v7.0.0-beta.45

* feat: add noConflict polyfill entry
* use a warning

.babelignore

@@ -1,3 +1,5 @@
 # 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

@@ -1,29 +1,80 @@
 "use strict";
 
-let envOpts = {
-  loose: true
-};
+module.exports = function(api) {
+  const env = api.env();
 
-module.exports = {
-  comments: false,
-  presets: [
-    [
-      "env", envOpts
-    ],
-    "stage-0",
-    "flow",
-  ],
-  env: {
-    cov: {
-      auxiliaryCommentBefore: "istanbul ignore next",
-      plugins: ["istanbul"]
-    }
-  }
-};
+  const includeCoverage = process.env.BABEL_COVERAGE === "true";
 
-if (process.env.BABEL_ENV === 'development') {
-  envOpts.targets = {
-    node: "current"
+  const envOpts = {
+    loose: true,
+    modules: false,
+    exclude: ["transform-typeof-symbol"],
   };
-  envOpts.debug = true;
+
+  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

@@ -0,0 +1,56 @@
+version: 2
+aliases:
+  - &restore-node-modules-cache
+    keys:
+      - v1-yarn-deps-{{ checksum "yarn.lock" }}
+
+  - &restore-yarn-cache
+    keys:
+      - v1-yarn-cache
+
+  - &save-node-modules-cache
+    paths:
+      - node_modules
+    key: v1-yarn-deps-{{ checksum "yarn.lock" }}
+
+  - &save-yarn-cache
+    paths:
+      - ~/.yarn-cache
+    key: v1-yarn-cache
+
+  - &artifact_babel
+    path: ~/babel/packages/babel-standalone/babel.js
+
+  - &artifact_babel_min
+    path: ~/babel/packages/babel-standalone/babel.min.js
+
+  - &artifact_env
+    path: ~/babel/packages/babel-preset-env-standalone/babel-preset-env.js
+
+  - &artifact_env_min
+    path: ~/babel/packages/babel-preset-env-standalone/babel-preset-env.min.js
+
+jobs:
+  build:
+    working_directory: ~/babel
+    docker:
+      - image: circleci/node:9
+    steps:
+      - checkout
+      - restore-cache: *restore-yarn-cache
+      - restore-cache: *restore-node-modules-cache
+      - run: yarn --version
+      - 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/
+      - 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

.editorconfig

@@ -9,3 +9,6 @@ end_of_line = lf
 [*.{js,json}]
 indent_style = space
 indent_size = 2
+
+[*.{md,markdown}]
+trim_trailing_whitespace = false

.eslintignore

@@ -1,4 +1,8 @@
 /lib
+/build
+/.git
+package.json
+lerna.json
 packages/babel-runtime
 !packages/babel-runtime/scripts
 !packages/babel-runtime/core-js.js
@@ -7,3 +11,15 @@ packages/*/lib
 packages/*/dist
 packages/*/test/fixtures
 packages/*/test/tmp
+codemods/*/node_modules
+codemods/*/lib
+codemods/*/dist
+codemods/*/test/fixtures
+codemods/*/test/tmp
+packages/babel-preset-env/data
+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

.eslintrc

@@ -1,14 +0,0 @@
-{
-  "extends": "babel",
-  "plugins": [
-    "prettier"
-  ],
-  "rules": {
-    "curly": ["error", "multi-line"],
-    "prettier/prettier": ["error", { "trailingComma": "es5" }]
-  },
-  "env": {
-    "node": true,
-    "mocha": true
-  }
-}

.eslintrc.json

@@ -0,0 +1,33 @@
+{
+  "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

@@ -1,18 +1,27 @@
 [ignore]
+.*/build/.*
 .*/packages/.*/lib
 .*/packages/.*/test
+.*/codemods/.*/lib
+.*/codemods/.*/test
 .*/node_modules/conventional-changelog-core/
 
 [include]
 packages/*/src
+codemods/*/src
 
 [libs]
 lib/file.js
 lib/parser.js
-lib/types.js
 lib/third-party-libs.js.flow
+packages/babel-types/lib/index.js.flow
 
 [options]
-strip_root=true
+include_warnings=true
 suppress_comment= \\(.\\|\n\\)*\\$FlowFixMe
 suppress_comment= \\(.\\|\n\\)*\\$FlowIssue
+suppress_comment= \\(.\\|\n\\)*\\$FlowIgnore
+suppress_type=$FlowFixMe
+suppress_type=$FlowSubtype
+esproposal.export_star_as=enable
+module.name_mapper='^@babel\/\([a-zA-Z0-9_\-]+\)$' -> '<PROJECT_ROOT>/packages/babel-\1/src/index'

.github/ISSUE_TEMPLATE.md

@@ -5,7 +5,7 @@ Search open/closed issues before submitting since someone might have asked the s
 
 If you have a support request or question please submit them to one of this resources:
 
-* Slack Community: https://slack.babeljs.io/
+* Slack Community: https://babeljs.slack.com (you can sign-up at https://slack.babeljs.io/ for an invite)
 * 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
@@ -26,7 +26,7 @@ Choose one: is this a bug report or feature request?
 var your => (code) => here;
 ```
 
-### Babel Configuration (.babelrc, package.json, cli command)
+### Babel/Babylon Configuration (.babelrc, package.json, cli command)
 <!--- If describing a bug, tell us what your babel configuration looks like -->
 
 ```js
@@ -57,6 +57,7 @@ var your => (code) => here;
 | software         | version(s)
 | ---------------- | -------
 | Babel            |  
+| Babylon          | <!-- This is only needed if you are using Babylon directly -->
 | node             | 
 | npm              | 
 | Operating System | 

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,21 +1,19 @@
-<!-- 
-Before making a PR please make sure to read our contributing guidelines 
+<!--
+Before making a PR please make sure to read our contributing guidelines
 https://github.com/babel/babel/blob/master/CONTRIBUTING.md
 
-For any 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
+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.
 -->
 
-| Q                        | A <!--(yes/no) -->
+| Q                        | A <!--(Can use an emoji 👍) -->
 | ------------------------ | ---
-| Patch: Bug Fix?          | 
-| Major: Breaking Change?  | 
-| Minor: New Feature?      | 
-| Deprecations?            | 
-| Spec Compliancy?         | 
-| Tests Added/Pass?        | 
-| Fixed Tickets            | `Fixes #1, Fixes #2` <!-- rm the quotes to link the issues -->
+| Fixed Issues?            | `Fixes #1, Fixes #2` <!-- remove the (`) quotes 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 -->
+| Any Dependency Changes?  |
 | License                  | MIT
-| Doc PR                   | <!-- if yes, add `[skip ci]` to your commit message to skip CI builds -->
-| Dependency Changes       | 
 
 <!-- Describe your changes below in as much detail as possible -->

.gitignore

@@ -3,11 +3,12 @@
 /packages/*/node_modules
 *.log
 *.cache
+/build
 /.eslintcache
 /browser.js
 /browser-polyfill.js
 /runtime.js
-/coverage
+coverage
 dist
 /.package.json
 package-lock.json
@@ -15,13 +16,31 @@ package-lock.json
 !/packages/babel-runtime/core-js/map.js
 /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-register/test/.babel
+/packages/babel-cli/test/tmp
+/packages/babel-node/test/tmp
 /packages/*/lib
 .nyc_output
 /babel.sublime-workspace
+packages/babel-standalone/babel.js
+packages/babel-standalone/babel.min.js
+packages/babel-preset-env-standalone/babel-preset-env.js
+packages/babel-preset-env-standalone/babel-preset-env.min.js
+/codemods/*/lib
+/codemods/*/node_modules
+/packages/babylon/build
+.idea/

.mention-bot

@@ -1,12 +0,0 @@
-{
-  "userBlacklist": [
-    "amasad",
-    "greenkeeperio-bot",
-    "jmm",
-    "kittens",
-    "thejameskyle"
-   ],
-  "fileBlacklist": ["*.md"],
-  "skipAlreadyAssignedPR": true,
-  "createReviewRequest": true
-}

.prettierignore

@@ -0,0 +1 @@
+package.json

.prettierrc

@@ -0,0 +1,23 @@
+{
+  "arrowParens": "avoid",
+  "trailingComma": "es5",
+  "useTabs": false,
+  "semi": true,
+  "singleQuote": false,
+  "bracketSpacing": true,
+  "jsxBracketSameLine": false,
+  "tabWidth": 2,
+  "parser": "babylon",
+  "printWidth": 80,
+  "overrides": [{
+    "files": [
+      "**/codemods/*/src/**/*.js",
+      "**/codemods/*/test/**/*.js",
+      "**/packages/*/src/**/*.js",
+      "**/packages/*/test/**/*.js"
+    ],
+    "options": {
+      "trailingComma": "all"
+    }
+  }]
+}

.travis.yml

@@ -7,22 +7,39 @@ cache:
   directories:
   - node_modules
 node_js:
+  # We test the latest version on circleci
   - '8'
   - '6'
-  - '4'
 
 env:
-  - JOB=test
+  global:
+    - PATH=$HOME/.yarn/bin:$PATH
+    - JOB=test
+
+before_install:
+  - curl -o- -L https://yarnpkg.com/install.sh | bash
+
+install: yarn --ignore-engines
+
+before_script:
+  - 'if [ "$JOB" = "babylon-flow-tests" ]; then make bootstrap-flow; fi'
+  - 'if [ "$JOB" = "babylon-test262-tests" ]; then make bootstrap-test262; 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'
 
 matrix:
   fast_finish: true
   include:
     - node_js: "node"
       env: JOB=lint
+    - node_js: "node"
+      env: JOB=babylon-flow-tests
+    - node_js: "node"
+      env: JOB=babylon-test262-tests
 
 notifications:
   slack:
@@ -33,3 +50,7 @@ notifications:
       #     travis encrypt "babeljs:<token>#activity" --add notifications.slack.rooms
       # where <token> is from the Slack integration settings.
       secure: SrwPKRe2AiNAKRo/+2yW/x4zxbWf2FBXuBuuPkdTJVTpWe++Jin1lXYJWTKP1a1i/IbmhffBO9YZcUFbeuXJpRM083vO8VYpyuBMQRqWD+Z3o+ttPlHGOJgnj0nkIcGRk6k7PpyHNnIkixfEJDvbbg9lN1Jswb3xkL8iYIHpuFE=
+
+branches:
+  except:
+    - /^v\d+\.\d+\.\d+$/

