter = require("gulp-filter");
 const gulp = require("gulp");
 const path = require("path");
-const webpack = require("webpack");
-const merge = require("merge-stream");
-const rollup = require("rollup-stream");
-const source = require("vinyl-source-stream");
-const buffer = require("vinyl-buffer");
+const rollup = require("rollup");
+const rollupAlias = require("@rollup/plugin-alias");
 const rollupBabel = require("rollup-plugin-babel");
+const rollupBabelSource = require("./scripts/rollup-plugin-babel-source");
+const rollupCommonJs = require("rollup-plugin-commonjs");
+const rollupJson = require("@rollup/plugin-json");
+const rollupNodeBuiltins = require("rollup-plugin-node-builtins");
+const rollupNodeGlobals = require("rollup-plugin-node-globals");
 const rollupNodeResolve = require("rollup-plugin-node-resolve");
-const registerStandalonePackageTask = require("./scripts/gulp-tasks")
-  .registerStandalonePackageTask;
+const rollupReplace = require("rollup-plugin-replace");
+const { terser: rollupTerser } = require("rollup-plugin-terser");
 
-const sources = ["codemods", "packages"];
+const defaultSourcesGlob = "./@(codemods|packages|eslint)/*/src/**/*.js";
 
 function swapSrcWithLib(srcPath) {
   const parts = srcPath.split(path.sep);
-  parts[1] = "lib";
+  parts[2] = "lib";
   return parts.join(path.sep);
 }
 
-function getGlobFromSource(source) {
-  return `./${source}/*/src/**/*.js`;
-}
-
 function getIndexFromPackage(name) {
   return `${name}/src/index.js`;
 }
 
-function compilationLogger(rollup) {
+function compilationLogger() {
   return through.obj(function(file, enc, callback) {
-    gutil.log(
-      `Compiling '${chalk.cyan(file.relative)}'${
-        rollup ? " with rollup " : ""
-      }...`
-    );
+    fancyLog(`Compiling '${chalk.cyan(file.relative)}'...`);
     callback(null, file);
   });
 }
@@ -50,7 +44,7 @@ function compilationLogger(rollup) {
 function errorsLogger() {
   return plumber({
     errorHandler(err) {
-      gutil.log(err.stack);
+      fancyLog(err.stack);
     },
   });
 }
@@ -62,108 +56,247 @@ function rename(fn) {
   });
 }
 
-function buildBabel(exclude) {
-  return merge(
-    sources.map(source => {
-      const base = path.join(__dirname, source);
+function buildBabel(exclude, sourcesGlob = defaultSourcesGlob) {
+  const base = __dirname;
 
-      let stream = gulp.src(getGlobFromSource(source), { base: base });
+  let stream = gulp.src(sourcesGlob, { base: __dirname });
 
-      if (exclude) {
-        const filters = exclude.map(p => `!**/${p}/**`);
-        filters.unshift("**");
-        stream = stream.pipe(filter(filters));
-      }
+  if (exclude) {
+    const filters = exclude.map(p => `!**/${p}/**`);
+    filters.unshift("**");
+    stream = stream.pipe(filter(filters));
+  }
 
-      return stream
-        .pipe(errorsLogger())
-        .pipe(newer({ dest: base, map: swapSrcWithLib }))
-        .pipe(compilationLogger())
-        .pipe(babel())
-        .pipe(
-          // Passing 'file.relative' because newer() above uses a relative
-          // path and this keeps it consistent.
-          rename(file => path.resolve(file.base, swapSrcWithLib(file.relative)))
-        )
-        .pipe(gulp.dest(base));
-    })
-  );
+  return stream
+    .pipe(errorsLogger())
+    .pipe(newer({ dest: base, map: swapSrcWithLib }))
+    .pipe(compilationLogger())
+    .pipe(babel())
+    .pipe(
+      // Passing 'file.relative' because newer() above uses a relative
+      // path and this keeps it consistent.
+      rename(file => path.resolve(file.base, swapSrcWithLib(file.relative)))
+    )
+    .pipe(gulp.dest(base));
 }
 
+let babelVersion = require("./packages/babel-core/package.json").version;
 function buildRollup(packages) {
-  return merge(
-    packages.map(pkg => {
-      return rollup({
-        input: getIndexFromPackage(pkg),
-        format: "cjs",
-        plugins: [
-          rollupBabel({
-            envName: "babylon",
-            babelrc: false,
-            extends: "./.babelrc.js",
-          }),
-          rollupNodeResolve(),
-        ],
-      })
-        .pipe(source("index.js"))
-        .pipe(buffer())
-        .pipe(errorsLogger())
-        .pipe(compilationLogger(/* rollup */ true))
-        .pipe(gulp.dest(path.join(pkg, "lib")));
-    })
+  const sourcemap = process.env.NODE_ENV === "production";
+  const minify = !!process.env.IS_PUBLISH;
+  return Promise.all(
+    packages.map(
+      ({ src, format, dest, name, filename, version = babelVersion }) => {
+        const extraPlugins = [];
+        let inputExternal = undefined,
+          outputGlobals = undefined,
+          nodeResolveBrowser = false,
+          babelEnvName = "rollup";
+        switch (src) {
+          case "packages/babel-standalone":
+            nodeResolveBrowser = true;
+            babelEnvName = "standalone";
+            if (minify) {
+              extraPlugins.push(
+                rollupTerser({
+                  include: /^.+\.min\.js$/,
+                })
+              );
+            }
+            break;
+          case "packages/babel-preset-env-standalone":
+            nodeResolveBrowser = true;
+            babelEnvName = "standalone";
+            if (minify) {
+              extraPlugins.push(
+                rollupTerser({
+                  include: /^.+\.min\.js$/,
+                })
+              );
+            }
+            inputExternal = ["@babel/standalone"];
+            outputGlobals = {
+              "@babel/standalone": "Babel",
+            };
+            extraPlugins.push(
+              rollupAlias({
+                entries: [
+                  {
+                    find: "./available-plugins",
+                    replacement: require.resolve(
+                      path.join(__dirname, src, "./src/available-plugins")
+                    ),
+                  },
+                  {
+                    find: "caniuse-lite/data/regions",
+                    replacement: require.resolve(
+                      path.join(__dirname, src, "./src/caniuse-lite-regions")
+                    ),
+                  },
+                ],
+              })
+            );
+            break;
+        }
+        // If this build is part of a pull request, include the pull request number in
+        // the version number.
+        if (process.env.CIRCLE_PR_NUMBER) {
+          const prVersion = "+pr." + process.env.CIRCLE_PR_NUMBER;
+          babelVersion += prVersion;
+          version += prVersion;
+        }
+        const input = getIndexFromPackage(src);
+        fancyLog(`Compiling '${chalk.cyan(input)}' with rollup ...`);
+        return rollup
+          .rollup({
+            input,
+            external: inputExternal,
+            plugins: [
+              ...extraPlugins,
+              rollupBabelSource(),
+              rollupReplace({
+                "process.env.NODE_ENV": JSON.stringify(process.env.NODE_ENV),
+                BABEL_VERSION: JSON.stringify(babelVersion),
+                VERSION: JSON.stringify(version),
+              }),
+              rollupBabel({
+                envName: babelEnvName,
+                babelrc: false,
+                extends: "./babel.config.js",
+              }),
+              rollupNodeResolve({
+                browser: nodeResolveBrowser,
+                preferBuiltins: true,
+                //todo: When Yarn workspaces is enabled, remove `dedupe` option
+                dedupe(importee) {
+                  return (
+                    importee.startsWith("lodash/") ||
+                    [
+                      "babel-plugin-dynamic-import-node/utils",
+                      "esutils",
+                      "semver",
+                      "source-map",
+                    ].includes(importee)
+                  );
+                },
+              }),
+              rollupCommonJs({
+                include: [
+                  /node_modules/,
+                  "packages/babel-runtime/regenerator/**",
+                  "packages/babel-preset-env/data/*.js",
+                  // Rollup doesn't read export maps, so it loads the cjs fallback
+                  "packages/babel-compat-data/*.js",
+                ],
+                namedExports: {
+                  "babel-plugin-dynamic-import-node/utils.js": [
+                    "createDynamicImportTransform",
+                    "getImportSource",
+                  ],
+                  "@babel/standalone": ["availablePlugins", "registerPlugin"],
+                },
+              }),
+              rollupJson(),
+              rollupNodeBuiltins(),
+              rollupNodeGlobals({ sourceMap: sourcemap }),
+            ],
+          })
+          .then(bundle => {
+            const outputFile = path.resolve(src, dest, filename || "index.js");
+            return bundle
+              .write({
+                file: outputFile,
+                format,
+                name,
+                globals: outputGlobals,
+                sourcemap: sourcemap,
+              })
+              .then(() => {
+                if (!process.env.IS_PUBLISH) {
+                  fancyLog(
+                    chalk.yellow(
+                      `Skipped minification of '${chalk.cyan(
+                        path.relative(path.join(__dirname, ".."), outputFile)
+                      )}' because not publishing`
+                    )
+                  );
+                  return undefined;
+                }
+                fancyLog(
+                  `Minifying '${chalk.cyan(
+                    path.relative(path.join(__dirname, ".."), outputFile)
+                  )}'...`
+                );
+
+                return bundle.write({
+                  file: outputFile.replace(/\.js$/, ".min.js"),
+                  format,
+                  name,
+                  globals: outputGlobals,
+                  sourcemap: sourcemap,
+                });
+              });
+          });
+      }
+    )
   );
 }
 
-gulp.task("default", ["build"]);
+const libBundles = [
+  {
+    src: "packages/babel-parser",
+    format: "cjs",
+    dest: "lib",
+    version: require("./packages/babel-parser/package").version,
+  },
+];
 
-gulp.task("build", function() {
-  const bundles = ["packages/babylon"];
+const standaloneBundle = [
+  {
+    src: "packages/babel-standalone",
+    format: "umd",
+    name: "Babel",
+    filename: "babel.js",
+    dest: "",
+    version: require("./packages/babel-core/package").version,
+  },
+];
 
-  return merge([buildBabel(/* exclude */ bundles), buildRollup(bundles)]);
-});
+const presetEnvStandaloneBundle = [
+  {
+    src: "packages/babel-preset-env-standalone",
+    format: "umd",
+    name: "BabelPresetEnv",
+    filename: "babel-preset-env.js",
+    dest: "",
+    version: require("./packages/babel-preset-env/package").version,
+  },
+];
+
+gulp.task("build-rollup", () => buildRollup(libBundles));
+gulp.task("build-babel-standalone", () => buildRollup(standaloneBundle));
+
+gulp.task("build-babel-preset-env-standalone", () =>
+  buildRollup(presetEnvStandaloneBundle)
+);
+
+gulp.task("build-babel", () => buildBabel(/* exclude */ libBundles));
+gulp.task("build-babel-types", () =>
+  buildBabel(/* exclude */ libBundles, "packages/babel-types/src/**/*.js")
+);
+gulp.task("build", gulp.parallel("build-rollup", "build-babel"));
+
+gulp.task("default", gulp.series("build"));
 
 gulp.task("build-no-bundle", () => buildBabel());
 
-gulp.task("watch", ["build-no-bundle"], function() {
-  watch(sources.map(getGlobFromSource), { debounceDelay: 200 }, function() {
-    gulp.start("build-no-bundle");
-  });
-});
-
-registerStandalonePackageTask(
-  gulp,
-  "babel",
-  "Babel",
-  path.join(__dirname, "packages"),
-  require("./packages/babel-core/package.json").version
-);
-
-const presetEnvWebpackPlugins = [
-  new webpack.NormalModuleReplacementPlugin(
-    /\.\/available-plugins/,
-    require.resolve(
-      path.join(
-        __dirname,
-        "./packages/babel-preset-env-standalone/src/available-plugins"
-      )
-    )
-  ),
-  new webpack.NormalModuleReplacementPlugin(
-    /caniuse-lite\/data\/regions\/.+/,
-    require.resolve(
-      path.join(
-        __dirname,
-        "./packages/babel-preset-env-standalone/src/caniuse-lite-regions"
-      )
-    )
-  ),
-];
-
-registerStandalonePackageTask(
-  gulp,
-  "babel-preset-env",
-  "babelPresetEnv",
-  path.join(__dirname, "packages"),
-  require("./packages/babel-preset-env/package.json").version,
-  presetEnvWebpackPlugins
+gulp.task(
+  "watch",
+  gulp.series("build-no-bundle", function watch() {
+    gulpWatch(
+      defaultSourcesGlob,
+      { debounceDelay: 200 },
+      gulp.task("build-no-bundle")
+    );
+  })
 );

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2014-2018 Sebastian McKenzie <sebmck@gmail.com>
+Copyright (c) 2014-present Sebastian McKenzie and other contributors
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

Makefile

@@ -1,62 +1,129 @@
-MAKEFLAGS = -j1
-FLOW_COMMIT = 622bbc4f07acb77eb1109830c70815f827401d90
-TEST262_COMMIT = 52f70e2f637731aae92a9c9a2d831310c3ab2e1e
+FLOW_COMMIT = a1f9a4c709dcebb27a5084acf47755fbae699c25
+TEST262_COMMIT = 28b4fcca4b1b1d278dfe0cc0e69c7d9d59b31aab
+TYPESCRIPT_COMMIT = 5fc917be2e4dd64c8e9504d36615cd7fbfdd4cd3
+
+FORCE_PUBLISH = "@babel/runtime,@babel/runtime-corejs2,@babel/runtime-corejs3,@babel/standalone,@babel/preset-env-standalone"
 
 # Fix color output until TravisCI fixes https://github.com/travis-ci/travis-ci/issues/7967
 export FORCE_COLOR = true
 
-SOURCES = packages codemods
+SOURCES = packages codemods eslint
+
+COMMA := ,
+EMPTY :=
+SPACE := $(EMPTY) $(EMPTY)
+COMMA_SEPARATED_SOURCES = $(subst $(SPACE),$(COMMA),$(SOURCES))
+
 
 .PHONY: build build-dist watch lint fix clean test-clean test-only test test-ci publish bootstrap
 
-build: clean clean-lib
-	./node_modules/.bin/gulp build
-	node ./packages/babel-types/scripts/generateTypeHelpers.js
-	# call build again as the generated files might need to be compiled again.
-	./node_modules/.bin/gulp build
-	# generate flow and typescript typings
-	node scripts/generators/flow.js > ./packages/babel-types/lib/index.js.flow
-	node scripts/generators/typescript.js > ./packages/babel-types/lib/index.d.ts
-	# generate docs
-	node scripts/generators/docs.js > ./packages/babel-types/README.md
+build: build-bundle
 ifneq ("$(BABEL_COVERAGE)", "true")
-	make build-standalone
-	make build-preset-env-standalone
+	$(MAKE) build-standalone
 endif
 
