v7.3.3

Bumps to 7.3.2 the version of `@babel/plugin-transform-typescript` used by `@babel/preset-typescript`.

This allows us to use `@babel/preset-typescript` and pick up at least one useful bug fix (#9095).

A similar PR (#9181) was closed as it bumped to a version that didn't have changes. However reading the comments from that PR, I get the sense that bumping the version in this manner should not be necessary, and should be handled by Lerna. Is this correct?

Please let me know if I can make any improvements to this PR, the description or if there's anything else I can do to help.

.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: ''
 
 ---
 

.github/actions/filter-commit-message/Dockerfile

@@ -0,0 +1,16 @@
+FROM debian:stable-slim
+
+LABEL "name"="filter"
+LABEL "version"="1.1.0"
+
+LABEL "com.github.actions.name"="Filter commit message"
+LABEL "com.github.actions.description"="Stop a workflow if the message of the current commit doesn't match the pattern"
+LABEL "com.github.actions.icon"="filter"
+LABEL "com.github.actions.color"="gray-dark"
+
+ADD entrypoint.sh /action/entrypoint.sh
+
+RUN chmod +x /action/entrypoint.sh
+RUN apt-get update && apt-get install -y --no-install-recommends git
+
+ENTRYPOINT ["/action/entrypoint.sh"]

.github/actions/filter-commit-message/entrypoint.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+set -e
+
+pattern=$1
+message=$(git log --oneline --format=%B -1 $GITHUB_SHA)
+
+if echo "$message" | grep -Pq "$pattern"; then
+  echo "INFO: $message matches $pattern"
+  exit 0
+else
+  echo "INFO: $message does not match $pattern"
+  # 78 is the "neutral" exit status
+  exit 78
+fi

.github/actions/trigger-github-release/Dockerfile

@@ -0,0 +1,18 @@
+FROM node:10
+
+LABEL "name" = "trigger-github-release"
+LABEL "version" = "0.0.1"
+
+LABEL "com.github.actions.name" = "Trigger GitHub release"
+LABEL "com.github.actions.description" = "Trigger a new GitHub release and generate the changelog using lerna-changelog."
+LABEL "com.github.actions.icon" = "tag"
+LABEL "com.github.actions.color" = "yellow"
+
+ADD entrypoint.sh /action/entrypoint.sh
+ADD package.json /action/package.json
+ADD package-lock.json /action/package-lock.json
+ADD release.js /action/release.js
+
+RUN chmod +x /action/entrypoint.sh
+
+ENTRYPOINT ["/action/entrypoint.sh"]

.github/actions/trigger-github-release/entrypoint.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+set -e
+
+echo "INFO: Installing action dependencies..."
+(cd /action; npm ci)
+
+echo "INFO: Checking out current commit..."
+git -c advice.detachedHead=false checkout $GITHUB_SHA
+
+# GitHub doesn't support running actions on new tags yet: we need to run it on the commit.
+# For this reason, we can't be sure that the tag already exists. We can use the commit
+# message to create the tag. If the tag already exists locally, they won't conflict because
+# they have the same name and are on the same commit.
+echo "INFO: Getting release version..."
+# current_tag=$(git describe --abbrev=0 --tags HEAD)
+current_tag=$(git log --oneline --format=%B -1 HEAD)
+
+echo "INFO: Creating new tag..."
+(git tag $current_tag $GITHUB_SHA) || echo "INFO: Tag already exists"
+
+last_tag=$(git describe --abbrev=0 --tags HEAD^)
+echo "INFO: New version is $current_tag; last version is $last_tag."
+
+echo "INFO: Generating the changelog..."
+
+# lerna-changelog expects the token to be provided as GITHUB_AUTH,
+# but GitHub actions don't allow to predefine custom env vars prefixed with
+# GITHUB_. We need to define it here.
+changelog=$(
+  GITHUB_AUTH="$GITHUB_TOKEN" \
+  node /action/node_modules/.bin/lerna-changelog --tag-from $last_tag --tag-to $current_tag
+)
+
+echo "INFO: Publishing the new GitHub release..."
+echo "$changelog" | node /action/release $current_tag
+
+echo "INFO: Done! Don't forget to thank new contributors :)"

.github/actions/trigger-github-release/package.json

@@ -0,0 +1,12 @@
+{
+    "private": true,
+    "name": "@internal/trigger-github-release",
+    "version": "0.0.1",
+    "author": "Nicolò Ribaudo <nicolo.ribaudo@gmail.com>",
+    "license": "MIT",
+    "dependencies": {
+        "@octokit/rest": "^16.3.0",
+        "get-stdin": "^6.0.0",
+        "lerna-changelog": "^0.8.2"
+    }
+}

.github/actions/trigger-github-release/release.js

@@ -0,0 +1,25 @@
+"use strict";
+
+const [ /* node */, /* file */, tag ] = process.argv;
+
+const getStdin = require("get-stdin");
+const octokit = require("@octokit/rest")();
+
+octokit.authenticate({
+  type: "token",
+  token: process.env.GITHUB_TOKEN
+});
+
+const [ repoOwner, repoName ] = process.env.GITHUB_REPOSITORY.split("/");
+
+getStdin()
+  .then(changelog => octokit.repos.createRelease({
+    owner: repoOwner,
+    repo: repoName,
+    tag_name: tag,
+    body: changelog,
+  }))
+  .catch(err => {
+    console.error(err);
+    process.exit(1);
+  });