CHANGELOG.md

@@ -11,7 +11,95 @@
 
 _Note: Gaps between patch versions are faulty, broken or test releases._
 
-See [CHANGELOG - 6to5](CHANGELOG-6to5.md) for the pre-4.0.0 version changelog.
+See [CHANGELOG - 6to5](/.github/CHANGELOG-6to5.md) for the pre-4.0.0 version changelog.
+See [Babylon's CHANGELOG](packages/babylon/CHANGELOG.md) for the Babylon pre-7.0.0-beta.29 version changelog.
+
+## 6.26.0 (2017-08-16)
+
+> Backports for some folks (also other's when we accidently merged PRs from both 6.x/master)
+> Lesson learned: just use `master` and backport on another branch.
+
+#### :eyeglasses: Spec Compliancy
+* `babel-core`, `babel-generator`, `babel-plugin-transform-flow-comments`, `babel-plugin-transform-flow-strip-types`, `babel-traverse`, `babel-types`
+  * [#6081](https://github.com/babel/babel/pull/6081) Flow opaque type 6.x backport. ([@jbrown215](https://github.com/jbrown215))
+
+#### :rocket: New Feature
+* `babel-cli`
+  * [#5796](https://github.com/babel/babel/pull/5796) Allow --inspect-brk option to be used with babel-node [6.x backport]. ([@noinkling](https://github.com/noinkling))
+
+#### :bug: Bug Fix
+* `babel-plugin-transform-es2015-modules-commonjs`
+  * [#5811](https://github.com/babel/babel/pull/5811) Fix 5768. ([@joshwnj](https://github.com/joshwnj))
+  * [#5469](https://github.com/babel/babel/pull/5469) Fix commonjs exports with destructuring.. ([@yavorsky](https://github.com/yavorsky))
+* `babel-types`
+  * [#5693](https://github.com/babel/babel/pull/5693) Hoist toSequenceExpression's convert helper. ([@jridgewell](https://github.com/jridgewell))
+
+#### :memo: Documentation
+* `babel-plugin-transform-class-properties`
+  * [#6005](https://github.com/babel/babel/pull/6005) FIX access to the prototype of an instance. ([@shuaibird](https://github.com/shuaibird))
+* `babel-plugin-transform-runtime`
+  * [#5857](https://github.com/babel/babel/pull/5857) Fix typos in README.md. ([@danny-andrews](https://github.com/danny-andrews))
+* `babel-plugin-transform-regenerator`
+  * [#5852](https://github.com/babel/babel/pull/5852) Fix babel-plugin-transform-regenerator README. ([@k15a](https://github.com/k15a))
+* Other
+  * [#5788](https://github.com/babel/babel/pull/5788) Add a section on troubleshooting [skip ci]. ([@peey](https://github.com/peey))
+  * [#5755](https://github.com/babel/babel/pull/5755) Fix broken tables in README.md. ([@u9lyfish](https://github.com/u9lyfish))
+* `babel-generator`, `babel-plugin-transform-es2015-arrow-functions`, `babel-plugin-transform-es2015-modules-commonjs`, `babel-plugin-transform-es2015-spread`, `babel-plugin-transform-runtime`, `babel-register`
+  * [#5613](https://github.com/babel/babel/pull/5613) Backport doc changes. ([@xtuc](https://github.com/xtuc))
+
+#### :house: Internal
+* `babel-traverse`
+  * [#5965](https://github.com/babel/babel/pull/5965) Remove unused functions from renamer.js.. ([@mcav](https://github.com/mcav))
+  * [#5363](https://github.com/babel/babel/pull/5363) Increase the code coverage for traverse evaluation. ([@ssuman](https://github.com/ssuman))
+* Other
+  * [#5938](https://github.com/babel/babel/pull/5938) Remove codecov node package and use bash uploader. ([@existentialism](https://github.com/existentialism))
+
+#### Committers: 19
+- Artem Yavorsky ([yavorsky](https://github.com/yavorsky))
+- Brian Ng ([existentialism](https://github.com/existentialism))
+- Danny Andrews ([danny-andrews](https://github.com/danny-andrews))
+- Henry Zhu ([hzoo](https://github.com/hzoo))
+- Jeffrey Wear ([wearhere](https://github.com/wearhere))
+- Jordan Brown ([jbrown215](https://github.com/jbrown215))
+- Josh Johnston ([joshwnj](https://github.com/joshwnj))
+- Justin Ridgewell ([jridgewell](https://github.com/jridgewell))
+- Konstantin Pschera ([k15a](https://github.com/k15a))
+- Malcolm ([noinkling](https://github.com/noinkling))
+- Marcus Cavanaugh ([mcav](https://github.com/mcav))
+- Peeyush Kushwaha ([peey](https://github.com/peey))
+- Philipp Friedenberger ([MrSpider](https://github.com/MrSpider))
+- Samuel Reed ([STRML](https://github.com/STRML))
+- Shuaibird Hwang ([shuaibird](https://github.com/shuaibird))
+- Suman ([ssuman](https://github.com/ssuman))
+- Sven SAULEAU ([xtuc](https://github.com/xtuc))
+- jonathan schatz ([modosc](https://github.com/modosc))
+- u9lyfish@gmail.com ([u9lyfish](https://github.com/u9lyfish))
+
+## 6.25.0 (2017-06-08)
+
+Just backporting a few things.
+
+#### :rocket: New Feature
+* `babel-plugin-transform-react-display-name`
+  * [#5780](https://github.com/babel/babel/pull/5780) Backport support for createReactClass with transform-react-display-name. ([@kentor](https://github.com/kentor))
+  * [#5554](https://github.com/babel/babel/pull/5554) Updated transform-react-display-name for createReactClass addon. ([@bvaughn](https://github.com/bvaughn))
+* `babel-generator`, `babel-plugin-transform-flow-strip-types`, `babel-types`
+  * [#5653](https://github.com/babel/babel/pull/5653) Port flow object spread from #418 to 6.x. ([@kittens](https://github.com/kittens))
+
+#### :bug: Bug Fix
+* `babel-types`
+  * [#5770](https://github.com/babel/babel/pull/5770) Backport array & object pattern fixes to 6.x. ([@citycide](https://github.com/citycide))
+
+#### :nail_care: Polish
+* `babel-traverse`
+  * [#5615](https://github.com/babel/babel/pull/5615) Update deprecation warning on flow bindings. ([@kassens](https://github.com/kassens))
+
+#### Committers: 5
+- Bo Lingen ([citycide](https://github.com/citycide))
+- Brian Vaughn ([bvaughn](https://github.com/bvaughn))
+- Jan Kassens ([kassens](https://github.com/kassens))
+- Kenneth Chung ([kentor](https://github.com/kentor))
+- Sebastian McKenzie ([kittens](https://github.com/kittens))
 
 ## 6.24.0 (2017-03-13)
 
@@ -263,7 +351,7 @@ New/Expected Behavior
 
 ```js
 const _ref = foo(); // should only be called once
-const { x } = _ref; 
+const { x } = _ref;
 const y = _objectWithoutProperties(_ref, ["x"]);
 ```
 
@@ -279,7 +367,7 @@ function fn({a = 1, ...b} = {}) {
   return {a, b};
 }
 ```
-  
+
 * `babel-plugin-transform-es2015-destructuring`
   * [#5093](https://github.com/babel/babel/pull/5093) Ensure array is always copied during destructure. ([@existentialism](https://github.com/existentialism))
 
@@ -293,7 +381,7 @@ const arr = [1, 2, 3]
 assign(arr, 1, 42)
 console.log(arr) // [1, 2, 3]
 ```
-  
+
 * `babel-plugin-transform-es2015-function-name`
   * [#5008](https://github.com/babel/babel/pull/5008) Don't try to visit ArrowFunctionExpression, they cannot be named. ([@Kovensky](https://github.com/Kovensky))
 
@@ -308,9 +396,9 @@ Output
 
 ```js
 export const x = ({ x }) => x;
-export const y = function y() {}; 
+export const y = function y() {};
 ```
- 
+
 * `babel-types`
   * [#5068](https://github.com/babel/babel/pull/5068) Fix getBindingIdentifiers in babel-types. ([@rtsao](https://github.com/rtsao))
 * `babel-cli`
@@ -460,7 +548,7 @@ Will still error with `Spread children are not supported.`
 ```js
 <div>{...this.props.children}</div>;
 ```
-  
+
 * `babel-plugin-transform-es2015-block-scoping`, `babel-plugin-transform-react-constant-elements`, `babel-traverse`
   * [#4940](https://github.com/babel/babel/pull/4940) Fix React constant element bugs. ([@appden](https://github.com/appden))
 
@@ -469,7 +557,7 @@ When multiple declarators are present in a declaration, we want to insert the co
 ```js
 function render() {
   const bar = "bar", renderFoo = () => <foo bar={bar} baz={baz} />, baz = "baz";
-  
+
   return renderFoo();
 }
 ```
@@ -480,12 +568,12 @@ When block scoped variables caused the block to be wrapped in a closure, the var
 function render(flag) {
   if (flag) {
     let bar = "bar";
-    
+
     [].map(() => bar);
-    
+
     return <foo bar={bar} />;
   }
-    
+
   return null;
 }
 ```
@@ -526,7 +614,7 @@ for (let a of b) {
   * [#4999](https://github.com/babel/babel/pull/4999) babel-helper-transform-fixture-test-runner: pass require as a global. ([@hzoo](https://github.com/hzoo))
 
 Allows running `require()` in exec.js tests like for [babel/babel-preset-env#95](https://github.com/babel/babel-preset-env/pull/95)
-  
+
 * Other
   * [#5005](https://github.com/babel/babel/pull/5005) internal: don't run watch with the test env (skip building with code …. ([@hzoo](https://github.com/hzoo))
 
@@ -648,8 +736,8 @@ try {
     return x;
   };
 }
-```  
-  
+```
+
 * `babel-helper-remap-async-to-generator`, `babel-plugin-transform-async-generator-functions`, `babel-plugin-transform-async-to-generator`
   * [#4901](https://github.com/babel/babel/pull/4901) Only base async fn arity on non-default/non-rest params - Closes [#4891](https://github.com/babel/babel/issues/4891). ([@loganfsmyth](https://github.com/loganfsmyth))
 
@@ -660,7 +748,7 @@ console.log(foo.length)  // 0
 const asyncFoo = async (...args) => { }
 console.log(asyncFoo.length)  // 0
 ```
-  
+
 * `babel-generator`, `babel-types`
   * [#4945](https://github.com/babel/babel/pull/4945) Add `babel-generator` support for `Import`. ([@TheLarkInn](https://github.com/TheLarkInn))
 
@@ -669,14 +757,14 @@ console.log(asyncFoo.length)  // 0
 ```js
 import("module.js");
 ```
-  
+
 * `babel-plugin-transform-object-rest-spread`
   * [#4883](https://github.com/babel/babel/pull/4883) Fix for object-rest with parameters destructuring nested rest. ([@christophehurpeau](https://github.com/christophehurpeau))
 
 ```js
 function a5({a3, b2: { ba1, ...ba2 }, ...c3}) {}
-```  
- 
+```
+
 * `babel-traverse`
   * [#4875](https://github.com/babel/babel/pull/4875) Fix `path.evaluate` for references before declarations. ([@boopathi](https://github.com/boopathi))
 
@@ -981,7 +1069,7 @@ function render(_ref) {
 - Scott Stern ([sstern6](https://github.com/sstern6))
 - Shine Wang ([shinew](https://github.com/shinew))
 - lion ([lion-man44](https://github.com/lion-man44))
- 
+
 ## v6.18.2 (2016-11-01)
 
 Weird publishing issue with v6.18.1, same release.
@@ -1666,7 +1754,7 @@ export default {
 #### :bug: Bug Fix
 * `babel-helpers`, `babel-plugin-transform-es2015-typeof-symbol`
   * [#3686](https://github.com/babel/babel/pull/3686) Fix `typeof Symbol.prototype`. ([@brainlock](https://github.com/brainlock))
-  
+
 ```js
 // `typeof Symbol.prototype` should be 'object'
 typeof Symbol.prototype === 'object'
@@ -1675,7 +1763,7 @@ typeof Symbol.prototype === 'object'
 * `babel-cli`
   * [#3456](https://github.com/babel/babel/pull/3456) Use the real sourcemap API and handle input sourcemaps - Fixes [#7259](https://github.com/babel/babel/issues/7259). ([@loganfsmyth](https://github.com/loganfsmyth))
   * [#4507](https://github.com/babel/babel/pull/4507) Only set options in cli if different from default. ([@danez](https://github.com/danez))
-  
+
 Fix an issue with defaults not being overidden. This was causing options like `comments: false` not to work correctly.
 
   * [#4508](https://github.com/babel/babel/pull/4508) Support custom ports for V8 --inspect. ([@andykant](https://github.com/andykant))
@@ -1730,7 +1818,7 @@ We noticed that we can not make this optimizations if there are function calls o
 // was tranforming to
 x = a();
 y = obj.x;
-// now transforms to 
+// now transforms to
 var _ref = [a(), obj.x];
 x = _ref[0];
 y = _ref[1];
@@ -1796,7 +1884,7 @@ Cleanup tests, remove various unused dependencies, do not run CI with only readm
 #### Commiters: 20
 
 First PRs!
-- Alberto Piai ([brainlock](https://github.com/brainlock)) 
+- Alberto Piai ([brainlock](https://github.com/brainlock))
 - Andy Kant ([andykant](https://github.com/andykant))
 - Basil Hosmer ([bhosmer](https://github.com/bhosmer))
 - Bo Borgerson ([gigabo](https://github.com/gigabo))
@@ -1879,7 +1967,7 @@ npm install babel-preset-latest --save-dev
 { "presets": [
   ["latest", {
     "es2015": {
-      "modules": false 
+      "modules": false
     }
   }]
 ] }
@@ -2117,7 +2205,7 @@ Can be `false` to not transform modules, or one of `["amd", "umd", "systemjs", "
 
 ## v6.11.5 (2016-07-23)
 
-Thanks to Rob Eisenberg ([EisenbergEffect](https://github.com/EisenbergEffect)), Keyan Zhang ([keyanzhang](https://github.com/keyanzhang)), Rolf Timmermans ([rolftimmermans](https://github.com/rolftimmermans)), Thomas Grainger ([graingert](https://github.com/graingert)), 
+Thanks to Rob Eisenberg ([EisenbergEffect](https://github.com/EisenbergEffect)), Keyan Zhang ([keyanzhang](https://github.com/keyanzhang)), Rolf Timmermans ([rolftimmermans](https://github.com/rolftimmermans)), Thomas Grainger ([graingert](https://github.com/graingert)),
 
 we have  few fixes: fix `babel-register` file paths on error, infer class name for classes with class properties, fix `export *` to account for previously compiled modules.
 
@@ -2165,7 +2253,7 @@ In this release among other things are some more optimizations for babel-generat
 
 ## v6.11.3 (2016-07-13)
 
-The main fix is @loganfsmyth's changes of some parts in babel-generator in [#3565](https://github.com/babel/babel/pull/3565) to fix issues with exponential code generation times in certain cases. 
+The main fix is @loganfsmyth's changes of some parts in babel-generator in [#3565](https://github.com/babel/babel/pull/3565) to fix issues with exponential code generation times in certain cases.
 
 Items: the size of the array being generated
 Time: The time in ms to generate the code

CONTRIBUTING.md

@@ -1,5 +1,3 @@
-# NOTE: DO NOT OPEN ISSUES FOR QUESTIONS AND SUPPORT. SEE THE README FOR MORE INFO.
-
 ----
 
 <p align="center" class="toc">
@@ -19,32 +17,33 @@
 
 # Contributing
 
-> Before contributing, please read our [code of conduct](https://github.com/babel/babel/blob/master/CODE_OF_CONDUCT.md).
-
-Contributions are always welcome, no matter how large or small.
+Contributions are always welcome, no matter how large or small. Before
+contributing, please read the
+[code of conduct](https://github.com/babel/babel/blob/master/CODE_OF_CONDUCT.md).
 
 ## 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/babylon/blob/master/ast/spec.md) is a bit different from [ESTree](https://github.com/estree/estree). The differences are listed [here](https://github.com/babel/babylon#output).
+ - [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
-- 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/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22) and/or [beginner-friendly](https://github.com/babel/babel/issues?q=is%3Aissue+is%3Aopen+label%3A%22beginner-friendly%22).
+- 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](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)
 
 ## 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.js 4 and up but we develop using Node.js 6. Make sure you are on npm 3.
+Babel is built for Node 6 and up but we develop using Node 8 and yarn. You can check this with `node -v`.
 
-You can check this with `node -v` and `npm -v`.
-
-In addition, make sure that Yarn is installed.
+Make sure that Yarn is installed with version >= `0.28.0`.
 Installation instructions can be found here: https://yarnpkg.com/en/docs/install.
 