-build-standalone:
-	./node_modules/.bin/gulp build-babel-standalone
+build-bundle: clean clean-lib
+	yarn gulp build
+	$(MAKE) generate-standalone generate-type-helpers
+	# call build again as the generated files might need to be compiled again.
+	yarn gulp build
+	$(MAKE) build-typings
+	$(MAKE) build-dist
+
+build-bundle-ci: bootstrap-only
+	$(MAKE) build-bundle
+
+generate-standalone:
+	node packages/babel-standalone/scripts/generate.js
+
+generate-type-helpers:
+	node packages/babel-types/scripts/generateTypeHelpers.js
+
+build-typings: build-flow-typings build-typescript-typings
+
+build-flow-typings:
+	node packages/babel-types/scripts/generators/flow.js > packages/babel-types/lib/index.js.flow
+
+build-typescript-typings:
+	node packages/babel-types/scripts/generators/typescript.js > packages/babel-types/lib/index.d.ts
+
+build-standalone: build-babel-standalone build-preset-env-standalone
+
+build-standalone-ci: build-bundle-ci
+	$(MAKE) build-standalone
+
+build-babel-standalone:
+	yarn gulp build-babel-standalone
 
 build-preset-env-standalone:
-	./node_modules/.bin/gulp build-babel-preset-env-standalone
+	yarn gulp build-babel-preset-env-standalone
 
-build-dist: build
+prepublish-build-standalone:
+	BABEL_ENV=production IS_PUBLISH=true yarn gulp build-babel-standalone
+
+prepublish-build-preset-env-standalone:
+	BABEL_ENV=production IS_PUBLISH=true yarn gulp build-babel-preset-env-standalone
+
+build-dist: build-polyfill-dist build-plugin-transform-runtime-dist
+
+build-polyfill-dist:
 	cd packages/babel-polyfill; \
 	scripts/build-dist.sh
-	cd packages/babel-runtime; \
+
+build-plugin-transform-runtime-dist:
+	cd packages/babel-plugin-transform-runtime; \
 	node scripts/build-dist.js
 
-watch: clean clean-lib
-
+build-no-bundle: clean clean-lib
+	BABEL_ENV=development yarn gulp build-no-bundle
 	# Ensure that build artifacts for types are created during local
 	# development too.
-	BABEL_ENV=development ./node_modules/.bin/gulp build-no-bundle
-	node ./packages/babel-types/scripts/generateTypeHelpers.js
-	node scripts/generators/flow.js > ./packages/babel-types/lib/index.js.flow
-	BABEL_ENV=development ./node_modules/.bin/gulp watch
+	$(MAKE) generate-type-helpers
+	$(MAKE) build-typings
+
+watch: build-no-bundle
+	BABEL_ENV=development yarn gulp watch
+
+code-quality-ci: flowcheck-ci lint-ci
+
+flowcheck-ci: bootstrap-flowcheck
+	$(MAKE) flow
+
+code-quality: flow lint
 
 flow:
-	./node_modules/.bin/flow check --strip-root
+	yarn flow check --strip-root
 
-lint:
-	./node_modules/.bin/eslint scripts $(SOURCES) '*.js' '**/.*.js' --format=codeframe --rulesdir="./scripts/eslint_rules"
+bootstrap-flowcheck: bootstrap-only
+	yarn gulp build-babel-types
+	$(MAKE) build-typings
 
-fix:
-	# The config is hardcoded because otherwise prettier searches for it and also picks up some broken package.json files from tests
-	./node_modules/.bin/prettier --config .prettierrc --write --ignore-path .eslintignore '**/*.json'
-	./node_modules/.bin/eslint scripts $(SOURCES) '*.js' '**/.*.js' --format=codeframe --fix --rulesdir="./scripts/eslint_rules"
+lint-ci: lint-js-ci lint-ts-ci
+
+lint-js-ci: bootstrap-only
+	$(MAKE) lint-js
+
+lint-ts-ci: bootstrap-flowcheck
+	$(MAKE) lint-ts
+
+lint: lint-js lint-ts
+
+lint-js:
+	yarn eslint scripts $(SOURCES) '*.js' --format=codeframe
+
+lint-ts:
+	scripts/lint-ts-typings.sh
+
+fix: fix-json fix-js
+
+fix-js:
+	yarn eslint scripts $(SOURCES) '*.js' --format=codeframe --fix
+
+fix-json:
+	yarn prettier "{$(COMMA_SEPARATED_SOURCES)}/*/test/fixtures/**/options.json" --write --loglevel warn
 
 clean: test-clean
+	rm -f .npmrc
 	rm -rf packages/babel-polyfill/browser*
 	rm -rf packages/babel-polyfill/dist
 	rm -rf coverage
@@ -66,79 +133,165 @@ test-clean:
 	$(foreach source, $(SOURCES), \
 		$(call clean-source-test, $(source)))
 
+# Does not work on Windows; use "yarn jest" instead
 test-only:
 	BABEL_ENV=test ./scripts/test.sh
-	make test-clean
+	YARN jest
+#$(MAKE) test-clean
 
 test: lint test-only
 
-test-ci: bootstrap test-only
+test-ci: jest-ci
 
+jest-ci: build-standalone-ci
+	BABEL_ENV=test yarn jest --maxWorkers=4 --ci
+	$(MAKE) test-clean
+
+# Does not work on Windows
 test-ci-coverage: SHELL:=/bin/bash
 test-ci-coverage:
-	BABEL_COVERAGE=true BABEL_ENV=test make bootstrap
+	BABEL_COVERAGE=true BABEL_ENV=test $(MAKE) bootstrap
 	BABEL_ENV=test TEST_TYPE=cov ./scripts/test-cov.sh
 	bash <(curl -s https://codecov.io/bash) -f coverage/coverage-final.json
 
 bootstrap-flow:
-	rm -rf ./build/flow
-	mkdir -p ./build
-	git clone --branch=master --single-branch --shallow-since=2017-01-01 https://github.com/facebook/flow.git ./build/flow
+	rm -rf build/flow
+	mkdir -p build
+	git clone --branch=master --single-branch --shallow-since=2018-11-01 https://github.com/facebook/flow.git build/flow
 	cd build/flow && git checkout $(FLOW_COMMIT)
 
 test-flow:
-	node scripts/tests/flow/run_babylon_flow_tests.js
+	node scripts/parser-tests/flow
 
-test-flow-ci: bootstrap test-flow
+test-flow-ci: build-bundle-ci bootstrap-flow
+	$(MAKE) test-flow
 
 test-flow-update-whitelist:
-	node scripts/tests/flow/run_babylon_flow_tests.js --update-whitelist
+	node scripts/parser-tests/flow --update-whitelist
+
+bootstrap-typescript:
+	rm -rf ./build/typescript
+	mkdir -p ./build
+	git clone --branch=master --single-branch --shallow-since=2019-09-01 https://github.com/microsoft/TypeScript.git ./build/typescript
+	cd build/typescript && git checkout $(TYPESCRIPT_COMMIT)
+
+test-typescript:
+	node scripts/parser-tests/typescript
+
+test-typescript-ci: build-bundle-ci bootstrap-typescript
+	$(MAKE) test-typescript
+
+test-typescript-update-whitelist:
+	node scripts/parser-tests/typescript --update-whitelist
 
 bootstrap-test262:
-	rm -rf ./build/test262
-	mkdir -p ./build
-	git clone --branch=master --single-branch --shallow-since=2017-01-01 https://github.com/tc39/test262.git ./build/test262
+	rm -rf build/test262
+	mkdir -p build
+	git clone --branch=master --single-branch --shallow-since=2019-12-01 https://github.com/tc39/test262.git build/test262
 	cd build/test262 && git checkout $(TEST262_COMMIT)
 
 test-test262:
-	node scripts/tests/test262/run_babylon_test262.js
+	node scripts/parser-tests/test262
 
-test-test262-ci: bootstrap test-test262
+test-test262-ci: build-bundle-ci bootstrap-test262
+	$(MAKE) test-test262
 
 test-test262-update-whitelist:
-	node scripts/tests/test262/run_babylon_test262.js --update-whitelist
+	node scripts/parser-tests/test262 --update-whitelist
 
-publish:
+# Does not work on Windows
+clone-license:
+	./scripts/clone-license.sh
+
+prepublish-build: clean-lib clean-runtime-helpers
+	NODE_ENV=production BABEL_ENV=production $(MAKE) build
+	$(MAKE) clone-license
+
+prepublish:
+	$(MAKE) bootstrap-only
+	$(MAKE) prepublish-build
+	#$(MAKE) test #fuck your tests babel...
+
+new-version:
 	git pull --rebase
-	make clean-lib
-	rm -rf packages/babel-runtime/helpers
-	rm -rf packages/babel-runtime/core-js
-	BABEL_ENV=production make build-dist
-	make test
-	# not using lerna independent mode atm, so only update packages that have changed since we use ^
-	# --only-explicit-updates
-	./node_modules/.bin/lerna publish --force-publish=* --exact --skip-temp-tag
-	make clean
+	yarn lerna version --force-publish=$(FORCE_PUBLISH)
 
-bootstrap: clean-all
+version-cerxes:
+	yarn lerna version prerelease --allow-branch initializers-fix --preid csx
+
+publish-cerxes: prepublish
+    yarn lerna publish --registry="https://npm.cerxes.net" --force-publish --allow-branch initializer-fix-v7.8.3 --dist-tag csx --skip-git --exact
+
+# NOTE: Run make new-version first
+publish: prepublish
+	yarn lerna publish from-git
+	$(MAKE) clean
+
+publish-ci: prepublish
+ifneq ("$(NPM_TOKEN)", "")
+	echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" > .npmrc
+else
+	echo "Missing NPM_TOKEN env var"
+	exit 1
+endif
+	yarn lerna publish from-git --yes
+	rm -f .npmrc
+	$(MAKE) clean
+
+publish-test:
+ifneq ("$(I_AM_USING_VERDACCIO)", "I_AM_SURE")
+	echo "You probably don't know what you are doing"
+	exit 1
+endif
+	$(MAKE) prepublish-build
+	yarn lerna version patch --force-publish=$(FORCE_PUBLISH)  --no-push --yes --tag-version-prefix="version-e2e-test-"
+	yarn lerna publish from-git --registry http://localhost:4873 --yes --tag-version-prefix="version-e2e-test-"
+	$(MAKE) clean
+
+publish-eslint:
+	$(call set-json-field, ./eslint/$(PKG)/package.json, private, false)
+	cd eslint/$(PKG); yarn publish
+	$(call set-json-field, ./eslint/$(PKG)/package.json, private, true)
+
+bootstrap-only: lerna-bootstrap
+
+yarn-install: clean-all
 	yarn --ignore-engines
-	./node_modules/.bin/lerna bootstrap -- --ignore-engines
-	make build
-	cd packages/babel-runtime; \
-	node scripts/build-dist.js
+
+lerna-bootstrap: yarn-install
+# todo: remove `-- -- --ignore-engines` in Babel 8
+	yarn lerna bootstrap -- -- --ignore-engines
+
+bootstrap: bootstrap-only
+	$(MAKE) build
 
 clean-lib:
+	# TODO: Don't delete eslint/*/lib when they use src
 	$(foreach source, $(SOURCES), \
-		$(call clean-source-lib, $(source)))
+		$(if $(filter-out $(source), eslint), \
+			$(call clean-source-lib, $(source))))
+
+clean-runtime-helpers:
+	rm -f packages/babel-runtime/helpers/**/*.js
+	rm -f packages/babel-runtime-corejs2/helpers/**/*.js
+	rm -f packages/babel-runtime-corejs3/helpers/**/*.js
+	rm -rf packages/babel-runtime-corejs2/core-js
 
 clean-all:
 	rm -rf node_modules
 	rm -rf package-lock.json
+	rm -rf .changelog
 
 	$(foreach source, $(SOURCES), \
 		$(call clean-source-all, $(source)))
 
-	make clean
+	$(MAKE) clean
+
+update-env-corejs-fixture:
+	rm -rf packages/babel-preset-env/node_modules/core-js-compat
+	$(YARN) lerna bootstrap
+	$(MAKE) build-bundle
+	OVERWRITE=true $(YARN) jest packages/babel-preset-env
 
 define clean-source-lib
 	rm -rf $(1)/*/lib
@@ -152,8 +305,16 @@ define clean-source-test
 endef
 
 define clean-source-all
-	rm -rf $(1)/*/lib
+	# TODO: Don't delete eslint/*/lib when they use src
+	$(if $(filter-out $1, eslint), $(call clean-source-lib, $1))
 	rm -rf $(1)/*/node_modules
 	rm -rf $(1)/*/package-lock.json
 
 endef
+
+define set-json-field
+	node -e "\
+		require('fs').writeFileSync('$1'.trim(), \
+			JSON.stringify({ ...require('$1'.trim()), $2: $3 }, null, 2) + '\\n' \
+		)"
+endef

README.md

@@ -9,11 +9,15 @@
 </p>
 
 <p align="center">
-  <a href="https://travis-ci.org/babel/babel"><img alt="Travis Status" src="https://img.shields.io/travis/babel/babel/master.svg?label=travis&maxAge=43200"></a>
+    <a href="https://www.npmjs.com/package/@babel/core"><img alt="v7 npm Downloads" src="https://img.shields.io/npm/dm/@babel/core.svg?maxAge=43200&label=v7%20downloads"></a>
+  <a href="https://www.npmjs.com/package/babel-core"><img alt="v6 npm Downloads" src="https://img.shields.io/npm/dm/babel-core.svg?maxAge=43200&label=v6%20downloads"></a>
+</p>
+<p align="center">
+  <a href="https://travis-ci.com/babel/babel"><img alt="Travis Status" src="https://img.shields.io/travis/com/babel/babel/master.svg?label=travis&maxAge=43200"></a>
   <a href="https://circleci.com/gh/babel/babel"><img alt="CircleCI Status" src="https://img.shields.io/circleci/project/github/babel/babel/master.svg?label=circle&maxAge=43200"></a>
   <a href="https://codecov.io/github/babel/babel"><img alt="Coverage Status" src="https://img.shields.io/codecov/c/github/babel/babel/master.svg?maxAge=43200"></a>
   <a href="https://slack.babeljs.io/"><img alt="Slack Status" src="https://slack.babeljs.io/badge.svg"></a>
-  <a href="https://www.npmjs.com/package/babel-core"><img alt="npm Downloads" src="https://img.shields.io/npm/dm/babel-core.svg?maxAge=43200"></a>
+  <a href="https://twitter.com/intent/follow?screen_name=babeljs"><img alt="Follow on Twitter" src="https://img.shields.io/twitter/follow/babeljs.svg?style=social&label=Follow"></a>
 </p>
 
