Fixed semver coercing

Attempt to fix babel's assertVersion(7) from not seeing our 7.#.#.csx-.. as valid version of babel 7
Fixing peerDependencies
2019-11-14 23:00:40 +01:00 · 2019-11-12 01:02:54 +01:00 · 2019-11-11 23:46:12 +01:00 · 2019-11-11 20:28:35 +01:00 · 2019-11-11 19:17:58 +01:00 · 2019-11-11 19:08:20 +01:00
3139 changed files with 178539 additions and 5712 deletions
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@ -30,11 +30,20 @@ aliases:
  - &artifact_env_min
    path: ~/babel/packages/babel-preset-env-standalone/babel-preset-env.min.js

+  - &test262_workdir
+    working_directory: ~/babel/babel-test262-runner
+
+  - &artifact_test262_tap
+    path: ~/test262.tap
+
+  - &artifact_test262_xunit
+    path: ~/test-results
+
 jobs:
-  build:
+  test:
    working_directory: ~/babel
    docker:
-      - image: circleci/node:12
+      - image: circleci/node:13
    steps:
      - checkout
      - restore-cache: *restore-yarn-cache
@ -54,3 +63,59 @@ jobs:
      - store_artifacts: *artifact_env_min
      - save_cache: *save-node-modules-cache
      - save_cache: *save-yarn-cache
+  test262:
+    working_directory: ~/babel
+    docker:
+      - image: circleci/node:12
+    steps:
+      - checkout
+      - restore-cache: *restore-yarn-cache
+      - restore-cache: *restore-node-modules-cache
+      - run:
+          name: Build Babel
+          command: BABEL_ENV=test make bootstrap
+      - run:
+          name: Link Babel
+          command: |
+            cd packages
+            for package in */; do
+              cd $package
+              yarn link
+              cd ..
+            done
+      - run:
+          name: Setup Test Runner
+          command: |
+            git clone --recurse-submodules https://github.com/babel/babel-test262-runner
+            cd babel-test262-runner
+            yarn
+            yarn add tap-mocha-reporter --dev
+            curl -L https://github.com/stedolan/jq/releases/download/jq-1.5/jq-linux64 > jq
+            chmod +x ./jq
+            for package in ../packages/*/package.json; do
+              yarn link $(./jq -j ".name" $package)
+            done
+            node lib/download-node
+      - run:
+          name: Run Test262
+          command: node lib/run-tests I_AM_SURE | tee ~/test262.tap
+          <<: *test262_workdir
+      - store_artifacts: *artifact_test262_tap
+      - run:
+          name: Output test262 results
+          command: |
+            cat ~/test262.tap | $(npm bin)/tap-mocha-reporter spec || true
+          <<: *test262_workdir
+
+workflows:
+  version: 2
+  test:
+    jobs:
+      - test
+  master:
+    jobs:
+      - test262:
+          filters:
+            branches:
+              only:
+                - master
--- a/.flowconfig
+++ b/.flowconfig
@ -24,4 +24,6 @@ suppress_comment= \\(.\\|\n\\)*\\$FlowIgnore
 suppress_type=$FlowFixMe
 suppress_type=$FlowSubtype
 esproposal.export_star_as=enable
+esproposal.optional_chaining=enable
+esproposal.nullish_coalescing=enable
 module.name_mapper='^@babel\/\([a-zA-Z0-9_\-]+\)$' -> '<PROJECT_ROOT>/packages/babel-\1/src/index'
--- a/.github/lock.yml
+++ b/.github/lock.yml
@ -4,7 +4,7 @@
 daysUntilLock: 91
 # Comment to post before locking. Set to `false` to disable
 lockComment: false
-only: issues
+# The label to be applied when an issue is locked
 lockLabel: 'outdated'

