v7.2.3

Use forked @lerna/collect-updates to prevent publishing of dependents:
this is the same as Lerna 2's --dangerously-only-publish-explicit-etc option.

.circleci/config.yml

@@ -34,7 +34,7 @@ jobs:
   build:
     working_directory: ~/babel
     docker:
-      - image: circleci/node:10
+      - image: circleci/node:11
     steps:
       - checkout
       - restore-cache: *restore-yarn-cache

.eslintrc.json

@@ -1,7 +1,7 @@
 {
   "root": true,
   "extends": "babel",
-  "plugins": ["local-rules", "prettier"],
+  "plugins": ["prettier", "@babel/development"],
   "rules": {
     "prettier/prettier": "error"
   },
@@ -12,8 +12,8 @@
     {
       "files": ["packages/*/src/**/*.js", "codemods/*/src/**/*.js"],
       "rules": {
-        "local-rules/no-undefined-identifier": "error",
-        "local-rules/no-deprecated-clone": "error"
+        "@babel/development/no-undefined-identifier": "error",
+        "@babel/development/no-deprecated-clone": "error"
       }
     },
     {
@@ -26,6 +26,13 @@
       "env": {
         "jest": true
       }
+    },
+    {
+      "files": ["packages/babel-plugin-*/src/index.js"],
+      "excludedFiles": ["packages/babel-plugin-transform-regenerator/**/*.js"],
+      "rules": {
+        "@babel/development/plugin-name": "error"
+      }
     }
   ]
 }

.flowconfig

@@ -1,11 +1,10 @@
 [ignore]
-.*/build/.*
-.*/packages/.*/lib
-.*/packages/.*/test
-.*/codemods/.*/lib
-.*/codemods/.*/test
-.*/node_modules/conventional-changelog-core/
-.*/node_modules/module-deps/
+<PROJECT_ROOT>/build/.*
+<PROJECT_ROOT>/packages/.*/lib
+<PROJECT_ROOT>/packages/.*/test
+<PROJECT_ROOT>/codemods/.*/lib
+<PROJECT_ROOT>/codemods/.*/test
+<PROJECT_ROOT>/node_modules/module-deps/
 
 [include]
 packages/*/src

.github/ISSUE_TEMPLATE/Bug_report.md

@@ -1,6 +1,9 @@
 ---
-name: 🐛 Bug Report
-about: If something isn't working as expected 🤔.
+name: "\U0001F41B Bug Report"
+about: "If something isn't working as expected \U0001F914."
+title: ''
+labels: 'i: bug, i: needs triage'
+assignees: ''
 
 ---
 
@@ -31,7 +34,7 @@ A clear and concise description of what you expected to happen (or code).
 - Babel version(s): [e.g. v6.0.0, v7.0.0-beta.34]
 - Node/npm version: [e.g. Node 8/npm 5]
 - OS: [e.g. OSX 10.13.4, Windows 10]
-- Monorepo [e.g. yes/no/Lerna]
+- Monorepo: [e.g. yes/no/Lerna]
 - How you are using Babel: [e.g. `cli`, `register`, `loader`]
 
 **Possible Solution**

.github/ISSUE_TEMPLATE/Feature_request.md

@@ -1,6 +1,9 @@
 ---
-name: 🚀 Feature Request
-about: I have a suggestion (and may want to implement it 🙂)!
+name: "\U0001F680 Feature Request"
+about: "I have a suggestion (and may want to implement it \U0001F642)!"
+title: ''
+labels: 'i: enhancement, i: needs triage'
+assignees: ''
 
 ---
 

.github/ISSUE_TEMPLATE/Regression-v7.md

@@ -1,12 +1,16 @@
 ---
-name: 💥 v7 Regression
-about: Report an unexpected behavior in v7 from v6 (Check the upgrade guide first ✌️)
+name: "\U0001F4A5 v7 Regression"
+about: Report an unexpected behavior in v7 from v6 (Check the upgrade guide first
+  ✌️)
+title: ''
+labels: 'i: bug, 7.x: regression, i: needs triage'
+assignees: ''
 
 ---
 
 # v7 Regression
 
-> First check out: https://new.babeljs.io/docs/en/next/v7-migration.html
+> First check out: https://babeljs.io/docs/en/v7-migration
 > Also a partial upgrade tool: https://github.com/babel/babel-upgrade
 
 **Potential Commit/PR that introduced the regression**

.github/ISSUE_TEMPLATE/Support_question.md

@@ -1,6 +1,9 @@
 ---
-name: 🤗 Support Question
-about: If you have a question 💬, please check out our Slack or StackOverflow!
+name: "\U0001F917 Support Question"
+about: "If you have a question \U0001F4AC, please check out our Slack or StackOverflow!"
+title: ''
+labels: 'i: question, i: needs triage'
+assignees: ''
 
 ---
 

.github/ISSUE_TEMPLATE/Support_us.md

@@ -1,6 +1,10 @@
 ---
-name: 🤝 Support us on Babel
-about: If you would like to support our efforts in maintaining this community-driven project 🙌!
+name: "\U0001F91D Support us on Babel"
+about: "If you would like to support our efforts in maintaining this community-driven
+  project \U0001F64C!"
+title: ''
+labels: ''
+assignees: ''
 
 ---
 

.travis.yml

@@ -1,14 +1,11 @@
 git:
-  depth: 10
-sudo: false
+  depth: 5
 language: node_js
 cache:
   yarn: true
-  directories:
-    - node_modules
 node_js:
   # We test the latest version on circleci
-  - '9'
+  - '10'
   - '8'
   - '6'
 
@@ -20,17 +17,20 @@ env:
 before_install:
   - curl -o- -L https://yarnpkg.com/install.sh | bash
 
-install: yarn --ignore-engines
+install:
+  # the `make test-ci` script runs this command already
+  - if [ "$JOB" != "test" ] && [ "$JOB" != "lint" ]; then yarn install; fi
+  - if [ "$JOB" = "lint" ]; then make bootstrap; fi
 
 before_script:
-  - 'if [ "$JOB" = "babel-parser-flow-tests" ]; then make bootstrap-flow; fi'
-  - 'if [ "$JOB" = "babel-parser-test262-tests" ]; then make bootstrap-test262; fi'
+  - if [ "$JOB" = "babel-parser-flow-tests" ]; then make bootstrap-flow; fi
+  - if [ "$JOB" = "babel-parser-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 [ "$JOB" = "babel-parser-flow-tests" ]; then make test-flow-ci; fi'
-  - 'if [ "$JOB" = "babel-parser-test262-tests" ]; then make test-test262-ci; fi'
+  - if [ "$JOB" = "test" ]; then make test-ci; fi
+  - if [ "$JOB" = "lint" ]; then make lint && make flow; fi
+  - if [ "$JOB" = "babel-parser-flow-tests" ]; then make test-flow-ci; fi
+  - if [ "$JOB" = "babel-parser-test262-tests" ]; then make test-test262-ci; fi
 
 matrix:
   fast_finish: true

CHANGELOG.md

@@ -15,6 +15,445 @@ See [CHANGELOG - v4](/.github/CHANGELOG-v4.md), [CHANGELOG - v5](/.github/CHANGE
 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.
 