.github/main.workflow

@@ -0,0 +1,28 @@
+workflow "Release" {
+  on = "push"
+  resolves = ["Trigger GitHub release"]
+}
+
+action "Trigger GitHub release" {
+  uses = "./.github/actions/trigger-github-release/"
+  secrets = ["GITHUB_TOKEN"]
+
+  # When GitHub Actions will support the "release" event for public
+  # repositories, we won't need these checks anymore.
+  needs = [
+    "Is version commit",
+    "On master branch",
+  ]
+}
+
+action "Is version commit" {
+  uses = "./.github/actions/filter-commit-message"
+  # This regex is run using "grep -P".
+  # The (-\\S+) part is for 7.0.0-beta.1 releases.
+  args = "^v(\\d+\\.){2}\\d+(-\\S+)?$"
+}
+
+action "On master branch" {
+  uses = "actions/bin/filter@master"
+  args = "branch master"
+}

.gitignore

@@ -1,5 +1,6 @@
 .DS_Store
 /node_modules
+/.github/actions/*/node_modules
 /packages/*/node_modules
 /packages/*/LICENSE
 !/packages/babel-parser/LICENSE
@@ -15,6 +16,7 @@ coverage
 dist
 /.package.json
 package-lock.json
+!/.github/actions/*/package-lock.json
 
 /packages/babel-runtime/helpers/*.js
 !/packages/babel-runtime/helpers/toArray.js

.prettierignore

@@ -1,2 +1,5 @@
 package.json
 packages/babel-preset-env/data
+packages/*/test/fixtures/**/input.*
+packages/*/test/fixtures/**/exec.*
+packages/*/test/fixtures/**/output.*

.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 +15,164 @@ 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`).

Gulpfile.js

@@ -6,7 +6,7 @@ const chalk = require("chalk");
 const newer = require("gulp-newer");
 const babel = require("gulp-babel");
 const gulpWatch = require("gulp-watch");
-const gutil = require("gulp-util");
+const fancyLog = require("fancy-log");
 const filter = require("gulp-filter");
 const gulp = require("gulp");
 const path = require("path");
@@ -17,8 +17,7 @@ const source = require("vinyl-source-stream");
 const buffer = require("vinyl-buffer");
 const rollupBabel = require("rollup-plugin-babel");
 const rollupNodeResolve = require("rollup-plugin-node-resolve");
-const registerStandalonePackageTask = require("./scripts/gulp-tasks")
-  .registerStandalonePackageTask;
+const { registerStandalonePackageTask } = require("./scripts/gulp-tasks");
 
 const sources = ["codemods", "packages"];
 
@@ -38,7 +37,7 @@ function getIndexFromPackage(name) {
 
 function compilationLogger(rollup) {
   return through.obj(function(file, enc, callback) {
-    gutil.log(
+    fancyLog(
       `Compiling '${chalk.cyan(file.relative)}'${
         rollup ? " with rollup " : ""
       }...`
@@ -50,7 +49,7 @@ function compilationLogger(rollup) {
 function errorsLogger() {
   return plumber({
     errorHandler(err) {
-      gutil.log(err.stack);
+      fancyLog(err.stack);
     },
   });
 }
@@ -138,7 +137,7 @@ registerStandalonePackageTask(
   "babel",
   "Babel",
   path.join(__dirname, "packages"),
-  require("./packages/babel-core/package.json").version
+  require("./packages/babel-standalone/package.json").version
 );
 
 const presetEnvWebpackPlugins = [
@@ -167,6 +166,6 @@ registerStandalonePackageTask(
   "babel-preset-env",
   "babelPresetEnv",
   path.join(__dirname, "packages"),
-  require("./packages/babel-preset-env/package.json").version,
+  require("./packages/babel-preset-env-standalone/package.json").version,
   presetEnvWebpackPlugins
 );

LICENSE

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

Makefile

@@ -1,6 +1,6 @@
 MAKEFLAGS = -j1
-FLOW_COMMIT = e192e1a4793dd8e43415fbfe8046d832cb513c8b
-TEST262_COMMIT = 69c1efd325deedf54db92a23008399e2b00fa51e
+FLOW_COMMIT = 2ac56861e3ceff9ca406ae586fbafb3480c6c0b7
+TEST262_COMMIT = 4f1155c566a222238fd86f179c6635ecb4c289bb
 
 # Fix color output until TravisCI fixes https://github.com/travis-ci/travis-ci/issues/7967
 export FORCE_COLOR = true
@@ -15,8 +15,8 @@ build: clean clean-lib
 	# call build again as the generated files might need to be compiled again.
 	./node_modules/.bin/gulp build
 	# generate flow and typescript typings
-	node scripts/generators/flow.js > ./packages/babel-types/lib/index.js.flow
-	node scripts/generators/typescript.js > ./packages/babel-types/lib/index.d.ts
+	node packages/babel-types/scripts/generators/flow.js > ./packages/babel-types/lib/index.js.flow
+	node packages/babel-types/scripts/generators/typescript.js > ./packages/babel-types/lib/index.d.ts
 ifneq ("$(BABEL_COVERAGE)", "true")
 	make build-standalone
 	make build-preset-env-standalone
@@ -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
@@ -40,7 +46,8 @@ watch: clean clean-lib
 	# development too.
 	BABEL_ENV=development ./node_modules/.bin/gulp build-no-bundle
 	node ./packages/babel-types/scripts/generateTypeHelpers.js
-	node scripts/generators/flow.js > ./packages/babel-types/lib/index.js.flow
+	node packages/babel-types/scripts/generators/flow.js > ./packages/babel-types/lib/index.js.flow
+	node packages/babel-types/scripts/generators/typescript.js > ./packages/babel-types/lib/index.d.ts
 	BABEL_ENV=development ./node_modules/.bin/gulp watch
 
 flow:
@@ -96,7 +103,7 @@ test-flow-update-whitelist:
 bootstrap-test262:
 	rm -rf ./build/test262
 	mkdir -p ./build
-	git clone --branch=master --single-branch --shallow-since=2018-11-01 https://github.com/tc39/test262.git ./build/test262
+	git clone --branch=master --single-branch --shallow-since=2010-01-10 https://github.com/tc39/test262.git ./build/test262
 	cd build/test262 && git checkout $(TEST262_COMMIT)
 
 test-test262:
@@ -123,9 +130,12 @@ prepublish:
 	make prepublish-build
 	make test
 