 # Issues or pull requests with these labels will not be locked
--- a/.gitignore
+++ b/.gitignore
@ -35,7 +35,7 @@ package-lock.json
 !/packages/babel-runtime-corejs2/helpers/temporalRef.js
 /packages/babel-runtime-corejs2/helpers/esm/*.js
 !/packages/babel-runtime-corejs2/helpers/esm/toArray.js
-!/packages/babel-runtime-corejs2/helpers/esm/iterableToArray.js
+/packages/babel-runtime-corejs2/helpers/esm/iterableToArray.js
 !/packages/babel-runtime-corejs2/helpers/esm/temporalRef.js
 /packages/babel-runtime-corejs2/core-js/**/*.js
 !/packages/babel-runtime-corejs2/core-js/map.js
--- a/.travis.yml
+++ b/.travis.yml
@ -3,41 +3,43 @@ git:
 language: node_js
 cache:
  yarn: true
-node_js:
-  # We test the latest version on circleci
-  - '11'
-  - '10'
-  - '8'
-  - '6'
+
+os: linux

 env:
  global:
    - PATH=$HOME/.yarn/bin:$PATH
    - JOB=test

-before_install:
-  - curl -o- -L https://yarnpkg.com/install.sh | bash
-
-install:
-  # the `make test-ci` script runs this command already
-  - if [ "$JOB" != "test" ] && [ "$JOB" != "lint" ]; then yarn install; fi
-  - if [ "$JOB" = "lint" ]; then make bootstrap; fi
-
+install: skip
 before_script:
-  - if [ "$JOB" = "babel-parser-flow-tests" ]; then make bootstrap-flow; fi
-  - if [ "$JOB" = "babel-parser-test262-tests" ]; then make bootstrap-test262; fi
+  - curl -o- -L https://yarnpkg.com/install.sh | bash
+  - if [ "$TRAVIS_OS_NAME" = "windows" ]; then choco install make; fi

 script:
-  - if [ "$JOB" = "test" ]; then make test-ci; fi
-  - if [ "$JOB" = "lint" ]; then make lint && make flow; fi
-  - if [ "$JOB" = "babel-parser-flow-tests" ]; then make test-flow-ci; fi
-  - if [ "$JOB" = "babel-parser-test262-tests" ]; then make test-test262-ci; fi
+  - if [ "$JOB" = "test" ]; then make -j test-ci; fi
+  - if [ "$JOB" = "lint" ]; then make -j code-quality-ci; fi
+  - if [ "$JOB" = "babel-parser-flow-tests" ]; then make -j test-flow-ci; fi
+  - if [ "$JOB" = "babel-parser-test262-tests" ]; then make -j test-test262-ci; fi

 matrix:
  fast_finish: true
  include:
    - node_js: "node"
      env: JOB=lint
+    # We test the latest version on circleci
+    - node_js: "12"
+    # Move `windows` build to be the third since it is slow
+    - os: windows
+      node_js: "node"
+      env:
+        - JOB=test
+        # https://travis-ci.community/t/build-doesnt-finish-after-completing-tests/288/9
+        - YARN_GPG=no
+    # Continue node_js matrix
+    - node_js: "6"
+    - node_js: "10"
+    - node_js: "8"
    - node_js: "node"
      env: JOB=babel-parser-flow-tests
    - node_js: "node"
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -17,6 +17,219 @@ See [Babylon's CHANGELOG](packages/babylon/CHANGELOG.md) for the Babylon pre-7.0