+## v7.2.1 (2018-12-04)
+
+This release fixes a regression introduced in v7.2.0 (https://github.com/babel/babel/issues/9120)
+
+#### :bug: Bug Fix
+* `babel-helper-create-class-features-plugin`
+  * [#9121](https://github.com/babel/babel/pull/9121) Don't use isClassPrivateMethod because it isn't supported in <7.2.0. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+## v7.2.0 (2018-12-03)
+
+You can read more about this release at https://babeljs.io/blog/2018/12/03/7.2.0.
+
+#### :rocket: New Feature
+* `babel-parser`
+  * [#8289](https://github.com/babel/babel/pull/8289) Implement Smart Pipeline proposal in @babel/parser. ([@mAAdhaTTah](https://github.com/mAAdhaTTah))
+* `babel-core`
+  * [#8986](https://github.com/babel/babel/pull/8986) Export @babel/parser#tokTypes in @babel/core. ([@kaicataldo](https://github.com/kaicataldo))
+* `babel-node`
+  * [#9078](https://github.com/babel/babel/pull/9078) Pass `rootMode` from `@babel/node`.. ([@wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg))
+* `babel-generator`, `babel-helpers`, `babel-plugin-class-features`, `babel-plugin-proposal-private-methods`, `babel-plugin-syntax-class-properties`, `babel-types`
+  * [#8654](https://github.com/babel/babel/pull/8654) Private class methods stage 3. ([@tim-mc](https://github.com/tim-mc))
+* `babel-preset-env`
+  * [#9048](https://github.com/babel/babel/pull/9048) Update mappings for node 10 in preset-env. ([@existentialism](https://github.com/existentialism))
+
+#### :bug: Bug Fix
+* `babel-parser`
+  * [#9114](https://github.com/babel/babel/pull/9114) Parse non-octals with leading zeros in non strict mode correctly. ([@danez](https://github.com/danez))
+  * [#9074](https://github.com/babel/babel/pull/9074) Disallow await inside arrow functions. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+  * [#9069](https://github.com/babel/babel/pull/9069) [flow] Allow type casts in array patterns inside arrow parameters. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+  * [#9058](https://github.com/babel/babel/pull/9058) Fix compatibility between typescript and jsx plugins in interface declarations. ([@danez](https://github.com/danez))
+  * [#9055](https://github.com/babel/babel/pull/9055) Fix bug with parsing TS generic async arrow function. ([@existentialism](https://github.com/existentialism))
+  * [#9035](https://github.com/babel/babel/pull/9035) Fix parsing typescript function types with destructuring. ([@danez](https://github.com/danez))
+* `babel-helper-fixtures`, `babel-parser`
+  * [#9113](https://github.com/babel/babel/pull/9113) Ignore empty fixture directories and fix fixtures in the parser. ([@danez](https://github.com/danez))
+* `babel-preset-env`
+  * [#9091](https://github.com/babel/babel/pull/9091) Update mapping for regex unicode plugin in preset-env. ([@existentialism](https://github.com/existentialism))
+* `babel-plugin-transform-destructuring`
+  * [#8916](https://github.com/babel/babel/pull/8916) Fix destructuring assignment in arrow functions without block. ([@RubenVerborgh](https://github.com/RubenVerborgh))
+* `babel-plugin-proposal-optional-chaining`
+  * [#9073](https://github.com/babel/babel/pull/9073) Microbouji patch/8136. ([@jridgewell](https://github.com/jridgewell))
+* `babel-core`, `babel-helper-wrap-function`, `babel-plugin-proposal-async-generator-functions`, `babel-plugin-proposal-function-sent`, `babel-plugin-transform-async-to-generator`, `babel-plugin-transform-classes`
+  * [#9039](https://github.com/babel/babel/pull/9039) Fix recursive async function expressions. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-core`
+  * [#9034](https://github.com/babel/babel/pull/9034) Normalize presets before merging config with others.. ([@loganfsmyth](https://github.com/loganfsmyth))
+
+#### :nail_care: Polish
+* `babel-generator`
+  * [#9089](https://github.com/babel/babel/pull/9089) Remove unused variable. ([@Gcaufy](https://github.com/Gcaufy))
+* `babel-node`
+  * [#9079](https://github.com/babel/babel/pull/9079) Move `fs-readdir-recursive` and `output-file-sync` to `devDependencies` for `@babel/node`.. ([@wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg))
+* `babel-parser`
+  * [#9046](https://github.com/babel/babel/pull/9046) a better error message for disallowed trailing commas/additional parameters after rest elements in function params. ([@morozRed](https://github.com/morozRed))
+* `babel-*`
+  * [#8769](https://github.com/babel/babel/pull/8769) Add plugins name. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+#### :house: Internal
+* `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-class-properties`, `babel-plugin-proposal-private-methods`
+  * [#9083](https://github.com/babel/babel/pull/9083) Make @babel/plugin-class-features a normal helper package. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* Other
+  * [#9096](https://github.com/babel/babel/pull/9096) Add node 11 to CI and remove node 9. ([@danez](https://github.com/danez))
+  * [#9094](https://github.com/babel/babel/pull/9094) Skip minifying standalone in non-publish runs. ([@danez](https://github.com/danez))
+* `babel-types`
+  * [#9093](https://github.com/babel/babel/pull/9093) Fix warning when using prettier in code generators. ([@danez](https://github.com/danez))
+* `babel-generator`
+  * [#9089](https://github.com/babel/babel/pull/9089) Remove unused variable. ([@Gcaufy](https://github.com/Gcaufy))
+
+## v7.1.6 (2018-11-13)
+
+#### :bug: Bug Fix
+* `babel-generator`
+  * [#9003](https://github.com/babel/babel/pull/9003) Fix retainLines regression for arrow functions. ([@loganfsmyth](https://github.com/loganfsmyth))
+* `babel-types`
+  * [#8997](https://github.com/babel/babel/pull/8997) Fix cloneNode with typeAnnotation.. ([@neoziro](https://github.com/neoziro))
+* `babel-plugin-transform-flow-strip-types`, `babel-plugin-transform-react-jsx`
+  * [#8701](https://github.com/babel/babel/pull/8701) Fix "TypeError: comments is not iterable". ([@AlicanC](https://github.com/AlicanC))
+* `babel-core`
+  * [#9004](https://github.com/babel/babel/pull/9004) Fix browser files to have the same API as the nodejs ones. ([@danez](https://github.com/danez))
+* Other
+  * [#9007](https://github.com/babel/babel/pull/9007) [Types] fix generated TS/Flow comment types. ([@ljqx](https://github.com/ljqx))
+* `babel-preset-env`
+  * [#8555](https://github.com/babel/babel/pull/8555) preset-env: fix `opera` from `esmodules` target and Browserslist not used. ([@ylemkimon](https://github.com/ylemkimon))
+* `babel-plugin-proposal-decorators`, `babel-traverse`
+  * [#8970](https://github.com/babel/babel/pull/8970) [decorators] Correctly insert `_initialize(this)` after `super()`.. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-parser`
+  * [#8972](https://github.com/babel/babel/pull/8972) Fix several edge cases with context expression state. ([@danez](https://github.com/danez))
+
+#### :nail_care: Polish
+* `babel-parser`
+  * [#8984](https://github.com/babel/babel/pull/8984) Rename primitive types to reserved types. ([@danez](https://github.com/danez))
+
+#### :house: Internal
+* [#8982](https://github.com/babel/babel/pull/8982) fix publish command [skip ci]. ([@hzoo](https://github.com/hzoo))
+* [#8988](https://github.com/babel/babel/pull/8988) Remove definition of micromatch which was removed.. ([@danez](https://github.com/danez))
+
+## v7.1.5 (2018-11-06)
+
+#### :eyeglasses: Spec Compliancy
+* `babel-parser`, `babylon`
+  * [#7727](https://github.com/babel/babel/pull/7727) Fix await in function name and parameters. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+#### :rocket: New Feature
+* `babel-parser`
+  * [#8828](https://github.com/babel/babel/pull/8828) Typescript: Validate tuple type element positions. ([@Retsam](https://github.com/Retsam))
+  * [#8883](https://github.com/babel/babel/pull/8883) [flow] Add support for parsing `_` as implicit instantiation in call/new. ([@jbrown215](https://github.com/jbrown215))
+* `babel-core`, `babel-generator`, `babel-parser`, `babel-plugin-syntax-typescript`, `babel-traverse`
+  * [#8448](https://github.com/babel/babel/pull/8448) Remove Babylon plugins for features already merged to the ECMAScript spec. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-parser`, `babel-types`
+  * [#8884](https://github.com/babel/babel/pull/8884) [flow] Explicit inexact objects with `...`. ([@jbrown215](https://github.com/jbrown215))
+* `babel-preset-env`
+  * [#8898](https://github.com/babel/babel/pull/8898) Update preset-env data. ([@existentialism](https://github.com/existentialism))
+
+#### :bug: Bug Fix
+* `babel-parser`
+  * [#8956](https://github.com/babel/babel/pull/8956) Do not allow TypeCastExpressions w/o parens . ([@danez](https://github.com/danez))
+  * [#8954](https://github.com/babel/babel/pull/8954) Allow function types in type params within arrow return types. ([@danez](https://github.com/danez))
+  * [#8866](https://github.com/babel/babel/pull/8866) Closes [#8865](https://github.com/babel/babel/issues/8865). ([@byronluk](https://github.com/byronluk))
+* `babel-core`
+  * [#8910](https://github.com/babel/babel/pull/8910) Resolve babel.config.js 'babelrcRoots' values relative to the config file.. ([@loganfsmyth](https://github.com/loganfsmyth))
+  * [#8950](https://github.com/babel/babel/pull/8950) Fix message when plugin of a wrong type is passed. ([@everdimension](https://github.com/everdimension))
+* `babel-plugin-transform-block-scoping`
+  * [#8937](https://github.com/babel/babel/pull/8937) rename colliding let bindings with for loop init. ([@byronluk](https://github.com/byronluk))
+  * [#8914](https://github.com/babel/babel/pull/8914) Treat break inside block inside loop. ([@thiagoarrais](https://github.com/thiagoarrais))
+* `babel-preset-env`
+  * [#8926](https://github.com/babel/babel/pull/8926) preset-env: Edge support for arrow param destructuring. ([@benmosher](https://github.com/benmosher))
+* `babel-generator`
+  * [#8868](https://github.com/babel/babel/pull/8868) fix single-arg async arrows when retainLines=true. ([@ryanwmarsh](https://github.com/ryanwmarsh))
+* `babel-traverse`
+  * [#8880](https://github.com/babel/babel/pull/8880) fix: Expression x === 'y' && '' should not evaluate to undefined.. ([@Cyp](https://github.com/Cyp))
+
+#### :nail_care: Polish
+* [#8873](https://github.com/babel/babel/pull/8873) fixed an extra word. ([@vvyomjjain](https://github.com/vvyomjjain))
+
+## v7.1.4 (2018-10-11)
+
+Just re-published `@babel/traverse` without `**` so that it works in Node 6.
+
+## v7.1.3 (2018-10-11)
+
+#### :bug: Bug Fix
+* `babel-generator`, `babel-parser`, `babel-plugin-transform-typescript`, `babel-types`
+  * [#8720](https://github.com/babel/babel/pull/8720) Typescript - Tuple elements can be optional. ([@Retsam](https://github.com/Retsam))
+* `babel-traverse`
+  * [#8833](https://github.com/babel/babel/pull/8833) Insertafter jsx fix. ([@kevintab95](https://github.com/kevintab95))
+* `babel-parser`
+  * [#8830](https://github.com/babel/babel/pull/8830) Correct handling of newline after async with paren-less arrow func. ([@Retsam](https://github.com/Retsam))
+  * [#8756](https://github.com/babel/babel/pull/8756) class private methods and properties: should not allow spaces between # and identifier. ([@macabeus](https://github.com/macabeus))
+  * [#8804](https://github.com/babel/babel/pull/8804) Fix parsing of slash after class expression. ([@existentialism](https://github.com/existentialism))
+  * [#8767](https://github.com/babel/babel/pull/8767) [decorators] [typescript] Parse type parameters. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+  * [#8792](https://github.com/babel/babel/pull/8792) Fix perf issue in typescript parser plugin. ([@matthewrobertson](https://github.com/matthewrobertson))
+* `babel-generator`, `babel-parser`, `babel-plugin-transform-typescript`, `babel-types`
+  * [#8805](https://github.com/babel/babel/pull/8805) Typescript - Tuples can include rest elements. ([@Retsam](https://github.com/Retsam))
+* `babel-types`
+  * [#8791](https://github.com/babel/babel/pull/8791) types: allow jsxEmptyExpression inside jsxExpressionContainer. ([@tvooo](https://github.com/tvooo))
+* `babel-plugin-transform-modules-systemjs`
+  * [#8820](https://github.com/babel/babel/pull/8820) System module format - fixes function hoisting failure case. ([@guybedford](https://github.com/guybedford))
+* `babel-plugin-transform-destructuring`
+  * [#8793](https://github.com/babel/babel/pull/8793) Ensure destructuring's computed key handling matches object-rest-spread. ([@existentialism](https://github.com/existentialism))
+
+## 7.1.2 (2018-09-28)
+
+Same as v7.1.1, except compiled against Node 6 instead of Node 8 by accident (e.g had `async functions`).
+
+## v7.1.1 (2018-09-28)
+
+> EDIT: had a publish issue here as well where it compiled against Node 8 instead of Node 6 so 7.1.2 will fix this.
+> Also force publish `@babel/runtime` and `@babel/runtime-corejs2`. We need to fix the publishing around that since Lerna doesn't pickup the `@babel/helpers` changes as there is no "dependency"
+
+#### :bug: Bug Fix
+* `babel-generator`, `babel-parser`, `babel-types`
+  * [#8755](https://github.com/babel/babel/pull/8755) TypeScript: reserve `unknown` as TSUnknownKeyword. ([@g-plane](https://github.com/g-plane))
+* `babel-plugin-transform-destructuring`
+  * [#8535](https://github.com/babel/babel/pull/8535)  Do not unpack array patterns that update a referenced binding. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-plugin-proposal-decorators`
+  * [#8742](https://github.com/babel/babel/pull/8742) [decorators] Support async and generator methods. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-helpers`, `babel-plugin-proposal-decorators`
+  * [#8761](https://github.com/babel/babel/pull/8761) [decorators] Fields are enumerable. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-generator`
+  * [#8751](https://github.com/babel/babel/pull/8751) Fix some missing parens cases with OptionalMemberExpression in generator. ([@existentialism](https://github.com/existentialism))
+  * [#8727](https://github.com/babel/babel/pull/8727) Handle throw expressions in generator. ([@existentialism](https://github.com/existentialism))
+
+#### :house: Internal
+* Other
+  * [#8780](https://github.com/babel/babel/pull/8780) Run test262 tests for exportNamespaceFrom. ([@existentialism](https://github.com/existentialism))
+* `babel-helper-transform-fixture-test-runner`
+  * [#8768](https://github.com/babel/babel/pull/8768) Use babel-check-duplicated-nodes. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+## v7.1.0 (2018-09-17)
+
+Check http://babeljs.io/blog/2018/09/17/7.1.0
+
+#### :rocket: New Feature
+* `babel-cli`, `babel-core`
+  * [#8660](https://github.com/babel/babel/pull/8660) Better support monorepos by allowing users to opt into automatically resolving 'root' with `rootMode: "upward"`.. ([@loganfsmyth](https://github.com/loganfsmyth))
+* `babel-helper-transform-fixture-test-runner`
+  * [#7582](https://github.com/babel/babel/pull/7582) Allow regular plugins/presets resolution algorithm for packages outsi…. ([@Andarist](https://github.com/Andarist))
+* `babel-helpers`, `babel-plugin-proposal-decorators`, `babel-plugin-syntax-decorators`
+  * [#7976](https://github.com/babel/babel/pull/7976) Add support for the new decorators proposal. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-helpers`, `babel-plugin-proposal-class-properties`
+  * [#8205](https://github.com/babel/babel/pull/8205) Private Static Fields Features: Stage 3. ([@rricard](https://github.com/rricard))
+
+#### :bug: Bug Fix
+* `babel-parser`
+  * [#8698](https://github.com/babel/babel/pull/8698) Fix parsing of newline between 'async' and 'function'. ([@existentialism](https://github.com/existentialism))
+  * [#8677](https://github.com/babel/babel/pull/8677) Fix typescript parsing typed object shorthand methods. ([@existentialism](https://github.com/existentialism))
+* `babel-plugin-transform-typescript`
+  * [#8682](https://github.com/babel/babel/pull/8682) Fix TSParameterProperty getting lost with transform-classes. ([@existentialism](https://github.com/existentialism))
+  * [#8695](https://github.com/babel/babel/pull/8695) Adjust TSParameterProperty handling to work with transform-parameters. ([@existentialism](https://github.com/existentialism))
+  * [#8666](https://github.com/babel/babel/pull/8666) Fix typescript import elision. ([@Retsam](https://github.com/Retsam))
+* `babel-preset-env`
+  * [#8693](https://github.com/babel/babel/pull/8693) Fix es6.string.iterator mapping in babel-preset-env. ([@existentialism](https://github.com/existentialism))
+* `babel-core`, `babel-plugin-proposal-class-properties`, `babel-plugin-proposal-decorators`, `babel-plugin-transform-runtime`
+  * [#8659](https://github.com/babel/babel/pull/8659) Fix version checks in .availableHelper and transform-runtime definitions.. ([@loganfsmyth](https://github.com/loganfsmyth))
+* Other
+  * [#8627](https://github.com/babel/babel/pull/8627) ts generator: allow reserved keywords in interfaces. ([@43081j](https://github.com/43081j))
+* `babel-plugin-transform-parameters`
+  * [#8414](https://github.com/babel/babel/pull/8414) Allow patterns as argument of RestElement. ([@microbouji](https://github.com/microbouji))
+* `babel-core`, `babel-plugin-transform-runtime`
+  * [#8624](https://github.com/babel/babel/pull/8624) Verify 'sourceMap' option with hasOwnProperty, and verify string-typed 'version'. ([@loganfsmyth](https://github.com/loganfsmyth))
+* `babel-helpers`, `babel-plugin-proposal-class-properties`
+  * [#8614](https://github.com/babel/babel/pull/8614) [static private] Unify loose handling of static and instance props. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+#### :nail_care: Polish
+* `babel-plugin-transform-runtime`
+  * [#8581](https://github.com/babel/babel/pull/8581) Fix grammar in error message at @babel/plugin-transform-runtime. ([@tricknotes](https://github.com/tricknotes))
+* `babel-parser`
+  * [#8576](https://github.com/babel/babel/pull/8576) More helpful errorr message for missing decoratorsBeforeExport in parser. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+#### :memo: Documentation
+* [#8561](https://github.com/babel/babel/pull/8561) Added pronounciation of babel. ([@siddhant1](https://github.com/siddhant1))
+
+#### :house: Internal
+* `babel-core`
+  * [#8714](https://github.com/babel/babel/pull/8714) Fix Flow error with new versionRange test.. ([@loganfsmyth](https://github.com/loganfsmyth))
+* Other
+  * [#8679](https://github.com/babel/babel/pull/8679) remove force publish, temp tag [skip ci]. ([@hzoo](https://github.com/hzoo))
+* `babel-plugin-transform-runtime`
+  * [#8661](https://github.com/babel/babel/pull/8661) Makefile: run fix json on fix. ([@xtuc](https://github.com/xtuc))
+* `babel-*`
+  * [#8658](https://github.com/babel/babel/pull/8658) Format fixture options.json with Prettier.. ([@loganfsmyth](https://github.com/loganfsmyth))
+* `babel-parser`
+  * [#8630](https://github.com/babel/babel/pull/8630) Bump flow to 0.80 and fix sourceType error. ([@existentialism](https://github.com/existentialism))
+  * [#8610](https://github.com/babel/babel/pull/8610) types: missing `unambiguous` sourceType. ([@xtuc](https://github.com/xtuc))
+  * [#8170](https://github.com/babel/babel/pull/8170) @babel/parser: expose a TypeScript definition file from package. ([@AviVahl](https://github.com/AviVahl))
+* `babel-*`
+  * [#8573](https://github.com/babel/babel/pull/8573) add access public to all packages [skip ci]. ([@hzoo](https://github.com/hzoo))
+
+## v7.0.1 (2018-09-11)
+
+Doing a quick patch regarding helpers versioning to prevent future issues: https://github.com/babel/babel/pull/8659
+
+## v7.0.0 (2018-08-27)
+
+No change from rc.4. Finally released as https://babeljs.io/blog/2018/08/27/7.0.0!
+
+## v7.0.0-rc.4 (2018-08-27)
+
+> Similar to removing proposals in `@babel/polyfill`, we are removing them in `transform-runtime`
+
+#### :boom: Breaking Change
+* `babel-plugin-transform-runtime`
+  * [#8547](https://github.com/babel/babel/pull/8547) Remove nonstandard functions and fake prototype methods from babel-runtime. ([@loganfsmyth](https://github.com/loganfsmyth))
+* `babel-parser`
+  * [#8539](https://github.com/babel/babel/pull/8539) Update parser whitespace for clarity. ([@jridgewell](https://github.com/jridgewell))
+
+#### :bug: Bug Fix
+* `babel-register`
+  * [#8553](https://github.com/babel/babel/pull/8553) bump source-map-support. ([@hzoo](https://github.com/hzoo))
+* `babel-core`
+  * [#8546](https://github.com/babel/babel/pull/8546) Default highlightCode:true for the parser highlighting.. ([@loganfsmyth](https://github.com/loganfsmyth))
+
+#### :house: Internal
+* Other
+  * [#8554](https://github.com/babel/babel/pull/8554) Lerna: remove exact [skip ci]. ([@hzoo](https://github.com/hzoo))
+* `babel-parser`
+  * [#8540](https://github.com/babel/babel/pull/8540) Cleanup getLineInfo. ([@jridgewell](https://github.com/jridgewell))
+  * [#8541](https://github.com/babel/babel/pull/8541) Update to ES6 String methods. ([@jridgewell](https://github.com/jridgewell))
+  * [#8537](https://github.com/babel/babel/pull/8537) Flatten TokenType class hierarchy. ([@jridgewell](https://github.com/jridgewell))
+  * [#8539](https://github.com/babel/babel/pull/8539) Update parser whitespace for clarity. ([@jridgewell](https://github.com/jridgewell))
+
+## v7.0.0-rc.3 (2018-08-24)
+
+#### :boom: Breaking Change
+* `babel-preset-env`
+  * [#8509](https://github.com/babel/babel/pull/8509) Add browserslist 4 support.. ([@yavorsky](https://github.com/yavorsky))
+* `babel-plugin-transform-runtime`
+  * [#8518](https://github.com/babel/babel/pull/8518) Make 'useESModules' only toggle CJS vs ESM helpers when importing file is ESM.. ([@loganfsmyth](https://github.com/loganfsmyth))
+
+#### :rocket: New Feature
+* `babel-plugin-transform-runtime`
+  * [#8520](https://github.com/babel/babel/pull/8520) Expose opt-in useESModules:"auto" from transform-runtime to toggle based on 'supportsStaticESM'. ([@loganfsmyth](https://github.com/loganfsmyth))
+
+#### :bug: Bug Fix
+* `babel-helpers`, `babel-plugin-transform-classes`, `babel-preset-env`
+  * [#8501](https://github.com/babel/babel/pull/8501) [_wrapNativeSuper] Don't wrap non-native constructors. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-generator`, `babel-traverse`, `babel-types`
+  * [#8478](https://github.com/babel/babel/pull/8478) Fix path.scope.rename() to not change break clauses. ([@rafeca](https://github.com/rafeca))
+* `babel-plugin-proposal-object-rest-spread`
+  * [#8514](https://github.com/babel/babel/pull/8514) fix: object rest with default values bug. ([@jquense](https://github.com/jquense))
+* `babel-traverse`
+  * [#8505](https://github.com/babel/babel/pull/8505) Rename exported functions where name conflicts with param.. ([@loganfsmyth](https://github.com/loganfsmyth))
+
+#### :house: Internal
+* `babel-plugin-transform-object-set-prototype-of-to-assign`
+  * [#8409](https://github.com/babel/babel/pull/8409) Add LICENSE file to published npm packages [skip ci]. ([@opichals](https://github.com/opichals))
+* Other
+  * [#8504](https://github.com/babel/babel/pull/8504) Update Babel to rc.2. ([@hzoo](https://github.com/hzoo))
+
+## v7.0.0-rc.2 (2018-08-21)
+
+A notable change is the addition of https://github.com/babel/babel/pull/8485 which enables https://github.com/babel/babel-loader/pull/660 (automatically doing `modules: false` for `@babel/preset-env` when using `babel-loader`. 
+
+#### :boom: Breaking Change
+* `babel-core`
+  * [#8470](https://github.com/babel/babel/pull/8470) Remove File#resolveModuleSource. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+  * [#8473](https://github.com/babel/babel/pull/8473) Allow babel-plugin/preset prefix to not be a prefix, when used in a scope.. ([@loganfsmyth](https://github.com/loganfsmyth))
+* `babel-core`, `babel-parser`, `babel-plugin-syntax-decorators`
+  * [#8465](https://github.com/babel/babel/pull/8465) Require decoratorsBeforeExport option for decorators. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+#### :rocket: New Feature
+* `babel-preset-env`
+  * [#8500](https://github.com/babel/babel/pull/8500) Add missing es7.promise.finally polyfill when using useBuiltIns: usage. ([@jsnajdr](https://github.com/jsnajdr))
+* `babel-cli`, `babel-core`, `babel-node`, `babel-preset-env`, `babel-register`
+  * [#8485](https://github.com/babel/babel/pull/8485) Allow preset-env to toggle module handling based on flags from the caller (like babel-loader). ([@loganfsmyth](https://github.com/loganfsmyth))
+* `babel-core`
+  * [#8474](https://github.com/babel/babel/pull/8474) Preserve 'false'-options for disabled plugins/presets.. ([@loganfsmyth](https://github.com/loganfsmyth))
+  * [#8473](https://github.com/babel/babel/pull/8473) Allow babel-plugin/preset prefix to not be a prefix, when used in a scope.. ([@loganfsmyth](https://github.com/loganfsmyth))
+* `babel-helper-transform-fixture-test-runner`, `babel-plugin-transform-runtime`
+  * [#8435](https://github.com/babel/babel/pull/8435) Allow transform-runtime to insert runtime references with absolute paths.. ([@loganfsmyth](https://github.com/loganfsmyth))
+
+#### :bug: Bug Fix
+* `babel-parser`
+  * [#8488](https://github.com/babel/babel/pull/8488) Fix trailingComments for FunctionExpression that is CallExpression arguments. ([@jiaxuan](https://github.com/jiaxuan))
+* `babel-core`
+  * [#8493](https://github.com/babel/babel/pull/8493) Take top-level config source into consideration when processing nested env/overrides.. ([@loganfsmyth](https://github.com/loganfsmyth))
+* `babel-helpers`, `babel-plugin-proposal-decorators`
+  * [#7429](https://github.com/babel/babel/pull/7429) Fix default descriptor setting for class properties with decorators. ([@yhpark](https://github.com/yhpark))
+* `babel-plugin-transform-parameters`
+  * [#8479](https://github.com/babel/babel/pull/8479) Fixes setter paratemer default value. ([@nikolayemrikh](https://github.com/nikolayemrikh))
+
+#### :nail_care: Polish
+* `babel-core`
+  * [#8494](https://github.com/babel/babel/pull/8494) Cache individual programmatic descriptors along with the overall list.. ([@loganfsmyth](https://github.com/loganfsmyth))
+  * [#8493](https://github.com/babel/babel/pull/8493) Take top-level config source into consideration when processing nested env/overrides.. ([@loganfsmyth](https://github.com/loganfsmyth))
+
+#### :house: Internal
+* `babel-core`
+  * [#8493](https://github.com/babel/babel/pull/8493) Take top-level config source into consideration when processing nested env/overrides.. ([@loganfsmyth](https://github.com/loganfsmyth))
+* `babel-plugin-transform-classes`
+  * [#8472](https://github.com/babel/babel/pull/8472) Remove unused file. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+## v7.0.0-rc.1 (2018-08-09)
+
+Same as rc.0 but fixes the peerDep issue #8443. It's changed to just be ^7.0.0-0
+
+## v7.0.0-rc.0 (2018-08-09)
+
+> This had an issue with `peerDependencies` so please use `rc.1`.
+
+Alright finally at the end 🙂. Shouldn't have anymore breaking changes and going to wait some time to fix bugs/regressions
+
+> Summary: `@babel/polyfill` will not include proposal polyfills by default and fixed a regression.
+
+#### :boom: Breaking Change
+* `babel-polyfill`
+  * [#8440](https://github.com/babel/babel/pull/8440) remove proposals polyfills from default import [skip ci]. ([@hzoo](https://github.com/hzoo))
+
+> Will add this to the upgrade guide/polyfill docs. I guess we could include a `babel-upgrade` for this too, not sure.
+
+#### :bug: Bug Fix
+* `babel-cli`
+  * [#8436](https://github.com/babel/babel/pull/8436) Require v1.1.0 so that correct filter params are passed.. ([@loganfsmyth](https://github.com/loganfsmyth))
+
+## v7.0.0-beta.56 (2018-08-03)
+
+- Separate `@babel/runtime`: should work for helpers alone and opt-into core-js if necessary.
+- More details in http://babeljs.io/docs/en/next/babel-runtime, http://babeljs.io/docs/en/next/babel-plugin-transform-runtime (via https://github.com/babel/babel/pull/8266, https://github.com/babel/website/pull/1714)
+- `babel-upgrade` issue: https://github.com/babel/babel-upgrade/issues/70
+
+#### :boom: Breaking Change
+* `babel-plugin-transform-regenerator`, `babel-plugin-transform-runtime`, `babel-runtime-corejs2`, `babel-runtime`
+  * [#8266](https://github.com/babel/babel/pull/8266) Split @babel/runtime into 2 modules via @babel/runtime-corejs2. ([@loganfsmyth](https://github.com/loganfsmyth))
+* `babel-core`, `babel-helper-module-imports`, `babel-helpers`, `babel-plugin-external-helpers`, `babel-plugin-transform-runtime`
+  * [#8398](https://github.com/babel/babel/pull/8398) Only reference helpers from external/runtime helpers if they are known to be available.. ([@loganfsmyth](https://github.com/loganfsmyth))
+
+#### :rocket: New Feature
+* `babel-plugin-transform-regenerator`, `babel-plugin-transform-runtime`, `babel-runtime-corejs2`, `babel-runtime`
+  * [#8266](https://github.com/babel/babel/pull/8266) Split @babel/runtime into 2 modules via @babel/runtime-corejs2. ([@loganfsmyth](https://github.com/loganfsmyth))
+
+#### :bug: Bug Fix
+* `babel-parser`, `babel-plugin-transform-typescript`
+  * [#8408](https://github.com/babel/babel/pull/8408) Allow TSInterfaceDeclaration to be default export. ([@existentialism](https://github.com/existentialism))
+* `babel-preset-env`
+  * [#8403](https://github.com/babel/babel/pull/8403) Ensure esmodule targets are parsed by browserslist. ([@existentialism](https://github.com/existentialism))
+* Other
+  * [#8024](https://github.com/babel/babel/pull/8024) Run transform-runtime on the standalone bundle so it stays ES5-compatible.. ([@loganfsmyth](https://github.com/loganfsmyth))
+
+#### :memo: Documentation
+* [#8412](https://github.com/babel/babel/pull/8412) Update Documentation[skip ci]. ([@leongjiameng](https://github.com/leongjiameng))
+
+## v7.0.0-beta.55 (2018-07-28)
+
+Breaking Change in beta:
+
+> Throws an error on using Stage presets: https://babeljs.io/blog/2018/07/27/removing-babels-stage-presets
+
+#### :boom: Breaking Change
+* `babel-core`, `babel-plugin-proposal-class-properties`, `babel-plugin-proposal-decorators`, `babel-preset-stage-0`, `babel-preset-stage-1`, `babel-preset-stage-2`, `babel-preset-stage-3`, `babel-standalone`
+  * [#8293](https://github.com/babel/babel/pull/8293) Remove Stage presets. ([@hzoo](https://github.com/hzoo))
+
+#### :rocket: New Feature
+* `babel-generator`, `babel-parser`, `babel-plugin-transform-typescript`, `babel-types`
+  * [#7754](https://github.com/babel/babel/pull/7754) TypeScript: Support type arguments on tagged templates. ([@andy-ms](https://github.com/andy-ms))
+
+#### :bug: Bug Fix
+* `babel-cli`, `babel-core`, `babel-generator`
+  * [#8380](https://github.com/babel/babel/pull/8380) Ensure that Identifier source mappings explicitly start and stop on the generated range. ([@loganfsmyth](https://github.com/loganfsmyth))
+* `babel-preset-env`
+  * [#8391](https://github.com/babel/babel/pull/8391) Ensure preset-env doesn't clobber browserslist defaults. ([@existentialism](https://github.com/existentialism))
+* `babel-core`
+  * [#8376](https://github.com/babel/babel/pull/8376) Fix order of optional argument reordering. ([@Qix-](https://github.com/Qix-))
+  * [#8381](https://github.com/babel/babel/pull/8381) Allow an Array for `babelrcRoots`.. ([@wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg))
+  * [#8342](https://github.com/babel/babel/pull/8342) Do not mutate ast. ([@thiagoarrais](https://github.com/thiagoarrais))
+* `babel-parser`
+  * [#8374](https://github.com/babel/babel/pull/8374) Correctly parse interface methods named 'static'. ([@bakkot](https://github.com/bakkot))
+
+#### :nail_care: Polish
+* `babel-parser`
+  * [#8355](https://github.com/babel/babel/pull/8355) remove .then from `dynamic import` parser exception message. ([@dnalborczyk](https://github.com/dnalborczyk))
+
+#### :house: Internal
+* `babel-core`, `babel-preset-stage-0`, `babel-preset-stage-1`, `babel-preset-stage-2`, `babel-preset-stage-3`, `babel-standalone`
+  * [#8397](https://github.com/babel/babel/pull/8397) Remove our own use of stage presets. ([@hzoo](https://github.com/hzoo))
+* `babel-helpers`, `babel-plugin-proposal-class-properties`
+  * [#8318](https://github.com/babel/babel/pull/8318) Save full descriptor instead of only value for private fields.. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-core`
+  * [#8381](https://github.com/babel/babel/pull/8381) Allow an Array for `babelrcRoots`.. ([@wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg))
+* `babel-cli`, `babel-core`, `babel-generator`, `babel-helper-define-map`, `babel-helper-fixtures`, `babel-helper-module-imports`, `babel-helper-module-transforms`, `babel-helper-regex`, `babel-helper-simple-access`, `babel-helper-transform-fixture-test-runner`, `babel-node`, `babel-plugin-transform-block-scoping`, `babel-register`, `babel-template`, `babel-traverse`, `babel-types`
+  * [#8377](https://github.com/babel/babel/pull/8377) Bumped lodash to 4.17.10. ([@Berkmann18](https://github.com/Berkmann18))
+
 ## v7.0.0-beta.54 (2018-07-16)
 