 <h2 align="center">Supporting Babel</h2>
@@ -24,10 +28,30 @@
   <a href="https://medium.com/friendship-dot-js/i-peeked-into-my-node-modules-directory-and-you-wont-believe-what-happened-next-b89f63d21558"><img alt="Business Strategy Status" src="https://img.shields.io/badge/business%20model-flavortown-green.svg"></a>
 </p>
 
-Babel is community-driven and thus mostly maintained by a group of [volunteers](https://babeljs.io/team). It has a lot of [companies and projects](https://babeljs.io/users) using it but almost no sponsors/people funded to work on it. If you'd like to help maintain the future of the project, please consider:
+Babel (pronounced ["babble"](https://soundcloud.com/sebmck/how-to-pronounce-babel))  is a community-driven project used by many companies and projects, and is maintained by a group of [volunteers](https://babeljs.io/team). If you'd like to help support the future of the project, please consider:
 
-- Giving developer time on the project. (Message us on [Twitter](https://twitter.com/babeljs) or [Slack](https://slack.babeljs.io/))
-- [Giving funds by becoming a backer/sponsor on OpenCollective](https://opencollective.com/babel)
+- Giving developer time on the project. (Message us on [Twitter](https://twitter.com/babeljs) or [Slack](https://slack.babeljs.io/) for guidance!)
+- Giving funds by becoming a sponsor on [Open Collective](https://opencollective.com/babel) or [Patreon](https://www.patreon.com/henryzhu)!
+
+## Sponsors
+
+Our top sponsors are shown below! [[Become a sponsor](https://opencollective.com/babel#sponsor)]
+
+<a href="https://opencollective.com/babel/sponsor/0/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/0/avatar.svg"></a>
+<a href="https://opencollective.com/babel/sponsor/1/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/1/avatar.svg"></a>
+<a href="https://opencollective.com/babel/sponsor/2/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/2/avatar.svg"></a>
+<a href="https://opencollective.com/babel/sponsor/3/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/3/avatar.svg"></a>
+<a href="https://opencollective.com/babel/sponsor/4/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/4/avatar.svg"></a>
+ <a href="https://opencollective.com/babel/sponsor/5/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/5/avatar.svg"></a>
+  <a href="https://opencollective.com/babel/sponsor/6/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/6/avatar.svg"></a>
+  <a href="https://opencollective.com/babel/sponsor/7/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/7/avatar.svg"></a>
+  <a href="https://opencollective.com/babel/sponsor/8/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/8/avatar.svg"></a>
+  <a href="https://opencollective.com/babel/sponsor/9/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/9/avatar.svg"></a>
+  <a href="https://opencollective.com/babel/sponsor/10/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/10/avatar.svg"></a>
+  <a href="https://opencollective.com/babel/sponsor/11/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/11/avatar.svg"></a>
+  <a href="https://opencollective.com/babel/sponsor/12/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/12/avatar.svg"></a>
+  <a href="https://opencollective.com/babel/sponsor/13/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/13/avatar.svg"></a>
+  <a href="https://opencollective.com/babel/sponsor/14/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/14/avatar.svg"></a>
 
 ## Intro
 
@@ -50,24 +74,19 @@ Babel is a tool that helps you write code in the latest version of JavaScript. W
 
 Try it out at our [REPL](https://babeljs.io/repl/build/master#?code_lz=NoRgNATGDMC6B0BbAhgBwBQDsAEBeAfNjgNTYgCUA3EA&lineWrap=true&presets=es2015%2Ces2016%2Ces2017&version=7.0.0-beta.2).
 
-- [FAQ](#faq)
-- [Backers](#backers)
-- [Sponsors](#sponsors)
-- [License](#license)
-
 ## FAQ
 
 ### Who maintains Babel?
 
-Mostly a handful of volunteers! Please check out our [team page](https://babeljs.io/team)!
-
-### Looking for support?
-
-For questions and support please visit join our [Slack Community](https://slack.babeljs.io/), ask a question on [Stack Overflow](https://stackoverflow.com/questions/tagged/babeljs), or ping us on [Twitter](https://twitter.com/babeljs).
+Mostly a handful of volunteers, funded by you! Please check out our [team page](https://babeljs.io/team)!
 
 ### Is there a Babel song?
 
-I'm so glad you asked: [Hallelujah —— In Praise of Babel](SONG.md) by [@angus-c](https://github.com/angus-c). Tweet us your recordings!
+I'm so glad you asked: [Hallelujah —— In Praise of Babel](SONG.md) by [@angus-c](https://github.com/angus-c), [audio version](https://youtu.be/40abpedBKK8) by [@swyx](https://twitter.com/@swyx). Tweet us your recordings!
+
+### Looking for support?
+
+For questions and support please join our [Slack Community](https://slack.babeljs.io/) (you can sign-up [here](https://slack.babeljs.io/) for an invite), ask a question on [Stack Overflow](https://stackoverflow.com/questions/tagged/babeljs), or ping us on [Twitter](https://twitter.com/babeljs).
 
 ### Where are the docs?
 
@@ -79,87 +98,24 @@ Please read through our [CONTRIBUTING.md](CONTRIBUTING.md) and fill out the issu
 
 ### Want to contribute to Babel?
 
-Check out our [CONTRIBUTING.md](CONTRIBUTING.md) to get started with setting up the repo.
+Check out:
 
-- If you have already joined Slack, join our [#development](https://babeljs.slack.com/messages/development) channel and say hi!
-- Check out the issues with the [good first issue](https://github.com/babel/babel/labels/good%20first%20issue) and [help wanted](https://github.com/babel/babel/labels/help%20wanted) label. We suggest also looking at the closed ones to get a sense of the kinds of issues you can tackle.
+- Our [#development](https://babeljs.slack.com/messages/development) Slack channel and say hi ([signup](https://slack.babeljs.io))!
+- Issues with the [good first issue](https://github.com/babel/babel/labels/good%20first%20issue) and [help wanted](https://github.com/babel/babel/labels/help%20wanted) label. We suggest also looking at the [closed ones](https://github.com/babel/babel/issues?utf8=%E2%9C%93&q=is%3Aclosed+label%3A%22good+first+issue%22) to get a sense of the kinds of issues you can tackle.
+
+Some resources:
+
+- Our [CONTRIBUTING.md](CONTRIBUTING.md) to get started with setting up the repo.
 - Our discussions/notes/roadmap: [babel/notes](https://github.com/babel/notes)
 - Our progress on TC39 proposals: [babel/proposals](https://github.com/babel/proposals)
+- Our blog which contains release posts and explanations: [/blog](https://babeljs.io/blog)
+- Our videos page with talks about open source and Babel: [/videos](https://babeljs.io/videos)
+- Our [podcast](https://podcast.babeljs.io)
 
 ### How is the repo structured?
 
 The Babel repo is managed as a [monorepo](doc/design/monorepo.md) that is composed of many [npm packages](packages/README.md).
 
-## Backers
-
-Support us with a monthly donation and help us continue our activities. [[Become a backer](https://opencollective.com/babel#backer)]
-
-<a href="https://opencollective.com/babel/backer/0/website" target="_blank"><img src="https://opencollective.com/babel/backer/0/avatar.svg"></a>
-<a href="https://opencollective.com/babel/backer/1/website" target="_blank"><img src="https://opencollective.com/babel/backer/1/avatar.svg"></a>
-<a href="https://opencollective.com/babel/backer/2/website" target="_blank"><img src="https://opencollective.com/babel/backer/2/avatar.svg"></a>
-<a href="https://opencollective.com/babel/backer/3/website" target="_blank"><img src="https://opencollective.com/babel/backer/3/avatar.svg"></a>
-<a href="https://opencollective.com/babel/backer/4/website" target="_blank"><img src="https://opencollective.com/babel/backer/4/avatar.svg"></a>
-<a href="https://opencollective.com/babel/backer/5/website" target="_blank"><img src="https://opencollective.com/babel/backer/5/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/6/website" target="_blank"><img src="https://opencollective.com/babel/backer/6/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/7/website" target="_blank"><img src="https://opencollective.com/babel/backer/7/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/8/website" target="_blank"><img src="https://opencollective.com/babel/backer/8/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/9/website" target="_blank"><img src="https://opencollective.com/babel/backer/9/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/10/website" target="_blank"><img src="https://opencollective.com/babel/backer/10/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/11/website" target="_blank"><img src="https://opencollective.com/babel/backer/11/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/12/website" target="_blank"><img src="https://opencollective.com/babel/backer/12/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/13/website" target="_blank"><img src="https://opencollective.com/babel/backer/13/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/14/website" target="_blank"><img src="https://opencollective.com/babel/backer/14/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/15/website" target="_blank"><img src="https://opencollective.com/babel/backer/15/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/16/website" target="_blank"><img src="https://opencollective.com/babel/backer/16/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/17/website" target="_blank"><img src="https://opencollective.com/babel/backer/17/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/18/website" target="_blank"><img src="https://opencollective.com/babel/backer/18/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/19/website" target="_blank"><img src="https://opencollective.com/babel/backer/19/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/20/website" target="_blank"><img src="https://opencollective.com/babel/backer/20/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/21/website" target="_blank"><img src="https://opencollective.com/babel/backer/21/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/22/website" target="_blank"><img src="https://opencollective.com/babel/backer/22/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/23/website" target="_blank"><img src="https://opencollective.com/babel/backer/23/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/24/website" target="_blank"><img src="https://opencollective.com/babel/backer/24/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/25/website" target="_blank"><img src="https://opencollective.com/babel/backer/25/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/26/website" target="_blank"><img src="https://opencollective.com/babel/backer/26/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/27/website" target="_blank"><img src="https://opencollective.com/babel/backer/27/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/28/website" target="_blank"><img src="https://opencollective.com/babel/backer/28/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/backer/29/website" target="_blank"><img src="https://opencollective.com/babel/backer/29/avatar.svg"></a>
-
-## Sponsors
-
-Become a sponsor and get your logo on our README on Github with a link to your site. [[Become a sponsor](https://opencollective.com/babel#sponsor)]
-
-<a href="https://opencollective.com/babel/sponsor/0/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/0/avatar.svg"></a>
-<a href="https://opencollective.com/babel/sponsor/1/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/1/avatar.svg"></a>
-<a href="https://opencollective.com/babel/sponsor/2/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/2/avatar.svg"></a>
-<a href="https://opencollective.com/babel/sponsor/3/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/3/avatar.svg"></a>
-<a href="https://opencollective.com/babel/sponsor/4/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/4/avatar.svg"></a>
- <a href="https://opencollective.com/babel/sponsor/5/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/5/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/6/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/6/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/7/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/7/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/8/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/8/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/9/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/9/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/10/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/10/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/11/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/11/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/12/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/12/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/13/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/13/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/14/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/14/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/15/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/15/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/16/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/16/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/17/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/17/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/18/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/18/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/19/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/19/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/20/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/20/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/21/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/21/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/22/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/22/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/23/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/23/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/24/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/24/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/25/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/25/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/26/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/26/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/27/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/27/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/28/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/28/avatar.svg"></a>
-  <a href="https://opencollective.com/babel/sponsor/29/website" target="_blank"><img src="https://opencollective.com/babel/sponsor/29/avatar.svg"></a>
-
 ## License
 
 [MIT](LICENSE)

SECURITY.md

@@ -0,0 +1,19 @@
+# Security Policy
+
+## Supported Versions
+
+This is the list of versions of `babel` which are
+currently being supported with security updates.
+
+| Version  | Supported          |
+| -------- | ------------------ |
+| 7.x      | :white_check_mark: |
+| 6.26.x   | :white_check_mark: |
+| < 6.26.0 | :x:                |
+
+## Reporting a Vulnerability
+
+To report a vulnerability please send an email with the details to security@babeljs.io. 
+This will help us to assess the risk and start the necessary steps.
+
+Thanks for helping to keep babel secure.

SONG.md

@@ -1,5 +1,7 @@
 ## Hallelujah—In Praise of Babel
 
+➤ [🎶 Audio version here!](https://youtu.be/40abpedBKK8)
+
 I heard there was a clever trick  
 That rewrote all your JavaScript  
 But you don’t really care for magic, do you  
@@ -17,7 +19,8 @@ Generators, const and let
 I used them all without regret  
 And it’s a terse and a destructured Hallelujah  
 
-Hallelujah etc.
+Hallelujah, Hallelujah  
+Hallelujah, Hallelujah
 
 Well my faith was strong but I needed proof  
 The standard was my source of truth  
@@ -26,7 +29,9 @@ So even though you weren’t impressed
 I checked the build against the spec  
 And it’s a more-or-less compliant Hallelujah  
 
-Hallelujah etc.
+
+Hallelujah, Hallelujah  
+Hallelujah, Hallelujah
 
 Now you say the build step’s too complex  
 And you claim no need for ES Next  
@@ -35,7 +40,9 @@ But your code grows older with each line
 It’s a joyless dirge on a withered vine  
 It’s a threnody for a bygone Hallelujah  
 
-Hallelujah etc.
+
+Hallelujah, Hallelujah  
+Hallelujah, Hallelujah
 
 Yes I learned about the danger signs  
 How they’d polyfilled a thousand lines  
@@ -44,7 +51,9 @@ Still I disregarded common sense
 Now my source is small but the build’s immense  
 And it’s a slow and unresponsive Hallelujah  
 
-Hallelujah etc.
+
+Hallelujah, Hallelujah  
+Hallelujah, Hallelujah
 
 There was a time when they let me know  
 What’s really going on below  
@@ -53,7 +62,9 @@ And debugging’s not a progress march
 It’s a frenzied fumble in the dark  
 It’s a labyrinthine search for Hallelujah  
 
-Hallelujah etc.
+
+Hallelujah, Hallelujah  
+Hallelujah, Hallelujah
 
 Well, maybe there’s a god up there  
 But all I ever got from prayers  
@@ -62,6 +73,8 @@ And that anguished cry you hear at night
 Is the plugin I forgot to write  
 It’s a cold and it’s a broken Hallelujah  
 