 <!-- DO NOT CHANGE THESE COMMENTS - See .github/actions/trigger-github-release/update-changelog.js -->
 <!-- insert-new-changelog-here -->
+## v7.7.3 (2019-11-08)
+
+#### :bug: Bug Fix
+* `babel-parser`
+  * [#10682](https://github.com/babel/babel/pull/10682) Don't recover from "adjacent jsx elements" parser error ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+## v7.7.2 (2019-11-07)
+
+#### :bug: Bug Fix
+* `babel-parser`
+  * [#10669](https://github.com/babel/babel/pull/10669) Parse arrows with params annotations in conditional expressions ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-plugin-transform-typescript`
+  * [#10658](https://github.com/babel/babel/pull/10658) fix: remove accessibility of constructor ([@JLHwung](https://github.com/JLHwung))
+* `babel-traverse`
+  * [#10656](https://github.com/babel/babel/pull/10656) fix: add inList setter for compatibility with babel-minify ([@JLHwung](https://github.com/JLHwung))
+## v7.7.1 (2019-11-05)
+
+#### :bug: Bug Fix
+* `babel-types`
+  * [#10650](https://github.com/babel/babel/pull/10650) Revert "throw a TypeError if identifier validation fails (#10621)" ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-preset-env`
+  * [#10649](https://github.com/babel/babel/pull/10649) Fix(babel-preset-env): check api.caller is a function to avoid to thr… ([@love2me](https://github.com/love2me))
+
+## v7.7.0 (2019-11-05)
+
+#### :eyeglasses: Spec Compliance
+* `babel-types`
+  * [#10621](https://github.com/babel/babel/pull/10621) throw a TypeError if identifier validation fails. ([@dentrado](https://github.com/dentrado))
+* `babel-parser`
+  * [#10559](https://github.com/babel/babel/pull/10559) fix: Exclude catch clause from let identifier error. ([@gonzarodriguezt](https://github.com/gonzarodriguezt))
+  * [#10567](https://github.com/babel/babel/pull/10567) [parser] Exception to 8 and 9 in tagged template. ([@pnowak](https://github.com/pnowak))
+  * [#10532](https://github.com/babel/babel/pull/10532) Allow duplicate __proto__ keys in patterns, simple case (#6705). ([@alejo90](https://github.com/alejo90))
+
+#### :rocket: New Feature
+* `babel-generator`, `babel-helper-create-class-features-plugin`, `babel-parser`, `babel-plugin-transform-typescript`, `babel-preset-typescript`, `babel-types`
+  * [#10545](https://github.com/babel/babel/pull/10545) Add support for TS declare modifier on fields. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-core`, `babel-parser`, `babel-preset-typescript`
+  * [#10363](https://github.com/babel/babel/pull/10363) @babel/parser error recovery. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-core`
+  * [#10599](https://github.com/babel/babel/pull/10599) Add support for .cjs config files. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+  * [#10501](https://github.com/babel/babel/pull/10501) Add support for babel.config.json. ([@devongovett](https://github.com/devongovett))
+  * [#10361](https://github.com/babel/babel/pull/10361) feat: if code frame error is on a single line, highlight the whole path. ([@SimenB](https://github.com/SimenB))
+* `babel-plugin-syntax-top-level-await`, `babel-preset-env`
+  * [#10573](https://github.com/babel/babel/pull/10573) Create @babel/plugin-syntax-top-level-await. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-helper-builder-react-jsx`, `babel-plugin-transform-react-jsx`, `babel-preset-react`
+  * [#10572](https://github.com/babel/babel/pull/10572) [transform-react-jsx] Add useSpread option to transform JSX. ([@ivandevp](https://github.com/ivandevp))
+* `babel-generator`, `babel-parser`, `babel-plugin-proposal-decorators`, `babel-plugin-syntax-flow`, `babel-types`
+  * [#10344](https://github.com/babel/babel/pull/10344) Flow enums parsing. ([@gkz](https://github.com/gkz))
+* `babel-plugin-transform-function-name`, `babel-plugin-transform-modules-umd`, `babel-preset-env`
+  * [#10477](https://github.com/babel/babel/pull/10477) Changes UMD callsite to be more likely to pass in the intended object.. ([@MicahZoltu](https://github.com/MicahZoltu))
+* `babel-parser`
+  * [#10449](https://github.com/babel/babel/pull/10449) Create parser plugin "topLevelAwait". ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+  * [#10521](https://github.com/babel/babel/pull/10521) [parser] Enable "exportNamespaceFrom" by default. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+  * [#10483](https://github.com/babel/babel/pull/10483) [parser] Add support for private fields in TypeScript. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-generator`, `babel-parser`, `babel-types`
+  * [#10543](https://github.com/babel/babel/pull/10543) add assertions signature for TypeScript. ([@tanhauhau](https://github.com/tanhauhau))
+* `babel-cli`, `babel-register`