+new-version:
+	./node_modules/.bin/lerna version --force-publish="@babel/runtime,@babel/runtime-corejs2,@babel/standalone,@babel/preset-env-standalone"
+
+# NOTE: Run make new-version first
 publish: prepublish
-	# --only-explicit-updates
-	./node_modules/.bin/lerna publish --force-publish="@babel/runtime,@babel/runtime-corejs2" --dangerously-only-publish-explicit-updates-this-is-a-custom-flag-for-babel-and-you-should-not-be-using-it-just-deal-with-more-packages-being-published-it-is-not-a-big-deal
+	./node_modules/.bin/lerna publish from-git --require-scripts
 	make clean
 
 bootstrap: clean-all

README.md

@@ -8,12 +8,16 @@
   The compiler for writing next generation JavaScript.
 </p>
 
+<p align="center">
+    <a href="https://www.npmjs.com/package/@babel/core"><img alt="v7 npm Downloads" src="https://img.shields.io/npm/dm/@babel/core.svg?maxAge=43200&label=v7%20downloads"></a>
+  <a href="https://www.npmjs.com/package/babel-core"><img alt="v6 npm Downloads" src="https://img.shields.io/npm/dm/babel-core.svg?maxAge=43200&label=v6%20downloads"></a>
+</p>
 <p align="center">
   <a href="https://travis-ci.org/babel/babel"><img alt="Travis Status" src="https://img.shields.io/travis/babel/babel/master.svg?label=travis&maxAge=43200"></a>
   <a href="https://circleci.com/gh/babel/babel"><img alt="CircleCI Status" src="https://img.shields.io/circleci/project/github/babel/babel/master.svg?label=circle&maxAge=43200"></a>
   <a href="https://codecov.io/github/babel/babel"><img alt="Coverage Status" src="https://img.shields.io/codecov/c/github/babel/babel/master.svg?maxAge=43200"></a>
   <a href="https://slack.babeljs.io/"><img alt="Slack Status" src="https://slack.babeljs.io/badge.svg"></a>
-  <a href="https://www.npmjs.com/package/babel-core"><img alt="npm Downloads" src="https://img.shields.io/npm/dm/babel-core.svg?maxAge=43200"></a>
+  <a href="https://twitter.com/intent/follow?screen_name=babeljs"><img alt="Follow on Twitter" src="https://img.shields.io/twitter/follow/babeljs.svg?style=social&label=Follow"></a>
 </p>
 
 <h2 align="center">Supporting Babel</h2>
@@ -48,35 +52,15 @@ 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>
+<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>
+<a href="https://issuehunt.io" target="_blank"><img src="https://github.com/BoostIO/issuehunt-materials/blob/master/v1/issuehunt-logo-and-word-v1.png?raw=true" height="64"></a>
 
 ## Intro
 
@@ -103,7 +87,7 @@ Try it out at our [REPL](https://babeljs.io/repl/build/master#?code_lz=NoRgNATGD
 
 ### Who maintains Babel?
 
-Mostly a handful of volunteers! Please check out our [team page](https://babeljs.io/team)!
+Mostly a handful of volunteers, funded by you! Please check out our [team page](https://babeljs.io/team)!
 
 ### Looking for support?
 

babel.config.js

@@ -14,12 +14,16 @@ module.exports = function(api) {
   let convertESM = true;
   let ignoreLib = true;
   let includeRuntime = false;
+  const nodeVersion = "6.9";
 
   switch (env) {
     // Configs used during bundling builds.
     case "babel-parser":
       convertESM = false;
       ignoreLib = false;
+      envOpts.targets = {
+        node: nodeVersion,
+      };
       break;
     case "standalone":
       convertESM = false;
@@ -29,7 +33,7 @@ module.exports = function(api) {
     case "production":
       // Config during builds before publish.
       envOpts.targets = {
-        node: "6.9",
+        node: nodeVersion,
       };
       break;
     case "development":

codecov.yml

@@ -8,3 +8,5 @@ coverage:
         target: "80%"
     patch:
       enabled: false
+ignore:
+  - packages/babel-types/src/*/generated/index.js

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": "7.1.6",
+  "version": "7.3.3",
   "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": [