 ### Setup
@@ -114,12 +113,25 @@ To run tests for a specific package in [packages](https://github.com/babel/babel
 $ TEST_ONLY=babel-cli make test
 ```
 
+`TEST_ONLY` will also match substrings of the package name:
+
+```sh
+# Run tests for the @babel/plugin-transform-classes package.
+$ TEST_ONLY=babel-plugin-transform-classes make test
+```
+
 Use the `TEST_GREP` variable to run a subset of tests by name:
 
 ```sh
 $ TEST_GREP=transformation make test
 ```
 
+Substitute spaces for hyphens and forward slashes when targeting specific test names:
+
+```sh
+$ TEST_GREP="arrow functions destructuring parameters" make test
+```
+
 To enable the Node.js debugger added in v6.3.0, set the `TEST_DEBUG` environment variable:
 
 ```sh
@@ -128,6 +140,12 @@ $ 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
@@ -135,59 +153,58 @@ $ BABEL_ENV=cov make build
 $ ./scripts/test-cov.sh
 ```
 
-
 #### Troubleshooting Tests
 
-In case you're not able to reproduce an error on CI locally, it may be due to 
+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
- 
+
 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.
- 
+
 ### Writing tests
 
 Most packages in [`/packages`](https://github.com/babel/babel/tree/master/packages) have a `test` folder, however some tests might be in other packages or in [`/packages/babel-core`](https://github.com/babel/babel/tree/master/packages/babel-core/test/fixtures).
 
-#### `babel-plugin-x`
+#### `@babel/plugin-x`
 
 All the Babel plugins (and other packages) that have a `/test/fixtures` are written in a similar way.
 
-For example, in [`babel-plugin-transform-exponentiation-operator/test`](https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-exponentiation-operator/test):
+For example, in [`@babel/plugin-transform-exponentiation-operator/test`](https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-exponentiation-operator/test):
 
 - 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": ["transform-exponentiation-operator"] }`.
+   - 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 [`actual.js`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/binary/actual.js) file and an [`expected.js`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/binary/expected.js) file.
-   - If you need to expect an error, you can ignore creating the `expected.js` file and pass a new `throws` key to the `options.json` that contains the error string that is created.
+   - 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 an actual/expected test, you simply write out the code you want transformed in `actual.js`.
+In a fixture test, you simply write out the code you want transformed in `input.js`.
 
 ```js
-// actual.js
+// input.js
 2 ** 2;
 ```
 
-and the expected output after transforming it with your `options.json` in `expected.js`.
+and the expected output after transforming it with your `options.json` in `output.js`.
 
 ```js
-// expected.js
+// 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`
@@ -195,8 +212,8 @@ If you need to check for an error that is thrown you can add to the `options.jso
 ```js
 // options.json example
 {
-  "plugins": [["transform-object-rest-spread", { "useBuiltIns": "invalidOption" }]],
-  "throws": "transform-object-rest-spread currently only accepts a boolean option for useBuiltIns (defaults to false)"
+  "plugins": [["@babel/plugin-proposal-object-rest-spread", { "useBuiltIns": "invalidOption" }]],
+  "throws": "@babel/plugin-proposal-object-rest-spread currently only accepts a boolean option for useBuiltIns (defaults to false)"
 }
 ```
 
@@ -209,20 +226,45 @@ If the test requires a minimum Node version, you can add `minNodeVersion` (must
 }
 ```
 
+#### `babylon`
+
+Writing tests for Babylon is very
+similar to the other packages.
+Inside the `packages/babylon/tests/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.
+
+* 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:
+
+```sh
+$ make build
+```
+
+Then, to run the tests, use:
+
+```sh
+$ TEST_ONLY=babylon make test-only
+```
+
 #### Bootstrapping expected output
 
-For both `babel-plugin-x` and `babylon`, you can easily generate an `expected.js`/`expected.json` automatically by just providing `actual.js` and running the tests as you usually would.
+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.
 
 ```
 // Example
-- babylon
-  - test
-    - fixtures
-      - comments
-        - basic
-          - block-trailing-comment
-            - actual.js
-            - expected.json (will be generated if not created)
+- packages
+  - babylon
+    - test
+      - fixtures
+        - comments
+          - basic
+            - block-trailing-comment
+              - input.js
+              - output.json (will be generated if not created)
 ```
 
 ### Debugging code
@@ -244,7 +286,7 @@ To include the changes, we have to make sure to build Babel:
 $ make build
 ```
 
-Next, we need to execute `Generator.generate()`, which can be achieved by running a test case in the `babel-generator` package.
+Next, we need to execute `Generator.generate()`, which can be achieved by running a test case in the `@babel/generator` package.
 For example, we can run the test case that tests the generation of class declarations:
 
 ```bash
@@ -252,7 +294,6 @@ $ TEST_DEBUG=true TEST_GREP=ClassDeclaration make test-only
 
 ./scripts/test.sh
 Debugger listening on port 9229.
-Warning: This is an experimental feature and could change at any time.
 To start debugging, open the following URL in Chrome:
     chrome-devtools://devtools/remote/serve_file/@60cd6e859b9f557d2312f5bf532f6aec5f284980/inspector.html?experiments=true&v8only=true&ws=127.0.0.1:9229/3cdaebd2-be88-4e7b-a94b-432950ab72d0
 ```
@@ -261,10 +302,22 @@ To start the debugging in Chrome DevTools, open the given URL.
 The debugger starts at the first executed line of code, which is Mocha's first line by default.
 Click _Resume script execution_ <img src="https://i.imgur.com/TmYBn9d.png" alt="Resume script execution button." width="16"> to jump to the set breakpoint.
 Note that the code shown in Chrome DevTools is compiled code and therefore differs.
- 
+
+## Creating a new plugin (`spec-new`)
+
+> Example: https://github.com/babel/babylon/pull/541
+
+- 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)
+  - [ ] 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/babylon/blob/master/ast/spec.md))
-- Versioning ([doc/design/versioning.md](https://github.com/babel/babel/blob/master/doc/design/versioning.md)
+- AST spec ([babylon/ast/spec.md](https://github.com/babel/babel/blob/master/packages/babylon/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))
 - Compiler assumptions ([doc/design/compiler-assumptions.md](https://github.com/babel/babel/blob/master/doc/design/compiler-assumptions.md))

Gulpfile.js

@@ -7,11 +7,20 @@ const newer = require("gulp-newer");
 const babel = require("gulp-babel");
 const watch = require("gulp-watch");
 const gutil = require("gulp-util");
+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 rollupBabel = require("rollup-plugin-babel");
+const rollupNodeResolve = require("rollup-plugin-node-resolve");
+const registerStandalonePackageTask = require("./scripts/gulp-tasks")
+  .registerStandalonePackageTask;
 
-const base = path.join(__dirname, "packages");
-const scripts = "./packages/*/src/**/*.js";
+const sources = ["codemods", "packages"];
 
 function swapSrcWithLib(srcPath) {
   const parts = srcPath.split(path.sep);
@@ -19,43 +28,142 @@ function swapSrcWithLib(srcPath) {
   return parts.join(path.sep);
 }
 
+function getGlobFromSource(source) {
+  return `./${source}/*/src/**/*.js`;
+}
+
+function getIndexFromPackage(name) {
+  return `${name}/src/index.js`;
+}
+
+function compilationLogger(rollup) {
+  return through.obj(function(file, enc, callback) {
+    gutil.log(
+      `Compiling '${chalk.cyan(file.relative)}'${
+        rollup ? " with rollup " : ""
+      }...`
+    );
+    callback(null, file);
+  });
+}
+
+function errorsLogger() {
+  return plumber({
+    errorHandler(err) {
+      gutil.log(err.stack);
+    },
+  });
+}
+
+function rename(fn) {
+  return through.obj(function(file, enc, callback) {
+    file.path = fn(file);
+    callback(null, file);
+  });
+}
+
+function buildBabel(exclude) {
+  return merge(
+    sources.map(source => {
+      const base = path.join(__dirname, source);
+
+      let stream = gulp.src(getGlobFromSource(source), { base: base });
+
+      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));
+    })
+  );
+}
+
+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")));
+    })
+  );
+}
+
 gulp.task("default", ["build"]);
 
 gulp.task("build", function() {
-  return gulp
-    .src(scripts, { base: base })
-    .pipe(
-      plumber({
-        errorHandler: function(err) {
-          gutil.log(err.stack);
-        },
-      })
-    )
-    .pipe(
-      newer({
-        dest: base,
-        map: swapSrcWithLib,
-      })
-    )
-    .pipe(
-      through.obj(function(file, enc, callback) {
-        gutil.log("Compiling", "'" + chalk.cyan(file.relative) + "'...");
-        callback(null, file);
-      })
-    )
-    .pipe(babel())
-    .pipe(
-      through.obj(function(file, enc, callback) {
-        // Passing 'file.relative' because newer() above uses a relative path and this keeps it consistent.
-        file.path = path.resolve(file.base, swapSrcWithLib(file.relative));
-        callback(null, file);
-      })
-    )
-    .pipe(gulp.dest(base));
+  const bundles = ["packages/babylon"];
+
+  return merge([buildBabel(/* exclude */ bundles), buildRollup(bundles)]);
 });
 
-gulp.task("watch", ["build"], function() {
-  watch(scripts, { debounceDelay: 200 }, function() {
-    gulp.start("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
+);

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2014-2017 Sebastian McKenzie <sebmck@gmail.com>
+Copyright (c) 2014-2018 Sebastian McKenzie <sebmck@gmail.com>
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

Makefile

@@ -1,83 +1,159 @@
 MAKEFLAGS = -j1
-
-export NODE_ENV = test
+FLOW_COMMIT = f193e19cf2185006ea9139bb0e71f31ea93e7b72
+TEST262_COMMIT = 52f70e2f637731aae92a9c9a2d831310c3ab2e1e
 
 # Fix color output until TravisCI fixes https://github.com/travis-ci/travis-ci/issues/7967
 export FORCE_COLOR = true
 
+SOURCES = packages codemods
+
 .PHONY: build build-dist watch lint fix clean test-clean test-only test test-ci publish bootstrap
 
-build: clean
+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
+ifneq ("$(BABEL_COVERAGE)", "true")
+	make build-standalone
+	make build-preset-env-standalone
+endif
+
+build-standalone:
+	./node_modules/.bin/gulp build-babel-standalone
+
+build-preset-env-standalone:
+	./node_modules/.bin/gulp build-babel-preset-env-standalone
 
 build-dist: build
 	cd packages/babel-polyfill; \
 	scripts/build-dist.sh
 	cd packages/babel-runtime; \
 	node scripts/build-dist.js
-	node scripts/generate-babel-types-docs.js
 
-watch: clean
-	rm -rf packages/*/lib
+watch: clean clean-lib
+
+	# 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
 
-lint:
-	./node_modules/.bin/eslint scripts packages *.js --format=codeframe
-
 flow:
-	./node_modules/.bin/flow check
+	./node_modules/.bin/flow check --strip-root
+
+lint:
+	./node_modules/.bin/eslint scripts $(SOURCES) '*.js' '**/.*.js' --format=codeframe --rulesdir="./scripts/eslint_rules"
 
 fix:
-	./node_modules/.bin/eslint scripts packages *.js --format=codeframe --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"
 
 clean: test-clean
 	rm -rf packages/babel-polyfill/browser*
 	rm -rf packages/babel-polyfill/dist
-	# rm -rf packages/babel-runtime/helpers
-	# rm -rf packages/babel-runtime/core-js
 	rm -rf coverage
 	rm -rf packages/*/npm-debug*
 
 test-clean:
-	rm -rf packages/*/test/tmp
-	rm -rf packages/*/test-fixtures.json
-
-clean-all:
-	rm -rf packages/*/lib
-	rm -rf node_modules
-	rm -rf packages/*/node_modules
-	make clean
+	$(foreach source, $(SOURCES), \
+		$(call clean-source-test, $(source)))
 
 test-only:
-	./scripts/test.sh
+	BABEL_ENV=test ./scripts/test.sh
 	make test-clean
 
 test: lint test-only
 
-test-ci:
-	make bootstrap
-	make test-only
+test-ci: bootstrap test-only
 
 test-ci-coverage: SHELL:=/bin/bash
 test-ci-coverage:
-	BABEL_ENV=cov make bootstrap
-	./scripts/test-cov.sh
+	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
+	cd build/flow && git checkout $(FLOW_COMMIT)
+
+test-flow:
+	node scripts/tests/flow/run_babylon_flow_tests.js
+
+test-flow-ci: bootstrap test-flow
+
+test-flow-update-whitelist:
+	node scripts/tests/flow/run_babylon_flow_tests.js --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
+	cd build/test262 && git checkout $(TEST262_COMMIT)
+
+test-test262:
+	node scripts/tests/test262/run_babylon_test262.js
+
+test-test262-ci: bootstrap test-test262
+
+test-test262-update-whitelist:
+	node scripts/tests/test262/run_babylon_test262.js --update-whitelist
+
 publish:
 	git pull --rebase
-	rm -rf packages/*/lib
+	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=* --npm-tag=next --exact --skip-temp-tag
+	./node_modules/.bin/lerna publish --force-publish=* --exact --skip-temp-tag
 	make clean
 
-bootstrap:
-	make clean-all
-	yarn
-	./node_modules/.bin/lerna bootstrap
+bootstrap: clean-all
+	yarn --ignore-engines
+	./node_modules/.bin/lerna bootstrap -- --ignore-engines
 	make build
 	cd packages/babel-runtime; \
 	node scripts/build-dist.js
+
+clean-lib:
+	$(foreach source, $(SOURCES), \
+		$(call clean-source-lib, $(source)))
+
+clean-all:
+	rm -rf node_modules
+	rm -rf package-lock.json
+
+	$(foreach source, $(SOURCES), \
+		$(call clean-source-all, $(source)))
+
+	make clean
+
+define clean-source-lib
+	rm -rf $(1)/*/lib
+
+endef
+
+define clean-source-test
+	rm -rf $(1)/*/test/tmp
+	rm -rf $(1)/*/test-fixtures.json
+
+endef
+
+define clean-source-all
+	rm -rf $(1)/*/lib
+	rm -rf $(1)/*/node_modules
+	rm -rf $(1)/*/package-lock.json
+
+endef