+  * [#8622](https://github.com/babel/babel/pull/8622) Make dir for babel --out-file. ([@TrySound](https://github.com/TrySound))
+* `babel-cli`
+  * [#10399](https://github.com/babel/babel/pull/10399) Closes [#8326](https://github.com/babel/babel/issues/8326), add back --quiet option.. ([@chris-peng-1244](https://github.com/chris-peng-1244))
+
+#### :bug: Bug Fix
+* `babel-helpers`, `babel-plugin-proposal-async-generator-functions`, `babel-plugin-proposal-function-sent`, `babel-preset-env`
+  * [#10422](https://github.com/babel/babel/pull/10422) Correctly delegate .return() in async generator. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-helper-module-transforms`, `babel-plugin-transform-modules-commonjs`
+  * [#10628](https://github.com/babel/babel/pull/10628) Don't throw when destructuring into a var named as an import. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-plugin-transform-modules-systemjs`
+  * [#10638](https://github.com/babel/babel/pull/10638) fix: remove ExportNamedDeclaration when the specifier is empty. ([@JLHwung](https://github.com/JLHwung))
+* `babel-parser`
+  * [#10631](https://github.com/babel/babel/pull/10631) [TS] Parse calls with type args in optional chains. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+  * [#10607](https://github.com/babel/babel/pull/10607) fixed missing errors on assignment pattern in object expression. ([@vivek12345](https://github.com/vivek12345))
+  * [#10594](https://github.com/babel/babel/pull/10594) [parser] Parse only modifiers of actual methods. ([@gonzarodriguezt](https://github.com/gonzarodriguezt))
+* `babel-plugin-transform-typescript`
+  * [#10555](https://github.com/babel/babel/pull/10555) [TS] Correctly transform computed strings and templates in enums. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-core`
+  * [#10623](https://github.com/babel/babel/pull/10623) Fix: inputSourceMap should work when it is an external file. ([@JLHwung](https://github.com/JLHwung))
+  * [#10539](https://github.com/babel/babel/pull/10539) fix: remove filename annotation in buildCodeFrameError. ([@JLHwung](https://github.com/JLHwung))
+* `babel-plugin-proposal-decorators`
+  * [#10578](https://github.com/babel/babel/pull/10578) [decorators] fix: support string literal properties. ([@mwhitworth](https://github.com/mwhitworth))
+* `babel-helpers`, `babel-plugin-proposal-dynamic-import`, `babel-plugin-transform-modules-commonjs`, `babel-preset-env`
+  * [#10574](https://github.com/babel/babel/pull/10574) fix: _interopRequireWildcard should only cache objects. ([@samMeow](https://github.com/samMeow))
+* `babel-traverse`
+  * [#9777](https://github.com/babel/babel/pull/9777) [traverse] Allow skipping nodes inserted with .replaceWith(). ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-preset-env`
+  * [#10146](https://github.com/babel/babel/pull/10146) Inject core-js@3 imports in Program:exit instead of on post(). ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-generator`
+  * [#10519](https://github.com/babel/babel/pull/10519) Fix generator missing parens around an arrow returning function type. ([@existentialism](https://github.com/existentialism))
+* `babel-plugin-transform-async-to-generator`, `babel-preset-env`, `babel-traverse`
+  * [#9939](https://github.com/babel/babel/pull/9939) Don't use args rest/spread to hoist super method calls. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+#### :nail_care: Polish
+* `babel-plugin-transform-classes`, `babel-plugin-transform-regenerator`, `babel-preset-env`
+  * [#9481](https://github.com/babel/babel/pull/9481) [preset-env] Don't use async-to-generator when already using regenerator. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-helpers`, `babel-plugin-transform-modules-commonjs`, `babel-preset-env`
+  * [#10585](https://github.com/babel/babel/pull/10585) fix(babel‑helpers/interopRequireWildcard): Avoid double nullish check. ([@ExE-Boss](https://github.com/ExE-Boss))
+* `babel-register`
+  * [#10557](https://github.com/babel/babel/pull/10557) fix: disable caching when babel could not read/write cache. ([@JLHwung](https://github.com/JLHwung))
+
+#### :house: Internal
+* `babel-cli`, `babel-node`
+  * [#10619](https://github.com/babel/babel/pull/10619) chore: remove output-file-sync dependency. ([@JLHwung](https://github.com/JLHwung))
+* `babel-register`
+  * [#10614](https://github.com/babel/babel/pull/10614) chore: bump source-map-support to 0.5.14. ([@JLHwung](https://github.com/JLHwung))
+* `babel-helper-create-regexp-features-plugin`, `babel-plugin-proposal-unicode-property-regex`, `babel-plugin-transform-dotall-regex`, `babel-plugin-transform-named-capturing-groups-regex`, `babel-plugin-transform-unicode-regex`, `babel-preset-env`
+  * [#10447](https://github.com/babel/babel/pull/10447) Merge multiple regex transform plugin. ([@JLHwung](https://github.com/JLHwung))