package.json

@@ -9,69 +9,71 @@
     "test": "make test"
   },
   "devDependencies": {
-    "@babel/cli": "^7.1.2",
-    "@babel/core": "^7.1.2",
-    "@babel/plugin-proposal-class-properties": "^7.1.0",
-    "@babel/plugin-proposal-export-namespace-from": "^7.0.0",
-    "@babel/plugin-proposal-numeric-separator": "^7.0.0",
-    "@babel/plugin-transform-modules-commonjs": "^7.1.0",
-    "@babel/plugin-transform-runtime": "^7.1.0",
-    "@babel/preset-env": "^7.1.0",
+    "@babel/cli": "^7.2.3",
+    "@babel/core": "^7.2.2",
+    "@babel/eslint-plugin-development": "^1.0.1",
+    "@babel/plugin-proposal-class-properties": "^7.3.0",
+    "@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": "^7.3.1",
     "@babel/preset-flow": "^7.0.0",
     "@babel/register": "^7.0.0",
-    "@babel/runtime": "^7.1.2",
-    "babel-core": "^7.0.0-0",
-    "babel-eslint": "^10.0.1",
-    "babel-jest": "^23.6.0",
-    "babel-loader": "^8.0.4",
-    "babel-plugin-transform-charcodes": "^0.1.0",
-    "browserify": "^16.2.2",
+    "@babel/runtime": "^7.3.1",
+    "babel-eslint": "^11.0.0-beta.0",
+    "babel-jest": "^24.0.0",
+    "babel-loader": "^8.0.5",
+    "babel-plugin-transform-charcodes": "^0.2.0",
+    "browserify": "^16.2.3",
     "bundle-collapser": "^1.2.1",
     "chalk": "^2.3.2",
-    "charcodes": "^0.1.0",
+    "charcodes": "^0.2.0",
     "derequire": "^2.0.2",
+    "duplicate-package-checker-webpack-plugin": "^2.1.0",
     "enhanced-resolve": "^3.0.0",
-    "eslint": "^5.6.0",
-    "eslint-config-babel": "^8.0.1",
-    "eslint-plugin-flowtype": "^2.50.1",
-    "eslint-plugin-local-rules": "0.1.0",
-    "eslint-plugin-prettier": "^2.6.2",
-    "flow-bin": "^0.82.0",
-    "graceful-fs": "^4.1.11",
+    "eslint": "^5.12.1",
+    "eslint-config-babel": "^8.0.2",
+    "eslint-plugin-flowtype": "^3.2.1",
+    "eslint-plugin-prettier": "^3.0.1",
+    "fancy-log": "^1.3.3",
+    "flow-bin": "^0.92.1",
+    "graceful-fs": "^4.1.15",
     "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-util": "^3.0.7",
-    "gulp-watch": "^5.0.0",
-    "husky": "^1.0.0-rc.15",
-    "jest": "^23.6.0",
-    "lerna": "^2.11.0",
+    "gulp-plumber": "^1.2.1",
+    "gulp-rename": "^1.4.0",
+    "gulp-uglify": "^3.0.1",
+    "gulp-watch": "^5.0.1",
+    "husky": "^1.3.1",
+    "jest": "^24.0.0",
+    "lerna": "^3.6.0",
     "lerna-changelog": "^0.5.0",
-    "lint-staged": "^7.3.0",
-    "lodash": "^4.17.10",
+    "lint-staged": "^8.1.0",
+    "lodash": "^4.17.11",
     "merge-stream": "^1.0.1",
     "output-file-sync": "^2.0.0",
-    "prettier": "^1.15.1",
-    "pump": "^1.0.2",
-    "rimraf": "^2.4.3",
+    "prettier": "^1.16.1",
+    "pump": "^3.0.0",
+    "rimraf": "^2.6.3",
     "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"
   },
@@ -106,7 +108,9 @@
       "_browser\\.js"
     ],
     "testEnvironment": "node",
-    "setupTestFrameworkScriptFile": "<rootDir>/test/testSetupFile.js",
+    "setupFilesAfterEnv": [
+      "<rootDir>/test/testSetupFile.js"
+    ],
     "transformIgnorePatterns": [
       "/node_modules/",
       "<rootDir>/packages/babel-standalone/babel(\\.min)?\\.js",
@@ -125,6 +129,10 @@
       "/test/tmp/",
       "/test/__data__/",
       "<rootDir>/build/"
-    ]
-  }
+    ],
+    "moduleNameMapper": {
+      "^@babel/([a-zA-Z0-9_-]+)$": "<rootDir>/packages/babel-$1/"
+    }
+  },
+  "dependencies": {}
 }

packages/babel-cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/cli",
-  "version": "7.1.5",
+  "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": "^7.1.5",
-    "@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. " +

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": "7.1.6",
+  "version": "7.3.3",
   "description": "Babel compiler core.",
   "main": "lib/index.js",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
@@ -34,16 +34,16 @@
   },
   "dependencies": {
     "@babel/code-frame": "^7.0.0",
-    "@babel/generator": "^7.1.6",
-    "@babel/helpers": "^7.1.5",
-    "@babel/parser": "^7.1.6",
-    "@babel/template": "^7.1.2",
-    "@babel/traverse": "^7.1.6",
-    "@babel/types": "^7.1.6",
+    "@babel/generator": "^7.3.3",
+    "@babel/helpers": "^7.2.0",
+    "@babel/parser": "^7.3.3",
+    "@babel/template": "^7.2.2",
+    "@babel/traverse": "^7.2.2",
+    "@babel/types": "^7.3.3",
     "convert-source-map": "^1.1.0",
     "debug": "^4.1.0",
     "json5": "^2.1.0",
-    "lodash": "^4.17.10",
+    "lodash": "^4.17.11",
     "resolve": "^1.3.2",
     "semver": "^5.4.1",
     "source-map": "^0.5.0"

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

@@ -54,6 +54,7 @@ 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)),
   };
 }
 

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

@@ -10,7 +10,7 @@ import {
   makeWeakCache,
   type CacheConfigurator,
 } from "../caching";
-import makeAPI from "../helpers/config-api";
+import makeAPI, { type PluginAPI } from "../helpers/config-api";
 import { makeStaticFileCache } from "./utils";
 import pathPatternToRegex from "../pattern-to-regex";
 import type { FilePackageData, RelativeConfig, ConfigFile } from "./types";
@@ -150,7 +150,7 @@ const LOADING_CONFIGS = new Set();
 
 const readConfigJS = makeStrongCache(
   (
-    filepath,
+    filepath: string,
     cache: CacheConfigurator<{
       envName: string,
       caller: CallerMetadata | void,
@@ -193,7 +193,7 @@ const readConfigJS = makeStrongCache(
     }
 
     if (typeof options === "function") {
-      options = options(makeAPI(cache));
+      options = ((options: any): (api: PluginAPI) => {})(makeAPI(cache));
 
       if (!cache.configured()) throwConfigError();
     }

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/transformation/index.js

@@ -131,6 +131,7 @@ function isThenable(val: mixed): boolean {
   return (
     !!val &&
     (typeof val === "object" || typeof val === "function") &&
+    !!val.then &&
     typeof val.then === "function"
   );
 }