 > Regarding https://github.com/babel/babel/issues/8184, we aren't using `micromatch` for paths, just basic `*/**` substitution now. For anything more complicated we will recommend using a regex/`.js` config.
@@ -2261,7 +2700,7 @@ Also started Babel to compile itself with Babel 7! (We'll be working on making i
 
 #### :nail_care: Polish
 * `babel-register`
-  * [#5411](https://github.com/babel/babel/pull/5411) Seperate version env cache files. ([@pwmckenna](https://github.com/pwmckenna))
+  * [#5411](https://github.com/babel/babel/pull/5411) Separate version env cache files. ([@pwmckenna](https://github.com/pwmckenna))
 
 #### :memo: Documentation
 * `babel-plugin-transform-runtime`

CONTRIBUTING.md

@@ -310,7 +310,7 @@ Note that the code shown in Chrome DevTools is compiled code and therefore diffe
 - Create a new issue that describes the proposal (ex: [#538](https://github.com/babel/babylon/issues/538)). Include any relevant information like proposal repo/author, examples, parsing approaches, meeting notes, presentation slides, and more.
 - The pull request should include:
   - [ ] An update to the [plugins](https://github.com/babel/babel/tree/master/packages/babel-parser#plugins) part of the readme. Add a new entry to that list for the new plugin flag (and link to the proposal)
-  - [ ] If any new nodes or modifications need to be added to the AST, update [ast/spec.md](https://github.com/babel/babel/bloc/master/packages/babel-parser/ast/spec.md)
+  - [ ] If any new nodes or modifications need to be added to the AST, update [ast/spec.md](https://github.com/babel/babel/blob/master/packages/babel-parser/ast/spec.md)
   - [ ] Make sure you use the `this.hasPlugin("plugin-name-here")` check in the babel parser so that your new plugin code only runs when that flag is turned on (not default behavior)
   - [ ] Add failing/passing tests according to spec behavior
 - Start working about the Babel transform itself!