+* `babel-preset-env`
+  * [#10612](https://github.com/babel/babel/pull/10612) chore: update web.immediate support fixtures. ([@JLHwung](https://github.com/JLHwung))
+* `babel-helper-module-imports`
+  * [#10608](https://github.com/babel/babel/pull/10608) Use .find instead of .filter to get targetPath in ImportInjector. ([@Andarist](https://github.com/Andarist))
+* Other
+  * [#10600](https://github.com/babel/babel/pull/10600) Test node@13 on circle. ([@existentialism](https://github.com/existentialism))
+  * [#10593](https://github.com/babel/babel/pull/10593) chore: replace outdated travis-ci.org badges [ci skip]. ([@JLHwung](https://github.com/JLHwung))
+  * [#10591](https://github.com/babel/babel/pull/10591) chore: test against Node.js 13. ([@JLHwung](https://github.com/JLHwung))
+  * [#10556](https://github.com/babel/babel/pull/10556) Add master branch workflow for test262 tests. ([@jbhoosreddy](https://github.com/jbhoosreddy))
+  * [#10553](https://github.com/babel/babel/pull/10553) chore: introduce envinfo into environment section. ([@JLHwung](https://github.com/JLHwung))
+* `babel-runtime`
+  * [#10418](https://github.com/babel/babel/pull/10418) docs: add homepage link. ([@DanArthurGallagher](https://github.com/DanArthurGallagher))
+* `babel-helper-annotate-as-pure`, `babel-helper-bindify-decorators`, `babel-helper-builder-binary-assignment-operator-visitor`, `babel-helper-builder-react-jsx`, `babel-helper-call-delegate`, `babel-helper-define-map`, `babel-helper-explode-assignable-expression`, `babel-helper-explode-class`, `babel-helper-function-name`, `babel-helper-get-function-arity`, `babel-helper-hoist-variables`, `babel-helper-member-expression-to-functions`, `babel-helper-module-imports`, `babel-helper-module-transforms`, `babel-helper-optimise-call-expression`, `babel-helper-remap-async-to-generator`, `babel-helper-replace-supers`, `babel-helper-simple-access`, `babel-helper-split-export-declaration`, `babel-helper-wrap-function`, `babel-helpers`, `babel-template`
+  * [#10568](https://github.com/babel/babel/pull/10568) Bump babel-types to ^7.6.3. ([@JLHwung](https://github.com/JLHwung))
+
+#### :running_woman: Performance
+* `babel-traverse`
+  * [#10480](https://github.com/babel/babel/pull/10480) Traverse performance. ([@JLHwung](https://github.com/JLHwung))
+
+## v7.6.4 (2019-10-10)
+
+#### :eyeglasses: Spec Compliance
+* `babel-parser`
+  * [#10491](https://github.com/babel/babel/pull/10491) Trailing comma after rest - The final fix ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+#### :bug: Bug Fix
+* `babel-cli`, `babel-core`, `babel-generator`, `babel-helper-transform-fixture-test-runner`
+  * [#10536](https://github.com/babel/babel/pull/10536) Revert "chore: Upgrade source-map to 0.6.1 (#10446)" ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+## v7.6.3 (2019-10-08)
+
+#### :eyeglasses: Spec Compliance
+* `babel-parser`
+  * [#10469](https://github.com/babel/babel/pull/10469) Disallow await inside async arrow params ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+  * [#10493](https://github.com/babel/babel/pull/10493) [parser] Disallow numeric separators in legacy octal like integers ([@gonzarodriguezt](https://github.com/gonzarodriguezt))
+
+#### :rocket: New Feature
+* `babel-types`
+  * [#10504](https://github.com/babel/babel/pull/10504) Add declarations for more of @babel/types exports ([@Jessidhia](https://github.com/Jessidhia))
+
+#### :bug: Bug Fix
+* `babel-plugin-transform-block-scoping`
+  * [#10343](https://github.com/babel/babel/pull/10343) Do not remove let bindings even they are wrapped in closure ([@JLHwung](https://github.com/JLHwung))
+* `babel-parser`
+  * [#10119](https://github.com/babel/babel/pull/10119) add scope to TSModuleDeclaration ([@tanhauhau](https://github.com/tanhauhau))
+  * [#10332](https://github.com/babel/babel/pull/10332) Do not allow member expressions to start async arrows ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+  * [#10490](https://github.com/babel/babel/pull/10490) [parser] Don't crash on comment after trailing comma after elision ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-plugin-transform-react-constant-elements`, `babel-traverse`
+  * [#10529](https://github.com/babel/babel/pull/10529) Do not hoist jsx referencing a mutable binding ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-generator`, `babel-parser`, `babel-plugin-transform-block-scoping`, `babel-plugin-transform-flow-comments`, `babel-plugin-transform-flow-strip-types`, `babel-plugin-transform-typescript`
+  * [#10220](https://github.com/babel/babel/pull/10220) Flow: interface identifier should be declared in the scope ([@JLHwung](https://github.com/JLHwung))
+
+#### :nail_care: Polish