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,

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-generator/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/generator",
-  "version": "7.1.6",
+  "version": "7.3.3",
   "description": "Turns an AST into code.",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://babeljs.io/",
@@ -14,14 +14,14 @@
     "lib"
   ],
   "dependencies": {
-    "@babel/types": "^7.1.6",
+    "@babel/types": "^7.3.3",
     "jsesc": "^2.5.1",
-    "lodash": "^4.17.10",
+    "lodash": "^4.17.11",
     "source-map": "^0.5.0",
     "trim-right": "^1.0.1"
   },
   "devDependencies": {
-    "@babel/helper-fixtures": "^7.0.0",
-    "@babel/parser": "^7.1.6"
+    "@babel/helper-fixtures": "^7.2.0",
+    "@babel/parser": "^7.3.3"
   }
 }

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

@@ -50,8 +50,35 @@ export function Directive(node: Object) {
   this.semicolon();
 }
 
+// These regexes match an even number of \ followed by a quote
+const unescapedSingleQuoteRE = /(?:^|[^\\])(?:\\\\)*'/;
+const unescapedDoubleQuoteRE = /(?:^|[^\\])(?:\\\\)*"/;
+
+export function DirectiveLiteral(node: Object) {
+  const raw = this.getPossibleRaw(node);
+  if (raw != null) {
+    this.token(raw);
+    return;
+  }
+
+  const { value } = node;
+
+  // NOTE: In directives we can't change escapings,
+  // because they change the behavior.
+  // e.g. "us\x65 string" (\x65 is e) is not a "use strict" directive.
+
+  if (!unescapedDoubleQuoteRE.test(value)) {
+    this.token(`"${value}"`);
+  } else if (!unescapedSingleQuoteRE.test(value)) {
+    this.token(`'${value}'`);
+  } else {
+    throw new Error(
+      "Malformed AST: it is not possible to print a directive containing" +
+        " both unescaped single and double quotes.",
+    );
+  }
+}
+
 export function InterpreterDirective(node: Object) {
   this.token(`#!${node.value}\n`);
 }
-
-export { StringLiteral as DirectiveLiteral } from "./types";

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/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

@@ -476,6 +476,21 @@ export function TSModuleBlock(node) {
   this.tsPrintBraced(node.body, node);
 }
 
+export function TSImportType(node) {
+  const { argument, qualifier, typeParameters } = node;
+  this.word("import");
+  this.token("(");
+  this.print(argument, node);
+  this.token(")");
+  if (qualifier) {
+    this.token(".");
+    this.print(qualifier, node);
+  }
+  if (typeParameters) {
+    this.print(typeParameters, node);
+  }
+}
+
 export function TSImportEqualsDeclaration(node) {
   const { isExport, id, moduleReference } = node;
   if (isExport) {

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)
   );

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/escapes/jsonEscape/input.js

@@ -1 +1,2 @@
+0; // Not a directive
 "©";

packages/babel-generator/test/fixtures/escapes/jsonEscape/output.js

@@ -1 +1,2 @@
+0;// Not a directive
 "\u00A9";

packages/babel-generator/test/fixtures/flow/interface-types/input.js

@@ -1,3 +1,4 @@
 type A = interface { p: string };
 type B = interface extends X { p: string };
 type C = interface extends X, Y { p: string };
+type D = interface extends X.Y<Z> { p: string };

packages/babel-generator/test/fixtures/flow/interface-types/output.js

@@ -6,4 +6,7 @@ type B = interface extends X {
 };
 type C = interface extends X, Y {
   p: string
-};
+};
+type D = interface extends X.Y<Z> {
+  p: string
+};

packages/babel-generator/test/fixtures/flow/type-alias/input.js

@@ -14,3 +14,5 @@ type overloads =
 ;
 
 type func = string => string;
+
+type D = X.Y<Z>;

packages/babel-generator/test/fixtures/flow/type-alias/output.js

@@ -9,3 +9,4 @@ type union = {
 };
 type overloads = (x: string) => number & (x: number) => string;
 type func = (string) => string;
+type D = X.Y<Z>;

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/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/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/typescript/types-import-type/input.js

@@ -0,0 +1,3 @@
+let x: typeof import('./x');
+let Y: import('./y').Y;
+let z: import("/z").foo.bar<string>;

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

@@ -0,0 +1,3 @@
+let x: typeof import('./x');
+let Y: import('./y').Y;
+let z: import("/z").foo.bar<string>;

packages/babel-generator/test/index.js

@@ -384,6 +384,48 @@ describe("programmatic generation", function() {
   [key: any]: number
 }`);
   });
+
+  describe("directives", function() {
+    it("preserves escapes", function() {
+      const directive = t.directive(
+        t.directiveLiteral(String.raw`us\x65 strict`),
+      );
+      const output = generate(directive).code;
+
+      expect(output).toBe(String.raw`"us\x65 strict";`);
+    });
+
+    it("preserves escapes in minified output", function() {
+      // https://github.com/babel/babel/issues/4767
+
+      const directive = t.directive(t.directiveLiteral(String.raw`foo\n\t\r`));
+      const output = generate(directive, { minified: true }).code;
+
+      expect(output).toBe(String.raw`"foo\n\t\r";`);
+    });
+
+    it("unescaped single quote", function() {
+      const directive = t.directive(t.directiveLiteral(String.raw`'\'\"`));
+      const output = generate(directive).code;
+
+      expect(output).toBe(String.raw`"'\'\"";`);
+    });
+
+    it("unescaped double quote", function() {
+      const directive = t.directive(t.directiveLiteral(String.raw`"\'\"`));
+      const output = generate(directive).code;
+
+      expect(output).toBe(String.raw`'"\'\"';`);
+    });
+
+    it("unescaped single and double quotes together throw", function() {
+      const directive = t.directive(t.directiveLiteral(String.raw`'"`));
+
+      expect(() => {
+        generate(directive);
+      }).toThrow();
+    });
+  });
 });
 