-Hallelujah etc.
+
+Hallelujah, Hallelujah  
+Hallelujah, Hallelujah
 
 [Angus Croll](https://github.com/angus-c)  

babel.config.js

@@ -0,0 +1,154 @@
+"use strict";
+
+module.exports = function(api) {
+  const env = api.env();
+
+  const includeCoverage = process.env.BABEL_COVERAGE === "true";
+
+  const envOptsNoTargets = {
+    loose: true,
+    modules: false,
+    exclude: ["transform-typeof-symbol"],
+  };
+  const envOpts = Object.assign({}, envOptsNoTargets);
+
+  let convertESM = true;
+  let ignoreLib = true;
+  let includeRegeneratorRuntime = false;
+
+  let transformRuntimeOptions;
+
+  const nodeVersion = "6.9";
+  // The vast majority of our src files are modules, but we use
+  // unambiguous to keep things simple until we get around to renaming
+  // the modules to be more easily distinguished from CommonJS
+  const unambiguousSources = [
+    "packages/*/src",
+    "packages/*/test",
+    "codemods/*/src",
+    "codemods/*/test",
+    "eslint/*/src",
+    "eslint/*/test",
+  ];
+
+  switch (env) {
+    // Configs used during bundling builds.
+    case "standalone":
+      includeRegeneratorRuntime = true;
+      unambiguousSources.push("packages/babel-runtime/regenerator");
+    case "rollup":
+      convertESM = false;
+      ignoreLib = false;
+      // rollup-commonjs will converts node_modules to ESM
+      unambiguousSources.push(
+        "**/node_modules",
+        "packages/babel-preset-env/data",
+        "packages/babel-compat-data"
+      );
+      if (env === "rollup") envOpts.targets = { node: nodeVersion };
+      break;
+    case "production":
+      // Config during builds before publish.
+      envOpts.targets = {
+        node: nodeVersion,
+      };
+      break;
+    case "development":
+      envOpts.debug = true;
+      envOpts.targets = {
+        node: "current",
+      };
+      break;
+    case "test":
+      envOpts.targets = {
+        node: "current",
+      };
+      break;
+  }
+
+  if (includeRegeneratorRuntime) {
+    const babelRuntimePkgPath = require.resolve("@babel/runtime/package.json");
+
+    transformRuntimeOptions = {
+      helpers: false, // Helpers are handled by rollup when needed
+      regenerator: true,
+      version: require(babelRuntimePkgPath).version,
+    };
+  }
+
+  const config = {
+    // Our dependencies are all standard CommonJS, along with all sorts of
+    // other random files in Babel's codebase, so we use script as the default,
+    // and then mark actual modules as modules farther down.
+    sourceType: "script",
+    comments: false,
+    ignore: [
+      // These may not be strictly necessary with the newly-limited scope of
+      // babelrc searching, but including them for now because we had them
+      // in our .babelignore before.
+      "packages/*/test/fixtures",
+      ignoreLib ? "packages/*/lib" : null,
+      "packages/babel-standalone/babel.js",
+      "packages/babel-preset-env-standalone/babel-preset-env.js",
+    ].filter(Boolean),
+    presets: [["@babel/env", envOpts]],
+    plugins: [
+      // TODO: Use @babel/preset-flow when
+      // https://github.com/babel/babel/issues/7233 is fixed
+      "@babel/plugin-transform-flow-strip-types",
+      ["@babel/proposal-class-properties", { loose: true }],
+      "@babel/proposal-export-namespace-from",
+      "@babel/proposal-numeric-separator",
+      [
+        "@babel/proposal-object-rest-spread",
+        { useBuiltIns: true, loose: true },
+      ],
+      ["@babel/plugin-proposal-optional-chaining", { loose: true }],
+      ["@babel/plugin-proposal-nullish-coalescing-operator", { loose: true }],
+
+      convertESM ? "@babel/transform-modules-commonjs" : null,
+      // Until Jest supports native mjs, we must simulate it 🤷
+      env === "test" || env === "development"
+        ? "@babel/plugin-proposal-dynamic-import"
+        : null,
+    ].filter(Boolean),
+    overrides: [
+      {
+        test: "packages/babel-parser",
+        plugins: [
+          "babel-plugin-transform-charcodes",
+          ["@babel/transform-for-of", { assumeArray: true }],
+        ],
+      },
+      {
+        test: ["./packages/babel-cli", "./packages/babel-core"],
+        plugins: [
+          // Explicitly use the lazy version of CommonJS modules.
+          convertESM
+            ? ["@babel/transform-modules-commonjs", { lazy: true }]
+            : null,
+        ].filter(Boolean),
+      },
+      {
+        test: "./packages/babel-polyfill",
+        presets: [["@babel/env", envOptsNoTargets]],
+      },
+      {
+        test: unambiguousSources,
+        sourceType: "unambiguous",
+      },
+      includeRegeneratorRuntime && {
+        exclude: /regenerator-runtime/,
+        plugins: [["@babel/transform-runtime", transformRuntimeOptions]],
+      },
+    ].filter(Boolean),
+  };
+
+  // we need to do this as long as we do not test everything from source
+  if (includeCoverage) {
+    config.auxiliaryCommentBefore = "istanbul ignore next";
+    config.plugins.push("babel-plugin-istanbul");
+  }
+
+  return config;
+};

codecov.yml

@@ -5,6 +5,8 @@ coverage:
   status:
     project:
       default:
-        target: "80%"
+        target: "90%"
     patch:
       enabled: false
+ignore:
+  - packages/babel-types/src/*/generated/index.js

codemods/babel-plugin-codemod-object-assign-to-object-spread/README.md

@@ -0,0 +1,57 @@
+# @babel/plugin-codemod-object-assign-to-object-spread
+
+Transforms old code that uses `Object.assign` with an Object Literal as
+the first param to use Object Spread syntax.
+
+## Examples
+
+```js
+const obj = Object.assign({
+  test1: 1,
+}, other, {
+  test2: 2,
+}, other2);
+```
+
+Is transformed to:
+
+```js
+const obj = {
+  test1: 1,
+  ...other,
+  test2: 2,
+  ...other2,
+};
+```
+
+## Installation
+
+```sh
+npm install --save-dev @babel/plugin-codemod-object-assign-to-object-spread
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```jsonc
+{
+  "plugins": ["@babel/plugin-codemod-object-assign-to-object-spread"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins @babel/plugin-codemod-object-assign-to-object-spread script.js
+```
+
+### Via Node API
+
+```javascript
+require("@babel/core").transform("code", {
+  plugins: ["@babel/plugin-codemod-object-assign-to-object-spread"]
+});
+```

codemods/babel-plugin-codemod-object-assign-to-object-spread/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "@babel/plugin-codemod-object-assign-to-object-spread",
+  "version": "7.7.4",
+  "description": "Transforms Object.assign into object spread syntax",
+  "repository": "https://github.com/babel/babel/tree/master/codemods/babel-plugin-codemod-object-assign-to-object-spread",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "main": "lib/index.js",
+  "keywords": [
+    "@babel/codemod",
+    "@babel/plugin"
+  ],
+  "dependencies": {
+    "@babel/plugin-syntax-object-rest-spread": "^7.7.4"
+  },
+  "peerDependencies": {
+    "@babel/core": "^7.0.0-0 || csx"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.7.4",
+    "@babel/helper-plugin-test-runner": "^7.7.4"
+  }
+}

codemods/babel-plugin-codemod-object-assign-to-object-spread/src/index.js

@@ -0,0 +1,35 @@
+import syntaxObjectRestSpread from "@babel/plugin-syntax-object-rest-spread";
+
+export default function({ types: t }) {
+  return {
+    inherits: syntaxObjectRestSpread,
+
+    visitor: {
+      CallExpression(path) {
+        if (!path.get("callee").matchesPattern("Object.assign")) return;
+
+        const args = path.get("arguments");
+        if (args.length === 0) return;
+
+        const [objPath] = args;
+        if (!objPath.isObjectExpression()) return;
+
+        const obj = objPath.node;
+        const { properties } = obj;
+
+        for (let i = 1; i < args.length; i++) {
+          const arg = args[i];
+          const { node } = arg;
+
+          if (arg.isObjectExpression()) {
+            properties.push(...node.properties);
+          } else {
+            properties.push(t.spreadElement(node));
+          }
+        }
+
+        path.replaceWith(obj);
+      },
+    },
+  };
+}

codemods/babel-plugin-codemod-object-assign-to-object-spread/test/fixtures/object-assign-to-object-spread/multiple-objects/input.js

@@ -0,0 +1 @@
+Object.assign({test: 1}, {test: 2});

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

@@ -0,0 +1,3 @@
+{
+  "plugins": ["../../../../lib"]
+}

codemods/babel-plugin-codemod-object-assign-to-object-spread/test/fixtures/object-assign-to-object-spread/multiple-objects/output.js

@@ -0,0 +1,4 @@
+({
+  test: 1,
+  test: 2
+});

codemods/babel-plugin-codemod-object-assign-to-object-spread/test/fixtures/object-assign-to-object-spread/multiple/input.js

@@ -0,0 +1 @@
+Object.assign({test: 1}, test2, {test: 2}, test3);

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

@@ -0,0 +1,3 @@
+{
+  "plugins": ["../../../../lib"]
+}

codemods/babel-plugin-codemod-object-assign-to-object-spread/test/fixtures/object-assign-to-object-spread/multiple/output.js

@@ -0,0 +1,6 @@
+({
+  test: 1,
+  ...test2,
+  test: 2,
+  ...test3
+});

codemods/babel-plugin-codemod-object-assign-to-object-spread/test/fixtures/object-assign-to-object-spread/single-non-object/input.js

@@ -0,0 +1 @@
+Object.assign(test);

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

@@ -0,0 +1,3 @@
+{
+  "plugins": ["../../../../lib"]
+}

codemods/babel-plugin-codemod-object-assign-to-object-spread/test/fixtures/object-assign-to-object-spread/single-non-object/output.js

@@ -0,0 +1 @@
+Object.assign(test);

codemods/babel-plugin-codemod-object-assign-to-object-spread/test/fixtures/object-assign-to-object-spread/single/input.js

@@ -0,0 +1 @@
+Object.assign({test: 1});

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

@@ -0,0 +1,3 @@
+{
+  "plugins": ["../../../../lib"]
+}

codemods/babel-plugin-codemod-object-assign-to-object-spread/test/fixtures/object-assign-to-object-spread/single/output.js

@@ -0,0 +1,3 @@
+({
+  test: 1
+});

codemods/babel-plugin-codemod-optional-catch-binding/README.md

@@ -34,7 +34,7 @@ npm install --save-dev @babel/plugin-codemod-optional-catch-binding
 
 **.babelrc**
 
-```json
+```jsonc
 {
   "plugins": ["@babel/plugin-codemod-optional-catch-binding"]
 }

codemods/babel-plugin-codemod-optional-catch-binding/package.json

@@ -1,21 +1,25 @@
 {
   "name": "@babel/plugin-codemod-optional-catch-binding",
-  "version": "7.0.0-beta.44",
+  "version": "7.7.4",
   "description": "Remove unused catch bindings",
-  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-remove-unused-catch-binding",
+  "repository": "https://github.com/babel/babel/tree/master/codemods/babel-plugin-codemod-remove-unused-catch-binding",
   "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
   "main": "lib/index.js",
   "keywords": [
+    "@babel/codemod",
     "@babel/plugin"
   ],
   "dependencies": {
-    "@babel/plugin-syntax-optional-catch-binding": "7.0.0-beta.44"
+    "@babel/plugin-syntax-optional-catch-binding": "^7.7.4"
   },
   "peerDependencies": {
-    "@babel/core": "7.0.0-beta.44"
+    "@babel/core": "^7.0.0-0 || csx"
   },
   "devDependencies": {
-    "@babel/core": "7.0.0-beta.44",
-    "@babel/helper-plugin-test-runner": "7.0.0-beta.44"
+    "@babel/core": "^7.7.4",
+    "@babel/helper-plugin-test-runner": "^7.7.4"
   }
 }

codemods/babel-plugin-codemod-optional-catch-binding/src/index.js

@@ -1,7 +1,6 @@
 import syntaxOptionalCatchBinding from "@babel/plugin-syntax-optional-catch-binding";
-import { types as t } from "@babel/core";
 
-export default function() {
+export default function({ types: t }) {
   return {
     inherits: syntaxOptionalCatchBinding,
 

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-block-duplicate-variable-declaration/input.js

@@ -1,5 +0,0 @@
-try {
-  throw 0;
-} catch (e) {
-  let e = new TypeError('Duplicate variable declaration; will throw an error.');
-}

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

@@ -1,4 +0,0 @@
-{
-  "plugins": ["../../../../lib"],
-  "throws": "Duplicate declaration \"e\""
-}

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": ["../../../../lib"]
+}

doc/ast/spec.md

@@ -1 +1 @@
-The [AST specification](https://github.com/babel/babel/blob/master/packages/babylon/ast/spec.md) has been moved to the Babylon package, `packages/babylon`.
+The [AST specification](https://github.com/babel/babel/blob/master/packages/babel-parser/ast/spec.md) has been moved to the babel parser package, `packages/babel-parser`.

doc/design/compiler-environment-support.md

@@ -7,7 +7,7 @@
 The Babel compiler is **only** supported in these environments:
 
  - Modern browsers such as Chrome, Firefox, Safari, Edge etc.
- - Node.js 4 and upper versions
+ - Node.js 6 and newer versions
 
 ## Unsupported environments
 

doc/design/monorepo.md

@@ -15,7 +15,7 @@ This is quite taboo but let's look at the pros and cons:
  * Easy to coordinate changes across modules.
  * Single place to report issues.
  * Easier to setup a development environment.
- * Tests across modules are run together which finds bugs that touch multiple modules easier.
+ * Tests across modules are run together which finds bugs that touch multiple modules more easily.
 