+* `babel-core`
+  * [#10419](https://github.com/babel/babel/pull/10419) assertNoDuplicates throw with more context ([@hjdivad](https://github.com/hjdivad))
+  * [#10511](https://github.com/babel/babel/pull/10511) Add filename to transform error ([@JLHwung](https://github.com/JLHwung))
+
+#### :house: Internal
+* Other
+  * [#10506](https://github.com/babel/babel/pull/10506) Use `make -j` for parallel build ([@JLHwung](https://github.com/JLHwung))
+  * [#10443](https://github.com/babel/babel/pull/10443) perf: only apply lazy cjs module transform on cli and core ([@JLHwung](https://github.com/JLHwung))
+  * [#10494](https://github.com/babel/babel/pull/10494) Enable optional chaining and nullish coalescing plugins ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-cli`, `babel-core`, `babel-generator`, `babel-helper-fixtures`, `babel-helper-transform-fixture-test-runner`, `babel-node`, `babel-plugin-transform-react-jsx-source`, `babel-plugin-transform-runtime`, `babel-preset-env`, `babel-preset-react`
+  * [#10249](https://github.com/babel/babel/pull/10249) Add windows to travis ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+#### :running_woman: Performance
+* `babel-parser`
+  * [#10371](https://github.com/babel/babel/pull/10371) perf: replace lookahead by lookaheadCharCode ([@JLHwung](https://github.com/JLHwung))
+* Other
+  * [#10443](https://github.com/babel/babel/pull/10443) perf: only apply lazy cjs module transform on cli and core ([@JLHwung](https://github.com/JLHwung))
+## v7.6.2 (2019-09-23)
+
+#### :eyeglasses: Spec Compliance
+* `babel-parser`
+  * [#10472](https://github.com/babel/babel/pull/10472) added check to disallow super.private variable access and test case added. ([@vivek12345](https://github.com/vivek12345))
+  * [#10468](https://github.com/babel/babel/pull/10468) [parser] Disallow numeric separator in unicode scape sequences. ([@ivandevp](https://github.com/ivandevp))
+  * [#10467](https://github.com/babel/babel/pull/10467) [parser] Invalid NonOctal Decimal. ([@gonzarodriguezt](https://github.com/gonzarodriguezt))
+  * [#10461](https://github.com/babel/babel/pull/10461) [parser] Disallow static fields named `constructor`. ([@guywaldman](https://github.com/guywaldman))
+  * [#10455](https://github.com/babel/babel/pull/10455) [parser] Report escapes in kws only if they won't be used as identifiers. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+#### :bug: Bug Fix
+* `babel-parser`
+  * [#10445](https://github.com/babel/babel/pull/10445) Leave trailing comments after handling a possible trailing comma. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-cli`
+  * [#10400](https://github.com/babel/babel/pull/10400) fix: allow the process to exit naturally. ([@JLHwung](https://github.com/JLHwung))
+* `babel-core`
+  * [#10402](https://github.com/babel/babel/pull/10402) fix: pass optionLoc when validating plugin object. ([@JLHwung](https://github.com/JLHwung))
+* `babel-plugin-transform-block-scoping`, `babel-plugin-transform-spread`, `babel-traverse`
+  * [#10417](https://github.com/babel/babel/pull/10417) Do not guess relative execution status for exported fns. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+* `babel-plugin-proposal-object-rest-spread`, `babel-preset-env`
+  * [#10275](https://github.com/babel/babel/pull/10275) fix object rest in array pattern. ([@tanhauhau](https://github.com/tanhauhau))
+
+#### :house: Internal
+* `babel-plugin-transform-named-capturing-groups-regex`
+  * [#10430](https://github.com/babel/babel/pull/10430) refactor: replace regexp-tree by regexpu. ([@JLHwung](https://github.com/JLHwung))
+* Other
+  * [#10441](https://github.com/babel/babel/pull/10441) Update GitHub actions to v2. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+  * [#10427](https://github.com/babel/babel/pull/10427) chore: add lint-ts rule. ([@JLHwung](https://github.com/JLHwung))
+* `babel-helper-fixtures`
+  * [#10428](https://github.com/babel/babel/pull/10428) chore: remove tryResolve dependency. ([@JLHwung](https://github.com/JLHwung))
+* `babel-node`
+  * [#10429](https://github.com/babel/babel/pull/10429) Remove babel polyfill dependency of babel-node. ([@bdwain](https://github.com/bdwain))
+* `babel-generator`, `babel-helper-fixtures`
+  * [#10420](https://github.com/babel/babel/pull/10420) chore: remove trim-right dependency. ([@JLHwung](https://github.com/JLHwung))
+* `babel-core`, `babel-plugin-transform-runtime`, `babel-register`
+  * [#10405](https://github.com/babel/babel/pull/10405) Remove circular dependency. ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
+
+#### :running_woman: Performance
+* `babel-parser`
+  * [#10421](https://github.com/babel/babel/pull/10421) Miscellaneous perf tweak. ([@JLHwung](https://github.com/JLHwung))