 describe("CodeGenerator", function() {

packages/babel-helper-builder-react-jsx/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/helper-builder-react-jsx",
-  "version": "7.0.0",
+  "version": "7.3.0",
   "description": "Helper function to build react jsx",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-helper-builder-react-jsx",
   "license": "MIT",
@@ -9,7 +9,7 @@
   },
   "main": "lib/index.js",
   "dependencies": {
-    "@babel/types": "^7.0.0",
+    "@babel/types": "^7.3.0",
     "esutils": "^2.0.0"
   }
 }

packages/babel-helper-builder-react-jsx/src/index.js

@@ -19,6 +19,13 @@ You can turn on the 'throwIfNamespace' flag to bypass this warning.`,
       );
     }
   };
+
+  visitor.JSXSpreadChild = function(path) {
+    throw path.buildCodeFrameError(
+      "Spread children are not supported in React.",
+    );
+  };
+
   visitor.JSXElement = {
     exit(path, file) {
       const callExpr = buildElementCall(path, file);

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

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

@@ -0,0 +1,31 @@
+{
+  "name": "@babel/helper-create-class-features-plugin",
+  "version": "7.3.2",
+  "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",
+    "@babel/helper-split-export-declaration": "^7.0.0"
+  },
+  "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 +1,164 @@
+import { types as t, template } from "@babel/core";
+import ReplaceSupers from "@babel/helper-replace-supers";
+import nameFunction from "@babel/helper-function-name";
+
+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 method(key, body) {
+  return t.objectMethod(
+    "method",
+    t.identifier(key),
+    [],
+    t.blockStatement(body),
+  );
+}
+
+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)),
+  ].filter(Boolean);
+
+  if (isMethod) {
+    const id = node.computed ? null : node.key;
+    t.toExpression(node);
+    properties.push(prop("value", nameFunction({ node, id, scope }) || node));
+  } else if (node.value) {
+    properties.push(
+      method("value", template.statements.ast`return ${node.value}`),
+    );
+  } else {
+    properties.push(prop("value", scope.buildUndefinedNode()));
+  }
+
+  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 +1,93 @@
+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.node)) {
+    if (!hasFeature(file, FEATURES.decorators)) {
+      throw path.buildCodeFrameError(
+        "Decorators are not enabled." +
+          "\nIf you are using " +
+          '["@babel/plugin-proposal-decorators", { "legacy": true }], ' +
+          'make sure it comes *before* "@babel/plugin-proposal-class-properties" ' +
+          "and enable loose mode, like so:\n" +
+          '\t["@babel/plugin-proposal-decorators", { "legacy": true }]\n' +
+          '\t["@babel/plugin-proposal-class-properties", { "loose": true }]',
+      );
+    }
+
+    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 (
+    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 +1,564 @@
+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) {
+    const isPrivate = prop.isPrivate();
+    const isMethod = !prop.isProperty();
+    const isInstance = !prop.node.static;
+    if (isPrivate) {
+      const { name } = prop.node.key.id;
+      const update = privateNamesMap.has(name)
+        ? privateNamesMap.get(name)
+        : {
+            id: prop.scope.generateUidIdentifier(name),
+            static: !isInstance,
+            method: isMethod,
+          };
+      if (prop.node.kind === "get") {
+        update.getId = prop.scope.generateUidIdentifier(`get_${name}`);
+      } else if (prop.node.kind === "set") {
+        update.setId = prop.scope.generateUidIdentifier(`set_${name}`);
+      } else if (prop.node.kind === "method" && isMethod && isInstance) {
+        update.methodId = prop.scope.generateUidIdentifier(name);
+      }
+      privateNamesMap.set(name, update);
+    }
+  }
+  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, getId, setId } = value;
+    if (loose) {
+      initNodes.push(
+        template.statement.ast`
+          var ${id} = ${state.addHelper("classPrivateFieldLooseKey")}("${name}")
+        `,
+      );
+    } else if (isMethod && !isStatic) {
+      if (getId || setId) {
+        initNodes.push(template.statement.ast`var ${id} = new WeakMap();`);
+      } else {
+        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,
+      getId,
+      setId,
+    } = privateNamesMap.get(name);
+
+    if (isStatic && !isMethod) {
+      return t.callExpression(
+        file.addHelper("classStaticPrivateFieldSpecGet"),
+        [this.receiver(member), t.cloneNode(classRef), t.cloneNode(id)],
+      );
+    }
+    if (isMethod) {
+      if (getId || setId) {
+        return t.callExpression(file.addHelper("classPrivateFieldGet"), [
+          this.receiver(member),
+          t.cloneNode(id),
+        ]);
+      }
+      return t.callExpression(file.addHelper("classPrivateMethodGet"), [
+        this.receiver(member),
+        t.cloneNode(id),
+        t.cloneNode(methodId),
+      ]);
+    }
+    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,
+      setId,
+    } = privateNamesMap.get(name);
+
+    if (isStatic && !isMethod) {
+      return t.callExpression(
+        file.addHelper("classStaticPrivateFieldSpecSet"),
+        [this.receiver(member), t.cloneNode(classRef), t.cloneNode(id), value],
+      );
+    }
+    if (isMethod) {
+      if (setId) {
+        return t.callExpression(file.addHelper("classPrivateFieldSet"), [
+          this.receiver(member),
+          t.cloneNode(id),
+          value,
+        ]);
+      }
+      return t.callExpression(file.addHelper("classPrivateMethodSet"), []);
+    }
+    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: ${value}
+    };
+  `;
+}
+
+function buildPrivateMethodInitLoose(ref, prop, privateNamesMap) {
+  const privateName = privateNamesMap.get(prop.node.key.id.name);
+  const { methodId, id, getId, setId, initAdded } = privateName;
+  if (initAdded) return;
+
+  if (methodId) {
+    return template.statement.ast`
+        Object.defineProperty(${ref}, ${id}, {
+          // configurable is false by default