 **Cons:**
 

eslint/babel-eslint-config-internal/.npmignore

@@ -0,0 +1,4 @@
+src
+test
+.*
+*.log

eslint/babel-eslint-config-internal/README.md

@@ -0,0 +1,4 @@
+## @babel/eslint-config-internal
+---
+
+ESLint config for the Babel codebase (originally taken from `eslint-config-kittens`)

eslint/babel-eslint-config-internal/index.js

@@ -0,0 +1,49 @@
+"use strict";
+
+module.exports = {
+  parser: "babel-eslint",
+  extends: "eslint:recommended",
+  plugins: ["flowtype"],
+  parserOptions: {
+    ecmaVersion: 2020,
+    sourceType: "module",
+  },
+  globals: {
+    // Flow
+    Iterator: true,
+    $Keys: true,
+  },
+  env: {
+    node: true,
+    es2020: true,
+    browser: true,
+  },
+  rules: {
+    camelcase: "off",
+    "consistent-return": "off",
+    curly: ["error", "multi-line"],
+    "linebreak-style": ["error", "unix"],
+    "new-cap": "off",
+    "no-case-declarations": "error",
+    "no-cond-assign": "off",
+    "no-confusing-arrow": "error",
+    "no-console": "off",
+    "no-constant-condition": "off",
+    "no-empty": "off",
+    "no-fallthrough": "off",
+    "no-inner-declarations": "off",
+    "no-labels": "off",
+    "no-loop-func": "off",
+    "no-process-exit": "off",
+    "no-return-assign": "off",
+    "no-shadow": "off",
+    "no-underscore-dangle": "off",
+    "no-unreachable": "off",
+    "no-use-before-define": "off",
+    "no-var": "error",
+    "prefer-const": "error",
+    strict: "off",
+    "flowtype/define-flow-type": "warn",
+    "flowtype/use-flow-type": "warn",
+  },
+};

eslint/babel-eslint-config-internal/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "@babel/eslint-config-internal",
+  "version": "7.8.3-csx.2",
+  "description": "The Babel Team's ESLint configuration. Since it's internal, it might not respect semver.",
+  "author": "Sebastian McKenzie <sebmck@gmail.com>",
+  "homepage": "https://babeljs.io/",
+  "license": "MIT",
+  "private": true,
+  "repository": "https://github.com/babel/babel/tree/master/eslint/babel-eslint-config-internal",
+  "main": "lib/index.js",
+  "peerDependencies": {
+    "babel-eslint": "^10.0.0 || ^11.0.0-0",
+    "eslint-plugin-flowtype": "^3.0.0"
+  }
+}

eslint/babel-eslint-parser/.npmignore

@@ -0,0 +1,4 @@
+src
+test
+.*
+*.log

eslint/babel-eslint-parser/README.md

@@ -0,0 +1,124 @@
+# @babel/eslint-parser [![npm](https://img.shields.io/npm/v/@babel/eslint-parser.svg)](https://www.npmjs.com/package/@babel/eslint-parser) [![travis](https://img.shields.io/travis/babel/@babel/eslint-parser/master.svg)](https://travis-ci.org/babel/@babel/eslint-parser) [![npm-downloads](https://img.shields.io/npm/dm/@babel/eslint-parser.svg)](https://www.npmjs.com/package/@babel/eslint-parser)
+
+**@babel/eslint-parser** allows you to lint **ALL** valid Babel code with the fantastic
+[ESLint](https://github.com/eslint/eslint).
+
+## When should I use @babel/eslint-parser?
+
+ESLint's default parser and core rules [only support the latest final ECMAScript standard](https://github.com/eslint/eslint/blob/a675c89573836adaf108a932696b061946abf1e6/README.md#what-about-experimental-features) and do not support experimental (such as new features) and non-standard (such as Flow or TypeScript types) syntax provided by Babel. @babel/eslint-parser is a parser that allows ESLint to run on source code that is transformed by Babel.
+
+**Note:** You only need to use @babel/parser-eslint if you are using Babel to transform your code. If this is not the case, please use the relevant parser for your chosen flavor of ECMAScript (note that the default parser supports all non-experimental syntax as well as JSX).
+
+## How does it work?
+
+ESLint allows for the use of [custom parsers](https://eslint.org/docs/developer-guide/working-with-custom-parsers). When using this plugin, your code is parsed by Babel's parser (using the configuration specified in your [Babel configuration file](https://babeljs.io/docs/en/configuration)) and the resulting AST is
+transformed into an [ESTree](https://github.com/estree/estree)-compliant structure that ESLint can understand. All location info such as line numbers,
+columns is also retained so you can track down errors with ease.
+
+**Note:** ESLint's core rules do not support experimental syntax and may therefore not work as expected when using `@babel/eslint-parser`. Please use the companion [`@babel/eslint-plugin`](https://github.com/babel/babel/tree/master/eslint/babel-eslint-plugin) plugin for core rules that you have issues with.
+
+## Usage
+
+### Installation
+
+```sh
+$ npm install eslint @babel/core @babel/eslint-parser --save-dev
+# or
+$ yarn add eslint @babel/core @babel/eslint-parser -D
+```
+
+**Note:** @babel/eslint-parser requires `@babel/core@>=7.2.0` and a valid Babel configuration file to run. If you do not have this already set up, please see the [Babel Usage Guide](https://babeljs.io/docs/en/usage).
+
+### Setup
+
+To use @babel/eslint-parser, `"@babel/eslint-parser"` must be specified as the `parser` in your ESLint configuration file (see [here](https://eslint.org/docs/user-guide/configuring#specifying-parser) for more detailed information).
+
+**.eslintrc.js**
+
+```js
+module.exports = {
+  parser: "@babel/eslint-parser",
+};
+```
+
+With the parser set, your configuration can be configured as described in the [Configuring ESLint](https://eslint.org/docs/user-guide/configuring) documentation.
+
+**Note:** The `parserOptions` described in the [official documentation](https://eslint.org/docs/user-guide/configuring#specifying-parser-options) are for the default parser and are not necessarily supported by @babel/eslint-parser. Please see the section directly below for supported `parserOptions`.
+
+### Additional parser configuration
+
+Additional configuration options can be set in your ESLint configuration under the `parserOptions` key. Please note that the `ecmaFeatures` config property may still be required for ESLint to work properly with features not in ECMAScript 5 by default.
+
+- `requireConfigFile` (default `true`) can be set to `false` to allow @babel/eslint-parser to run on files that do not have a Babel configuration associated with them. This can be useful for linting files that are not transformed by Babel (such as tooling configuration files), though we recommend using the default parser via [glob-based configuration](https://eslint.org/docs/user-guide/configuring#configuration-based-on-glob-patterns). Note: @babel/eslint-parser will not parse any experimental syntax when no configuration file is found.
+- `sourceType` can be set to `"module"`(default) or `"script"` if your code isn't using ECMAScript modules.
+- `allowImportExportEverywhere` (default `false`) can be set to `true` to allow import and export declarations to appear anywhere a statement is allowed if your build environment supports that. Otherwise import and export declarations can only appear at a program's top level.
+- `ecmaFeatures.globalReturn` (default `false`) allow return statements in the global scope when used with `sourceType: "script"`.
+- `babelOptions` passes through Babel's configuration [loading](https://babeljs.io/docs/en/options#config-loading-options) and [merging](https://babeljs.io/docs/en/options#config-merging-options) options (for instance, in case of a monorepo). When not defined, @babel/eslint-parser will use Babel's default configuration file resolution logic.
+
+**.eslintrc.js**
+
+```js
+module.exports = {
+  parser: "@babel/eslint-parser",
+  parserOptions: {
+    sourceType: "module",
+    allowImportExportEverywhere: false,
+    ecmaFeatures: {
+      globalReturn: false,
+    },
+    babelOptions: {
+      configFile: "path/to/config.js",
+    },
+  },
+};
+```
+
+**.eslintrc.js using glob-based configuration**
+
+This configuration would use the default parser for all files except for those found by the `"files/transformed/by/babel/*.js"` glob.
+
+```js
+module.exports = {
+  rules: {
+    indent: "error"
+  },
+  overrides: [
+    {
+      files: ["files/transformed/by/babel/*.js"],
+      parser: "@babel/eslint-parser",
+    }
+  ]
+};
+```
+
+### Run
+
+```sh
+$ ./node_modules/.bin/eslint yourfile.js
+```
+
+## Known issues
+
+Flow:
+
+> Check out [eslint-plugin-flowtype](https://github.com/gajus/eslint-plugin-flowtype): An `eslint` plugin that makes flow type annotations global variables and marks declarations as used. Solves the problem of false positives with `no-undef` and `no-unused-vars`.
+
+- `no-undef` for global flow types: `ReactElement`, `ReactClass` [#130](https://github.com/babel/@babel/eslint-parser/issues/130#issuecomment-111215076)
+  - Workaround: define types as globals in `.eslintrc` or define types and import them `import type ReactElement from './types'`
+- `no-unused-vars/no-undef` with Flow declarations (`declare module A {}`) [#132](https://github.com/babel/@babel/eslint-parser/issues/132#issuecomment-112815926)
+
+Modules/strict mode
+
+- `no-unused-vars: ["error", { vars: local }]` [#136](https://github.com/babel/@babel/eslint-parser/issues/136)
+
+Please check out [eslint-plugin-react](https://github.com/yannickcr/eslint-plugin-react) for React/JSX issues.
+
+- `no-unused-vars` with jsx
+
+Please check out [eslint-plugin-babel](https://github.com/babel/eslint-plugin-babel) for other issues.
+
+## Questions and support
+
+If you have an issue, please first check if it can be reproduced with the default parser and with the latest versions of `eslint` and `@babel/eslint-parser`. If it is not reproducible with the default parser, it is most likely an issue with `@babel/eslint-parser`.
+
+For questions and support please visit the [`#discussion`](https://babeljs.slack.com/messages/discussion/) Babel Slack channel (sign up [here](https://github.com/babel/notes/issues/38)) or the ESLint [Gitter](https://gitter.im/eslint/eslint).

eslint/babel-eslint-parser/package.json

@@ -0,0 +1,37 @@
+{
+  "name": "@babel/eslint-parser",
+  "version": "7.8.3-csx.2",
+  "description": "ESLint parser that allows for linting of experimental syntax transformed by Babel",
+  "author": "Sebastian McKenzie <sebmck@gmail.com>",
+  "license": "MIT",
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/babel/babel.git",
+    "directory": "eslint/babel-eslint-parser"
+  },
+  "bugs": {
+    "url": "https://github.com/babel/babel/issues"
+  },
+  "homepage": "https://github.com/babel/babel/tree/master/eslint/babel-eslint-parser",
+  "engines": {
+    "node": ">=10.9"
+  },
+  "main": "lib/index.js",
+  "peerDependencies": {
+    "@babel/core": ">=7.2.0",
+    "eslint": ">=6.0.0"
+  },
+  "dependencies": {
+    "eslint-scope": "5.0.0",
+    "eslint-visitor-keys": "^1.1.0",
+    "semver": "^6.3.0"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.2.0",
+    "@babel/eslint-shared-fixtures": "7.8.3-csx.2",
+    "dedent": "^0.7.0",
+    "eslint": "^6.0.1",
+    "espree": "^6.0.0"
+  }
+}

eslint/babel-eslint-parser/src/analyze-scope.js

@@ -0,0 +1,344 @@
+import { types as t } from "@babel/core";
+import escope from "eslint-scope";
+import { Definition } from "eslint-scope/lib/definition";
+import OriginalPatternVisitor from "eslint-scope/lib/pattern-visitor";
+import OriginalReferencer from "eslint-scope/lib/referencer";
+import { getKeys as fallback } from "eslint-visitor-keys";
+import childVisitorKeys from "./visitor-keys";
+
+const flowFlippedAliasKeys = t.FLIPPED_ALIAS_KEYS.Flow.concat([
+  "ArrayPattern",
+  "ClassDeclaration",
+  "ClassExpression",
+  "FunctionDeclaration",
+  "FunctionExpression",
+  "Identifier",
+  "ObjectPattern",
+  "RestElement",
+]);
+
+const visitorKeysMap = Object.entries(t.VISITOR_KEYS).reduce(
+  (acc, [key, value]) => {
+    if (!flowFlippedAliasKeys.includes(value)) {
+      acc[key] = value;
+    }
+    return acc;
+  },
+  {},
+);
+
+const propertyTypes = {
+  // loops
+  callProperties: { type: "loop", values: ["value"] },
+  indexers: { type: "loop", values: ["key", "value"] },
+  properties: { type: "loop", values: ["argument", "value"] },
+  types: { type: "loop" },
+  params: { type: "loop" },
+  // single property
+  argument: { type: "single" },
+  elementType: { type: "single" },
+  qualification: { type: "single" },
+  rest: { type: "single" },
+  returnType: { type: "single" },
+  // others
+  typeAnnotation: { type: "typeAnnotation" },
+  typeParameters: { type: "typeParameters" },
+  id: { type: "id" },
+};
+
+class PatternVisitor extends OriginalPatternVisitor {
+  ArrayPattern(node) {
+    node.elements.forEach(this.visit, this);
+  }
+
+  ObjectPattern(node) {
+    node.properties.forEach(this.visit, this);
+  }
+}
+
+class Referencer extends OriginalReferencer {
+  // inherits.
+  visitPattern(node, options, callback) {
+    if (!node) {
+      return;
+    }
+
+    // Visit type annotations.
+    this._checkIdentifierOrVisit(node.typeAnnotation);
+    if (t.isAssignmentPattern(node)) {
+      this._checkIdentifierOrVisit(node.left.typeAnnotation);
+    }
+
+    // Overwrite `super.visitPattern(node, options, callback)` in order to not visit `ArrayPattern#typeAnnotation` and `ObjectPattern#typeAnnotation`.
+    if (typeof options === "function") {
+      callback = options;
+      options = { processRightHandNodes: false };
+    }
+
+    const visitor = new PatternVisitor(this.options, node, callback);
+    visitor.visit(node);
+
+    // Process the right hand nodes recursively.
+    if (options.processRightHandNodes) {
+      visitor.rightHandNodes.forEach(this.visit, this);
+    }
+  }
+
+  // inherits.
+  visitClass(node) {
+    // Decorators.
+    this._visitArray(node.decorators);
+
+    // Flow type parameters.
+    const typeParamScope = this._nestTypeParamScope(node);
+
+    // Flow super types.
+    this._visitTypeAnnotation(node.implements);
+    this._visitTypeAnnotation(
+      node.superTypeParameters && node.superTypeParameters.params,
+    );
+
+    // Basic.
+    super.visitClass(node);
+
+    // Close the type parameter scope.
+    if (typeParamScope) {
+      this.close(node);
+    }
+  }
+
+  // inherits.
+  visitFunction(node) {
+    const typeParamScope = this._nestTypeParamScope(node);
+
+    // Flow return types.
+    this._checkIdentifierOrVisit(node.returnType);
+
+    // Basic.
+    super.visitFunction(node);
+
+    // Close the type parameter scope.
+    if (typeParamScope) {
+      this.close(node);
+    }
+  }
+
+  // inherits.
+  visitProperty(node) {
+    if (node.value?.type === "TypeCastExpression") {
+      this._visitTypeAnnotation(node.value);
+    }
+    this._visitArray(node.decorators);
+    super.visitProperty(node);
+  }
+
+  InterfaceDeclaration(node) {
+    this._createScopeVariable(node, node.id);
+
+    const typeParamScope = this._nestTypeParamScope(node);
+
+    // TODO: Handle mixins
+    this._visitArray(node.extends);
+    this.visit(node.body);
+
+    if (typeParamScope) {
+      this.close(node);
+    }
+  }
+
+  TypeAlias(node) {
+    this._createScopeVariable(node, node.id);
+
+    const typeParamScope = this._nestTypeParamScope(node);
+
+    this.visit(node.right);
+
+    if (typeParamScope) {
+      this.close(node);
+    }
+  }
+
+  ClassProperty(node) {
+    this._visitClassProperty(node);
+  }
+
+  ClassPrivateProperty(node) {
+    this._visitClassProperty(node);
+  }
+
+  // TODO: Update to visit type annotations when TypeScript/Flow support this syntax.
+  ClassPrivateMethod(node) {
+    super.MethodDefinition(node);
+  }
+
+  DeclareModule(node) {
+    this._visitDeclareX(node);
+  }
+
+  DeclareFunction(node) {
+    this._visitDeclareX(node);
+  }
+
+  DeclareVariable(node) {
+    this._visitDeclareX(node);
+  }
+
+  DeclareClass(node) {
+    this._visitDeclareX(node);
+  }
+
+  // visit OptionalMemberExpression as a MemberExpression.
+  OptionalMemberExpression(node) {
+    super.MemberExpression(node);
+  }
+
+  _visitClassProperty(node) {
+    this._visitTypeAnnotation(node.typeAnnotation);
+    this.visitProperty(node);
+  }
+
+  _visitDeclareX(node) {
+    if (node.id) {
+      this._createScopeVariable(node, node.id);
+    }
+
+    const typeParamScope = this._nestTypeParamScope(node);
+    if (typeParamScope) {
+      this.close(node);
+    }
+  }
+
+  _createScopeVariable(node, name) {
+    this.currentScope().variableScope.__define(
+      name,
+      new Definition("Variable", name, node, null, null, null),
+    );
+  }
+
+  _nestTypeParamScope(node) {
+    if (!node.typeParameters) {
+      return null;
+    }
+
+    const parentScope = this.scopeManager.__currentScope;
+    const scope = new escope.Scope(
+      this.scopeManager,
+      "type-parameters",
+      parentScope,
+      node,
+      false,
+    );
+
+    this.scopeManager.__nestScope(scope);
+    for (let j = 0; j < node.typeParameters.params.length; j++) {
+      const name = node.typeParameters.params[j];
+      scope.__define(name, new Definition("TypeParameter", name, name));
+      if (name.typeAnnotation) {
+        this._checkIdentifierOrVisit(name);
+      }
+    }
+    scope.__define = function() {
+      return parentScope.__define.apply(parentScope, arguments);
+    };
+
+    return scope;
+  }
+
+  _visitTypeAnnotation(node) {
+    if (!node) {
+      return;
+    }
+    if (Array.isArray(node)) {
+      node.forEach(this._visitTypeAnnotation, this);
+      return;
+    }
+
+    // get property to check (params, id, etc...)
+    const visitorValues = visitorKeysMap[node.type];
+    if (!visitorValues) {
+      return;
+    }
+
+    // can have multiple properties
+    for (let i = 0; i < visitorValues.length; i++) {
+      const visitorValue = visitorValues[i];
+      const propertyType = propertyTypes[visitorValue];
+      const nodeProperty = node[visitorValue];
+      // check if property or type is defined
+      if (propertyType == null || nodeProperty == null) {
+        continue;
+      }
+      if (propertyType.type === "loop") {
+        for (let j = 0; j < nodeProperty.length; j++) {
+          if (Array.isArray(propertyType.values)) {
+            for (let k = 0; k < propertyType.values.length; k++) {
+              const loopPropertyNode = nodeProperty[j][propertyType.values[k]];
+              if (loopPropertyNode) {
+                this._checkIdentifierOrVisit(loopPropertyNode);
+              }
+            }
+          } else {
+            this._checkIdentifierOrVisit(nodeProperty[j]);
+          }
+        }
+      } else if (propertyType.type === "single") {
+        this._checkIdentifierOrVisit(nodeProperty);
+      } else if (propertyType.type === "typeAnnotation") {
+        this._visitTypeAnnotation(node.typeAnnotation);
+      } else if (propertyType.type === "typeParameters") {
+        for (let l = 0; l < node.typeParameters.params.length; l++) {
+          this._checkIdentifierOrVisit(node.typeParameters.params[l]);
+        }
+      } else if (propertyType.type === "id") {
+        if (node.id.type === "Identifier") {
+          this._checkIdentifierOrVisit(node.id);
+        } else {
+          this._visitTypeAnnotation(node.id);
+        }
+      }
+    }
+  }
+
+  _checkIdentifierOrVisit(node) {
+    if (node?.typeAnnotation) {
+      this._visitTypeAnnotation(node.typeAnnotation);
+    } else if (node?.type === "Identifier") {
+      this.visit(node);
+    } else {
+      this._visitTypeAnnotation(node);
+    }
+  }
+
+  _visitArray(nodeList) {
+    if (nodeList) {
+      for (const node of nodeList) {
+        this.visit(node);
+      }
+    }
+  }
+}
+
+export default function(ast, parserOptions) {
+  const options = {
+    ignoreEval: true,
+    optimistic: false,
+    directive: false,
+    nodejsScope:
+      ast.sourceType === "script" &&
+      (parserOptions.ecmaFeatures &&
+        parserOptions.ecmaFeatures.globalReturn) === true,
+    impliedStrict: false,
+    sourceType: ast.sourceType,
+    ecmaVersion: parserOptions.ecmaVersion,
+    fallback,
+  };
+
+  options.childVisitorKeys = childVisitorKeys;
+
+  const scopeManager = new escope.ScopeManager(options);
+  const referencer = new Referencer(options, scopeManager);
+
+  referencer.visit(ast);
+
+  return scopeManager;
+}