 ## v7.6.1 (2019-09-06)

--- a/Gulpfile.js
+++ b/Gulpfile.js
@ -11,25 +11,20 @@ const filter = require("gulp-filter");
 const gulp = require("gulp");
 const path = require("path");
 const webpack = require("webpack");
-const merge = require("merge-stream");
 const rollup = require("rollup");
 const rollupBabel = require("rollup-plugin-babel");
 const rollupNodeResolve = require("rollup-plugin-node-resolve");
 const rollupReplace = require("rollup-plugin-replace");
 const { registerStandalonePackageTask } = require("./scripts/gulp-tasks");

-const sources = ["codemods", "packages"];
+const defaultSourcesGlob = "./@(codemods|packages)/*/src/**/*.js";

 function swapSrcWithLib(srcPath) {
  const parts = srcPath.split(path.sep);
-  parts[1] = "lib";
+  parts[2] = "lib";
  return parts.join(path.sep);
 }

-function getGlobFromSource(source) {
-  return `./${source}/*/src/**/*.js`;
-}
-
 function getIndexFromPackage(name) {
  return `${name}/src/index.js`;
 }
@ -56,12 +51,10 @@ function rename(fn) {
  });
 }

-function buildBabel(exclude) {
-  return merge(
-    sources.map(source => {
-      const base = path.join(__dirname, source);
+function buildBabel(exclude, sourcesGlob = defaultSourcesGlob) {
+  const base = __dirname;

-      let stream = gulp.src(getGlobFromSource(source), { base: base });
+  let stream = gulp.src(sourcesGlob, { base: __dirname });

  if (exclude) {
    const filters = exclude.map(p => `!**/${p}/**`);
@ -80,8 +73,6 @@ function buildBabel(exclude) {
      rename(file => path.resolve(file.base, swapSrcWithLib(file.relative)))
    )
    .pipe(gulp.dest(base));
-    })
-  );
 }

 function buildRollup(packages) {
@ -118,6 +109,9 @@ const bundles = ["packages/babel-parser"];

 gulp.task("build-rollup", () => buildRollup(bundles));
 gulp.task("build-babel", () => buildBabel(/* exclude */ bundles));
+gulp.task("build-babel-types", () =>
+  buildBabel(/* exclude */ bundles, "packages/babel-types/src/**/*.js")
+);
 gulp.task("build", gulp.parallel("build-rollup", "build-babel"));

 gulp.task("default", gulp.series("build"));
@ -128,7 +122,7 @@ gulp.task(
  "watch",
  gulp.series("build-no-bundle", function watch() {
    gulpWatch(
-      sources.map(getGlobFromSource),
+      defaultSourcesGlob,
      { debounceDelay: 200 },
      gulp.task("build-no-bundle")
    );
--- a/188
+++ b/188
@ -1,6 +1,5 @@
-MAKEFLAGS = -j1
 FLOW_COMMIT = 09669846b7a7ca5a6c23c12d56bb3bebdafd67e9
-TEST262_COMMIT = ef7fd2bc27e7c10b4a71d2edc632a2934742a13e
+TEST262_COMMIT = 8688c4ab79059c3097098605e69f1ee5eda6c409

 # Fix color output until TravisCI fixes https://github.com/travis-ci/travis-ci/issues/7967
 export FORCE_COLOR = true
@ -9,64 +8,110 @@ SOURCES = packages codemods