Makefile

@@ -1,6 +1,6 @@
 MAKEFLAGS = -j1
-FLOW_COMMIT = bea8b83f50f597454941d2a7ecef6e93a881e576
-TEST262_COMMIT = f90a52b39609a620c0854e0bd0b3a906c930fd17
+FLOW_COMMIT = e192e1a4793dd8e43415fbfe8046d832cb513c8b
+TEST262_COMMIT = 238c88d4a084d9928372954e2fec54af2c951281
 
 # Fix color output until TravisCI fixes https://github.com/travis-ci/travis-ci/issues/7967
 export FORCE_COLOR = true
@@ -28,6 +28,12 @@ build-standalone:
 build-preset-env-standalone:
 	./node_modules/.bin/gulp build-babel-preset-env-standalone
 
+prepublish-build-standalone:
+	BABEL_ENV=production IS_PUBLISH=true ./node_modules/.bin/gulp build-babel-standalone
+
+prepublish-build-preset-env-standalone:
+	BABEL_ENV=production IS_PUBLISH=true ./node_modules/.bin/gulp build-babel-preset-env-standalone
+
 build-dist: build
 	cd packages/babel-polyfill; \
 	scripts/build-dist.sh
@@ -82,7 +88,7 @@ test-ci-coverage:
 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
+	git clone --branch=master --single-branch --shallow-since=2018-11-01 https://github.com/facebook/flow.git ./build/flow
 	cd build/flow && git checkout $(FLOW_COMMIT)
 
 test-flow:
@@ -96,7 +102,7 @@ test-flow-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
+	git clone --branch=master --single-branch --shallow-since=2018-11-01 https://github.com/tc39/test262.git ./build/test262
 	cd build/test262 && git checkout $(TEST262_COMMIT)
 
 test-test262:
@@ -124,8 +130,7 @@ prepublish:
 	make test
 
 publish: prepublish
-	# --only-explicit-updates
-	./node_modules/.bin/lerna publish
+	./node_modules/.bin/lerna publish --force-publish="@babel/runtime,@babel/runtime-corejs2,@babel/standalone,@babel/preset-env-standalone"
 	make clean
 
 bootstrap: clean-all

README.md

@@ -48,35 +48,15 @@ Become a sponsor and get your logo on our README on Github with a link to your s
   <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)]
 
-## Silver
-
-<a href="https://issue.sh/?utm_medium=github&utm_campaign=babel" target="_blank"><img src="https://user-images.githubusercontent.com/5557143/43912065-c8cdff78-9c33-11e8-829a-0b4166ccc215.png"></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
 
@@ -107,7 +87,7 @@ Mostly a handful of volunteers! Please check out our [team page](https://babeljs
 
 ### 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 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).
 
 ### Is there a Babel song?
 

eslint-local-rules.js

@@ -2,8 +2,10 @@
 
 const noDeprecatedClone = require("./scripts/eslint_rules/no-deprecated-clone");
 const noUndefinedIdentifier = require("./scripts/eslint_rules/no-undefined-identifier");
+const pluginName = require("./scripts/eslint_rules/plugin-name");
 
 module.exports = {
   "no-deprecated-clone": noDeprecatedClone,
   "no-undefined-identifier": noUndefinedIdentifier,
+  "plugin-name": pluginName,
 };

lerna.json

@@ -1,6 +1,5 @@
 {
-  "lerna": "2.11.0",
-  "version": "7.1.0",
+  "version": "7.2.3",
   "changelog": {
     "repo": "babel/babel",
     "cacheDir": ".changelog",
@@ -14,21 +13,21 @@
       "PR: Internal :house:": ":house: Internal"
     }
   },
-  "commands": {
+  "command": {
     "publish": {
-      "ignore": [
+      "ignoreChanges": [
         "*.md",
-        "*.json",
         "*.txt",
         "test/**",
         "codemods/**",
-        "package.json"
+        "# We ignore every JSON file, except for built-in-modules, built-ins and plugins defined in babel-preset-env/data.",
+        "@(!(built-in-modules|built-ins|plugins)).json"
       ]
     }
   },
   "packages": [
-    "packages/*",
-    "codemods/*"
+    "codemods/*",
+    "packages/*"
   ],
   "npmClient": "yarn",
   "npmClientArgs": [

lib/third-party-libs.js.flow

@@ -2,12 +2,6 @@
  * Basic declarations for the npm modules we use.
  */
 
-declare module "micromatch" {
-  declare module.exports: {
-    (Array<string>, Array<string>, ?{ nocase: boolean }): Array<string>,
-  };
-}
-
 declare module "resolve" {
   declare export default {
     sync: (string, {| basedir: string |}) => string;

package.json

@@ -6,73 +6,74 @@
     "build": "make build",
     "fix": "make fix",
     "lint": "make lint",
-    "precommit": "lint-staged",
     "test": "make test"
   },
   "devDependencies": {
-    "@babel/cli": "^7.0.0",
-    "@babel/core": "^7.0.0",
-    "@babel/plugin-proposal-class-properties": "^7.0.0",
-    "@babel/plugin-proposal-export-namespace-from": "^7.0.0",
-    "@babel/plugin-proposal-numeric-separator": "^7.0.0",
-    "@babel/plugin-transform-modules-commonjs": "^7.0.0",
-    "@babel/plugin-transform-runtime": "^7.0.0",
-    "@babel/preset-env": "^7.0.0",
+    "@babel/cli": "^7.2.0",
+    "@babel/core": "^7.2.0",
+    "@babel/eslint-plugin-development": "^1.0.1",
+    "@babel/plugin-proposal-class-properties": "^7.2.1",
+    "@babel/plugin-proposal-export-namespace-from": "^7.2.0",
+    "@babel/plugin-proposal-numeric-separator": "^7.2.0",
+    "@babel/plugin-transform-modules-commonjs": "^7.2.0",
+    "@babel/plugin-transform-runtime": "^7.2.0",
+    "@babel/preset-env": "^7.2.0",
     "@babel/preset-flow": "^7.0.0",
     "@babel/register": "^7.0.0",
-    "@babel/runtime": "^7.0.0",
+    "@babel/runtime": "^7.2.0",
     "babel-core": "^7.0.0-0",
-    "babel-eslint": "^9.0.0",
-    "babel-jest": "^23.4.0",
-    "babel-loader": "8.0.0-beta.4",
-    "babel-plugin-transform-charcodes": "^0.1.0",
+    "babel-eslint": "^10.0.1",
+    "babel-jest": "^23.6.0",
+    "babel-loader": "^8.0.4",
+    "babel-plugin-transform-charcodes": "^0.1.1",
     "browserify": "^16.2.2",
     "bundle-collapser": "^1.2.1",
     "chalk": "^2.3.2",
-    "charcodes": "^0.1.0",
+    "charcodes": "^0.1.1",
     "derequire": "^2.0.2",
     "enhanced-resolve": "^3.0.0",
-    "eslint": "^5.3.0",
-    "eslint-config-babel": "^8.0.0",
-    "eslint-plugin-flowtype": "^2.50.0",
-    "eslint-plugin-local-rules": "0.1.0",
-    "eslint-plugin-prettier": "^2.6.2",
-    "flow-bin": "^0.80.0",
+    "eslint": "^5.9.0",
+    "eslint-config-babel": "^8.0.2",
+    "eslint-plugin-flowtype": "^3.2.0",
+    "eslint-plugin-prettier": "^3.0.0",
+    "flow-bin": "^0.87.0",
     "graceful-fs": "^4.1.11",
     "gulp": "^4.0.0",
-    "gulp-babel": "^8.0.0-beta.2",
+    "gulp-babel": "^8.0.0",
     "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-plumber": "^1.2.0",
+    "gulp-rename": "^1.4.0",
+    "gulp-uglify": "^3.0.1",
     "gulp-util": "^3.0.7",
-    "gulp-watch": "^5.0.0",
-    "husky": "^0.14.3",
-    "jest": "^23.4.1",
-    "lerna": "^2.11.0",
+    "gulp-watch": "^5.0.1",
+    "husky": "^1.2.0",
+    "jest": "^23.6.0",
+    "lerna": "^3.6.0",
     "lerna-changelog": "^0.5.0",
-    "lint-staged": "^6.0.1",
+    "lint-staged": "^8.1.0",
     "lodash": "^4.17.10",
     "merge-stream": "^1.0.1",
     "output-file-sync": "^2.0.0",
-    "prettier": "^1.13.7",
-    "pump": "^1.0.2",
+    "prettier": "^1.15.2",
+    "pump": "^3.0.0",
     "rimraf": "^2.4.3",
     "rollup-plugin-babel": "^4.0.0-beta.0",
     "rollup-plugin-node-resolve": "^3.0.2",
     "rollup-stream": "^1.24.1",
     "test262-stream": "^1.2.0",
     "through2": "^2.0.0",
-    "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"
   },
+  "resolutions": {
+    "@lerna/**/@lerna/collect-updates": "https://github.com/nicolo-ribaudo/lerna.git#babel-collect-updates"
+  },
   "engines": {
-    "node": ">= 6.9.0 <= 11.0.0-0",
+    "node": ">= 6.9.0 < 12.0.0",
     "npm": ">= 3.x <= 6.x",
     "yarn": ">=0.27.5 || >=1.0.0-20170811"
   },
@@ -81,6 +82,11 @@
       "eslint --format=codeframe"
     ]
   },
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged"
+    }
+  },
   "jest": {
     "collectCoverageFrom": [
       "packages/*/src/**/*.mjs",
@@ -121,6 +127,9 @@
       "/test/tmp/",
       "/test/__data__/",
       "<rootDir>/build/"
-    ]
+    ],
+    "moduleNameMapper": {
+      "^@babel/([a-zA-Z0-9_-]+)$": "<rootDir>/packages/babel-$1/"
+    }
   }
 }

packages/babel-cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/cli",
-  "version": "7.1.0",
+  "version": "7.2.3",
   "description": "Babel command line.",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://babeljs.io/",
@@ -36,8 +36,8 @@
     "@babel/core": "^7.0.0-0"
   },
   "devDependencies": {
-    "@babel/core": "^7.0.0",
-    "@babel/helper-fixtures": "^7.0.0"
+    "@babel/core": "^7.2.0",
+    "@babel/helper-fixtures": "^7.2.0"
   },
   "bin": {
     "babel": "./bin/babel.js",

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

@@ -137,7 +137,11 @@ export default async function({ cliOptions, babelOptions }) {
         const dirname = filename;
 
         util
-          .readdirForCompilable(filename, cliOptions.includeDotfiles)
+          .readdirForCompilable(
+            filename,
+            cliOptions.includeDotfiles,
+            cliOptions.extensions,
+          )
           .forEach(function(filename) {
             _filenames.push(path.join(dirname, filename));
           });

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

@@ -22,7 +22,7 @@ commander.option(
   "comma-separated list of plugin names",
   collect,
 );
-commander.option("--config-file [path]", "Path a to .babelrc file to use");
+commander.option("--config-file [path]", "Path to a .babelrc file to use");
 commander.option(
   "--env-name [name]",
   "The name of the 'env' to use when loading configs and plugins. " +
@@ -81,7 +81,7 @@ commander.option(
   "print a comment after any injected non-user code",
 );
 
-// General soucemap formatting.
+// General source map formatting.
 commander.option("-s, --source-maps [true|false|inline|both]", "", booleanify);
 commander.option(
   "--source-map-target [string]",
@@ -221,36 +221,47 @@ export default function parseArgv(args: Array<string>) {
 
   const opts = commander.opts();
 
-  return {
-    babelOptions: {
-      presets: opts.presets,
-      plugins: opts.plugins,
-      rootMode: opts.rootMode,
-      configFile: opts.configFile,
-      envName: opts.envName,
-      sourceType: opts.sourceType,
-      ignore: opts.ignore,
-      only: opts.only,
-      retainLines: opts.retainLines,
-      compact: opts.compact,
-      minified: opts.minified,
-      auxiliaryCommentBefore: opts.auxiliaryCommentBefore,
-      auxiliaryCommentAfter: opts.auxiliaryCommentAfter,
-      sourceMaps: opts.sourceMaps,
-      sourceFileName: opts.sourceFileName,
-      sourceRoot: opts.sourceRoot,
-      moduleRoot: opts.moduleRoot,
-      moduleIds: opts.moduleIds,
-      moduleId: opts.moduleId,
+  const babelOptions = {
+    presets: opts.presets,
+    plugins: opts.plugins,
+    rootMode: opts.rootMode,
+    configFile: opts.configFile,
+    envName: opts.envName,
+    sourceType: opts.sourceType,
+    ignore: opts.ignore,
+    only: opts.only,
+    retainLines: opts.retainLines,
+    compact: opts.compact,
+    minified: opts.minified,
+    auxiliaryCommentBefore: opts.auxiliaryCommentBefore,
+    auxiliaryCommentAfter: opts.auxiliaryCommentAfter,
+    sourceMaps: opts.sourceMaps,
+    sourceFileName: opts.sourceFileName,
+    sourceRoot: opts.sourceRoot,
+    moduleRoot: opts.moduleRoot,
+    moduleIds: opts.moduleIds,
+    moduleId: opts.moduleId,
 
-      // 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.
-      babelrc: opts.babelrc === true ? undefined : opts.babelrc,
-      highlightCode:
-        opts.highlightCode === true ? undefined : opts.highlightCode,
-      comments: opts.comments === true ? undefined : opts.comments,
-    },
+    // 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.
+    babelrc: opts.babelrc === true ? undefined : opts.babelrc,
+    highlightCode: opts.highlightCode === true ? undefined : opts.highlightCode,
+    comments: opts.comments === true ? undefined : opts.comments,
+  };
+
+  // If the @babel/cli version is newer than the @babel/core version, and we have added
+  // new options for @babel/core, we'll potentially get option validation errors from
+  // @babel/core. To avoid that, we delete undefined options, so @babel/core will only
+  // give the error if users actually pass an unsupported CLI option.
+  for (const key of Object.keys(babelOptions)) {
+    if (babelOptions[key] === undefined) {
+      delete babelOptions[key];
+    }
+  }
+
+  return {
+    babelOptions,
     cliOptions: {
       filename: opts.filename,
       filenames,

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

@@ -29,8 +29,11 @@ export function readdir(
 export function readdirForCompilable(
   dirname: string,
   includeDotfiles: boolean,
+  altExts?: Array<string>,
 ) {
-  return readdir(dirname, includeDotfiles, isCompilableExtension);
+  return readdir(dirname, includeDotfiles, function(filename) {
+    return isCompilableExtension(filename, altExts);
+  });
 }
 
 /**

packages/babel-cli/test/fixtures/babel/dir --out-file --extensions/in-files/src/bar/bar.es

@@ -0,0 +1 @@
+ (() => 42)

packages/babel-cli/test/fixtures/babel/dir --out-file --extensions/in-files/src/foo.es

@@ -0,0 +1 @@
+arr.map(x => x * MULTIPLIER);

packages/babel-cli/test/fixtures/babel/dir --out-file --extensions/options.json

@@ -0,0 +1,3 @@
+{
+  "args": ["src", "--out-file", "test.js", "--extensions", ".es"]
+}

packages/babel-cli/test/fixtures/babel/dir --out-file --extensions/out-files/test.js