NPM_OWNERS

@@ -1,6 +0,0 @@
-sebmck
-thejameskyle
-amasad
-hzoo
-loganfsmyth
-jmm

README.md

@@ -16,15 +16,72 @@
   <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>
 </p>
 
+<h2 align="center">Supporting Babel</h2>
+
 <p align="center">
   <a href="#backers"><img alt="Backers on Open Collective" src="https://opencollective.com/babel/backers/badge.svg" /></a>
   <a href="#sponsors"><img alt="Sponsors on Open Collective" src="https://opencollective.com/babel/sponsors/badge.svg" /></a>
-    <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>
+  <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 a community-driven tool that helps you write code in the latest version of JavaScript.
+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:
 
-When your supported environments don't support certain features natively, Babel will help you compile those features down to a supported version.
+- 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 (see below)!
+
+## Open Collective 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>
+
+## Patreon Sponsors
+
+Become a sponsor and get your logo on our README on Github with a link to your site. [[Become a sponsor](https://www.patreon.com/henryzhu)]
+
+## Gold
+
+<a href="https://vueschool.io/?babel" target="_blank"><img src="http://new.babeljs.io/img/sponsors/vueschool.png" height="64"></a>
+<a href="https://devrant.com/?babel" target="_blank"><img src="http://new.babeljs.io/img/sponsors/devRant.png" height="64"></a>
+
+## Bronze
+
+<a href="http://teamextension.io/" target="_blank"><img src="https://teamextension.io/dist/img/logo/te-logo-compact.png" height="64"></a>
+<a href="https://webflow.com/" target="_blank"><img src="https://opencollective.com/proxy/images/?src=https%3A%2F%2Fopencollective-production.s3-us-west-1.amazonaws.com%2F4a5024b0-8cf2-11e7-b1a2-b30b1de1463c.png&height=64"></a>
+<p><a href="https://twitter.com/mikesherov">Mike Sherov</a></p>
+
+## Intro
+
+Babel is a tool that helps you write code in the latest version of JavaScript. When your supported environments don't support certain features natively, Babel will help you compile those features down to a supported version.
 