+          // enumerable is false by default
+          // writable is false by default
+          value: ${methodId.name}
+        });
+      `;
+  }
+
+  if (getId || setId) {
+    privateNamesMap.set(prop.node.key.id.name, {
+      ...privateName,
+      initAdded: true,
+    });
+
+    if (getId && setId) {
+      return template.statement.ast`
+        Object.defineProperty(${ref}, ${id}, {
+          // configurable is false by default
+          // enumerable is false by default
+          // writable is false by default
+          get: ${getId.name},
+          set: ${setId.name}
+        });
+      `;
+    } else if (getId && !setId) {
+      return template.statement.ast`
+        Object.defineProperty(${ref}, ${id}, {
+          // configurable is false by default
+          // enumerable is false by default
+          // writable is false by default
+          get: ${getId.name}
+        });
+      `;
+    } else if (!getId && setId) {
+      return template.statement.ast`
+        Object.defineProperty(${ref}, ${id}, {
+          // configurable is false by default
+          // enumerable is false by default
+          // writable is false by default
+          set: ${setId.name}
+        });
+      `;
+    }
+  }
+}
+
+function buildPrivateInstanceMethodInitSpec(ref, prop, privateNamesMap) {
+  const privateName = privateNamesMap.get(prop.node.key.id.name);
+  const { id, getId, setId, initAdded } = privateName;
+  if (initAdded) return;
+
+  if (getId || setId) {
+    privateNamesMap.set(prop.node.key.id.name, {
+      ...privateName,
+      initAdded: true,
+    });
+
+    if (getId && setId) {
+      return template.statement.ast`
+        ${id}.set(${ref}, {
+          get: ${getId.name},
+          set: ${setId.name}
+        });
+      `;
+    } else if (getId && !setId) {
+      return template.statement.ast`
+        ${id}.set(${ref}, {
+          get: ${getId.name}
+        });
+      `;
+    } else if (!getId && setId) {
+      return template.statement.ast`
+        ${id}.set(${ref}, {
+          set: ${setId.name}
+        });
+      `;
+    }
+  }
+  return template.statement.ast`${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 privateName = privateNamesMap.get(prop.node.key.id.name);
+  const {
+    methodId,
+    getId,
+    setId,
+    getterDeclared,
+    setterDeclared,
+  } = privateName;
+  const { params, body, generator, async } = prop.node;
+  const methodValue = t.functionExpression(
+    methodId,
+    params,
+    body,
+    generator,
+    async,
+  );
+  const isGetter = getId && !getterDeclared && params.length === 0;
+  const isSetter = setId && !setterDeclared && params.length > 0;
+
+  if (isGetter) {
+    privateNamesMap.set(prop.node.key.id.name, {
+      ...privateName,
+      getterDeclared: true,
+    });
+    return t.variableDeclaration("var", [
+      t.variableDeclarator(getId, methodValue),
+    ]);
+  }
+  if (isSetter) {
+    privateNamesMap.set(prop.node.key.id.name, {
+      ...privateName,
+      setterDeclared: true,
+    });
+    return t.variableDeclaration("var", [
+      t.variableDeclarator(setId, methodValue),
+    ]);
+  }
+
+  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.unshift(
+          buildPrivateMethodInitLoose(
+            t.thisExpression(),
+            prop,
+            privateNamesMap,
+          ),
+        );
+        staticNodes.push(
+          buildPrivateInstanceMethodDeclaration(prop, privateNamesMap),
+        );
+        break;
+      case isInstance && isPrivate && isMethod && !loose:
+        instanceNodes.unshift(
+          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: instanceNodes.filter(Boolean),
+    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 +1,215 @@
+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;
+            const getName = `get ${name}`;
+            const setName = `set ${name}`;
+
+            if (path.node.kind === "get") {
+              if (
+                privateNames.has(getName) ||
+                (privateNames.has(name) && !privateNames.has(setName))
+              ) {
+                throw path.buildCodeFrameError("Duplicate private field");
+              }
+
+              privateNames.add(getName).add(name);
+            } else if (path.node.kind === "set") {
+              if (
+                privateNames.has(setName) ||
+                (privateNames.has(name) && !privateNames.has(getName))
+              ) {
+                throw path.buildCodeFrameError("Duplicate private field");
+              }
+
+              privateNames.add(setName).add(name);
+            } else {
+              if (
+                (privateNames.has(name) &&
+                  (!privateNames.has(getName) && !privateNames.has(setName))) ||
+                (privateNames.has(name) &&
+                  (privateNames.has(getName) || privateNames.has(setName)))
+              ) {
+                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 +1,4 @@
+{
+  "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 +1,4 @@
+{
+  "presets": ["flow"],
+  "plugins": ["proposal-class-properties"]
+}

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

@@ -0,0 +1,10 @@
+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();
+
+class A {
+  constructor() {
+    _defineProperty(this, sym, void 0);
+  }
+
+}

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

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

packages/babel-helper-define-map/package.json

@@ -11,6 +11,6 @@
   "dependencies": {
     "@babel/helper-function-name": "^7.1.0",
     "@babel/types": "^7.0.0",
-    "lodash": "^4.17.10"
+    "lodash": "^4.17.11"
   }
 }

packages/babel-helper-fixtures/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/helper-fixtures",
-  "version": "7.0.0",
+  "version": "7.2.0",
   "description": "Helper function to support fixtures",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "license": "MIT",
@@ -10,7 +10,7 @@
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-helper-fixtures",
   "main": "lib/index.js",
   "dependencies": {
-    "lodash": "^4.17.10",
+    "lodash": "^4.17.11",
     "semver": "^5.3.0",
     "try-resolve": "^1.0.0"
   }