@@ -0,0 +1,10 @@
+"use strict";
+
+(function () {
+  return 42;
+});
+"use strict";
+
+arr.map(function (x) {
+  return x * MULTIPLIER;
+});

packages/babel-core/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/core",
-  "version": "7.1.0",
+  "version": "7.2.2",
   "description": "Babel compiler core.",
   "main": "lib/index.js",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
@@ -34,15 +34,15 @@
   },
   "dependencies": {
     "@babel/code-frame": "^7.0.0",
-    "@babel/generator": "^7.0.0",
-    "@babel/helpers": "^7.1.0",
-    "@babel/parser": "^7.1.0",
-    "@babel/template": "^7.1.0",
-    "@babel/traverse": "^7.1.0",
-    "@babel/types": "^7.0.0",
+    "@babel/generator": "^7.2.2",
+    "@babel/helpers": "^7.2.0",
+    "@babel/parser": "^7.2.2",
+    "@babel/template": "^7.2.2",
+    "@babel/traverse": "^7.2.2",
+    "@babel/types": "^7.2.2",
     "convert-source-map": "^1.1.0",
-    "debug": "^3.1.0",
-    "json5": "^0.5.0",
+    "debug": "^4.1.0",
+    "json5": "^2.1.0",
     "lodash": "^4.17.10",
     "resolve": "^1.3.2",
     "semver": "^5.4.1",

packages/babel-core/src/config/caching.js

@@ -43,6 +43,7 @@ export function makeWeakCache<
 >(
   handler: (ArgT, CacheConfigurator<SideChannel>) => ResultT,
 ): (ArgT, SideChannel) => ResultT {
+  // $FlowIssue https://github.com/facebook/flow/issues/4528
   return makeCachedFunction(new WeakMap(), handler);
 }
 
@@ -54,6 +55,7 @@ function makeCachedFunction<
   ArgT,
   ResultT,
   SideChannel,
+  // $FlowIssue https://github.com/facebook/flow/issues/4528
   Cache: CacheMap<ArgT, ResultT, SideChannel>,
 >(
   callCache: Cache,

packages/babel-core/src/config/config-chain.js

@@ -67,7 +67,7 @@ export function buildPresetChain(
   return {
     plugins: dedupDescriptors(chain.plugins),
     presets: dedupDescriptors(chain.presets),
-    options: chain.options,
+    options: chain.options.map(o => normalizeOptions(o)),
   };
 }
 
@@ -155,6 +155,7 @@ export function buildRootChain(
   }
 
   let { babelrc, babelrcRoots } = opts;
+  let babelrcRootsDirectory = context.cwd;
 
   const configFileChain = emptyChain();
   if (configFile) {
@@ -168,6 +169,7 @@ export function buildRootChain(
       babelrc = validatedFile.options.babelrc;
     }
     if (babelrcRoots === undefined) {
+      babelrcRootsDirectory = validatedFile.dirname;
       babelrcRoots = validatedFile.options.babelrcRoots;
     }
 
@@ -185,7 +187,7 @@ export function buildRootChain(
   if (
     (babelrc === true || babelrc === undefined) &&
     pkgData &&
-    babelrcLoadEnabled(context, pkgData, babelrcRoots)
+    babelrcLoadEnabled(context, pkgData, babelrcRoots, babelrcRootsDirectory)
   ) {
     ({ ignore: ignoreFile, config: babelrcFile } = findRelativeConfig(
       pkgData,
@@ -229,6 +231,7 @@ function babelrcLoadEnabled(
   context: ConfigContext,
   pkgData: FilePackageData,
   babelrcRoots: BabelrcSearch | void,
+  babelrcRootsDirectory: string,
 ): boolean {
   if (typeof babelrcRoots === "boolean") return babelrcRoots;
 
@@ -243,7 +246,9 @@ function babelrcLoadEnabled(
   let babelrcPatterns = babelrcRoots;
   if (!Array.isArray(babelrcPatterns)) babelrcPatterns = [babelrcPatterns];
   babelrcPatterns = babelrcPatterns.map(pat => {
-    return typeof pat === "string" ? path.resolve(context.cwd, pat) : pat;
+    return typeof pat === "string"
+      ? path.resolve(babelrcRootsDirectory, pat)
+      : pat;
   });
 
   // Fast path to avoid having to match patterns if the babelrc is just
@@ -253,10 +258,12 @@ function babelrcLoadEnabled(
   }
 
   return babelrcPatterns.some(pat => {
-    if (typeof pat === "string") pat = pathPatternToRegex(pat, context.cwd);
+    if (typeof pat === "string") {
+      pat = pathPatternToRegex(pat, babelrcRootsDirectory);
+    }
 
     return pkgData.directories.some(directory => {
-      return matchPattern(pat, context.cwd, directory, context);
+      return matchPattern(pat, babelrcRootsDirectory, directory, context);
     });
   });
 }

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

@@ -132,7 +132,7 @@ function resolveStandardizedName(
     } catch (e2) {}
 
     if (resolvedOppositeType) {
-      e.message += `\n- Did you accidentally pass a ${type} as a ${oppositeType}?`;
+      e.message += `\n- Did you accidentally pass a ${oppositeType} as a ${type}?`;
     }
 
     throw e;

packages/babel-core/src/config/helpers/config-api.js

@@ -55,6 +55,7 @@ export default function makeAPI(
     async: () => false,
     caller,
     assertVersion,
+    tokTypes: undefined,
   };
 }
 

packages/babel-core/src/config/validation/options.js

@@ -350,7 +350,7 @@ function validateNested(loc: NestingPath, opts: {}) {
       NONPRESET_VALIDATORS[key] ||
       BABELRC_VALIDATORS[key] ||
       ROOT_VALIDATORS[key] ||
-      throwUnknownError;
+      (throwUnknownError: Validator<void>);
 
     validator(optLoc, opts[key]);
   });

packages/babel-core/src/index.js

@@ -10,6 +10,8 @@ export { version } from "../package.json";
 export { getEnv } from "./config/helpers/environment";
 
 export * as types from "@babel/types";
+export { tokTypes } from "@babel/parser";
+
 export { default as traverse } from "@babel/traverse";
 export { default as template } from "@babel/template";
 

packages/babel-core/src/transform-file-browser.js

@@ -1,14 +1,29 @@
 // @flow
-import type { FileResult } from "./transformation";
 
-export default function transformFile(
-  filename: string,
-  opts?: Object = {},
-  callback: (?Error, FileResult | null) => void,
+// duplicated from transform-file so we do not have to import anything here
+type TransformFile = {
+  (filename: string, callback: Function): void,
+  (filename: string, opts: ?Object, callback: Function): void,
+};
+
+export const transformFile: TransformFile = (function transformFile(
+  filename,
+  opts,
+  callback,
 ) {
   if (typeof opts === "function") {
     callback = opts;
   }
 
   callback(new Error("Transforming files is not supported in browsers"), null);
+}: Function);
+
+export function transformFileSync() {
+  throw new Error("Transforming files is not supported in browsers");
+}
+
+export function transformFileAsync() {
+  return Promise.reject(
+    new Error("Transforming files is not supported in browsers"),
+  );
 }

packages/babel-core/src/transform-file-sync-browser.js

@@ -1,5 +0,0 @@
-// @flow
-
-export default function transformFileSync() {
-  throw new Error("Transforming files is not supported in browsers");
-}

packages/babel-core/src/transform-file.js

@@ -9,6 +9,14 @@ import {
   type FileResultCallback,
 } from "./transformation";
 
+import typeof * as transformFileBrowserType from "./transform-file-browser";
+import typeof * as transformFileType from "./transform-file";
+
+// Kind of gross, but essentially asserting that the exports of this module are the same as the
+// exports of transform-file-browser, since this file may be replaced at bundle time with
+// transform-file-browser.
+((({}: any): $Exact<transformFileBrowserType>): $Exact<transformFileType>);
+
 type TransformFile = {
   (filename: string, callback: FileResultCallback): void,
   (filename: string, opts: ?InputOptions, callback: FileResultCallback): void,

packages/babel-core/src/transformation/file/merge-map.js

@@ -94,7 +94,7 @@ export default function mergeSourceMap(
 }
 
 function makeMappingKey(item: { line: number, columnStart: number }) {
-  return JSON.stringify([item.line, item.columnStart]);
+  return `${item.line}/${item.columnStart}`;
 }
 
 function eachOverlappingGeneratedOutputRange(

packages/babel-core/src/transformation/util/missing-plugin-helper.js

@@ -1,16 +1,6 @@
 // @flow
 
 const pluginNameMap = {
-  asyncGenerators: {
-    syntax: {
-      name: "@babel/plugin-syntax-async-generators",
-      url: "https://git.io/vb4SY",
-    },
-    transform: {
-      name: "@babel/plugin-proposal-async-generator-functions",
-      url: "https://git.io/vb4yp",
-    },
-  },
   classProperties: {
     syntax: {
       name: "@babel/plugin-syntax-class-properties",
@@ -143,26 +133,6 @@ const pluginNameMap = {
       url: "https://git.io/vb4yS",
     },
   },
-  objectRestSpread: {
-    syntax: {
-      name: "@babel/plugin-syntax-object-rest-spread",
-      url: "https://git.io/vb4y5",
-    },
-    transform: {
-      name: "@babel/plugin-proposal-object-rest-spread",
-      url: "https://git.io/vb4Ss",
-    },
-  },
-  optionalCatchBinding: {
-    syntax: {
-      name: "@babel/plugin-syntax-optional-catch-binding",
-      url: "https://git.io/vb4Sn",
-    },
-    transform: {
-      name: "@babel/plugin-proposal-optional-catch-binding",
-      url: "https://git.io/vb4SI",
-    },
-  },
   optionalChaining: {
     syntax: {
       name: "@babel/plugin-syntax-optional-chaining",
@@ -203,6 +173,41 @@ const pluginNameMap = {
       url: "https://git.io/vb4Sm",
     },
   },
+
+  // TODO: This plugins are now supported by default by @babel/parser: they can
+  // be removed from this list. Although removing them isn't a breaking change,
+  // it's better to keep a nice error message for users using older versions of
+  // the parser. They can be removed in Babel 8.
+  asyncGenerators: {
+    syntax: {
+      name: "@babel/plugin-syntax-async-generators",
+      url: "https://git.io/vb4SY",
+    },
+    transform: {
+      name: "@babel/plugin-proposal-async-generator-functions",
+      url: "https://git.io/vb4yp",
+    },
+  },
+  objectRestSpread: {
+    syntax: {
+      name: "@babel/plugin-syntax-object-rest-spread",
+      url: "https://git.io/vb4y5",
+    },
+    transform: {
+      name: "@babel/plugin-proposal-object-rest-spread",
+      url: "https://git.io/vb4Ss",
+    },
+  },
+  optionalCatchBinding: {
+    syntax: {
+      name: "@babel/plugin-syntax-optional-catch-binding",
+      url: "https://git.io/vb4Sn",
+    },
+    transform: {
+      name: "@babel/plugin-proposal-optional-catch-binding",
+      url: "https://git.io/vb4SI",
+    },
+  },
 };
 
 const getNameURLCombination = ({ name, url }) => `${name} (${url})`;

packages/babel-core/test/api.js

@@ -154,6 +154,14 @@ describe("api", function() {
     );
   });
 
+  it("exposes types", function() {
+    expect(babel.types).toBeDefined();
+  });
+
+  it("exposes the parser's token types", function() {
+    expect(babel.tokTypes).toBeDefined();
+  });
+
   it("transformFile", function(done) {
     const options = {
       babelrc: false,
@@ -769,10 +777,10 @@ describe("api", function() {
         options,
         function(err) {
           expect(err.message).toMatch(
-            "Support for the experimental syntax 'asyncGenerators' isn't currently enabled (1:15):",
+            "Support for the experimental syntax 'logicalAssignment' isn't currently enabled (1:3):",
           );
           expect(err.message).toMatch(
-            "Add @babel/plugin-proposal-async-generator-functions (https://git.io/vb4yp) to the " +
+            "Add @babel/plugin-proposal-logical-assignment-operators (https://git.io/vAlRe) to the " +
               "'plugins' section of your Babel config to enable transformation.",
           );
           done();

packages/babel-core/test/fixtures/api/parsing-errors/syntax-and-transform/file.js

@@ -1,4 +1 @@
-async function* agf() {
-  await 1;
-  yield 2;
-}
+a ||= 2;

packages/babel-core/test/fixtures/transformation/misc/regression-2892/output.js

@@ -43,9 +43,11 @@ function () {
         }, _callee, this);
       }));
 
-      return function bar() {
+      function bar() {
         return _bar.apply(this, arguments);
-      };
+      }
+
+      return bar;
     }()
   }]);
 

packages/babel-core/test/fixtures/transformation/misc/regression-4855/options.json

@@ -1,5 +1,8 @@
 {
   "compact": false,
   "presets": ["env"],
-  "plugins": ["external-helpers", "proposal-object-rest-spread"]
+  "plugins": [
+    ["external-helpers", { "helperVersion": "7.1.5" }],
+    "proposal-object-rest-spread"
+  ]
 }

packages/babel-core/test/resolution.js

@@ -400,7 +400,7 @@ describe("addon resolution", function() {
         presets: ["testplugin"],
       });
     }).toThrow(
-      /Cannot find module 'babel-preset-testplugin'.*\n- Did you accidentally pass a preset as a plugin\?/,
+      /Cannot find module 'babel-preset-testplugin'.*\n- Did you accidentally pass a plugin as a preset\?/,
     );
   });
 
@@ -414,7 +414,7 @@ describe("addon resolution", function() {
         plugins: ["testpreset"],
       });
     }).toThrow(
-      /Cannot find module 'babel-plugin-testpreset'.*\n- Did you accidentally pass a plugin as a preset\?/,
+      /Cannot find module 'babel-plugin-testpreset'.*\n- Did you accidentally pass a preset as a plugin\?/,
     );
   });
 

packages/babel-generator/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/generator",
-  "version": "7.0.0",
+  "version": "7.2.2",
   "description": "Turns an AST into code.",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://babeljs.io/",
@@ -14,14 +14,14 @@
     "lib"
   ],
   "dependencies": {
-    "@babel/types": "^7.0.0",
+    "@babel/types": "^7.2.2",
     "jsesc": "^2.5.1",
     "lodash": "^4.17.10",
     "source-map": "^0.5.0",
     "trim-right": "^1.0.1"
   },
   "devDependencies": {
-    "@babel/helper-fixtures": "^7.0.0",
-    "@babel/parser": "^7.0.0"
+    "@babel/helper-fixtures": "^7.2.0",
+    "@babel/parser": "^7.2.2"
   }
 }

packages/babel-generator/src/generators/classes.js

@@ -140,6 +140,12 @@ export function ClassMethod(node: Object) {
   this.print(node.body, node);
 }
 