 **In**
 
@@ -41,242 +98,43 @@ When your supported environments don't support certain features natively, Babel
 });
 ```
 
-Try it out at our [REPL](https://babeljs.io/repl/#?babili=false&evaluate=true&lineWrap=false&presets=latest&code=%5B1%2C2%2C3%5D.map(n%20%3D%3E%20n%20%2B%201)%3B&experimental=true&loose=true&spec=false&playground=false&stage=0) and follow us at [@babeljs](https://twitter.com/babeljs).
+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)
-- [Packages](#packages)
-  - [Core Packages](#core-packages)
-  - [Other](#other) 
-  - [Presets](#presets)
-  - [Plugins](#plugins)
-    - [Transform Plugins](#transform-plugins)
-    - [Syntax Plugins](#syntax-plugins)
-  - [Misc Packages](#misc-packages)
-- [Team](#team)
-- [License](#license)
+## FAQ
 
-# FAQ
+### Who maintains Babel?
 
-## Docs?
+Mostly a handful of volunteers! Please check out our [team page](https://babeljs.io/team)!
 
-Check out our website: [babeljs.io](http://babeljs.io/)
+### Looking for support?
 
-## Looking for support?
+For questions and support please visit 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).
 
-For questions and support please visit our [discussion forum](https://discuss.babeljs.io/), sign up for our [Slack community](https://slack.babeljs.io/), or [StackOverflow](http://stackoverflow.com/questions/tagged/babeljs).
+### Is there a Babel song?
 
-## Want to report a bug or request a feature?
+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!
 
-Bugs and feature requests can be posted at https://github.com/babel/babel/issues.
+### Where are the docs?
 
-> We've moved our issues from phabricator back to github issues!
+Check out our website: [babeljs.io](https://babeljs.io/), and report issues/features at [babel/website](https://github.com/babel/website/issues).
 
-Former phabricator issue URLs now automatically redirect to their corresponding Github issue:
+### Want to report a bug or request a feature?
 
-https://phabricator.babeljs.io/T2168 mostly corresponds to https://github.com/babel/babel/issues/2168.
+Please read through our [CONTRIBUTING.md](CONTRIBUTING.md) and fill out the issue template at [babel/issues](https://github.com/babel/babel/issues)!
 
-## Want to report an issue with [babeljs.io](https://babeljs.io) (the website)?
+### Want to contribute to Babel?
 
-For documentation and website issues please visit the [babel/babel.github.io](https://github.com/babel/babel.github.io) repo.
+Check out our [CONTRIBUTING.md](CONTRIBUTING.md) to get started with setting up the repo.
 
-## Want to contribute to Babel?
+- 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 discussions/notes/roadmap: [babel/notes](https://github.com/babel/notes)
+- Our progress on TC39 proposals: [babel/proposals](https://github.com/babel/proposals)
 
-Check out our [CONTRIBUTING.md](https://github.com/babel/babel/blob/master/CONTRIBUTING.md). If you have already joined Slack, join our [#development](https://babeljs.slack.com/messages/development) channel!
+### How is the repo structured?
 
-You can also start by checking out the issues with the [help-wanted](https://github.com/babel/babel/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22) label.
-
-Our discussions/notes/roadmap: [babel/notes](https://github.com/babel/notes)
-
-## Packages
-
-The Babel repo is managed as a [monorepo](https://github.com/babel/babel/blob/master/doc/design/monorepo.md) that is composed of many npm packages.
-
-### Core Packages
-
-| Package | Version | Dependencies |
-|--------|-------|------------|
-| [`babel-core`](/packages/babel-core) | [![npm](https://img.shields.io/npm/v/babel-core.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-core) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-core)](https://david-dm.org/babel/babel?path=packages/babel-core) |
-| [`babylon`](https://github.com/babel/babylon) | [![npm](https://img.shields.io/npm/v/babylon.svg?maxAge=2592000)](https://www.npmjs.com/package/babylon) | [![Dependency Status](https://david-dm.org/babel/babylon.svg)](https://david-dm.org/babel/babylon) |
-| [`babel-traverse`](/packages/babel-traverse) | [![npm](https://img.shields.io/npm/v/babel-traverse.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-traverse) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-traverse)](https://david-dm.org/babel/babel?path=packages/babel-traverse) |
-| [`babel-generator`](/packages/babel-generator) | [![npm](https://img.shields.io/npm/v/babel-generator.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-generator) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-generator)](https://david-dm.org/babel/babel?path=packages/babel-generator) |
-
-[`babel-core`](/packages/babel-core) is the Babel compiler itself; it exposes the `babel.transform` method, where `transformedCode = transform(src).code`.
-
-The compiler can be broken down into 3 parts:
-- The parser: [`babylon`](https://github.com/babel/babylon) (moved to a separate repo and versioned independently)
-- The transformer[s]: All the plugins/presets
-  - These all use [`babel-traverse`](/packages/babel-traverse) to traverse through the AST
-- The generator: [`babel-generator`](/packages/babel-generator)
-
-The flow goes like this:
-
-input string -> `babylon` parser -> `AST` -> transformer[s] -> `AST` -> `babel-generator` -> output string
-
-Check out the [`babel-handbook`](https://github.com/thejameskyle/babel-handbook/blob/master/translations/en/plugin-handbook.md#introduction) for more information on this.
-
-#### Other
-
-| Package | Version | Dependencies |
-|--------|-------|------------|
-| [`babel-cli`](/packages/babel-cli) | [![npm](https://img.shields.io/npm/v/babel-cli.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-cli) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-cli)](https://david-dm.org/babel/babel?path=packages/babel-cli) |
-| [`babel-types`](/packages/babel-types) | [![npm](https://img.shields.io/npm/v/babel-types.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-types) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-types)](https://david-dm.org/babel/babel?path=packages/babel-types) |
-| [`babel-polyfill`](/packages/babel-polyfill) | [![npm](https://img.shields.io/npm/v/babel-polyfill.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-polyfill) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-polyfill)](https://david-dm.org/babel/babel?path=packages/babel-polyfill) |
-| [`babel-runtime`](/packages/babel-runtime) | [![npm](https://img.shields.io/npm/v/babel-runtime.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-runtime) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-runtime)](https://david-dm.org/babel/babel?path=packages/babel-runtime) |
-| [`babel-register`](/packages/babel-register) | [![npm](https://img.shields.io/npm/v/babel-register.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-register) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-register)](https://david-dm.org/babel/babel?path=packages/babel-register) |
-| [`babel-template`](/packages/babel-template) | [![npm](https://img.shields.io/npm/v/babel-template.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-template) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-template)](https://david-dm.org/babel/babel?path=packages/babel-template) |
-| [`babel-helpers`](/packages/babel-helpers) | [![npm](https://img.shields.io/npm/v/babel-helpers.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-helpers) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-helpers)](https://david-dm.org/babel/babel?path=packages/babel-helpers) |
-| [`babel-code-frame`](/packages/babel-code-frame) | [![npm](https://img.shields.io/npm/v/babel-code-frame.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-code-frame) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-code-frame)](https://david-dm.org/babel/babel?path=packages/babel-code-frame) |
-
-- [`babel-cli`](/packages/babel-cli) is the CLI tool that runs `babel-core` and helps with outputting to a directory, a file, stdout and more (also includes `babel-node`). Check out the [docs](https://babeljs.io/docs/usage/cli/).
-- [`babel-types`](/packages/babel-types) is used to validate, build and change AST nodes.
-- [`babel-polyfill`](/packages/babel-polyfill) is [literally a wrapper](https://github.com/babel/babel/blob/master/packages/babel-polyfill/src/index.js) around [`core-js`](https://github.com/zloirock/core-js) and [regenerator-runtime](https://github.com/facebook/regenerator/tree/master/packages/regenerator-runtime). Check out the [docs](https://babeljs.io/docs/usage/polyfill/).
-- [`babel-runtime`](/packages/babel-runtime) is similar to the polyfill except that it doesn't modify the global scope and is to be used with [`babel-plugin-transform-runtime`](/packages/babel-plugin-transform-runtime) (usually in library/plugin code). Check out the [docs](https://babeljs.io/docs/plugins/transform-runtime/).
-- [`babel-register`](/packages/babel-register) is a way to automatically compile files with Babel on the fly by binding to Node.js `require`. Check out the [docs](http://babeljs.io/docs/usage/require/).
-- [`babel-template`](/packages/babel-template) is a helper function that allows constructing AST nodes from a string presentation of the code; this eliminates the tedium of using `babel-types` for building AST nodes.
-- [`babel-helpers`](/packages/babel-helpers) is a set of pre-made `babel-template` functions that are used in some Babel plugins.
-- [`babel-code-frame`](/packages/babel-code-frame) is a standalone package used to generate errors that print the source code and point to error locations.
-
-### [Presets](http://babeljs.io/docs/plugins/#presets)
-
-After Babel 6, the default transforms were removed; if you don't specify any plugins/presets, Babel will just return the original source code.
-
-The transformer[s] used in Babel are the independent pieces of code that transform specific things. For example: the [`es2015-arrow-functions`](/packages/babel-plugin-transform-es2015-arrow-functions) transform specifically changes arrow functions into regular functions. A preset is simply an array of plugins that make it easier to run a whole a set of transforms without specifying each one manually.
-
-| Package | Version | Dependencies | Description |
-|--------|-------|------------|---|
-| [`babel-preset-env`](https://github.com/babel/babel-preset-env) | [![npm](https://img.shields.io/npm/v/babel-preset-env.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-preset-env) | [![Dependency Status](https://david-dm.org/babel/babel-preset-env.svg)](https://david-dm.org/babel/babel-preset-env) | automatically determines plugins and polyfills you need based on your supported environments |
-
-> You can find community maintained presets on [npm](https://www.npmjs.com/search?q=babel-preset)
-
-### [Plugins](http://babeljs.io/docs/plugins)
-
-Plugins are the heart of Babel and what make it work.
-
-> You can find community plugins on [npm](https://www.npmjs.com/search?q=babel-plugin).
-
-#### Transform Plugins
-
-There are many kinds of plugins: ones that convert ES6/ES2015 to ES5, transform to ES3, minification, JSX, flow, experimental features, and more. Check out our [website for more](http://babeljs.io/docs/plugins/#transform-plugins).
-
-#### Syntax Plugins
-
-These just enable the transform plugins to be able to parse certain features (the transform plugins already include the syntax plugins so you don't need both): `babel-plugin-syntax-x`. Check out our [website for more](http://babeljs.io/docs/plugins/#syntax-plugins).
-
-### Helpers
-
-These are mostly for internal use in various plugins: `babel-helper-x`.
-
-## Team
-
-### Core members
-
-[![Babel](https://avatars.githubusercontent.com/u/9637642?s=64)](https://github.com/babel) | [![Daniel Tschinder](https://avatars.githubusercontent.com/u/231804?s=64)](https://github.com/danez) | [![Logan Smyth](https://avatars.githubusercontent.com/u/132260?s=64)](https://github.com/loganfsmyth) | [![Henry Zhu](https://avatars.githubusercontent.com/u/588473?s=64)](https://github.com/hzoo) | 
-|---|---|---|---|
-Babel | Daniel Tschinder | Logan Smyth | Henry Zhu |
-:octocat: [@babel](https://github.com/babel) | [@danez](https://github.com/danez) | [@loganfsmyth](https://github.com/loganfsmyth) | [@hzoo](https://github.com/hzoo) |
-:bird: [@babeljs](https://twitter.com/babeljs) | [@TschinderDaniel](https://twitter.com/TschinderDaniel) | [@loganfsmyth](https://twitter.com/loganfsmyth) | [@left_pad](https://twitter.com/left_pad) |
-
-### Members
-
-[![Andrew Levine](https://avatars.githubusercontent.com/u/5233399?s=64)](https://github.com/drewml) | [![Boopathi Rajaa](https://avatars.githubusercontent.com/u/294474?s=64)](https://github.com/boopathi) | [![Brian Ng](https://avatars.githubusercontent.com/u/56288?s=64)](https://github.com/existentialism) | [![Dan Harper](https://avatars.githubusercontent.com/u/510740?s=64)](https://github.com/danharper) | [![diogo franco](https://avatars.githubusercontent.com/u/73085?s=64)](https://github.com/kovensky) | [![Aaron Ang](https://avatars1.githubusercontent.com/u/7579804?s=64)](https://github.com/aaronang) | [![Artem Yavorsky](https://avatars2.githubusercontent.com/u/1521229?s=64)](https://github.com/yavorsky) |
-|---|---|---|---|---|---|---|
-| Andrew Levine | Boopathi Rajaa | Brian Ng | Dan Harper | Diogo Franco | Aaron Ang | Artem Yavorsky |
-| [@drewml](https://github.com/drewml) | [@boopathi](https://github.com/boopathi) | [@existentialism](https://github.com/existentialism) | [@danharper](https://github.com/danharper) | [@kovensky](https://github.com/kovensky) | [@aaronang](https://github.com/aaronang) | [@yavorsky](https://github.com/yavorsky) |
-| [@drewml](https://twitter.com/drewml) | [@heisenbugger](https://twitter.com/heisenbugger) | [@existentialism](https://twitter.com/existentialism) | [@DanHarper7](https://twitter.com/DanHarper7) | [@kovnsk](https://twitter.com/kovnsk) | [@_aaronang](https://twitter.com/_aaronang) | [@yavorsky_](https://twitter.com/yavorsky_) |
-
-[![Juriy Zaytsev](https://avatars.githubusercontent.com/u/383?s=64)](https://github.com/kangax) | [![Kai Cataldo](https://avatars.githubusercontent.com/u/7041728?s=64)](https://github.com/kaicataldo) | [![Moti Zilberman](https://avatars.githubusercontent.com/u/2246565?s=64)](https://github.com/motiz88) | [![Sven Sauleau](https://avatars3.githubusercontent.com/u/1493671?s=64)](https://github.com/xtuc) | [![Samuel Reed](https://avatars3.githubusercontent.com/u/1197375?s=64)](https://github.com/STRML) | [![Sergey Rubanov](https://avatars1.githubusercontent.com/u/1507086?s=64)](https://github.com/chicoxyzzy) |
-|---|---|---|---|---|---|
-| Juriy Zaytsev | Kai Cataldo | Moti Zilberman | Sven Sauleau | Samuel Reed | Sergey Rubanov |
-| [@kangax](https://github.com/kangax) | [@kaicataldo](https://github.com/kaicataldo) | [@motiz88](https://github.com/motiz88) | [@xtuc](https://github.com/xtuc) | [@STRML](https://github.com/STRML) | [@chicoxyzzy](https://github.com/chicoxyzzy) |
-| [@kangax](https://twitter.com/kangax) | [@kai_cataldo](https://twitter.com/kai_cataldo) | [@motiz88](https://twitter.com/motiz88) | [@svensauleau](https://twitter.com/svensauleau) | [@STRML_](https://twitter.com/STRML_) | [@chicoxyzzy](https://twitter.com/chicoxyzzy) |
-
-### Non-Human Members
-
-[<img src="https://github.com/babel/babel-bot/raw/master/babel-bot.png" height="64">](https://github.com/babel-bot) | 
-|---|
-| Babel Bot |
-| [@babel-bot](https://github.com/babel-bot) |
-| [@babeljs](https://twitter.com/babeljs) |
-
-### Inactive members
-
-[![Amjad Masad](https://avatars.githubusercontent.com/u/587518?s=64)](https://github.com/amasad) | [![James Kyle](https://avatars.githubusercontent.com/u/952783?s=64)](https://github.com/thejameskyle) | [![Jesse McCarthy](https://avatars.githubusercontent.com/u/129203?s=64)](https://github.com/jmm) | [![Sebastian McKenzie](https://avatars.githubusercontent.com/u/853712?s=64)](https://github.com/kittens) (Creator) | 
-|---|---|---|---|
-Amjad Masad | James Kyle | Jesse McCarthy | Sebastian McKenzie | 
-[@amasad](https://github.com/amasad) | [@thejameskyle](https://github.com/thejameskyle) | [@jmm](https://github.com/jmm) | [@sebmck](https://twitter.com/sebmck) |
-| [@amasad](https://twitter.com/amasad) | [@thejameskyle](https://twitter.com/thejameskyle) | [@mccjm](https://twitter.com/mccjm) | [@kittens](https://github.com/kittens) 
-
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-# Backers
-
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+The Babel repo is managed as a [monorepo](doc/design/monorepo.md) that is composed of many [npm packages](packages/README.md).
 
 ## License
 
-[MIT](https://github.com/babel/babel/blob/master/LICENSE)
+[MIT](LICENSE)

SONG.md

@@ -0,0 +1,67 @@
+## Hallelujah—In Praise of Babel
+
+I heard there was a clever trick  
+That rewrote all your JavaScript  
+But you don’t really care for magic, do you  
+Well it goes like this: the source, the dist  
+The ES five, the ES six  
+The sacred script transforming Hallelujah  
+
+Hallelujah, Hallelujah  
+Hallelujah, Hallelujah
+
+So I added all the shiny things  
+Classes, spreads and template strings  
+Through syntax sugared code I tried to woo you  
+Generators, const and let  
+I used them all without regret  
+And it’s a terse and a destructured Hallelujah  
+
+Hallelujah etc.
+
+Well my faith was strong but I needed proof  
+The standard was my source of truth  
+But TC39 meant nothing to you  
+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.
+
+Now you say the build step’s too complex  
+And you claim no need for ES Next  
+Well I used to think that way before I knew you  
+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.
+
+Yes I learned about the danger signs  
+How they’d polyfilled a thousand lines  
+The cost of using Maps and Symbols threw you  
+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.
+
+There was a time when they let me know  
+What’s really going on below  
+But now there’s only source maps there to school you  
+And debugging’s not a progress march  
+It’s a frenzied fumble in the dark  
+It’s a labyrinthine search for Hallelujah  
+
+Hallelujah etc.
+
+Well, maybe there’s a god up there  
+But all I ever got from prayers  
+Was broken builds and errors that would spook you  
+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.
+
+[Angus Croll](https://github.com/angus-c)  

babel.sublime-project

@@ -1,7 +1,7 @@
 {
     "settings": {
         "rulers": [
-            110
+            80
         ],
 
         // Set to false to disable detection of tabs vs. spaces on load

circle.yml

@@ -1,16 +0,0 @@
-machine:
-  node:
-    version:
-      6
-
-dependencies:
-  pre:
-    - curl -o- -L https://yarnpkg.com/install.sh | bash
-  cache_directories:
-    - ~/.yarn-cache
-  override:
-    - yarn
-
-test:
-  override:
-    - make test-ci-coverage

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

@@ -0,0 +1,59 @@
+# @babel/plugin-codemod-optional-catch-binding
+
+> If the argument bound to the catch block is not referenced in the catch block, that argument and the catch binding is removed.
+
+
+## Examples
+
+```js
+try {
+  throw 0;
+} catch (err) {
+  console.log("it failed, but this code executes");
+}
+```
+Is transformed to:
+
+```js
+try {
+  throw 0;
+} catch {
+  console.log("it failed, but this code executes");
+}
+```
+
+## Installation
+
+```sh
+npm install --save-dev @babel/plugin-codemod-optional-catch-binding
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["@babel/plugin-codemod-optional-catch-binding"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins @babel/plugin-codemod-optional-catch-binding script.js
+```
+
+### Via Node API
+
+```javascript
+require("@babel/core").transform("code", {
+  plugins: ["@babel/plugin-codemod-optional-catch-binding"]
+});
+```
+
+## References
+This codemod updates your source code in line with the following proposal:
+- [Proposal: Optional Catch Binding for ECMAScript](https://github.com/babel/proposals/issues/7)

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

@@ -0,0 +1,21 @@
+{
+  "name": "@babel/plugin-codemod-optional-catch-binding",
+  "version": "7.0.0-beta.45",
+  "description": "Remove unused catch bindings",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-remove-unused-catch-binding",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "@babel/plugin"
+  ],
+  "dependencies": {
+    "@babel/plugin-syntax-optional-catch-binding": "7.0.0-beta.45"
+  },
+  "peerDependencies": {
+    "@babel/core": "7.0.0-beta.45"
+  },
+  "devDependencies": {
+    "@babel/core": "7.0.0-beta.45",
+    "@babel/helper-plugin-test-runner": "7.0.0-beta.45"
+  }
+}

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

@@ -0,0 +1,24 @@
+import syntaxOptionalCatchBinding from "@babel/plugin-syntax-optional-catch-binding";
+import { types as t } from "@babel/core";
+
+export default function() {
+  return {
+    inherits: syntaxOptionalCatchBinding,
+
+    visitor: {
+      CatchClause(path) {
+        if (path.node.param === null || !t.isIdentifier(path.node.param)) {
+          return;
+        }
+        const binding = path.scope.getOwnBinding(path.node.param.name);
+        if (binding.constantViolations.length > 0) {
+          return;
+        }
+        if (!binding.referenced) {
+          const paramPath = path.get("param");
+          paramPath.remove();
+        }
+      },
+    },
+  };
+}

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

@@ -0,0 +1,5 @@
+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

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

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

@@ -0,0 +1,5 @@
+try {
+  throw 0;
+} catch {
+  console.log("it failed, but this code executes");
+}

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