eslint/babel-eslint-parser/src/babylon-to-espree/convertAST.js

@@ -0,0 +1,96 @@
+import { types as t, traverse } from "@babel/core";
+import convertProgramNode from "./convertProgramNode";
+
+const astTransformVisitor = {
+  noScope: true,
+  enter(path) {
+    const node = path.node;
+
+    // private var to track original node type
+    node._babelType = node.type;
+
+    if (node.innerComments) {
+      delete node.innerComments;
+    }
+
+    if (node.trailingComments) {
+      delete node.trailingComments;
+    }
+
+    if (node.leadingComments) {
+      delete node.leadingComments;
+    }
+  },
+  exit(path) {
+    const node = path.node;
+
+    if (path.isTypeParameter()) {
+      node.type = "Identifier";
+      node.typeAnnotation = node.bound;
+      delete node.bound;
+    }
+
+    // flow: prevent "no-undef"
+    // for "Component" in: "let x: React.Component"
+    if (path.isQualifiedTypeIdentifier()) {
+      delete node.id;
+    }
+    // for "b" in: "var a: { b: Foo }"
+    if (path.isObjectTypeProperty()) {
+      delete node.key;
+    }
+    // for "indexer" in: "var a: {[indexer: string]: number}"
+    if (path.isObjectTypeIndexer()) {
+      delete node.id;
+    }
+    // for "param" in: "var a: { func(param: Foo): Bar };"
+    if (path.isFunctionTypeParam()) {
+      delete node.name;
+    }
+
+    // modules
+    if (path.isImportDeclaration()) {
+      delete node.isType;
+    }
+
+    // template string range fixes
+    if (path.isTemplateLiteral()) {
+      for (let i = 0; i < node.quasis.length; i++) {
+        const q = node.quasis[i];
+        q.range[0] -= 1;
+        if (q.tail) {
+          q.range[1] += 1;
+        } else {
+          q.range[1] += 2;
+        }
+        q.loc.start.column -= 1;
+        if (q.tail) {
+          q.loc.end.column += 1;
+        } else {
+          q.loc.end.column += 2;
+        }
+      }
+    }
+  },
+};
+
+export default function(ast, code) {
+  const state = { source: code };
+
+  // Monkey patch visitor keys in order to be able to traverse the estree nodes
+  t.VISITOR_KEYS.Property = t.VISITOR_KEYS.ObjectProperty;
+  t.VISITOR_KEYS.MethodDefinition = [
+    "key",
+    "value",
+    "decorators",
+    "returnType",
+    "typeParameters",
+  ];
+
+  traverse(ast, astTransformVisitor, null, state);
+
+  delete t.VISITOR_KEYS.Property;
+  delete t.VISITOR_KEYS.MethodDefinition;
+
+  convertProgramNode(ast);
+}

eslint/babel-eslint-parser/src/babylon-to-espree/convertComments.js

@@ -0,0 +1,15 @@
+export default function(comments) {
+  for (let i = 0; i < comments.length; i++) {
+    const comment = comments[i];
+    if (comment.type === "CommentBlock") {
+      comment.type = "Block";
+    } else if (comment.type === "CommentLine") {
+      comment.type = "Line";
+    }
+    // sometimes comments don't get ranges computed,
+    // even with options.ranges === true
+    if (!comment.range) {
+      comment.range = [comment.start, comment.end];
+    }
+  }
+}

eslint/babel-eslint-parser/src/babylon-to-espree/convertProgramNode.js

@@ -0,0 +1,38 @@
+export default function(ast) {
+  ast.type = "Program";
+  ast.sourceType = ast.program.sourceType;
+  ast.directives = ast.program.directives;
+  ast.body = ast.program.body;
+  delete ast.program;
+
+  if (ast.comments.length) {
+    const lastComment = ast.comments[ast.comments.length - 1];
+
+    if (!ast.tokens.length) {
+      // if no tokens, the program starts at the end of the last comment
+      ast.start = lastComment.end;
+      ast.loc.start.line = lastComment.loc.end.line;
+      ast.loc.start.column = lastComment.loc.end.column;
+    } else {
+      const lastToken = ast.tokens[ast.tokens.length - 1];
+
+      if (lastComment.end > lastToken.end) {
+        // If there is a comment after the last token, the program ends at the
+        // last token and not the comment
+        ast.range[1] = lastToken.end;
+        ast.loc.end.line = lastToken.loc.end.line;
+        ast.loc.end.column = lastToken.loc.end.column;
+      }
+    }
+  } else {
+    if (!ast.tokens.length) {
+      ast.loc.start.line = 1;
+      ast.loc.end.line = 1;
+    }
+  }
+
+  if (ast.body && ast.body.length > 0) {
+    ast.loc.start.line = ast.body[0].loc.start.line;
+    ast.range[0] = ast.body[0].start;
+  }
+}

eslint/babel-eslint-parser/src/babylon-to-espree/convertTemplateType.js

@@ -0,0 +1,92 @@
+import { tokTypes as tt } from "@babel/core";
+
+export default function(tokens) {
+  let curlyBrace = null;
+  let templateTokens = [];
+  const result = [];
+
+  function addTemplateType() {
+    const start = templateTokens[0];
+    const end = templateTokens[templateTokens.length - 1];
+
+    const value = templateTokens.reduce((result, token) => {
+      if (token.value) {
+        result += token.value;
+      } else if (token.type !== tt.template) {
+        result += token.type.label;
+      }
+
+      return result;
+    }, "");
+
+    result.push({
+      type: "Template",
+      value: value,
+      start: start.start,
+      end: end.end,
+      loc: {
+        start: start.loc.start,
+        end: end.loc.end,
+      },
+    });
+
+    templateTokens = [];
+  }
+
+  tokens.forEach(token => {
+    switch (token.type) {
+      case tt.backQuote:
+        if (curlyBrace) {
+          result.push(curlyBrace);
+          curlyBrace = null;
+        }
+
+        templateTokens.push(token);
+
+        if (templateTokens.length > 1) {
+          addTemplateType();
+        }
+
+        break;
+
+      case tt.dollarBraceL:
+        templateTokens.push(token);
+        addTemplateType();
+        break;
+
+      case tt.braceR:
+        if (curlyBrace) {
+          result.push(curlyBrace);
+        }
+
+        curlyBrace = token;
+        break;
+
+      case tt.template:
+        if (curlyBrace) {
+          templateTokens.push(curlyBrace);
+          curlyBrace = null;
+        }
+
+        templateTokens.push(token);
+        break;
+
+      case tt.eof:
+        if (curlyBrace) {
+          result.push(curlyBrace);
+        }
+
+        break;
+
+      default:
+        if (curlyBrace) {
+          result.push(curlyBrace);
+          curlyBrace = null;
+        }
+
+        result.push(token);
+    }
+  });
+
+  return result;
+}

eslint/babel-eslint-parser/src/babylon-to-espree/convertToken.js

@@ -0,0 +1,88 @@
+import { tokTypes as tt } from "@babel/core";
+
+export default function(token, source) {
+  const type = token.type;
+  token.range = [token.start, token.end];
+
+  if (type === tt.name) {
+    token.type = "Identifier";
+  } else if (
+    type === tt.semi ||
+    type === tt.comma ||
+    type === tt.parenL ||
+    type === tt.parenR ||
+    type === tt.braceL ||
+    type === tt.braceR ||
+    type === tt.slash ||
+    type === tt.dot ||
+    type === tt.bracketL ||
+    type === tt.bracketR ||
+    type === tt.ellipsis ||
+    type === tt.arrow ||
+    type === tt.pipeline ||
+    type === tt.star ||
+    type === tt.incDec ||
+    type === tt.colon ||
+    type === tt.question ||
+    type === tt.questionDot ||
+    type === tt.template ||
+    type === tt.backQuote ||
+    type === tt.dollarBraceL ||
+    type === tt.at ||
+    type === tt.logicalOR ||
+    type === tt.logicalAND ||
+    type === tt.nullishCoalescing ||
+    type === tt.bitwiseOR ||
+    type === tt.bitwiseXOR ||
+    type === tt.bitwiseAND ||
+    type === tt.equality ||
+    type === tt.relational ||
+    type === tt.bitShift ||
+    type === tt.plusMin ||
+    type === tt.modulo ||
+    type === tt.exponent ||
+    type === tt.bang ||
+    type === tt.tilde ||
+    type === tt.doubleColon ||
+    type === tt.hash ||
+    type.isAssign
+  ) {
+    token.type = "Punctuator";
+    if (!token.value) token.value = type.label;
+  } else if (type === tt.jsxTagStart) {
+    token.type = "Punctuator";
+    token.value = "<";
+  } else if (type === tt.jsxTagEnd) {
+    token.type = "Punctuator";
+    token.value = ">";
+  } else if (type === tt.jsxName) {
+    token.type = "JSXIdentifier";
+  } else if (type === tt.jsxText) {
+    token.type = "JSXText";
+  } else if (type.keyword === "null") {
+    token.type = "Null";
+  } else if (type.keyword === "false" || type.keyword === "true") {
+    token.type = "Boolean";
+  } else if (type.keyword) {
+    token.type = "Keyword";
+  } else if (type === tt.num) {
+    token.type = "Numeric";
+    token.value = source.slice(token.start, token.end);
+  } else if (type === tt.string) {
+    token.type = "String";
+    token.value = source.slice(token.start, token.end);
+  } else if (type === tt.regexp) {
+    token.type = "RegularExpression";
+    const value = token.value;
+    token.regex = {
+      pattern: value.pattern,
+      flags: value.flags,
+    };
+    token.value = `/${value.pattern}/${value.flags}`;
+  } else if (type === tt.bigint) {
+    token.type = "Numeric";
+    token.value = `${token.value}n`;
+  }
+
+  return token;
+}