+export function ClassPrivateMethod(node: Object) {
+  this._classMethodHead(node);
+  this.space();
+  this.print(node.body, node);
+}
+
 export function _classMethodHead(node) {
   this.printJoin(node.decorators, node);
 

packages/babel-generator/src/generators/expressions.js

@@ -5,7 +5,9 @@ export function UnaryExpression(node: Object) {
   if (
     node.operator === "void" ||
     node.operator === "delete" ||
-    node.operator === "typeof"
+    node.operator === "typeof" ||
+    // throwExpressions
+    node.operator === "throw"
   ) {
     this.word(node.operator);
     this.space();

packages/babel-generator/src/generators/methods.js

@@ -111,7 +111,25 @@ export function ArrowFunctionExpression(node: Object) {
     t.isIdentifier(firstParam) &&
     !hasTypes(node, firstParam)
   ) {
-    this.print(firstParam, node);
+    if (
+      this.format.retainLines &&
+      node.loc &&
+      node.body.loc &&
+      node.loc.start.line < node.body.loc.start.line
+    ) {
+      this.token("(");
+      if (firstParam.loc && firstParam.loc.start.line > node.loc.start.line) {
+        this.indent();
+        this.print(firstParam, node);
+        this.dedent();
+        this._catchUp("start", node.body.loc);
+      } else {
+        this.print(firstParam, node);
+      }
+      this.token(")");
+    } else {
+      this.print(firstParam, node);
+    }
   } else {
     this._params(node);
   }

packages/babel-generator/src/generators/types.js

@@ -151,3 +151,15 @@ export function BigIntLiteral(node: Object) {
   }
   this.token(node.value);
 }
+
+export function PipelineTopicExpression(node: Object) {
+  this.print(node.expression, node);
+}
+
+export function PipelineBareFunction(node: Object) {
+  this.print(node.callee, node);
+}
+
+export function PipelinePrimaryTopicReference() {
+  this.token("#");
+}

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

@@ -127,6 +127,9 @@ export function TSIndexSignature(node) {
 export function TSAnyKeyword() {
   this.word("any");
 }
+export function TSUnknownKeyword() {
+  this.word("unknown");
+}
 export function TSNumberKeyword() {
   this.word("number");
 }
@@ -238,6 +241,16 @@ export function TSTupleType(node) {
   this.token("]");
 }
 
+export function TSOptionalType(node) {
+  this.print(node.typeAnnotation, node);
+  this.token("?");
+}
+
+export function TSRestType(node) {
+  this.token("...");
+  this.print(node.typeAnnotation, node);
+}
+
 export function TSUnionType(node) {
   this.tsPrintUnionOrIntersectionType(node, "|");
 }

packages/babel-generator/src/node/parentheses.js

@@ -166,6 +166,7 @@ export function YieldExpression(node: Object, parent: Object): boolean {
     t.isCallExpression(parent) ||
     t.isMemberExpression(parent) ||
     t.isNewExpression(parent) ||
+    (t.isAwaitExpression(parent) && t.isYieldExpression(node)) ||
     (t.isConditionalExpression(parent) && node === parent.test) ||
     isClassExtendsClause(node, parent)
   );
@@ -209,6 +210,7 @@ export function ConditionalExpression(node: Object, parent: Object): boolean {
     t.isBinary(parent) ||
     t.isConditionalExpression(parent, { test: node }) ||
     t.isAwaitExpression(parent) ||
+    t.isOptionalMemberExpression(parent) ||
     t.isTaggedTemplateExpression(parent) ||
     t.isTSTypeAssertion(parent) ||
     t.isTSAsExpression(parent)
@@ -219,6 +221,13 @@ export function ConditionalExpression(node: Object, parent: Object): boolean {
   return UnaryLike(node, parent);
 }
 
+export function OptionalMemberExpression(
+  node: Object,
+  parent: Object,
+): boolean {
+  return t.isCallExpression(parent) || t.isMemberExpression(parent);
+}
+
 export function AssignmentExpression(node: Object): boolean {
   if (t.isObjectPattern(node.left)) {
     return true;

packages/babel-generator/src/printer.js

@@ -363,14 +363,14 @@ export default class Printer {
     }
     if (needsParens) this.token("(");
 
-    this._printLeadingComments(node, parent);
+    this._printLeadingComments(node);
 
     const loc = t.isProgram(node) || t.isFile(node) ? null : node.loc;
     this.withSource("start", loc, () => {
       this[node.type](node, parent);
     });
 
-    this._printTrailingComments(node, parent);
+    this._printTrailingComments(node);
 
     if (needsParens) this.token(")");
 
@@ -472,12 +472,12 @@ export default class Printer {
     this.print(node, parent);
   }
 
-  _printTrailingComments(node, parent) {
-    this._printComments(this._getComments(false, node, parent));
+  _printTrailingComments(node) {
+    this._printComments(this._getComments(false, node));
   }
 
-  _printLeadingComments(node, parent) {
-    this._printComments(this._getComments(true, node, parent));
+  _printLeadingComments(node) {
+    this._printComments(this._getComments(true, node));
   }
 
   printInnerComments(node, indent = true) {

packages/babel-generator/test/fixtures/compact/expression-statement/options.json

@@ -1 +0,0 @@
-{ "plugins": ["objectRestSpread"] }

packages/babel-generator/test/fixtures/edgecase/async-generator/options.json

@@ -1 +1 @@
-{ "plugins": ["asyncGenerators", "classProperties"] }
+{ "plugins": ["classProperties"] }

packages/babel-generator/test/fixtures/edgecase/single-arg-async-arrow-with-retainlines/input.js

@@ -0,0 +1,11 @@
+var fn = async (
+    arg
+) => {}
+
+async (x)
+=> {}
+
+async x => {}
+
+async (x
+) => {};

packages/babel-generator/test/fixtures/edgecase/single-arg-async-arrow-with-retainlines/options.json

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

packages/babel-generator/test/fixtures/edgecase/single-arg-async-arrow-with-retainlines/output.js

@@ -0,0 +1,11 @@
+var fn = async (
+  arg
+) => {};
+
+async (x) =>
+{};
+
+async x => {};
+
+async (x) =>
+{};

packages/babel-generator/test/fixtures/parentheses/yield-expression/input.js

@@ -10,3 +10,7 @@ function* asdf() {
 function* a(b) {
   (yield xhr({ url: "views/test.html" })).data;
 }
+
+(async function* () {
+  await (yield 1);
+});

packages/babel-generator/test/fixtures/parentheses/yield-expression/output.js

@@ -11,4 +11,8 @@ function* a(b) {
   (yield xhr({
     url: "views/test.html"
   })).data;
-}
+}
+
+(async function* () {
+  await (yield 1);
+});

packages/babel-generator/test/fixtures/regression/throw-expression/input.js

@@ -0,0 +1 @@
+() => throw new X();

packages/babel-generator/test/fixtures/regression/throw-expression/options.json

@@ -0,0 +1 @@
+{ "plugins": ["throwExpressions"] }

packages/babel-generator/test/fixtures/regression/throw-expression/output.js

@@ -0,0 +1 @@
+() => throw new X();

packages/babel-generator/test/fixtures/types/ClassBody-MethodDefinition/input.js

@@ -5,6 +5,15 @@ class Foo {
   get foo() {}
   set foo(bar) {}
 
+  async #foo() {}
+  #foo() {}
+  get #foo() {}
+  set #foo(bar) {}
+  * #foo() {}
+  async * #foo() {}
+  get #bar() {}
+  set #baz(taz) {}
+
   static async foo() {}
   static foo() {}
   static ["foo"]() {}
@@ -52,4 +61,4 @@ class Foo {
   get
   static
   () {}
-}
+}

packages/babel-generator/test/fixtures/types/ClassBody-MethodDefinition/options.json

@@ -0,0 +1 @@
+{ "plugins": ["classPrivateMethods", "asyncGenerators"] }

packages/babel-generator/test/fixtures/types/ClassBody-MethodDefinition/output.js

@@ -9,6 +9,22 @@ class Foo {
 
   set foo(bar) {}
 
+  async #foo() {}
+
+  #foo() {}
+
+  get #foo() {}
+
+  set #foo(bar) {}
+
+  *#foo() {}
+
+  async *#foo() {}
+
+  get #bar() {}
+
+  set #baz(taz) {}
+
   static async foo() {}
 
   static foo() {}

packages/babel-generator/test/fixtures/types/Optional-MemberExpression/input.js

@@ -14,3 +14,7 @@ foo?.["bar"]?.foo;
 0.?.toString();
 0.5?.toString();
 1.000?.toString();
+
+(a?.b).c;
+(a ? b : c)?.d;
+(a?.b)()

packages/babel-generator/test/fixtures/types/Optional-MemberExpression/output.js

@@ -11,4 +11,7 @@ foo?.["bar"].foo;
 foo?.["bar"]?.foo;
 0.?.toString();
 0.5?.toString();
-1.000?.toString();
+1.000?.toString();
+(a?.b).c;
+(a ? b : c)?.d;
+(a?.b)();

packages/babel-generator/test/fixtures/types/Optional-TryStatement-CatchClause/options.json

@@ -1 +0,0 @@
-{ "plugins": ["optionalCatchBinding"] }

packages/babel-generator/test/fixtures/types/PipelineBareFunction/input.js

@@ -0,0 +1 @@
+let result = "hello" |> doubleSay |> text.capitalize |> a.b.exclaim;

packages/babel-generator/test/fixtures/types/PipelineBareFunction/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}

packages/babel-generator/test/fixtures/types/PipelineBareFunction/output.js

@@ -0,0 +1 @@
+let result = "hello" |> doubleSay |> text.capitalize |> a.b.exclaim;

packages/babel-generator/test/fixtures/types/PipelineTopicExpression/input.js

@@ -0,0 +1,8 @@
+value |> # + 1;
+value |> 1 + #;
+value |> do {
+  #;
+};
+value |> do {
+  if (yes) #;
+};

packages/babel-generator/test/fixtures/types/PipelineTopicExpression/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": [["pipelineOperator", { "proposal": "smart" }], "doExpressions"]
+}

packages/babel-generator/test/fixtures/types/PipelineTopicExpression/output.js

@@ -0,0 +1,8 @@
+value |> # + 1;
+value |> 1 + #;
+value |> do {
+  #;
+};
+value |> do {
+  if (yes) #;
+};

packages/babel-generator/test/fixtures/types/RestProperty/options.json

@@ -1 +0,0 @@
-{ "plugins": ["objectRestSpread"] }

packages/babel-generator/test/fixtures/typescript/tuple-empty/input.js

@@ -0,0 +1 @@
+let x: [];

packages/babel-generator/test/fixtures/typescript/tuple-empty/output.js

@@ -0,0 +1 @@
+let x: [];

packages/babel-generator/test/fixtures/typescript/tuple-optional/input.js

@@ -0,0 +1 @@
+let x: [string, number?, (string | number)?]

packages/babel-generator/test/fixtures/typescript/tuple-optional/output.js

@@ -0,0 +1 @@
+let x: [string, number?, (string | number)?];

packages/babel-generator/test/fixtures/typescript/tuple-rest/input.js

@@ -0,0 +1 @@
+let x: [string, ...number[]]

packages/babel-generator/test/fixtures/typescript/tuple-rest/output.js

@@ -0,0 +1 @@
+let x: [string, ...number[]];

packages/babel-generator/test/fixtures/typescript/tuple/input.js

@@ -0,0 +1 @@
+let x: [number, number, number];

packages/babel-generator/test/fixtures/typescript/tuple/output.js

@@ -0,0 +1 @@
+let x: [number, number, number];

packages/babel-generator/test/fixtures/typescript/types-keywords/input.js

@@ -1,4 +1,5 @@
 let a: any;
+let un: unknown;
 let b: boolean;
 let ne: never;
 let nul: null;

packages/babel-generator/test/fixtures/typescript/types-keywords/output.js

@@ -1,4 +1,5 @@
 let a: any;
+let un: unknown;
 let b: boolean;
 let ne: never;
 let nul: null;
@@ -7,4 +8,4 @@ let o: object;
 let st: string;
 let sy: symbol;
 let u: undefined;
-let v: void;
+let v: void;

packages/babel-helper-create-class-features-plugin/.npmignore

@@ -0,0 +1,3 @@
+src
+test
+*.log

packages/babel-helper-create-class-features-plugin/README.md

@@ -0,0 +1,19 @@
+# @babel/plugin-class-features
+
+> Compile class public and private fields, private methods and decorators to ES6
+
+See our website [@babel/plugin-class-features](https://babeljs.io/docs/en/next/babel-plugin-class-features.html) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/plugin-class-features
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/plugin-class-features --dev
+```

packages/babel-helper-create-class-features-plugin/package.json

@@ -0,0 +1,30 @@
+{
+  "name": "@babel/helper-create-class-features-plugin",
+  "version": "7.2.3",
+  "author": "The Babel Team (https://babeljs.io/team)",
+  "license": "MIT",
+  "description": "Compile class public and private fields, private methods and decorators to ES6",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-helper-create-class-features-plugin",
+  "main": "lib/index.js",
+  "publishConfig": {
+    "access": "public"
+  },
+  "keywords": [
+    "babel",
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "@babel/helper-function-name": "^7.1.0",
+    "@babel/helper-member-expression-to-functions": "^7.0.0",
+    "@babel/helper-optimise-call-expression": "^7.0.0",
+    "@babel/helper-plugin-utils": "^7.0.0",
+    "@babel/helper-replace-supers": "^7.2.3"
+  },
+  "peerDependencies": {
+    "@babel/core": "^7.0.0"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.2.2",
+    "@babel/helper-plugin-test-runner": "^7.0.0"
+  }
+}