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

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-block-null-binding/output.js

@@ -0,0 +1,5 @@
+try {
+  throw 0;
+} catch {
+  console.log("it failed, but this code executes");
+}

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

@@ -0,0 +1,5 @@
+try {
+  throw 0;
+} catch ([message]) {
+  console.log("it failed, but this code executes");
+}

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

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

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

@@ -0,0 +1,5 @@
+try {
+  throw 0;
+} catch ([message]) {
+  console.log("it failed, but this code executes");
+}

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

@@ -0,0 +1,5 @@
+try {
+  throw 0;
+} catch (err) {
+  console.log("it failed, but this code executes");
+}

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

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

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-block-unused-binding/output.js

@@ -0,0 +1,5 @@
+try {
+  throw 0;
+} catch {
+  console.log("it failed, but this code executes");
+}

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

@@ -0,0 +1,7 @@
+try {
+  throw 0;
+} catch ({
+  message
+}) {
+  console.log("it failed, but this code executes");
+}

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

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

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

@@ -0,0 +1,7 @@
+try {
+  throw 0;
+} catch ({
+  message
+}) {
+  console.log("it failed, but this code executes");
+}

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

@@ -0,0 +1,5 @@
+try {
+  throw 0;
+} catch ([message]) {
+  console.log(message);
+}

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

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

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

@@ -0,0 +1,5 @@
+try {
+  throw 0;
+} catch ([message]) {
+  console.log(message);
+}

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

@@ -0,0 +1,5 @@
+try {
+  throw 0;
+} catch (e) {
+  e = new TypeError('A new variable is not being declared or initialized; the catch binding is being referenced and cannot be removed.');
+}

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

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

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

@@ -0,0 +1,5 @@
+try {
+  throw 0;
+} catch (e) {
+  e = new TypeError('A new variable is not being declared or initialized; the catch binding is being referenced and cannot be removed.');
+}

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

@@ -0,0 +1,5 @@
+try {
+  throw 0;
+} catch (err) {
+  console.log(err, "it failed, but this code executes");
+}

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

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

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-block-used-binding/output.js

@@ -0,0 +1,5 @@
+try {
+  throw 0;
+} catch (err) {
+  console.log(err, "it failed, but this code executes");
+}

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

@@ -0,0 +1,7 @@
+try {
+  throw 0;
+} catch ({
+  message
+}) {
+  console.log(message);
+}

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

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

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

@@ -0,0 +1,7 @@
+try {
+  throw 0;
+} catch ({
+  message
+}) {
+  console.log(message);
+}

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-finally-unused-binding/input.js

@@ -0,0 +1,7 @@
+try {
+  throw 0;
+} catch (err) {
+  console.log("it failed, but this code executes");
+} finally {
+  console.log("this code also executes");
+}

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

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

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-finally-unused-binding/output.js

@@ -0,0 +1,7 @@
+try {
+  throw 0;
+} catch {
+  console.log("it failed, but this code executes");
+} finally {
+  console.log("this code also executes");
+}

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-finally-used-binding/input.js

@@ -0,0 +1,7 @@
+try {
+  throw 0;
+} catch (err) {
+  console.log(err, "it failed, but this code executes");
+} finally {
+  console.log("this code also executes");
+}

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

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

codemods/babel-plugin-codemod-optional-catch-binding/test/fixtures/codemod-optional-catch-binding/try-catch-finally-used-binding/output.js

@@ -0,0 +1,7 @@
+try {
+  throw 0;
+} catch (err) {
+  console.log(err, "it failed, but this code executes");
+} finally {
+  console.log("this code also executes");
+}

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

@@ -0,0 +1,3 @@
+import runner from "@babel/helper-plugin-test-runner";
+
+runner(__dirname);

doc/ast/spec.md

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

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

@@ -15,12 +15,13 @@ 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 ran together which finds bugs that touch multiple modules easier.
+ * Tests across modules are run together which finds bugs that touch multiple modules easier.
 
 **Cons:**
 
  * Codebase looks more intimidating.
  * Repo is bigger in size.
+ * [Can't `npm install` modules directly from GitHub](https://github.com/npm/npm/issues/2974)
  * ???
 
 ## This is dumb! Nobody in open source does this!

lerna.json

@@ -1,16 +1,16 @@
 {
   "lerna": "2.0.0-rc.4",
-  "version": "7.0.0-alpha.15",
+  "version": "7.0.0-beta.45",
   "changelog": {
     "repo": "babel/babel",
     "labels": {
-      "tag: spec compliancy": ":eyeglasses: Spec Compliancy",
-      "tag: breaking change": ":boom: Breaking Change",
-      "tag: new feature": ":rocket: New Feature",
-      "tag: bug fix": ":bug: Bug Fix",
-      "tag: polish": ":nail_care: Polish",
-      "tag: documentation": ":memo: Documentation",
-      "tag: internal": ":house: Internal"
+      "PR: Spec Compliancy :eyeglasses:": ":eyeglasses: Spec Compliancy",
+      "PR: Breaking Change :boom:": ":boom: Breaking Change",
+      "PR: New Feature :rocket:": ":rocket: New Feature",
+      "PR: Bug Fix :bug:": ":bug: Bug Fix",
+      "PR: Polish :nail_care:": ":nail_care: Polish",
+      "PR: Docs :memo:": ":memo: Documentation",
+      "PR: Internal :house:": ":house: Internal"
     }
   },
   "cacheDir": ".changelog",
@@ -18,8 +18,17 @@
     "publish": {
       "ignore": [
         "*.md",
-        "test/**"
+        "test/**",
+        "codemods/**"
       ]
     }
-  }
+  },
+  "packages": [
+    "packages/*",
+    "codemods/*"
+  ],
+  "npmClient": "yarn",
+  "npmClientArgs": [
+    "--no-lockfile"
+  ]
 }

lib/third-party-libs.js.flow

@@ -3,9 +3,9 @@
  */
 
 declare module "micromatch" {
-  declare function exports(Array<string>, Array<string>, ?{
-    nocase: boolean,
-  }): Array<string>;
+  declare module.exports: {
+    (Array<string>, Array<string>, ?{ nocase: boolean }): Array<string>,
+  };
 }
 
 declare module "resolve" {
@@ -31,3 +31,36 @@ declare module "lodash/clone" {
 declare module "lodash/merge" {
   declare export default <T: Object>(T, Object) => T;
 }
+
+declare module "convert-source-map" {
+  declare export type SourceMap = {
+    version: 3,
+    file: ?string,
+    sources: [?string],
+    sourcesContent: [?string],
+    names: [?string],
+    mappings: string,
+  };
+
+  declare class Converter {
+    toJSON(): string;
+    toBase64(): string;
+    toComment(): string;
+    toObject(): SourceMap
+  }
+
+  declare module.exports: {
+    SourceMap: SourceMap,
+    Converter: Converter,
+    fromObject(obj: SourceMap): Converter,
+    fromJSON(str: string): Converter,
+    fromBase64(str: string): Converter,
+    fromComment(str: string): Converter,
+    fromMapFileComment(str: string): Converter,
+    fromSource(str: string): Converter,
+    fromMapFileSource(str: string): Converter,
+    removeComments(str: string): string,
+    removeMapFileComments(str: string): string,
+    generateMapFileComment(path: string, options?: ?{ multiline: boolean }): string,
+  };
+}

package.json

@@ -10,62 +10,107 @@
     "test": "make test"
   },
   "devDependencies": {
-    "async": "^1.5.0",
-    "babel-cli": "7.0.0-alpha.12",
-    "babel-core": "7.0.0-alpha.12",
-    "babel-eslint": "8.0.0-alpha.12",
-    "babel-plugin-istanbul": "^2.0.1",
-    "babel-preset-env": "2.0.0-alpha.12",
-    "babel-preset-flow": "7.0.0-alpha.12",
-    "babel-preset-stage-0": "7.0.0-alpha.12",
-    "babel-register": "7.0.0-alpha.12",
+    "@babel/cli": "7.0.0-beta.44",
+    "@babel/core": "7.0.0-beta.44",
+    "@babel/plugin-transform-modules-commonjs": "7.0.0-beta.44",
+    "@babel/preset-env": "7.0.0-beta.44",
+    "@babel/preset-flow": "7.0.0-beta.44",
+    "@babel/preset-stage-0": "7.0.0-beta.44",
+    "@babel/register": "7.0.0-beta.44",
+    "babel-core": "^7.0.0-0",
+    "babel-eslint": "^8.0.1",
+    "babel-jest": "^22.4.1",
+    "babel-loader": "8.0.0-beta.0",
+    "babel-plugin-transform-charcodes": "^0.1.0",
+    "babylon": "7.0.0-beta.44",
     "browserify": "^13.1.1",
     "bundle-collapser": "^1.2.1",
-    "chai": "^3.5.0",
-    "chalk": "^1.1.1",
+    "chalk": "^2.3.2",
+    "charcodes": "^0.1.0",
     "derequire": "^2.0.2",
-    "eslint": "^3.14.1",
-    "eslint-config-babel": "^7.0.1",
+    "enhanced-resolve": "^3.0.0",
+    "eslint": "^4.18.2",
+    "eslint-config-babel": "^7.0.2",
     "eslint-plugin-flowtype": "^2.20.0",
-    "eslint-plugin-prettier": "^2.1.2",
-    "flow-bin": "^0.41.0",
+    "eslint-plugin-prettier": "^2.5.0",
+    "flow-bin": "^0.66.0",
+    "graceful-fs": "^4.1.11",
     "gulp": "^3.9.0",
-    "gulp-babel": "babel/gulp-babel#b7-alpha",
+    "gulp-babel": "^8.0.0-beta.2",
+    "gulp-filter": "^5.1.0",
     "gulp-newer": "^1.0.0",
     "gulp-plumber": "^1.0.1",
+    "gulp-rename": "^1.2.2",
+    "gulp-uglify": "^3.0.0",
     "gulp-util": "^3.0.7",
     "gulp-watch": "^4.3.5",
-    "husky": "^0.13.2",
-    "lerna": "2.0.0-rc.4",
-    "lerna-changelog": "^0.2.0",
-    "lint-staged": "^3.6.1",
+    "husky": "^0.14.3",
+    "jest": "^22.4.2",
+    "lerna": "2.0.0",
+    "lerna-changelog": "^0.5.0",
+    "lint-staged": "^6.0.1",
     "lodash": "^4.2.0",
-    "mocha": "^3.0.0",
-    "nyc": "^10.0.0",
-    "output-file-sync": "^1.1.1",
-    "prettier": "^1.5.0",
+    "merge-stream": "^1.0.1",
+    "output-file-sync": "^2.0.0",
+    "prettier": "1.11.1",
+    "pump": "^1.0.2",
     "rimraf": "^2.4.3",
-    "semver": "^5.0.0",
+    "rollup-plugin-babel": "^4.0.0-beta.0",
+    "rollup-plugin-node-resolve": "^3.0.2",
+    "rollup-stream": "^1.24.1",
+    "test262-stream": "^1.1.0",
     "through2": "^2.0.0",
-    "uglify-js": "^2.4.16"
+    "uglify-js": "^2.4.16",
+    "vinyl-buffer": "^1.0.1",
+    "vinyl-source-stream": "^2.0.0",
+    "webpack": "^3.4.1",
+    "webpack-dependency-suite": "^2.4.4",
+    "webpack-stream": "^4.0.0"
   },
   "engines": {
-    "node": ">= 4.x <= 8.x",
-    "npm": ">= 2.x <= 5.x"
-  },
-  "nyc": {
-    "all": true,
-    "exclude": [
-      "scripts/*.js",
-      "packages/*/test/**"
-    ],
-    "sourceMap": false,
-    "instrument": false
+    "node": ">= 6.x <= 9.x",
+    "npm": ">= 2.x <= 5.x",
+    "yarn": ">=0.27.5 || >=1.0.0-20170811"
   },
   "lint-staged": {
     "*.js": [
-      "eslint --format=codeframe --fix",
-      "git add"
+      "eslint --format=codeframe --rulesdir='./scripts/eslint_rules'"
+    ]
+  },
+  "jest": {
+    "collectCoverageFrom": [
+      "packages/*/src/**/*.mjs",
+      "packages/*/src/**/*.js",
+      "codemods/*/src/**/*.mjs",
+      "codemods/*/src/**/*.js"
+    ],
+    "testRegex": "./(packages|codemods)/[^/]+/test/.+\\.m?js$",
+    "testPathIgnorePatterns": [
+      "/node_modules/",
+      "/test/fixtures/",
+      "/test/debug-fixtures/",
+      "/babylon/test/expressions/",
+      "/test/tmp/",
+      "/test/__data__/",
+      "/test/helpers/",
+      "<rootDir>/test/warning\\.js",
+      "<rootDir>/build/",
+      "_browser\\.js"
+    ],
+    "testEnvironment": "node",
+    "setupTestFrameworkScriptFile": "<rootDir>/test/testSetupFile.js",
+    "transformIgnorePatterns": [
+      "/node_modules/",
+      "<rootDir>/packages/babel-standalone/babel(\\.min)?\\.js",
+      "<rootDir>/packages/babel-preset-env-standalone/babel-preset-env(\\.min)?\\.js",
+      "/test/(fixtures|tmp|__data__)/",
+      "<rootDir>/(packages|codemods)/[^/]+/lib/"
+    ],
+    "modulePathIgnorePatterns": [
+      "/test/fixtures/",
+      "/test/tmp/",
+      "/test/__data__/",
+      "<rootDir>/build/"
     ]
   }
 }

packages/.eslintrc

@@ -1,5 +0,0 @@
-{
-  "rules": {
-    "prettier/prettier": ["error", { "trailingComma": "all" }]
-  }
-}

packages/README.md

@@ -1,3 +1,85 @@
 # Woah, what's going on here?
 
 A monorepo, muhahahahahaha. See the [monorepo design doc](/doc/design/monorepo.md) for reasoning.
+
+- [Core Packages](#core-packages)
+- [Other](#other)
+- [Presets](#presets)
+- [Plugins](#plugins)
+  - [Transform Plugins](#transform-plugins)
+  - [Syntax Plugins](#syntax-plugins)
+
+### Core Packages
+
+| Package | Version | Dependencies |
+|--------|-------|------------|
+| [`@babel/core`](/packages/babel-core) | [![npm](https://img.shields.io/npm/v/@babel/core.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/core) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-core)](https://david-dm.org/babel/babel?path=packages/babel-core) |
+| [`babylon`](/packages/babylon) | [![npm](https://img.shields.io/npm/v/babylon.svg?maxAge=2592000)](https://www.npmjs.com/package/babylon) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babylon)](https://david-dm.org/babel/babel?path=packages/babylon) |
+| [`@babel/traverse`](/packages/babel-traverse) | [![npm](https://img.shields.io/npm/v/@babel/traverse.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/traverse) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-traverse)](https://david-dm.org/babel/babel?path=packages/babel-traverse) |
+| [`@babel/generator`](/packages/babel-generator) | [![npm](https://img.shields.io/npm/v/@babel/generator.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/generator) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-generator)](https://david-dm.org/babel/babel?path=packages/babel-generator) |
+
+[`@babel/core`](/packages/babel-core) is the Babel compiler itself; it exposes the `babel.transform` method, where `transformedCode = transform(src).code`.
+
+The compiler can be broken down into 3 parts:
+- The parser: [`babylon`](/packages/babylon)
+- The transformer[s]: All the plugins/presets
+  - These all use [`@babel/traverse`](/packages/babel-traverse) to traverse through the AST
+- The generator: [`@babel/generator`](/packages/babel-generator)
+
+The flow goes like this:
+
+input string -> `babylon` parser -> `AST` -> transformer[s] -> `AST` -> `@babel/generator` -> output string
+
+Check out the [`babel-handbook`](https://github.com/thejameskyle/babel-handbook/blob/master/translations/en/plugin-handbook.md#introduction) for more information on this.
+
+#### Other
+
+| Package | Version | Dependencies |
+|--------|-------|------------|
+| [`@babel/cli`](/packages/babel-cli) | [![npm](https://img.shields.io/npm/v/@babel/cli.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/cli) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-cli)](https://david-dm.org/babel/babel?path=packages/babel-cli) |
+| [`@babel/types`](/packages/babel-types) | [![npm](https://img.shields.io/npm/v/@babel/types.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/types) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-types)](https://david-dm.org/babel/babel?path=packages/babel-types) |
+| [`@babel/polyfill`](/packages/babel-polyfill) | [![npm](https://img.shields.io/npm/v/@babel/polyfill.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/polyfill) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-polyfill)](https://david-dm.org/babel/babel?path=packages/babel-polyfill) |
+| [`@babel/runtime`](/packages/babel-runtime) | [![npm](https://img.shields.io/npm/v/@babel/runtime.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/runtime) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-runtime)](https://david-dm.org/babel/babel?path=packages/babel-runtime) |
+| [`@babel/register`](/packages/babel-register) | [![npm](https://img.shields.io/npm/v/@babel/register.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/register) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-register)](https://david-dm.org/babel/babel?path=packages/babel-register) |
+| [`@babel/template`](/packages/babel-template) | [![npm](https://img.shields.io/npm/v/@babel/template.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/template) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-template)](https://david-dm.org/babel/babel?path=packages/babel-template) |
+| [`@babel/helpers`](/packages/babel-helpers) | [![npm](https://img.shields.io/npm/v/@babel/helpers.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/helpers) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-helpers)](https://david-dm.org/babel/babel?path=packages/babel-helpers) |
+| [`@babel/code-frame`](/packages/babel-code-frame) | [![npm](https://img.shields.io/npm/v/@babel/code-frame.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/code-frame) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-code-frame)](https://david-dm.org/babel/babel?path=packages/babel-code-frame) |
+
+- [`@babel/cli`](/packages/babel-cli) is the CLI tool that runs `@babel/core` and helps with outputting to a directory, a file, stdout and more (also includes `@babel/node` cli). Check out the [docs](https://babeljs.io/docs/usage/cli/).
+- [`@babel/types`](/packages/babel-types) is used to validate, build and change AST nodes.
+- [`@babel/polyfill`](/packages/babel-polyfill) is [literally a wrapper](/packages/babel-polyfill/src/index.js) around [`core-js`](https://github.com/zloirock/core-js) and [regenerator-runtime](https://github.com/facebook/regenerator/tree/master/packages/regenerator-runtime). Check out the [docs](https://babeljs.io/docs/usage/polyfill/).
+- [`@babel/runtime`](/packages/babel-runtime) is similar to the polyfill except that it doesn't modify the global scope and is to be used with [`@babel/plugin-transform-runtime`](/packages/babel-plugin-transform-runtime) (usually in library/plugin code). Check out the [docs](https://babeljs.io/docs/plugins/transform-runtime/).
+- [`@babel/register`](/packages/babel-register) is a way to automatically compile files with Babel on the fly by binding to Node.js `require`. Check out the [docs](http://babeljs.io/docs/usage/require/).
+- [`@babel/template`](/packages/babel-template) is a helper function that allows constructing AST nodes from a string presentation of the code; this eliminates the tedium of using `@babel/types` for building AST nodes.
+- [`@babel/helpers`](/packages/babel-helpers) is a set of pre-made `@babel/template` functions that are used in some Babel plugins.
+- [`@babel/code-frame`](/packages/babel-code-frame) is a standalone package used to generate errors that print the source code and point to error locations.
+
+### [Presets](http://babeljs.io/docs/plugins/#presets)
+
+After Babel 6, the default transforms were removed; if you don't specify any plugins/presets, Babel will just return the original source code.
+
+The transformer[s] used in Babel are the independent pieces of code that transform specific things. For example: the [`es2015-arrow-functions`](/packages/babel-plugin-transform-arrow-functions) transform specifically changes arrow functions into regular functions. A preset is simply an array of plugins that make it easier to run a whole a set of transforms without specifying each one manually.
+
+| Package | Version | Dependencies | Description |
+|--------|-------|------------|---|
+| [`@babel/preset-env`](/packages/babel-preset-env) | [![npm](https://img.shields.io/npm/v/@babel/preset-env.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/preset-env) | [![Dependency Status](https://david-dm.org/babel/babel/status.svg?path=packages/babel-preset-env)](https://david-dm.org/babel/babel?path=packages/babel-preset-env) | automatically determines plugins and polyfills you need based on your supported environments |
+
+> You can find community maintained presets on [npm](https://www.npmjs.com/search?q=babel-preset)
+
+### [Plugins](http://babeljs.io/docs/plugins)
+
+Plugins are the heart of Babel and what make it work.
+
+> You can find community plugins on [npm](https://www.npmjs.com/search?q=babel-plugin).
+
+#### Transform Plugins
+
+There are many kinds of plugins: ones that convert ES6/ES2015 to ES5, transform to ES3, minification, JSX, flow, experimental features, and more. Check out our [website for more](http://babeljs.io/docs/plugins/#transform-plugins).
+
+#### Syntax Plugins
+
+These just enable the transform plugins to be able to parse certain features (the transform plugins already include the syntax plugins so you don't need both): `@babel/plugin-syntax-x`. Check out our [website for more](http://babeljs.io/docs/plugins/#syntax-plugins).
+
+### Helpers
+
+These are mostly for internal use in various plugins: `@babel/helper-x`.

packages/babel-cli/README.md

@@ -1,18 +1,18 @@
-# babel-cli
+# @babel/cli
 
 > Babel command line.
- 
-In addition, various entry point scripts live in the top-level package at `babel-cli/bin`.
 
-There are some shell-executable utility scripts, `babel-external-helpers.js` and `babel-node.js`, and the main Babel cli script, `babel.js`.
+In addition, various entry point scripts live in the top-level package at `@babel/cli/bin`.
+
+There is a shell-executable utility script, `babel-external-helpers.js`, and the main Babel cli script, `babel.js`.
 
 ## Install
 