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

@@ -70,7 +70,7 @@ function findFile(filepath: string, allowJSON: boolean) {
     throw new Error(`Found conflicting file matches: ${matches.join(", ")}`);
   }
 
-  return matches[0] || filepath + ".js";
+  return matches[0];
 }
 
 export default function get(entryLoc): Array<Suite> {
@@ -101,10 +101,26 @@ export default function get(entryLoc): Array<Suite> {
     }
 
     function push(taskName, taskDir) {
-      const actualLoc = findFile(taskDir + "/input");
-      const expectLoc = findFile(taskDir + "/output", true /* allowJSON */);
+      const taskDirStats = fs.statSync(taskDir);
+      let actualLoc = findFile(taskDir + "/input");
       let execLoc = findFile(taskDir + "/exec");
 
+      // If neither input nor exec is present it is not a real testcase
+      if (taskDirStats.isDirectory() && !actualLoc && !execLoc) {
+        if (fs.readdirSync(taskDir).length > 0) {
+          console.warn(`Skipped test folder with invalid layout: ${taskDir}`);
+        }
+        return;
+      } else if (!actualLoc) {
+        actualLoc = taskDir + "/input.js";
+      } else if (!execLoc) {
+        execLoc = taskDir + "/exec.js";
+      }
+
+      const expectLoc =
+        findFile(taskDir + "/output", true /* allowJSON */) ||
+        taskDir + "/output.js";
+
       const actualLocAlias =
         suiteName + "/" + taskName + "/" + path.basename(actualLoc);
       const expectLocAlias =
@@ -112,7 +128,7 @@ export default function get(entryLoc): Array<Suite> {
       let execLocAlias =
         suiteName + "/" + taskName + "/" + path.basename(actualLoc);
 
-      if (fs.statSync(taskDir).isFile()) {
+      if (taskDirStats.isFile()) {
         const ext = path.extname(taskDir);
         if (EXTENSIONS.indexOf(ext) === -1) return;
 

packages/babel-helper-module-transforms/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/helper-module-transforms",
-  "version": "7.1.0",
+  "version": "7.2.2",
   "description": "Babel helper functions for implementing ES6 module transformations",
   "author": "Logan Smyth <loganfsmyth@gmail.com>",
   "homepage": "https://babeljs.io/",
@@ -14,8 +14,8 @@
     "@babel/helper-module-imports": "^7.0.0",
     "@babel/helper-simple-access": "^7.1.0",
     "@babel/helper-split-export-declaration": "^7.0.0",
-    "@babel/template": "^7.1.0",
-    "@babel/types": "^7.0.0",
-    "lodash": "^4.17.10"
+    "@babel/template": "^7.2.2",
+    "@babel/types": "^7.2.2",
+    "lodash": "^4.17.11"
   }
 }

packages/babel-helper-module-transforms/src/normalize-and-load-metadata.js

@@ -8,6 +8,8 @@ export type ModuleMetadata = {
   // The name of the variable that will reference an object containing export names.
   exportNameListName: null | string,
 
+  hasExports: boolean,
+
   // Lookup from local binding to export information.
   local: Map<string, LocalExportMetadata>,
 
@@ -52,18 +54,7 @@ export type LocalExportMetadata = {
  * Check if the module has any exports that need handling.
  */
 export function hasExports(metadata: ModuleMetadata) {
-  const { local, source } = metadata;
-
-  return (
-    local.size > 0 ||
-    Array.from(source).some(([, meta]) => {
-      return (
-        meta.reexports.size > 0 ||
-        meta.reexportNamespace.size > 0 ||
-        !!meta.reexportAll
-      );
-    })
-  );
+  return metadata.hasExports;
 }
 
 /**
@@ -99,7 +90,10 @@ export default function normalizeModuleAndLoadMetadata(
 
   nameAnonymousExports(programPath);
 
-  const { local, source } = getModuleMetadata(programPath, { loose, lazy });
+  const { local, source, hasExports } = getModuleMetadata(programPath, {
+    loose,
+    lazy,
+  });
 
   removeModuleDeclarations(programPath);
 
@@ -127,6 +121,7 @@ export default function normalizeModuleAndLoadMetadata(
   return {
     exportName,
     exportNameListName: null,
+    hasExports,
     local,
     source,
   };
@@ -171,6 +166,7 @@ function getModuleMetadata(
     }
     return data;
   };
+  let hasExports = false;
   programPath.get("body").forEach(child => {
     if (child.isImportDeclaration()) {
       const data = getData(child.node.source);
@@ -219,6 +215,7 @@ function getModuleMetadata(
         }
       });
     } else if (child.isExportAllDeclaration()) {
+      hasExports = true;
       const data = getData(child.node.source);
       if (!data.loc) data.loc = child.node.loc;
 
@@ -226,6 +223,7 @@ function getModuleMetadata(
         loc: child.node.loc,
       };
     } else if (child.isExportNamedDeclaration() && child.node.source) {
+      hasExports = true;
       const data = getData(child.node.source);
       if (!data.loc) data.loc = child.node.loc;
 
@@ -242,6 +240,11 @@ function getModuleMetadata(
           throw exportName.buildCodeFrameError('Illegal export "__esModule".');
         }
       });
+    } else if (
+      child.isExportNamedDeclaration() ||
+      child.isExportDefaultDeclaration()
+    ) {
+      hasExports = true;
     }
   });
 
@@ -295,6 +298,7 @@ function getModuleMetadata(
   }
 
   return {
+    hasExports,
     local: localData,
     source: sourceData,
   };