packages/babel-helper-create-class-features-plugin/src/decorators.js

@@ -0,0 +1,154 @@
+import { types as t, template } from "@babel/core";
+import ReplaceSupers from "@babel/helper-replace-supers";
+
+export function hasOwnDecorators(node) {
+  return !!(node.decorators && node.decorators.length);
+}
+
+export function hasDecorators(node) {
+  return hasOwnDecorators(node) || node.body.body.some(hasOwnDecorators);
+}
+
+function prop(key, value) {
+  if (!value) return null;
+  return t.objectProperty(t.identifier(key), value);
+}
+
+function value(body, params = [], async, generator) {
+  const method = t.objectMethod("method", t.identifier("value"), params, body);
+  method.async = !!async;
+  method.generator = !!generator;
+  return method;
+}
+
+function takeDecorators(node) {
+  let result;
+  if (node.decorators && node.decorators.length > 0) {
+    result = t.arrayExpression(
+      node.decorators.map(decorator => decorator.expression),
+    );
+  }
+  node.decorators = undefined;
+  return result;
+}
+
+function getKey(node) {
+  if (node.computed) {
+    return node.key;
+  } else if (t.isIdentifier(node.key)) {
+    return t.stringLiteral(node.key.name);
+  } else {
+    return t.stringLiteral(String(node.key.value));
+  }
+}
+
+// NOTE: This function can be easily bound as .bind(file, classRef, superRef)
+//       to make it easier to use it in a loop.
+function extractElementDescriptor(/* this: File, */ classRef, superRef, path) {
+  const { node, scope } = path;
+  const isMethod = path.isClassMethod();
+
+  if (path.isPrivate()) {
+    throw path.buildCodeFrameError(
+      `Private ${
+        isMethod ? "methods" : "fields"
+      } in decorated classes are not supported yet.`,
+    );
+  }
+
+  new ReplaceSupers(
+    {
+      methodPath: path,
+      methodNode: node,
+      objectRef: classRef,
+      isStatic: node.static,
+      superRef,
+      scope,
+      file: this,
+    },
+    true,
+  ).replace();
+
+  const properties = [
+    prop("kind", t.stringLiteral(isMethod ? node.kind : "field")),
+    prop("decorators", takeDecorators(node)),
+    prop("static", node.static && t.booleanLiteral(true)),
+    prop("key", getKey(node)),
+    isMethod
+      ? value(node.body, node.params, node.async, node.generator)
+      : node.value
+      ? value(template.ast`{ return ${node.value} }`)
+      : prop("value", scope.buildUndefinedNode()),
+  ].filter(Boolean);
+
+  path.remove();
+
+  return t.objectExpression(properties);
+}
+
+function addDecorateHelper(file) {
+  try {
+    return file.addHelper("decorate");
+  } catch (err) {
+    if (err.code === "BABEL_HELPER_UNKNOWN") {
+      err.message +=
+        "\n  '@babel/plugin-transform-decorators' in non-legacy mode" +
+        " requires '@babel/core' version ^7.0.2 and you appear to be using" +
+        " an older version.";
+    }
+    throw err;
+  }
+}
+
+export function buildDecoratedClass(ref, path, elements, file) {
+  const { node, scope } = path;
+  const initializeId = scope.generateUidIdentifier("initialize");
+  const isDeclaration = node.id && path.isDeclaration();
+  const isStrict = path.isInStrictMode();
+  const { superClass } = node;
+
+  node.type = "ClassDeclaration";
+  if (!node.id) node.id = t.cloneNode(ref);
+
+  let superId;
+  if (superClass) {
+    superId = scope.generateUidIdentifierBasedOnNode(node.superClass, "super");
+    node.superClass = superId;
+  }
+
+  const classDecorators = takeDecorators(node);
+  const definitions = t.arrayExpression(
+    elements.map(extractElementDescriptor.bind(file, node.id, superId)),
+  );
+
+  let replacement = template.expression.ast`
+    ${addDecorateHelper(file)}(
+      ${classDecorators || t.nullLiteral()},
+      function (${initializeId}, ${superClass ? superId : null}) {
+        ${node}
+        return { F: ${t.cloneNode(node.id)}, d: ${definitions} };
+      },
+      ${superClass}
+    )
+  `;
+  let classPathDesc = "arguments.1.body.body.0";
+
+  if (!isStrict) {
+    replacement.arguments[1].body.directives.push(
+      t.directive(t.directiveLiteral("use strict")),
+    );
+  }
+
+  if (isDeclaration) {
+    replacement = template.ast`let ${ref} = ${replacement}`;
+    classPathDesc = "declarations.0.init." + classPathDesc;
+  }
+
+  return {
+    instanceNodes: [template.statement.ast`${initializeId}(this)`],
+    wrapClass(path) {
+      path.replaceWith(replacement);
+      return path.get(classPathDesc);
+    },
+  };
+}

packages/babel-helper-create-class-features-plugin/src/features.js

@@ -0,0 +1,91 @@
+import { hasOwnDecorators } from "./decorators";
+
+export const FEATURES = Object.freeze({
+  //classes: 1 << 0,
+  fields: 1 << 1,
+  privateMethods: 1 << 2,
+  decorators: 1 << 3,
+});
+
+// We can't use a symbol because this needs to always be the same, even if
+// this package isn't deduped by npm. e.g.
+//  - node_modules/
+//    - @babel/plugin-class-features
+//    - @babel/plugin-proposal-decorators
+//      - node_modules
+//        - @babel-plugin-class-features
+const featuresKey = "@babel/plugin-class-features/featuresKey";
+const looseKey = "@babel/plugin-class-features/looseKey";
+
+export function enableFeature(file, feature, loose) {
+  // We can't blindly enable the feature because, if it was already set,
+  // "loose" can't be changed, so that
+  //   @babel/plugin-class-properties { loose: true }
+  //   @babel/plugin-class-properties { loose: false }
+  // is transformed in loose mode.
+  // We only enabled the feature if it was previously disabled.
+  if (!hasFeature(file, feature)) {
+    file.set(featuresKey, file.get(featuresKey) | feature);
+    if (loose) file.set(looseKey, file.get(looseKey) | feature);
+  }
+}
+
+function hasFeature(file, feature) {
+  return !!(file.get(featuresKey) & feature);
+}
+
+export function isLoose(file, feature) {
+  return !!(file.get(looseKey) & feature);
+}
+
+export function verifyUsedFeatures(path, file) {
+  if (hasOwnDecorators(path)) {
+    if (!hasFeature(file, FEATURES.decorators)) {
+      throw path.buildCodeFrameError("Decorators are not enabled.");
+    }
+
+    if (path.isPrivate()) {
+      throw path.buildCodeFrameError(
+        `Private ${
+          path.isClassMethod() ? "methods" : "fields"
+        } in decorated classes are not supported yet.`,
+      );
+    }
+  }
+
+  // NOTE: We can't use path.isPrivateMethod() because it isn't supported in <7.2.0
+  if (path.isPrivate() && path.isMethod()) {
+    if (!hasFeature(file, FEATURES.privateMethods)) {
+      throw path.buildCodeFrameError("Class private methods are not enabled.");
+    }
+
+    if (path.node.static) {
+      throw path.buildCodeFrameError(
+        "@babel/plugin-class-features doesn't support class static private methods yet.",
+      );
+    }
+
+    if (path.node.kind !== "method") {
+      throw path.buildCodeFrameError(
+        "@babel/plugin-class-features doesn't support class private accessors yet.",
+      );
+    }
+  }
+
+  if (
+    hasFeature(file, FEATURES.privateMethods) &&
+    hasFeature(file, FEATURES.fields) &&
+    isLoose(file, FEATURES.privateMethods) !== isLoose(file, FEATURES.fields)
+  ) {
+    throw path.buildCodeFrameError(
+      "'loose' mode configuration must be the same for both @babel/plugin-proposal-class-properties " +
+        "and @babel/plugin-proposal-private-methods",
+    );
+  }
+
+  if (path.isProperty()) {
+    if (!hasFeature(file, FEATURES.fields)) {
+      throw path.buildCodeFrameError("Class fields are not enabled.");
+    }
+  }
+}

packages/babel-helper-create-class-features-plugin/src/fields.js

@@ -0,0 +1,428 @@
+import { template, traverse, types as t } from "@babel/core";
+import { environmentVisitor } from "@babel/helper-replace-supers";
+import memberExpressionToFunctions from "@babel/helper-member-expression-to-functions";
+import optimiseCall from "@babel/helper-optimise-call-expression";
+
+export function buildPrivateNamesMap(props) {
+  const privateNamesMap = new Map();
+  for (const prop of props) {
+    if (prop.isPrivate()) {
+      const { name } = prop.node.key.id;
+      privateNamesMap.set(name, {
+        id: prop.scope.generateUidIdentifier(name),
+        static: !!prop.node.static,
+        method: prop.isMethod(),
+        methodId: prop.isMethod()
+          ? prop.scope.generateUidIdentifier(name)
+          : undefined,
+      });
+    }
+  }
+  return privateNamesMap;
+}
+
+export function buildPrivateNamesNodes(privateNamesMap, loose, state) {
+  const initNodes = [];
+
+  for (const [name, value] of privateNamesMap) {
+    // In loose mode, both static and instance fields are transpiled using a
+    // secret non-enumerable property. Hence, we also need to generate that
+    // key (using the classPrivateFieldLooseKey helper).
+    // In spec mode, only instance fields need a "private name" initializer
+    // because static fields are directly assigned to a variable in the
+    // buildPrivateStaticFieldInitSpec function.
+    const { id, static: isStatic, method: isMethod } = value;
+    if (loose) {
+      initNodes.push(
+        template.statement.ast`
+          var ${id} = ${state.addHelper("classPrivateFieldLooseKey")}("${name}")
+        `,
+      );
+    } else if (isMethod && !isStatic) {
+      initNodes.push(template.statement.ast`var ${id} = new WeakSet();`);
+    } else if (!isStatic) {
+      initNodes.push(template.statement.ast`var ${id} = new WeakMap();`);
+    }
+  }
+
+  return initNodes;
+}
+
+// Traverses the class scope, handling private name references. If an inner
+// class redeclares the same private name, it will hand off traversal to the
+// restricted visitor (which doesn't traverse the inner class's inner scope).
+const privateNameVisitor = {
+  PrivateName(path) {
+    const { privateNamesMap } = this;
+    const { node, parentPath } = path;
+
+    if (!parentPath.isMemberExpression({ property: node })) return;
+    if (!privateNamesMap.has(node.id.name)) return;
+
+    this.handle(parentPath);
+  },
+
+  Class(path) {
+    const { privateNamesMap } = this;
+    const body = path.get("body.body");
+
+    for (const prop of body) {
+      if (!prop.isPrivate()) {
+        continue;
+      }
+      if (!privateNamesMap.has(prop.node.key.id.name)) continue;
+
+      // This class redeclares the private name.
+      // So, we can only evaluate the things in the outer scope.
+      path.traverse(privateNameInnerVisitor, this);
+      path.skip();
+      break;
+    }
+  },
+};
+
+// Traverses the outer portion of a class, without touching the class's inner
+// scope, for private names.
+const privateNameInnerVisitor = traverse.visitors.merge([
+  {
+    PrivateName: privateNameVisitor.PrivateName,
+  },
+  environmentVisitor,
+]);
+
+const privateNameHandlerSpec = {
+  memoise(member, count) {
+    const { scope } = member;
+    const { object } = member.node;
+
+    const memo = scope.maybeGenerateMemoised(object);
+    if (!memo) {
+      return;
+    }
+
+    this.memoiser.set(object, memo, count);
+  },
+
+  receiver(member) {
+    const { object } = member.node;
+
+    if (this.memoiser.has(object)) {
+      return t.cloneNode(this.memoiser.get(object));
+    }
+
+    return t.cloneNode(object);
+  },
+
+  get(member) {
+    const { classRef, privateNamesMap, file } = this;
+    const { name } = member.node.property.id;
+    const {
+      id,
+      static: isStatic,
+      method: isMethod,
+      methodId,
+    } = privateNamesMap.get(name);
+
+    if (isStatic && !isMethod) {
+      return t.callExpression(
+        file.addHelper("classStaticPrivateFieldSpecGet"),
+        [this.receiver(member), t.cloneNode(classRef), t.cloneNode(id)],
+      );
+    } else if (isMethod) {
+      return t.callExpression(file.addHelper("classPrivateMethodGet"), [
+        this.receiver(member),
+        t.cloneNode(id),
+        t.cloneNode(methodId),
+      ]);
+    } else {
+      return t.callExpression(file.addHelper("classPrivateFieldGet"), [
+        this.receiver(member),
+        t.cloneNode(id),
+      ]);
+    }
+  },
+
+  set(member, value) {
+    const { classRef, privateNamesMap, file } = this;
+    const { name } = member.node.property.id;
+    const { id, static: isStatic, method: isMethod } = privateNamesMap.get(
+      name,
+    );
+
+    if (isStatic && !isMethod) {
+      return t.callExpression(
+        file.addHelper("classStaticPrivateFieldSpecSet"),
+        [this.receiver(member), t.cloneNode(classRef), t.cloneNode(id), value],
+      );
+    } else if (isMethod) {
+      return t.callExpression(file.addHelper("classPrivateMethodSet"), []);
+    } else {
+      return t.callExpression(file.addHelper("classPrivateFieldSet"), [
+        this.receiver(member),
+        t.cloneNode(id),
+        value,
+      ]);
+    }
+  },
+
+  call(member, args) {
+    // The first access (the get) should do the memo assignment.
+    this.memoise(member, 1);
+
+    return optimiseCall(this.get(member), this.receiver(member), args);
+  },
+};
+
+const privateNameHandlerLoose = {
+  handle(member) {
+    const { privateNamesMap, file } = this;
+    const { object } = member.node;
+    const { name } = member.node.property.id;
+
+    member.replaceWith(
+      template.expression`BASE(REF, PROP)[PROP]`({
+        BASE: file.addHelper("classPrivateFieldLooseBase"),
+        REF: object,
+        PROP: privateNamesMap.get(name).id,
+      }),
+    );
+  },
+};
+
+export function transformPrivateNamesUsage(
+  ref,
+  path,
+  privateNamesMap,
+  loose,
+  state,
+) {
+  const body = path.get("body");
+
+  if (loose) {
+    body.traverse(privateNameVisitor, {
+      privateNamesMap,
+      file: state,
+      ...privateNameHandlerLoose,
+    });
+  } else {
+    memberExpressionToFunctions(body, privateNameVisitor, {
+      privateNamesMap,
+      classRef: ref,
+      file: state,
+      ...privateNameHandlerSpec,
+    });
+  }
+}
+
+function buildPrivateFieldInitLoose(ref, prop, privateNamesMap) {
+  const { id } = privateNamesMap.get(prop.node.key.id.name);
+  const value = prop.node.value || prop.scope.buildUndefinedNode();
+
+  return template.statement.ast`
+    Object.defineProperty(${ref}, ${id}, {
+      // configurable is false by default
+      // enumerable is false by default
+      writable: true,
+      value: ${value}
+    });
+  `;
+}
+
+function buildPrivateInstanceFieldInitSpec(ref, prop, privateNamesMap) {
+  const { id } = privateNamesMap.get(prop.node.key.id.name);
+  const value = prop.node.value || prop.scope.buildUndefinedNode();
+
+  return template.statement.ast`${id}.set(${ref}, {
+    // configurable is always false for private elements
+    // enumerable is always false for private elements
+    writable: true,
+    value: ${value},
+  })`;
+}
+
+function buildPrivateStaticFieldInitSpec(prop, privateNamesMap) {
+  const { id } = privateNamesMap.get(prop.node.key.id.name);
+  const value = prop.node.value || prop.scope.buildUndefinedNode();
+
+  return template.statement.ast`
+    var ${id} = {
+      // configurable is false by default
+      // enumerable is false by default
+      writable: true,
+      value: ${value}
+    };
+  `;
+}
+
+function buildPrivateMethodInitLoose(ref, prop, privateNamesMap) {
+  const { methodId, id } = privateNamesMap.get(prop.node.key.id.name);
+
+  return template.statement.ast`
+    Object.defineProperty(${ref}, ${id}, {
+      // configurable is false by default
+      // enumerable is false by default
+      // writable is false by default
+      value: ${methodId.name}
+    });
+  `;
+}
+
+function buildPrivateInstanceMethodInitSpec(ref, prop, privateNamesMap) {
+  const { id } = privateNamesMap.get(prop.node.key.id.name);
+
+  return template.statement.ast`${id}.add(${ref})`;
+}
+
+function buildPublicFieldInitLoose(ref, prop) {
+  const { key, computed } = prop.node;
+  const value = prop.node.value || prop.scope.buildUndefinedNode();
+
+  return t.expressionStatement(
+    t.assignmentExpression(
+      "=",
+      t.memberExpression(ref, key, computed || t.isLiteral(key)),
+      value,
+    ),
+  );
+}
+
+function buildPublicFieldInitSpec(ref, prop, state) {
+  const { key, computed } = prop.node;
+  const value = prop.node.value || prop.scope.buildUndefinedNode();
+
+  return t.expressionStatement(
+    t.callExpression(state.addHelper("defineProperty"), [
+      ref,
+      computed || t.isLiteral(key) ? key : t.stringLiteral(key.name),
+      value,
+    ]),
+  );
+}
+
+function buildPrivateInstanceMethodDeclaration(prop, privateNamesMap) {
+  const { methodId } = privateNamesMap.get(prop.node.key.id.name);
+  const { params, body } = prop.node;
+  const methodValue = t.functionExpression(methodId, params, body);
+
+  return t.variableDeclaration("var", [
+    t.variableDeclarator(methodId, methodValue),
+  ]);
+}
+
+export function buildFieldsInitNodes(
+  ref,
+  props,
+  privateNamesMap,
+  state,
+  loose,
+) {
+  const staticNodes = [];
+  const instanceNodes = [];
+  let needsClassRef = false;
+
+  for (const prop of props) {
+    const isStatic = prop.node.static;
+    const isInstance = !isStatic;
+    const isPrivate = prop.isPrivate();
+    const isPublic = !isPrivate;
+    const isField = prop.isProperty();
+    const isMethod = !isField;
+
+    switch (true) {
+      case isStatic && isPrivate && isField && loose:
+        needsClassRef = true;
+        staticNodes.push(
+          buildPrivateFieldInitLoose(t.cloneNode(ref), prop, privateNamesMap),
+        );
+        break;
+      case isStatic && isPrivate && isField && !loose:
+        needsClassRef = true;
+        staticNodes.push(
+          buildPrivateStaticFieldInitSpec(prop, privateNamesMap),
+        );
+        break;
+      case isStatic && isPublic && isField && loose:
+        needsClassRef = true;
+        staticNodes.push(buildPublicFieldInitLoose(t.cloneNode(ref), prop));
+        break;
+      case isStatic && isPublic && isField && !loose:
+        needsClassRef = true;
+        staticNodes.push(
+          buildPublicFieldInitSpec(t.cloneNode(ref), prop, state),
+        );
+        break;
+      case isInstance && isPrivate && isField && loose:
+        instanceNodes.push(
+          buildPrivateFieldInitLoose(t.thisExpression(), prop, privateNamesMap),
+        );
+        break;
+      case isInstance && isPrivate && isField && !loose:
+        instanceNodes.push(
+          buildPrivateInstanceFieldInitSpec(
+            t.thisExpression(),
+            prop,
+            privateNamesMap,
+          ),
+        );
+        break;
+      case isInstance && isPrivate && isMethod && loose:
+        instanceNodes.push(
+          buildPrivateMethodInitLoose(
+            t.thisExpression(),
+            prop,
+            privateNamesMap,
+          ),
+        );
+        staticNodes.push(
+          buildPrivateInstanceMethodDeclaration(prop, privateNamesMap),
+        );
+        break;
+      case isInstance && isPrivate && isMethod && !loose:
+        instanceNodes.push(
+          buildPrivateInstanceMethodInitSpec(
+            t.thisExpression(),
+            prop,
+            privateNamesMap,
+          ),
+        );
+        staticNodes.push(
+          buildPrivateInstanceMethodDeclaration(prop, privateNamesMap),
+        );
+        break;
+      case isInstance && isPublic && isField && loose:
+        instanceNodes.push(buildPublicFieldInitLoose(t.thisExpression(), prop));
+        break;
+      case isInstance && isPublic && isField && !loose:
+        instanceNodes.push(
+          buildPublicFieldInitSpec(t.thisExpression(), prop, state),
+        );
+        break;
+      default:
+        throw new Error("Unreachable.");
+    }
+  }
+
+  return {
+    staticNodes,
+    instanceNodes,
+    wrapClass(path) {
+      for (const prop of props) {
+        prop.remove();
+      }
+
+      if (!needsClassRef) return path;
+
+      if (path.isClassExpression()) {
+        path.scope.push({ id: ref });
+        path.replaceWith(
+          t.assignmentExpression("=", t.cloneNode(ref), path.node),
+        );
+      } else if (!path.node.id) {
+        // Anonymous class declaration
+        path.node.id = ref;
+      }
+
+      return path;
+    },
+  };
+}