 ```sh
-npm install --save-dev babel-cli
+npm install --save-dev @babel/core @babel/cli
 ```
 
-## Usage 
+## Usage
 
 ```sh
 babel script.js

packages/babel-cli/bin/babel-doctor.js

@@ -1,3 +0,0 @@
-#!/usr/bin/env node
-
-throw new Error("babel-doctor has been removed.");

packages/babel-cli/index.js

@@ -1 +1 @@
-throw new Error("Use the `babel-core` package instead of `babel-cli`.");
+throw new Error("Use the `@babel/core` package instead of `@babel/cli`.");

packages/babel-cli/package.json

@@ -1,6 +1,6 @@
 {
-  "name": "babel-cli",
-  "version": "7.0.0-alpha.15",
+  "name": "@babel/cli",
+  "version": "7.0.0-beta.45",
   "description": "Babel command line.",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://babeljs.io/",
@@ -16,29 +16,27 @@
     "compiler"
   ],
   "dependencies": {
-    "babel-core": "7.0.0-alpha.15",
-    "babel-polyfill": "7.0.0-alpha.15",
-    "babel-register": "7.0.0-alpha.15",
     "commander": "^2.8.1",
     "convert-source-map": "^1.1.0",
     "fs-readdir-recursive": "^1.0.0",
     "glob": "^7.0.0",
     "lodash": "^4.2.0",
-    "output-file-sync": "^1.1.0",
+    "output-file-sync": "^2.0.0",
     "slash": "^1.0.0",
-    "source-map": "^0.5.0",
-    "v8flags": "^2.0.10"
+    "source-map": "^0.5.0"
   },
   "optionalDependencies": {
     "chokidar": "^1.6.1"
   },
+  "peerDependencies": {
+    "@babel/core": "7.0.0-beta.45"
+  },
   "devDependencies": {
-    "babel-helper-fixtures": "7.0.0-alpha.15"
+    "@babel/core": "7.0.0-beta.45",
+    "@babel/helper-fixtures": "7.0.0-beta.45"
   },
   "bin": {
-    "babel-doctor": "./bin/babel-doctor.js",
     "babel": "./bin/babel.js",
-    "babel-node": "./bin/babel-node.js",
     "babel-external-helpers": "./bin/babel-external-helpers.js"
   }
 }

packages/babel-cli/src/babel-external-helpers.js

@@ -1,5 +1,5 @@
 import commander from "commander";
-import { buildExternalHelpers } from "babel-core";
+import { buildExternalHelpers } from "@babel/core";
 
 function collect(value, previousValue): Array<string> {
   // If the user passed the option with no value, like "babel-external-helpers --whitelist", do nothing.

packages/babel-cli/src/babel/dir.js

@@ -6,56 +6,114 @@ import fs from "fs";
 
 import * as util from "./util";
 
+let compiledFiles = 0;
+
 export default function(commander, filenames, opts) {
-  function write(src, relative) {
+  function write(src, relative, base, callback) {
+    if (typeof base === "function") {
+      callback = base;
+      base = undefined;
+    }
     if (!util.isCompilableExtension(relative, commander.extensions)) {
-      return false;
+      return process.nextTick(callback);
     }
 
     // remove extension and then append back on .js
-    relative = relative.replace(/\.(\w*?)$/, "") + ".js";
+    relative = util.adjustRelative(relative, commander.keepFileExtension);
 
-    const dest = path.join(commander.outDir, relative);
+    const dest = getDest(commander, relative, base);
 
-    const data = util.compile(
+    util.compile(
       src,
       defaults(
         {
           sourceFileName: slash(path.relative(dest + "/..", src)),
-          sourceMapTarget: path.basename(relative),
         },
         opts,
       ),
+      function(err, res) {
+        if (err) return callback(err);
+        if (!res) return callback();
+
+        // we've requested explicit sourcemaps to be written to disk
+        if (
+          res.map &&
+          commander.sourceMaps &&
+          commander.sourceMaps !== "inline"
+        ) {
+          const mapLoc = dest + ".map";
+          res.code = util.addSourceMappingUrl(res.code, mapLoc);
+          res.map.file = path.basename(relative);
+          outputFileSync(mapLoc, JSON.stringify(res.map));
+        }
+
+        outputFileSync(dest, res.code);
+        util.chmod(src, dest);
+
+        compiledFiles += 1;
+
+        util.log(src + " -> " + dest);
+        return callback(null, true);
+      },
     );
-
-    if (!data) return false;
-
-    // we've requested explicit sourcemaps to be written to disk
-    if (data.map && commander.sourceMaps && commander.sourceMaps !== "inline") {
-      const mapLoc = dest + ".map";
-      data.code = util.addSourceMappingUrl(data.code, mapLoc);
-      outputFileSync(mapLoc, JSON.stringify(data.map));
-    }
-
-    outputFileSync(dest, data.code);
-    util.chmod(src, dest);
-
-    util.log(src + " -> " + dest);
-
-    return true;
   }
 
-  function handleFile(src, filename) {
-    const didWrite = write(src, filename);
+  function getDest(commander, filename, base) {
+    if (commander.relative) return path.join(base, commander.outDir, filename);
+    return path.join(commander.outDir, filename);
+  }
 
-    if (!didWrite && commander.copyFiles) {
-      const dest = path.join(commander.outDir, filename);
-      outputFileSync(dest, fs.readFileSync(src));
-      util.chmod(src, dest);
+  function outputDestFolder(outDir) {
+    const outDirPath = path.resolve(outDir);
+    if (!fs.existsSync(outDirPath)) {
+      fs.mkdirSync(outDirPath);
     }
   }
 
-  function handle(filename) {
+  function handleFile(src, filename, base, callback) {
+    if (typeof base === "function") {
+      callback = base;
+      base = undefined;
+    }
+
+    write(src, filename, base, function(err, res) {
+      if (err) return callback(err);
+      if (!res && commander.copyFiles) {
+        const dest = getDest(commander, filename, base);
+        outputFileSync(dest, fs.readFileSync(src));
+        util.chmod(src, dest);
+      }
+
+      return callback();
+    });
+  }
+
+  function sequentialHandleFile(files, dirname, index, callback) {
+    if (files.length === 0) {
+      outputDestFolder(commander.outDir);
+      return;
+    }
+
+    if (typeof index === "function") {
+      callback = index;
+      index = 0;
+    }
+
+    const filename = files[index];
+    const src = path.join(dirname, filename);
+
+    handleFile(src, filename, dirname, function(err) {
+      if (err) return callback(err);
+      index++;
+      if (index !== files.length) {
+        sequentialHandleFile(files, dirname, index, callback);
+      } else {
+        callback();
+      }
+    });
+  }
+
+  function handle(filename, callback) {
     if (!fs.existsSync(filename)) return;
 
     const stat = fs.statSync(filename);
@@ -63,17 +121,43 @@ export default function(commander, filenames, opts) {
     if (stat.isDirectory(filename)) {
       const dirname = filename;
 
-      util.readdir(dirname).forEach(function(filename) {
-        const src = path.join(dirname, filename);
-        handleFile(src, filename);
-      });
+      if (commander.deleteDirOnStart) {
+        util.deleteDir(commander.outDir);
+      }
+
+      const files = util.readdir(dirname, commander.includeDotfiles);
+      sequentialHandleFile(files, dirname, callback);
     } else {
-      write(filename, filename);
+      write(
+        filename,
+        path.basename(filename),
+        path.dirname(filename),
+        callback,
+      );
     }
   }
 
+  function sequentialHandle(filenames, index = 0) {
+    const filename = filenames[index];
+
+    handle(filename, function(err) {
+      if (err) throw new Error(err);
+      index++;
+      if (index !== filenames.length) {
+        sequentialHandle(filenames, index);
+      } else {
+        util.log(
+          `🎉  Successfully compiled ${compiledFiles} ${
+            compiledFiles > 1 ? "files" : "file"
+          } with Babel.`,
+          true,
+        );
+      }
+    });
+  }
+
   if (!commander.skipInitialBuild) {
-    filenames.forEach(handle);
+    sequentialHandle(filenames);
   }
 
   if (commander.watch) {
@@ -93,7 +177,9 @@ export default function(commander, filenames, opts) {
         watcher.on(type, function(filename) {
           const relative = path.relative(dirname, filename) || filename;
           try {
-            handleFile(filename, relative);
+            handleFile(filename, relative, function(err) {
+              if (err) throw err;
+            });
           } catch (err) {
             console.error(err.stack);
           }

packages/babel-cli/src/babel/file.js

@@ -16,7 +16,10 @@ export default function(commander, filenames, opts) {
 
   const buildResult = function() {
     const map = new sourceMap.SourceMapGenerator({
-      file: path.basename(commander.outFile || "") || "stdout",
+      file:
+        commander.sourceMapTarget ||
+        path.basename(commander.outFile || "") ||
+        "stdout",
       sourceRoot: opts.sourceRoot,
     });
 