eslint/babel-eslint-parser/src/babylon-to-espree/convertTokens.js

@@ -0,0 +1,8 @@
+import convertTemplateType from "./convertTemplateType";
+import convertToken from "./convertToken";
+
+export default function(tokens, code) {
+  return convertTemplateType(tokens)
+    .filter(t => t.type !== "CommentLine" && t.type !== "CommentBlock")
+    .map(t => convertToken(t, code));
+}

eslint/babel-eslint-parser/src/babylon-to-espree/index.js

@@ -0,0 +1,9 @@
+import convertTokens from "./convertTokens";
+import convertComments from "./convertComments";
+import convertAST from "./convertAST";
+
+export default function(ast, code) {
+  ast.tokens = convertTokens(ast.tokens, code);
+  convertComments(ast.comments);
+  convertAST(ast, code);
+}

eslint/babel-eslint-parser/src/configuration.js

@@ -0,0 +1,61 @@
+import { loadPartialConfig } from "@babel/core";
+
+export function normalizeESLintConfig(options) {
+  const defaultOptions = {
+    babelOptions: {},
+    ecmaVersion: 2020,
+    sourceType: "module",
+    allowImportExportEverywhere: false,
+  };
+
+  return Object.assign(defaultOptions, options);
+}
+
+export function normalizeBabelParseConfig(options) {
+  const parseOptions = {
+    sourceType: options.sourceType,
+    filename: options.filePath,
+    cwd: options.babelOptions.cwd,
+    root: options.babelOptions.root,
+    rootMode: options.babelOptions.rootMode,
+    envName: options.babelOptions.envName,
+    configFile: options.babelOptions.configFile,
+    babelrc: options.babelOptions.babelrc,
+    babelrcRoots: options.babelOptions.babelrcRoots,
+    extends: options.babelOptions.extends,
+    env: options.babelOptions.env,
+    overrides: options.babelOptions.overrides,
+    test: options.babelOptions.test,
+    include: options.babelOptions.include,
+    exclude: options.babelOptions.exclude,
+    ignore: options.babelOptions.ignore,
+    only: options.babelOptions.only,
+    parserOpts: {
+      allowImportExportEverywhere: options.allowImportExportEverywhere,
+      allowReturnOutsideFunction: true,
+      allowSuperOutsideMethod: true,
+      ranges: true,
+      tokens: true,
+      plugins: ["estree"],
+    },
+    caller: {
+      name: "@babel/eslint-parser",
+    },
+  };
+
+  if (options.requireConfigFile !== false) {
+    const config = loadPartialConfig(parseOptions);
+
+    if (config !== null) {
+      if (!config.hasFilesystemConfig()) {
+        throw new Error(
+          `No Babel config file detected for ${config.options.filename}. Either disable config file checking with requireConfigFile: false, or configure Babel so that it can find the config files.`,
+        );
+      }
+
+      return config.options;
+    }
+  }
+
+  return parseOptions;
+}

eslint/babel-eslint-parser/src/index.js

@@ -0,0 +1,26 @@
+import semver from "semver";
+import { version as CURRENT_BABEL_VERSION } from "@babel/core";
+import parseWithScope from "./parse-with-scope";
+import { normalizeESLintConfig } from "./configuration";
+import packageJson from "../package.json";
+
+const SUPPORTED_BABEL_VERSION_RANGE =
+  packageJson.peerDependencies["@babel/core"];
+const IS_RUNNING_SUPPORTED_VERSION = semver.satisfies(
+  semver.coerce(CURRENT_BABEL_VERSION).raw,
+  SUPPORTED_BABEL_VERSION_RANGE,
+);
+
+export function parse(code, options) {
+  return parseForESLint(code, options).ast;
+}
+
+export function parseForESLint(code, options = {}) {
+  if (!IS_RUNNING_SUPPORTED_VERSION) {
+    throw new Error(
+      `babel-eslint@${packageJson.version} does not support @babel/core@${CURRENT_BABEL_VERSION}. Please downgrade to babel-eslint@^10 or upgrade to @babel/core@${SUPPORTED_BABEL_VERSION_RANGE}`,
+    );
+  }
+
+  return parseWithScope(code, normalizeESLintConfig(options));
+}

eslint/babel-eslint-parser/src/parse-with-scope.js

@@ -0,0 +1,10 @@
+import visitorKeys from "./visitor-keys";
+import analyzeScope from "./analyze-scope";
+import parse from "./parse";
+
+export default function(code, options) {
+  const ast = parse(code, options);
+  const scopeManager = analyzeScope(ast, options);
+
+  return { ast, scopeManager, visitorKeys };
+}

eslint/babel-eslint-parser/src/parse.js

@@ -0,0 +1,23 @@
+import { parseSync as babelParse } from "@babel/core";
+import babylonToEspree from "./babylon-to-espree";
+import { normalizeBabelParseConfig } from "./configuration";
+
+export default function parse(code, options) {
+  const parseOptions = normalizeBabelParseConfig(options);
+  let ast;
+
+  try {
+    ast = babelParse(code, parseOptions);
+  } catch (err) {
+    if (err instanceof SyntaxError) {
+      err.lineNumber = err.loc.line;
+      err.column = err.loc.column;
+    }
+
+    throw err;
+  }
+
+  babylonToEspree(ast, code);
+
+  return ast;
+}

eslint/babel-eslint-parser/src/visitor-keys.js

@@ -0,0 +1,15 @@
+import { types as t } from "@babel/core";
+import { KEYS as ESLINT_VISITOR_KEYS } from "eslint-visitor-keys";
+
+const { VISITOR_KEYS: BABEL_VISITOR_KEYS } = t;
+
+export default Object.assign(
+  {
+    Literal: ESLINT_VISITOR_KEYS.Literal,
+    MethodDefinition: ["decorators"].concat(
+      ESLINT_VISITOR_KEYS.MethodDefinition,
+    ),
+    Property: ["decorators"].concat(ESLINT_VISITOR_KEYS.Property),
+  },
+  BABEL_VISITOR_KEYS,
+);

eslint/babel-eslint-parser/test/babel-eslint-parser.js

@@ -0,0 +1,535 @@
+import assert from "assert";
+import espree from "espree";
+import escope from "eslint-scope";
+import unpad from "dedent";
+import { parseForESLint } from "../src";
+import assertImplementsAST from "./helpers/assert-implements-ast";
+
+const babelOptions = {
+  configFile: require.resolve(
+    "@babel/eslint-shared-fixtures/config/babel.config.js",
+  ),
+};
+
+function parseAndAssertSame(code) {
+  code = unpad(code);
+  const esAST = espree.parse(code, {
+    ecmaFeatures: {
+      // enable JSX parsing
+      jsx: true,
+      // enable return in global scope
+      globalReturn: true,
+      // enable implied strict mode (if ecmaVersion >= 5)
+      impliedStrict: true,
+      // allow experimental object rest/spread
+      experimentalObjectRestSpread: true,
+    },
+    tokens: true,
+    loc: true,
+    range: true,
+    comment: true,
+    ecmaVersion: 2020,
+    sourceType: "module",
+  });
+  const babylonAST = parseForESLint(code, {
+    eslintVisitorKeys: true,
+    eslintScopeManager: true,
+    babelOptions,
+  }).ast;
+  assertImplementsAST(esAST, babylonAST);
+}
+
+describe("babylon-to-espree", () => {
+  describe("compatibility", () => {
+    it("should allow ast.analyze to be called without options", function() {
+      const esAST = parseForESLint("`test`", {
+        eslintScopeManager: true,
+        eslintVisitorKeys: true,
+        babelOptions,
+      }).ast;
+      expect(() => {
+        escope.analyze(esAST);
+      }).not.toThrow(new TypeError("Should allow no options argument."));
+    });
+  });
+
+  describe("templates", () => {
+    it("empty template string", () => {
+      parseAndAssertSame("``");
+    });
+
+    it("template string", () => {
+      parseAndAssertSame("`test`");
+    });
+
+    it("template string using $", () => {
+      parseAndAssertSame("`$`");
+    });
+
+    it("template string with expression", () => {
+      parseAndAssertSame("`${a}`");
+    });
+
+    it("template string with multiple expressions", () => {
+      parseAndAssertSame("`${a}${b}${c}`");
+    });
+
+    it("template string with expression and strings", () => {
+      parseAndAssertSame("`a${a}a`");
+    });
+
+    it("template string with binary expression", () => {
+      parseAndAssertSame("`a${a + b}a`");
+    });
+
+    it("tagged template", () => {
+      parseAndAssertSame("jsx`<Button>Click</Button>`");
+    });
+
+    it("tagged template with expression", () => {
+      parseAndAssertSame("jsx`<Button>Hi ${name}</Button>`");
+    });
+
+    it("tagged template with new operator", () => {
+      parseAndAssertSame("new raw`42`");
+    });
+
+    it("template with nested function/object", () => {
+      parseAndAssertSame(
+        "`outer${{x: {y: 10}}}bar${`nested${function(){return 1;}}endnest`}end`",
+      );
+    });
+
+    it("template with braces inside and outside of template string #96", () => {
+      parseAndAssertSame(
+        "if (a) { var target = `{}a:${webpackPort}{}}}}`; } else { app.use(); }",
+      );
+    });
+
+    it("template also with braces #96", () => {
+      parseAndAssertSame(`
+        export default function f1() {
+          function f2(foo) {
+            const bar = 3;
+            return \`\${foo} \${bar}\`;
+          }
+          return f2;
+        }
+      `);
+    });
+
+    it("template with destructuring #31", () => {
+      parseAndAssertSame(`
+        module.exports = {
+          render() {
+            var {name} = this.props;
+            return Math.max(null, \`Name: \${name}, Name: \${name}\`);
+          }
+        };
+      `);
+    });
+
+    it("template with arrow returning template #603", () => {
+      parseAndAssertSame(`
+        var a = \`\${() => {
+          \`\${''}\`
+        }}\`;
+      `);
+    });
+
+    it("template string with object with template string inside", () => {
+      parseAndAssertSame("`${ { a:`${2}` } }`");
+    });
+  });
+
+  it("simple expression", () => {
+    parseAndAssertSame("a = 1");
+  });
+
+  it("logical NOT", () => {
+    parseAndAssertSame("!0");
+  });
+
+  it("bitwise NOT", () => {
+    parseAndAssertSame("~0");
+  });
+
+  it("class declaration", () => {
+    parseAndAssertSame("class Foo {}");
+  });
+
+  it("class expression", () => {
+    parseAndAssertSame("var a = class Foo {}");
+  });
+
+  it("jsx expression", () => {
+    parseAndAssertSame("<App />");
+  });
+
+  it("jsx expression with 'this' as identifier", () => {
+    parseAndAssertSame("<this />");
+  });
+
+  it("jsx expression with a dynamic attribute", () => {
+    parseAndAssertSame("<App foo={bar} />");
+  });
+
+  it("jsx expression with a member expression as identifier", () => {
+    parseAndAssertSame("<foo.bar />");
+  });
+
+  it("jsx expression with spread", () => {
+    parseAndAssertSame("var myDivElement = <div {...this.props} />;");
+  });
+
+  it("empty jsx text", () => {
+    parseAndAssertSame("<a></a>");
+  });
+
+  it("jsx text with content", () => {
+    parseAndAssertSame("<a>Hello, world!</a>");
+  });
+
+  it("nested jsx", () => {
+    parseAndAssertSame("<div>\n<h1>Wat</h1>\n</div>");
+  });
+
+  it("default import", () => {
+    parseAndAssertSame('import foo from "foo";');
+  });
+
+  it("import specifier", () => {
+    parseAndAssertSame('import { foo } from "foo";');
+  });
+
+  it("import specifier with name", () => {
+    parseAndAssertSame('import { foo as bar } from "foo";');
+  });
+
+  it("import bare", () => {
+    parseAndAssertSame('import "foo";');
+  });
+
+  it("export default class declaration", () => {
+    parseAndAssertSame("export default class Foo {}");
+  });
+
+  it("export default class expression", () => {
+    parseAndAssertSame("export default class {}");
+  });
+
+  it("export default function declaration", () => {
+    parseAndAssertSame("export default function Foo() {}");
+  });
+
+  it("export default function expression", () => {
+    parseAndAssertSame("export default function () {}");
+  });
+
+  it("export all", () => {
+    parseAndAssertSame('export * from "foo";');
+  });
+
+  it("export named", () => {
+    parseAndAssertSame("var foo = 1;export { foo };");
+  });
+
+  it("export named alias", () => {
+    parseAndAssertSame("var foo = 1;export { foo as bar };");
+  });
+
+  // Espree doesn't support the optional chaining operator yet
+  it("optional chaining operator (token)", () => {
+    const code = "foo?.bar";
+    const babylonAST = parseForESLint(code, {
+      eslintVisitorKeys: true,
+      eslintScopeManager: true,
+      babelOptions,
+    }).ast;
+    assert.strictEqual(babylonAST.tokens[1].type, "Punctuator");
+  });
+
+  // Espree doesn't support the nullish coalescing operator yet
+  it("nullish coalescing operator (token)", () => {
+    const code = "foo ?? bar";
+    const babylonAST = parseForESLint(code, {
+      eslintVisitorKeys: true,
+      eslintScopeManager: true,
+      babelOptions,
+    }).ast;
+    assert.strictEqual(babylonAST.tokens[1].type, "Punctuator");
+  });
+
+  // Espree doesn't support the pipeline operator yet
+  it("pipeline operator (token)", () => {
+    const code = "foo |> bar";
+    const babylonAST = parseForESLint(code, {
+      eslintVisitorKeys: true,
+      eslintScopeManager: true,
+      babelOptions,
+    }).ast;
+    assert.strictEqual(babylonAST.tokens[1].type, "Punctuator");
+  });
+
+  // Espree doesn't support private fields yet
+  it("hash (token)", () => {
+    const code = "class A { #x }";
+    const babylonAST = parseForESLint(code, {
+      eslintVisitorKeys: true,
+      eslintScopeManager: true,
+      babelOptions,
+    }).ast;
+    assert.strictEqual(babylonAST.tokens[3].type, "Punctuator");
+    assert.strictEqual(babylonAST.tokens[3].value, "#");
+  });
+
+  it.skip("empty program with line comment", () => {
+    parseAndAssertSame("// single comment");
+  });
+
+  it.skip("empty program with block comment", () => {
+    parseAndAssertSame("  /* multiline\n * comment\n*/");
+  });
+
+  it("line comments", () => {
+    parseAndAssertSame(`
+      // single comment
+      var foo = 15; // comment next to statement
+      // second comment after statement
+    `);
+  });
+
+  it("block comments", () => {
+    parseAndAssertSame(`
+      /* single comment */
+      var foo = 15; /* comment next to statement */
+      /*
+       * multiline
+       * comment
+       */
+    `);
+  });
+
+  it("block comments #124", () => {
+    parseAndAssertSame(`
+      React.createClass({
+        render() {
+          // return (
+          //   <div />
+          // ); // <-- this is the line that is reported
+        }
+      });
+    `);
+  });
+
+  it("null", () => {
+    parseAndAssertSame("null");
+  });
+
+  it("boolean", () => {
+    parseAndAssertSame("if (true) {} else if (false) {}");
+  });
+
+  it("regexp", () => {
+    parseAndAssertSame("/affix-top|affix-bottom|affix|[a-z]/");
+  });
+
+  it("regexp", () => {
+    parseAndAssertSame("const foo = /foo/;");
+  });
+
+  it("regexp y flag", () => {
+    parseAndAssertSame("const foo = /foo/y;");
+  });
+
+  it("regexp u flag", () => {
+    parseAndAssertSame("const foo = /foo/u;");
+  });
+
+  it("regexp in a template string", () => {
+    parseAndAssertSame('`${/\\d/.exec("1")[0]}`');
+  });
+
+  it("first line is empty", () => {
+    parseAndAssertSame('\nimport Immutable from "immutable";');
+  });
+
+  it("empty", () => {
+    parseAndAssertSame("");
+  });
+
+  it("jsdoc", () => {
+    parseAndAssertSame(`
+      /**
+      * @param {object} options
+      * @return {number}
+      */
+      const test = function({ a, b, c }) {
+        return a + b + c;
+      };
+      module.exports = test;
+    `);
+  });
+
+  it("empty block with comment", () => {
+    parseAndAssertSame(`
+      function a () {
+        try {
+          b();
+        } catch (e) {
+          // asdf
+        }
+      }
+    `);
+  });
+
+  describe("babel tests", () => {
+    it("MethodDefinition", () => {
+      parseAndAssertSame(`
+        export default class A {
+          a() {}
+        }
+      `);
+    });
+
+    it("MethodDefinition 2", () => {
+      parseAndAssertSame(
+        "export default class Bar { get bar() { return 42; }}",
+      );
+    });
+
+    it("ClassMethod", () => {
+      parseAndAssertSame(`
+        class A {
+          constructor() {
+          }
+        }
+      `);
+    });
+
+    it("ClassMethod multiple params", () => {
+      parseAndAssertSame(`
+        class A {
+          constructor(a, b, c) {
+          }
+        }
+      `);
+    });
+
+    it("ClassMethod multiline", () => {
+      parseAndAssertSame(`
+        class A {
+          constructor (
+            a,
+            b,
+            c
+          )
+
+          {
+
+          }
+        }
+      `);
+    });
+
+    it("ClassMethod oneline", () => {
+      parseAndAssertSame("class A { constructor(a, b, c) {} }");
+    });
+
+    it("ObjectMethod", () => {
+      parseAndAssertSame(`
+        var a = {
+          b(c) {
+          }
+        }
+      `);
+    });
+
+    it("do not allow import export everywhere", () => {
+      assert.throws(() => {
+        parseAndAssertSame('function F() { import a from "a"; }');
+      }, /SyntaxError: 'import' and 'export' may only appear at the top level/);
+    });
+
+    it("return outside function", () => {
+      parseAndAssertSame("return;");
+    });
+
+    it("super outside method", () => {
+      assert.throws(() => {
+        parseAndAssertSame("function F() { super(); }");
+      }, /SyntaxError: 'super' keyword outside a method/);
+    });
+
+    it("StringLiteral", () => {
+      parseAndAssertSame("");
+      parseAndAssertSame("");
+      parseAndAssertSame("a");
+    });
+
+    it("getters and setters", () => {
+      parseAndAssertSame("class A { get x ( ) { ; } }");
+      parseAndAssertSame(`
+        class A {
+          get x(
+          )
+          {
+            ;
+          }
+        }
+      `);
+      parseAndAssertSame("class A { set x (a) { ; } }");
+      parseAndAssertSame(`
+        class A {
+          set x(a
+          )
+          {
+            ;
+          }
+        }
+      `);
+      parseAndAssertSame(`
+        var B = {
+          get x () {
+            return this.ecks;
+          },
+          set x (ecks) {
+            this.ecks = ecks;
+          }
+        };
+      `);
+    });
+
+    it("RestOperator", () => {
+      parseAndAssertSame("var { a, ...b } = c");
+      parseAndAssertSame("var [ a, ...b ] = c");
+      parseAndAssertSame("var a = function (...b) {}");
+    });
+
+    it("SpreadOperator", () => {
+      parseAndAssertSame("var a = { b, ...c }");
+      parseAndAssertSame("var a = [ a, ...b ]");
+      parseAndAssertSame("var a = sum(...b)");
+    });
+
+    it("Async/Await", () => {
+      parseAndAssertSame(`
+        async function a() {
+          await 1;
+        }
+      `);
+    });
+
+    it("BigInt", () => {
+      parseAndAssertSame(`
+        const a = 1n;
+      `);
+    });
+
+    it("Dynamic Import", () => {
+      parseAndAssertSame(`
+        const a = import('a');
+      `);
+    });
+  });
+});