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

@@ -0,0 +1,187 @@
+import nameFunction from "@babel/helper-function-name";
+import splitExportDeclaration from "@babel/helper-split-export-declaration";
+import {
+  buildPrivateNamesNodes,
+  buildPrivateNamesMap,
+  transformPrivateNamesUsage,
+  buildFieldsInitNodes,
+} from "./fields";
+import {
+  hasOwnDecorators,
+  buildDecoratedClass,
+  hasDecorators,
+} from "./decorators";
+import { injectInitialization, extractComputedKeys } from "./misc";
+import {
+  enableFeature,
+  verifyUsedFeatures,
+  FEATURES,
+  isLoose,
+} from "./features";
+
+import pkg from "../package.json";
+
+export { FEATURES };
+
+// Note: Versions are represented as an integer. e.g. 7.1.5 is represented
+//       as 70000100005. This method is easier than using a semver-parsing
+//       package, but it breaks if we relese x.y.z where x, y or z are
+//       greater than 99_999.
+const version = pkg.version.split(".").reduce((v, x) => v * 1e5 + +x, 0);
+const versionKey = "@babel/plugin-class-features/version";
+
+export function createClassFeaturePlugin({
+  name,
+  feature,
+  loose,
+  manipulateOptions,
+}) {
+  return {
+    name,
+    manipulateOptions,
+
+    pre() {
+      enableFeature(this.file, feature, loose);
+
+      if (!this.file.get(versionKey) || this.file.get(versionKey) < version) {
+        this.file.set(versionKey, version);
+      }
+    },
+
+    visitor: {
+      Class(path, state) {
+        if (this.file.get(versionKey) !== version) return;
+
+        verifyUsedFeatures(path, this.file);
+
+        // Only fields are currently supported, this needs to be moved somewhere
+        // else when other features are added.
+        const loose = isLoose(this.file, FEATURES.fields);
+
+        let constructor;
+        let isDecorated = hasOwnDecorators(path.node);
+        const props = [];
+        const elements = [];
+        const computedPaths = [];
+        const privateNames = new Set();
+        const body = path.get("body");
+
+        for (const path of body.get("body")) {
+          verifyUsedFeatures(path, this.file);
+
+          if (path.node.computed) {
+            computedPaths.push(path);
+          }
+
+          if (path.isPrivate()) {
+            const { name } = path.node.key.id;
+
+            if (privateNames.has(name)) {
+              throw path.buildCodeFrameError("Duplicate private field");
+            }
+            privateNames.add(name);
+          }
+
+          if (path.isClassMethod({ kind: "constructor" })) {
+            constructor = path;
+          } else {
+            elements.push(path);
+            if (path.isProperty() || path.isPrivate()) {
+              props.push(path);
+            }
+          }
+
+          if (!isDecorated) isDecorated = hasOwnDecorators(path.node);
+        }
+
+        if (!props.length && !isDecorated) return;
+
+        let ref;
+
+        if (path.isClassExpression() || !path.node.id) {
+          nameFunction(path);
+          ref = path.scope.generateUidIdentifier("class");
+        } else {
+          ref = path.node.id;
+        }
+
+        // NODE: These three functions don't support decorators yet,
+        //       but verifyUsedFeatures throws if there are both
+        //       decorators and private fields.
+        const privateNamesMap = buildPrivateNamesMap(props);
+        const privateNamesNodes = buildPrivateNamesNodes(
+          privateNamesMap,
+          loose,
+          state,
+        );
+
+        transformPrivateNamesUsage(ref, path, privateNamesMap, loose, state);
+
+        let keysNodes, staticNodes, instanceNodes, wrapClass;
+
+        if (isDecorated) {
+          staticNodes = keysNodes = [];
+          ({ instanceNodes, wrapClass } = buildDecoratedClass(
+            ref,
+            path,
+            elements,
+            this.file,
+          ));
+        } else {
+          keysNodes = extractComputedKeys(ref, path, computedPaths, this.file);
+          ({ staticNodes, instanceNodes, wrapClass } = buildFieldsInitNodes(
+            ref,
+            props,
+            privateNamesMap,
+            state,
+            loose,
+          ));
+        }
+
+        if (instanceNodes.length > 0) {
+          injectInitialization(
+            path,
+            constructor,
+            instanceNodes,
+            (referenceVisitor, state) => {
+              if (isDecorated) return;
+              for (const prop of props) {
+                if (prop.node.static) continue;
+                prop.traverse(referenceVisitor, state);
+              }
+            },
+          );
+        }
+
+        path = wrapClass(path);
+        path.insertBefore(keysNodes);
+        path.insertAfter([...privateNamesNodes, ...staticNodes]);
+      },
+
+      PrivateName(path) {
+        if (this.file.get(versionKey) !== version) return;
+
+        throw path.buildCodeFrameError(`Unknown PrivateName "${path}"`);
+      },
+
+      ExportDefaultDeclaration(path) {
+        if (this.file.get(versionKey) !== version) return;
+
+        const decl = path.get("declaration");
+
+        if (decl.isClassDeclaration() && hasDecorators(decl.node)) {
+          if (decl.node.id) {
+            // export default class Foo {}
+            //   -->
+            // class Foo {} export { Foo as default }
+            splitExportDeclaration(path);
+          } else {
+            // Annyms class declarations can be
+            // transformed as if they were expressions
+            decl.node.type = "ClassExpression";
+          }
+        }
+      },
+    },
+  };
+}

packages/babel-helper-create-class-features-plugin/src/misc.js

@@ -0,0 +1,111 @@
+import { template, traverse, types as t } from "@babel/core";
+import { environmentVisitor } from "@babel/helper-replace-supers";
+
+const findBareSupers = traverse.visitors.merge([
+  {
+    Super(path) {
+      const { node, parentPath } = path;
+      if (parentPath.isCallExpression({ callee: node })) {
+        this.push(parentPath);
+      }
+    },
+  },
+  environmentVisitor,
+]);
+
+const referenceVisitor = {
+  "TSTypeAnnotation|TypeAnnotation"(path) {
+    path.skip();
+  },
+
+  ReferencedIdentifier(path) {
+    if (this.scope.hasOwnBinding(path.node.name)) {
+      this.scope.rename(path.node.name);
+      path.skip();
+    }
+  },
+};
+
+const classFieldDefinitionEvaluationTDZVisitor = traverse.visitors.merge([
+  {
+    ReferencedIdentifier(path) {
+      if (
+        this.classBinding &&
+        this.classBinding === path.scope.getBinding(path.node.name)
+      ) {
+        const classNameTDZError = this.file.addHelper("classNameTDZError");
+        const throwNode = t.callExpression(classNameTDZError, [
+          t.stringLiteral(path.node.name),
+        ]);
+
+        path.replaceWith(t.sequenceExpression([throwNode, path.node]));
+        path.skip();
+      }
+    },
+  },
+  environmentVisitor,
+]);
+
+export function injectInitialization(path, constructor, nodes, renamer) {
+  if (!nodes.length) return;
+
+  const isDerived = !!path.node.superClass;
+
+  if (!constructor) {
+    const newConstructor = t.classMethod(
+      "constructor",
+      t.identifier("constructor"),
+      [],
+      t.blockStatement([]),
+    );
+
+    if (isDerived) {
+      newConstructor.params = [t.restElement(t.identifier("args"))];
+      newConstructor.body.body.push(template.statement.ast`super(...args)`);
+    }
+
+    [constructor] = path.get("body").unshiftContainer("body", newConstructor);
+  }
+
+  if (renamer) {
+    renamer(referenceVisitor, { scope: constructor.scope });
+  }
+
+  if (isDerived) {
+    const bareSupers = [];
+    constructor.traverse(findBareSupers, bareSupers);
+    for (const bareSuper of bareSupers) {
+      bareSuper.insertAfter(nodes);
+    }
+  } else {
+    constructor.get("body").unshiftContainer("body", nodes);
+  }
+}
+
+export function extractComputedKeys(ref, path, computedPaths, file) {
+  const declarations = [];
+
+  for (const computedPath of computedPaths) {
+    computedPath.traverse(classFieldDefinitionEvaluationTDZVisitor, {
+      classBinding: path.node.id && path.scope.getBinding(path.node.id.name),
+      file,
+    });
+
+    const computedNode = computedPath.node;
+    // Make sure computed property names are only evaluated once (upon class definition)
+    // and in the right order in combination with static properties
+    if (!computedPath.get("key").isConstantExpression()) {
+      const ident = path.scope.generateUidIdentifierBasedOnNode(
+        computedNode.key,
+      );
+      declarations.push(
+        t.variableDeclaration("var", [
+          t.variableDeclarator(ident, computedNode.key),
+        ]),
+      );
+      computedNode.key = t.cloneNode(ident);
+    }
+  }
+
+  return declarations;
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/loose-not-overwritten/input.js

@@ -0,0 +1,3 @@
+class A {
+  foo;
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/loose-not-overwritten/options.json

@@ -0,0 +1,6 @@
+{
+  "plugins": [
+    ["proposal-class-properties", { "loose": true }, "name 1"],
+    ["proposal-class-properties", { "loose": false }, "name 2"]
+  ]
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/loose-not-overwritten/output.js

@@ -0,0 +1,6 @@
+class A {
+  constructor() {
+    this.foo = void 0;
+  }
+
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/recursive-class-property-type-challenge/input.js

@@ -0,0 +1,7 @@
+const sym = Symbol();
+const sym1 = Symbol();
+
+class A {
+  [sym]: A.B;
+  [sym1]: Array<A>;
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/recursive-class-property-type-challenge/options.json

@@ -0,0 +1,8 @@
+{
+  "presets": [
+    "flow"
+  ],
+  "plugins": [
+    "proposal-class-properties"
+  ]
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/recursive-class-property-type-challenge/output.js

@@ -0,0 +1,13 @@
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+const sym = Symbol();
+const sym1 = Symbol();
+
+class A {
+  constructor() {
+    _defineProperty(this, sym, void 0);
+
+    _defineProperty(this, sym1, void 0);
+  }
+
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/recursive-class-property-type/input.js

@@ -0,0 +1,5 @@
+const sym = Symbol();
+
+class A {
+  [sym]: A;
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/recursive-class-property-type/options.json

@@ -0,0 +1,8 @@
+{
+  "presets": [
+    "flow"
+  ],
+  "plugins": [
+    "proposal-class-properties"
+  ]
+}