@@ -103,19 +106,21 @@ export default function(commander, filenames, opts) {
     });
 
     process.stdin.on("end", function() {
-      results.push(
-        util.transform(
-          commander.filename,
-          code,
-          defaults(
-            {
-              sourceFileName: "stdin",
-            },
-            opts,
-          ),
+      util.transform(
+        commander.filename,
+        code,
+        defaults(
+          {
+            sourceFileName: "stdin",
+          },
+          opts,
         ),
+        function(err, res) {
+          if (err) throw err;
+          results.push(res);
+          output();
+        },
       );
-      output();
     });
   };
 
@@ -130,15 +135,19 @@ export default function(commander, filenames, opts) {
       if (stat.isDirectory()) {
         const dirname = filename;
 
-        util.readdirFilter(filename).forEach(function(filename) {
-          _filenames.push(path.join(dirname, filename));
-        });
+        util
+          .readdirForCompilable(filename, commander.includeDotfiles)
+          .forEach(function(filename) {
+            _filenames.push(path.join(dirname, filename));
+          });
       } else {
         _filenames.push(filename);
       }
     });
 
-    _filenames.forEach(function(filename) {
+    let filesProcessed = 0;
+
+    _filenames.forEach(function(filename, index) {
       let sourceFilename = filename;
       if (commander.outFile) {
         sourceFilename = path.relative(
@@ -148,7 +157,7 @@ export default function(commander, filenames, opts) {
       }
       sourceFilename = slash(sourceFilename);
 
-      const data = util.compile(
+      util.compile(
         filename,
         defaults(
           {
@@ -156,14 +165,18 @@ export default function(commander, filenames, opts) {
           },
           opts,
         ),
+        function(err, res) {
+          if (err) throw err;
+
+          filesProcessed++;
+          if (res) results[index] = res;
+
+          if (filesProcessed === _filenames.length) {
+            output();
+          }
+        },
       );
-
-      if (!data) return;
-
-      results.push(data);
     });
-
-    output();
   };
 
   const files = function() {

packages/babel-cli/src/babel/index.js

@@ -2,7 +2,7 @@
 
 import fs from "fs";
 import commander from "commander";
-import { version } from "babel-core";
+import { version } from "@babel/core";
 import uniq from "lodash/uniq";
 import glob from "glob";
 
@@ -32,7 +32,6 @@ function collect(value, previousValue): Array<string> {
   return previousValue ? previousValue.concat(values) : values;
 }
 
-/* eslint-disable max-len */
 // Standard Babel input configs.
 commander.option(
   "-f, --filename [filename]",
@@ -48,6 +47,12 @@ commander.option(
   "comma-separated list of plugin names",
   collect,
 );
+commander.option("--config-file [path]", "Path a to .babelrc file to use");
+commander.option(
+  "--env-name [name]",
+  "The name of the 'env' to use when loading configs and plugins. " +
+    "Defaults to the value of BABEL_ENV, or else NODE_ENV, or else 'development'.",
+);
 
 // Basic file input configuration.
 commander.option("--source-type [script|module]", "");
@@ -122,12 +127,16 @@ commander.option(
   "specify a custom name for module ids",
 );
 
-// "babel" command specific arguments that are not passed to babel-core.
+// "babel" command specific arguments that are not passed to @babel/core.
 commander.option(
   "-x, --extensions [extensions]",
   "List of extensions to compile when a directory has been input [.es6,.js,.es,.jsx,.mjs]",
   collect,
 );
+commander.option(
+  "--keep-file-extension",
+  "Preserve the file extensions of the input files",
+);
 commander.option("-w, --watch", "Recompile files on changes");
 commander.option(
   "--skip-initial-build",
@@ -141,14 +150,25 @@ commander.option(
   "-d, --out-dir [out]",
   "Compile an input directory of modules into an output directory",
 );
+commander.option(
+  "--relative",
+  "Compile into an output directory relative to input directory or file. Requires --out-dir [out]",
+);
 commander.option(
   "-D, --copy-files",
   "When compiling a directory copy over non-compilable files",
 );
-commander.option("-q, --quiet", "Don't log anything");
-/* eslint-enable max-len */
+commander.option(
+  "--include-dotfiles",
+  "Include dotfiles when compiling and copying non-compilable files",
+);
+commander.option("--verbose", "Log everything");
+commander.option(
+  "--delete-dir-on-start",
+  "Delete the out directory before compilation",
+);
 
-commander.version(pkg.version + " (babel-core " + version + ")");
+commander.version(pkg.version + " (@babel/core " + version + ")");
 commander.usage("[options] <files ...>");
 commander.parse(process.argv);
 
@@ -178,6 +198,10 @@ if (commander.outFile && commander.outDir) {
   errors.push("cannot have --out-file and --out-dir");
 }
 
+if (commander.relative && !commander.outDir) {
+  errors.push("output directory required for --relative");
+}
+
 if (commander.watch) {
   if (!commander.outFile && !commander.outDir) {
     errors.push("--watch requires --out-file or --out-dir");
@@ -191,6 +215,20 @@ if (commander.watch) {
 if (commander.skipInitialBuild && !commander.watch) {
   errors.push("--skip-initial-build requires --watch");
 }
+if (commander.deleteDirOnStart && !commander.outDir) {
+  errors.push("--delete-dir-on-start requires --out-dir");
+}
+
+if (
+  !commander.outDir &&
+  filenames.length === 0 &&
+  typeof commander.filename !== "string" &&
+  commander.babelrc !== false
+) {
+  errors.push(
+    "stdin compilation requires either -f/--filename [filename] or --no-babelrc",
+  );
+}
 
 if (errors.length) {
   console.error(errors.join(". "));
@@ -201,7 +239,7 @@ if (errors.length) {
 
 const opts = commander.opts();
 
-// Delete options that are specific to babel-cli and shouldn't be passed to babel-core.
+// Delete options that are specific to @babel/cli and shouldn't be passed to @babel/core.
 delete opts.version;
 delete opts.extensions;
 delete opts.watch;
@@ -209,10 +247,15 @@ delete opts.skipInitialBuild;
 delete opts.outFile;
 delete opts.outDir;
 delete opts.copyFiles;
-delete opts.quiet;
+delete opts.includeDotfiles;
+delete opts.verbose;
+delete opts.deleteDirOnStart;
+delete opts.keepFileExtension;
+delete opts.relative;
+delete opts.sourceMapTarget;
 
 // Commander will default the "--no-" arguments to true, but we want to leave them undefined so that
-// babel-core can handle the default-assignment logic on its own.
+// @babel/core can handle the default-assignment logic on its own.
 if (opts.babelrc === true) opts.babelrc = undefined;
 if (opts.comments === true) opts.comments = undefined;
 if (opts.highlightCode === true) opts.highlightCode = undefined;

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

@@ -1,6 +1,6 @@
 import commander from "commander";
-import readdir from "fs-readdir-recursive";
-import * as babel from "babel-core";
+import readdirRecursive from "fs-readdir-recursive";
+import * as babel from "@babel/core";
 import includes from "lodash/includes";
 import path from "path";
 import fs from "fs";
@@ -9,13 +9,26 @@ export function chmod(src, dest) {
   fs.chmodSync(dest, fs.statSync(src).mode);
 }
 
-export function readdirFilter(filename) {
-  return readdir(filename).filter(function(filename) {
-    return isCompilableExtension(filename);
-  });
+type ReaddirFilter = (filename: string) => boolean;
+
+export function readdir(
+  dirname: string,
+  includeDotfiles: boolean,
+  filter: ReaddirFilter,
+) {
+  return readdirRecursive(
+    dirname,
+    filename =>
+      (includeDotfiles || filename[0] !== ".") && (!filter || filter(filename)),
+  );
 }
 
-export { readdir };
+export function readdirForCompilable(
+  dirname: string,
+  includeDotfiles: boolean,
+) {
+  return readdir(dirname, includeDotfiles, isCompilableExtension);
+}
 
 /**
  * Test if a filename ends with a compilable extension.
@@ -33,41 +46,50 @@ export function addSourceMappingUrl(code, loc) {
   return code + "\n//# sourceMappingURL=" + path.basename(loc);
 }
 
-export function log(msg) {
-  if (!commander.quiet) console.log(msg);
+export function log(msg, force) {
+  if (force === true || commander.verbose) console.log(msg);
 }
 
-export function transform(filename, code, opts) {
+export function transform(filename, code, opts, callback) {
   opts = Object.assign({}, opts, {
     filename,
   });
 
-  return babel.transform(code, opts);
+  babel.transform(code, opts, callback);
 }
 
-export function compile(filename, opts) {
-  try {
-    return babel.transformFileSync(filename, opts);
-  } catch (err) {
-    if (commander.watch) {
-      console.error(toErrorStack(err));
-      return { ignored: true };
-    } else {
-      throw err;
+export function compile(filename, opts, callback) {
+  babel.transformFile(filename, opts, function(err, res) {
+    if (err) {
+      if (commander.watch) {
+        console.error(err);
+        return callback(null, null);
+      } else {
+        return callback(err);
+      }
     }
-  }
+    return callback(null, res);
+  });
 }
 
-function toErrorStack(err) {
-  if (err._babel && err instanceof SyntaxError) {
-    return `${err.name}: ${err.message}\n${err.codeFrame}`;
-  } else {
-    return err.stack;
+export function deleteDir(path) {
+  if (fs.existsSync(path)) {
+    fs.readdirSync(path).forEach(function(file) {
+      const curPath = path + "/" + file;
+      if (fs.lstatSync(curPath).isDirectory()) {
+        // recurse
+        deleteDir(curPath);
+      } else {
+        // delete file
+        fs.unlinkSync(curPath);
+      }
+    });
+    fs.rmdirSync(path);
   }
 }
 
 process.on("uncaughtException", function(err) {
-  console.error(toErrorStack(err));
+  console.error(err);
   process.exit(1);
 });
 
@@ -82,3 +104,10 @@ export function requireChokidar() {
     throw err;
   }
 }
+
+export function adjustRelative(relative, keepFileExtension) {
+  if (keepFileExtension) {
+    return relative;
+  }
+  return relative.replace(/\.(\w*?)$/, "") + ".js";
+}

packages/babel-cli/test/.othername_babelrc

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

packages/babel-cli/test/fixtures/babel-external-helpers/--whitelist/stdout.txt

@@ -1,21 +1,21 @@
 (function (global) {
   var babelHelpers = global.babelHelpers = {};
 
-  babelHelpers.createClass = function () {
-    function defineProperties(target, props) {
-      for (var i = 0; i < props.length; i++) {
-        var descriptor = props[i];
-        descriptor.enumerable = descriptor.enumerable || false;
-        descriptor.configurable = true;
-        if ("value" in descriptor) descriptor.writable = true;
-        Object.defineProperty(target, descriptor.key, descriptor);
-      }
+  function _defineProperties(target, props) {
+    for (var i = 0; i < props.length; i++) {
+      var descriptor = props[i];
+      descriptor.enumerable = descriptor.enumerable || false;
+      descriptor.configurable = true;
+      if ("value" in descriptor) descriptor.writable = true;
+      Object.defineProperty(target, descriptor.key, descriptor);
     }
+  }
 
-    return function (Constructor, protoProps, staticProps) {
-      if (protoProps) defineProperties(Constructor.prototype, protoProps);
-      if (staticProps) defineProperties(Constructor, staticProps);
-      return Constructor;
-    };
-  }();
+  function _createClass(Constructor, protoProps, staticProps) {
+    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
+    if (staticProps) _defineProperties(Constructor, staticProps);
+    return Constructor;
+  }
+
+  babelHelpers.createClass = _createClass;
 })(typeof global === "undefined" ? self : global);

packages/babel-cli/test/fixtures/babel/--config-file babelrc nocomment/options.json

@@ -0,0 +1,3 @@
+{
+  "args": ["--config-file", "../.othername_babelrc", "-f", "file.js"]
+}

packages/babel-cli/test/fixtures/babel/--config-file babelrc nocomment/stdin.txt

@@ -0,0 +1,7 @@
+/*
+ Test comment
+ */
+
+arr.map(x => x * MULTIPLIER);
+
+// END OF FILE

packages/babel-cli/test/fixtures/babel/--config-file babelrc nocomment/stdout.txt

@@ -0,0 +1,5 @@
+"use strict";
+
+arr.map(function (x) {
+  return x * MULTIPLIER;
+});

packages/babel-cli/test/fixtures/babel/--copy-files --include-dotfiles with ignore/in-files/src/foo/.foo.js

@@ -0,0 +1 @@
+a;

packages/babel-cli/test/fixtures/babel/--copy-files --include-dotfiles with ignore/in-files/src/foo/index.js

@@ -0,0 +1 @@
+bar;

packages/babel-cli/test/fixtures/babel/--copy-files --include-dotfiles with ignore/in-files/src/index.js

@@ -0,0 +1 @@
+index;

packages/babel-cli/test/fixtures/babel/--copy-files --include-dotfiles with ignore/options.json

@@ -0,0 +1,10 @@
+{
+  "args": [
+    "src",
+    "--out-dir", "lib",
+    "--copy-files",
+    "--include-dotfiles",
+    "--ignore", "src/foo",
+    "--verbose"
+  ]
+}

packages/babel-cli/test/fixtures/babel/--copy-files --include-dotfiles with ignore/out-files/lib/foo/.foo.js

@@ -0,0 +1 @@
+a;

packages/babel-cli/test/fixtures/babel/--copy-files --include-dotfiles with ignore/out-files/lib/foo/index.js

@@ -0,0 +1 @@
+bar;

packages/babel-cli/test/fixtures/babel/--copy-files --include-dotfiles with ignore/out-files/lib/index.js

@@ -0,0 +1,3 @@
+"use strict";
+
+index;

packages/babel-cli/test/fixtures/babel/--copy-files --include-dotfiles with ignore/stdout.txt

@@ -0,0 +1,2 @@
+src/index.js -> lib/index.js
+🎉  Successfully compiled 1 file with Babel.