eslint/babel-eslint-parser/test/fixtures/eslint-plugin-import/.eslintrc.yml

@@ -0,0 +1,11 @@
+root: true
+
+# babel-eslint
+parser: ../../../lib/index.js
+
+# use eslint-plugin-import
+plugins:
+  - import
+rules:
+  import/no-named-as-default: error
+  no-unused-vars: error

eslint/babel-eslint-parser/test/fixtures/eslint-plugin-import/a.js

@@ -0,0 +1 @@
+export default function foo() { }

eslint/babel-eslint-parser/test/fixtures/eslint-plugin-import/b.js

@@ -0,0 +1 @@
+import foo from './a.js';

eslint/babel-eslint-parser/test/fixtures/eslint-plugin-import/c.js

@@ -0,0 +1,4 @@
+// @flow
+type Foo = {};
+
+const FlowTypeButton = ({ }: Foo) => { };

eslint/babel-eslint-parser/test/fixtures/rules/strict/function-with.js

@@ -0,0 +1,3 @@
+function x () {
+  "use strict";
+}

eslint/babel-eslint-parser/test/fixtures/rules/strict/function-without.js

@@ -0,0 +1 @@
+function x () {}

eslint/babel-eslint-parser/test/fixtures/rules/strict/global-with-function-with.js

@@ -0,0 +1,5 @@
+"use strict";
+
+function x () {
+  "use strict";
+}

eslint/babel-eslint-parser/test/fixtures/rules/strict/global-with-function-without.js

@@ -0,0 +1,3 @@
+"use strict";
+
+function x () {}

eslint/babel-eslint-parser/test/fixtures/rules/strict/global-with.js

@@ -0,0 +1,6 @@
+"use strict";
+/*
+The empty statement is intentional. As of now, ESLint won't enforce
+string: [2, "global"] on a program with an empty body. A test for that without
+massaging the AST to ESlint's input format should fail.
+*/

eslint/babel-eslint-parser/test/fixtures/rules/strict/none.js

@@ -0,0 +1 @@
+"no use strict anywhere";

eslint/babel-eslint-parser/test/fixtures/rules/syntax-error.js

@@ -0,0 +1,6 @@
+class ClassName {
+  constructor() {
+
+  },
+  aMethod() {}
+}

eslint/babel-eslint-parser/test/helpers/assert-implements-ast.js

@@ -0,0 +1,40 @@
+// Checks if the source ast implements the target ast. Ignores extra keys on source ast
+export default function assertImplementsAST(target, source, path) {
+  if (!path) {
+    path = [];
+  }
+
+  function error(text) {
+    const err = new Error(`At ${path.join(".")}: ${text}:`);
+    err.depth = path.length + 1;
+    throw err;
+  }
+
+  const typeA = target === null ? "null" : typeof target;
+  const typeB = source === null ? "null" : typeof source;
+  if (typeA !== typeB) {
+    error(
+      `have different types (${typeA} !== ${typeB}) (${target} !== ${source})`,
+    );
+  } else if (
+    typeA === "object" &&
+    ["RegExp"].indexOf(target.constructor.name) !== -1 &&
+    target.constructor.name !== source.constructor.name
+  ) {
+    error(
+      `object have different constructors (${target.constructor.name} !== ${source.constructor.name}`,
+    );
+  } else if (typeA === "object") {
+    const keysTarget = Object.keys(target);
+    for (const i in keysTarget) {
+      const key = keysTarget[i];
+      path.push(key);
+      assertImplementsAST(target[key], source[key], path);
+      path.pop();
+    }
+  } else if (target !== source) {
+    error(
+      `are different (${JSON.stringify(target)} !== ${JSON.stringify(source)})`,
+    );
+  }
+}

eslint/babel-eslint-parser/test/integration.js

@@ -0,0 +1,237 @@
+import eslint from "eslint";
+import fs from "fs";
+import path from "path";
+import * as parser from "../src";
+
+eslint.linter.defineParser("current-babel-eslint", parser);
+
+const paths = {
+  fixtures: path.join(__dirname, "fixtures", "rules"),
+};
+
+const encoding = "utf8";
+const errorLevel = 2;
+
+const baseEslintOpts = {
+  parser: "current-babel-eslint",
+  parserOptions: {
+    sourceType: "script",
+    requireConfigFile: false,
+    babelOptions: { configFile: false }
+  },
+};
+
+/**
+ * Load a fixture and run eslint.linter.verify() on it.
+ * Pass the return value to done().
+ * @param object opts
+ * @param function done
+ */
+function lint(opts, done) {
+  readFixture(opts.fixture, (err, src) => {
+    if (err) return done(err);
+    done(null, eslint.linter.verify(src, opts.eslint));
+  });
+}
+
+/**
+ * Read a fixture file, passing the content to done().
+ * @param string|array id
+ * @param function done
+ */
+function readFixture(id, done) {
+  if (Array.isArray(id)) id = path.join.apply(path, id);
+  if (!path.extname(id)) id += ".js";
+  fs.readFile(path.join(paths.fixtures, id), encoding, done);
+}
+// readFixture
+
+describe("Rules:", () => {
+  describe("`strict`", strictSuite);
+});
+// describe
+
+function strictSuite() {
+  const ruleId = "strict";
+
+  describe("when set to 'never'", () => {
+    const eslintOpts = Object.assign({}, baseEslintOpts, {
+      rules: {},
+    });
+    eslintOpts.rules[ruleId] = [errorLevel, "never"];
+
+    ["global-with", "function-with"].forEach(fixture => {
+      it(`should error on ${fixture.match(/^[^-]+/)[0]} directive`, done => {
+        lint(
+          {
+            fixture: ["strict", fixture],
+            eslint: eslintOpts,
+          },
+          (err, report) => {
+            if (err) return done(err);
+            expect(report[0].ruleId).toBe(ruleId);
+            done();
+          },
+        );
+      });
+      // it
+    });
+  });
+  // describe
+
+  describe("when set to 'global'", () => {
+    const eslintOpts = Object.assign({}, baseEslintOpts, {
+      rules: {},
+    });
+    eslintOpts.rules[ruleId] = [errorLevel, "global"];
+
+    it("shouldn't error on single global directive", done => {
+      lint(
+        {
+          fixture: ["strict", "global-with"],
+          eslint: eslintOpts,
+        },
+        (err, report) => {
+          if (err) return done(err);
+          expect(report.length).toBe(0);
+          done();
+        },
+      );
+    });
+    // it
+
+    it("should error twice on global directive: no and function directive: yes", done => {
+      lint(
+        {
+          fixture: ["strict", "function-with"],
+          eslint: eslintOpts,
+        },
+        (err, report) => {
+          if (err) return done(err);
+          [0, 1].forEach(i => {
+            expect(report[0].ruleId).toBe(ruleId);
+          });
+          done();
+        },
+      );
+    });
+    // it
+
+    it("should error on function directive", done => {
+      lint(
+        {
+          fixture: ["strict", "global-with-function-with"],
+          eslint: eslintOpts,
+        },
+        (err, report) => {
+          if (err) return done(err);
+          expect(report[0].ruleId).toBe(ruleId);
+          // This is to make sure the test fails prior to adapting Babel AST
+          // directive representation to ESLint format. Otherwise it reports an
+          // error for missing global directive that masquerades as the expected
+          // result of the previous assertion.
+          expect(report[0].nodeType).not.toBe("Program");
+          done();
+        },
+      );
+    });
+    // it
+
+    it("should error on no directive", done => {
+      lint(
+        {
+          fixture: ["strict", "none"],
+          eslint: eslintOpts,
+        },
+        (err, report) => {
+          if (err) return done(err);
+          expect(report[0].ruleId).toBe(ruleId);
+          done();
+        },
+      );
+    });
+    // it
+  });
+  // describe
+
+  describe("when set to 'function'", () => {
+    const eslintOpts = Object.assign({}, baseEslintOpts, {
+      rules: {},
+    });
+    eslintOpts.rules[ruleId] = [errorLevel, "function"];
+
+    it("shouldn't error on single function directive", done => {
+      lint(
+        {
+          fixture: ["strict", "function-with"],
+          eslint: eslintOpts,
+        },
+        (err, report) => {
+          if (err) return done(err);
+          expect(report.length).toBe(0);
+          done();
+        },
+      );
+    });
+    // it
+
+    it("should error twice on function directive: no and global directive: yes", done => {
+      lint(
+        {
+          fixture: ["strict", "global-with-function-without"],
+          eslint: eslintOpts,
+        },
+        (err, report) => {
+          if (err) return done(err);
+          [0, 1].forEach(i => {
+            expect(report[i].ruleId).toBe(ruleId);
+          });
+          done();
+        },
+      );
+    });
+    // it
+
+    it("should error on only global directive", done => {
+      lint(
+        {
+          fixture: ["strict", "global-with"],
+          eslint: eslintOpts,
+        },
+        (err, report) => {
+          if (err) return done(err);
+          expect(report[0].ruleId).toBe(ruleId);
+          done();
+        },
+      );
+    });
+    // it
+
+    it("should error on extraneous global directive", done => {
+      lint(
+        {
+          fixture: ["strict", "global-with-function-with"],
+          eslint: eslintOpts,
+        },
+        (err, report) => {
+          if (err) return done(err);
+          expect(report[0].ruleId).toBe(ruleId);
+          expect(report[0].nodeType.indexOf("Function")).toBe(-1);
+          done();
+        },
+      );
+    });
+    // it
+  });
+}
+
+describe("https://github.com/babel/babel-eslint/issues/558", () => {
+  it("doesn't crash with eslint-plugin-import", () => {
+    const engine = new eslint.CLIEngine({ ignore: false });
+    const files = ["a.js", "b.js", "c.js"];
+    let fileWithPath = files.map(file =>
+      path.resolve(__dirname, `./fixtures/eslint-plugin-import/${file}`),
+    );
+    engine.executeOnFiles(fileWithPath);
+  });
+});