 .PHONY: build build-dist watch lint fix clean test-clean test-only test test-ci publish bootstrap

-build: clean clean-lib
-	./node_modules/.bin/gulp build
-	node ./packages/babel-standalone/scripts/generate.js
-	node ./packages/babel-types/scripts/generateTypeHelpers.js
-	# call build again as the generated files might need to be compiled again.
-	./node_modules/.bin/gulp build
-	# generate flow and typescript typings
-	node 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
+build: build-bundle
 ifneq ("$(BABEL_COVERAGE)", "true")
-	make build-standalone
-	make build-preset-env-standalone
+	$(MAKE) build-standalone
 endif

-build-standalone:
-	./node_modules/.bin/gulp build-babel-standalone
+build-bundle: clean clean-lib
+	yarn gulp build
+	$(MAKE) generate-standalone generate-type-helpers
+	# call build again as the generated files might need to be compiled again.
+	yarn gulp build
+	$(MAKE) build-typings
+	$(MAKE) build-dist
+
+build-bundle-ci: bootstrap-only
+	$(MAKE) build-bundle
+
+generate-standalone:
+	node packages/babel-standalone/scripts/generate.js
+
+generate-type-helpers:
+	node packages/babel-types/scripts/generateTypeHelpers.js
+
+build-typings: build-flow-typings build-typescript-typings
+
+build-flow-typings:
+	node packages/babel-types/scripts/generators/flow.js > packages/babel-types/lib/index.js.flow
+
+build-typescript-typings:
+	node packages/babel-types/scripts/generators/typescript.js > packages/babel-types/lib/index.d.ts
+
+build-standalone: build-babel-standalone build-preset-env-standalone
+
+build-standalone-ci: build-bundle-ci
+	$(MAKE) build-standalone
+
+build-babel-standalone:
+	yarn gulp build-babel-standalone

 build-preset-env-standalone:
-	./node_modules/.bin/gulp build-babel-preset-env-standalone
+	yarn gulp build-babel-preset-env-standalone

 prepublish-build-standalone:
-	BABEL_ENV=production IS_PUBLISH=true ./node_modules/.bin/gulp build-babel-standalone
+	BABEL_ENV=production IS_PUBLISH=true yarn gulp build-babel-standalone

 prepublish-build-preset-env-standalone:
-	BABEL_ENV=production IS_PUBLISH=true ./node_modules/.bin/gulp build-babel-preset-env-standalone
+	BABEL_ENV=production IS_PUBLISH=true yarn gulp build-babel-preset-env-standalone

-build-dist: build
+build-dist: build-polyfill-dist build-plugin-transform-runtime-dist
+
+build-polyfill-dist:
 	cd packages/babel-polyfill; \
 	scripts/build-dist.sh
+
+build-plugin-transform-runtime-dist:
 	cd packages/babel-plugin-transform-runtime; \
 	node scripts/build-dist.js

-watch: clean clean-lib
-
+build-no-bundle: clean clean-lib
+	BABEL_ENV=development yarn gulp build-no-bundle
 	# Ensure that build artifacts for types are created during local
 	# development too.
-	BABEL_ENV=development ./node_modules/.bin/gulp build-no-bundle
-	node ./packages/babel-types/scripts/generateTypeHelpers.js
-	node 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
+	$(MAKE) generate-type-helpers
+	$(MAKE) build-typings
+
+watch: build-no-bundle
+	BABEL_ENV=development yarn gulp watch
+
+code-quality-ci: flowcheck-ci lint-ci
+
+flowcheck-ci: bootstrap-flowcheck
+	$(MAKE) flow
+
+code-quality: flow lint

 flow:
-	./node_modules/.bin/flow check --strip-root
+	yarn flow check --strip-root
+
+bootstrap-flowcheck: bootstrap-only
+	yarn gulp build-babel-types
+	$(MAKE) build-typings
+
+lint-ci: lint-js-ci lint-ts-ci
+
+lint-js-ci: bootstrap-only
+	$(MAKE) lint-js
+
+lint-ts-ci: bootstrap-flowcheck
+	$(MAKE) lint-ts

 lint: lint-js lint-ts

 lint-js:
-	./node_modules/.bin/eslint scripts $(SOURCES) '*.js' --format=codeframe
+	yarn eslint scripts $(SOURCES) '*.js' --format=codeframe

 lint-ts:
-	./scripts/tests/typescript/lint.sh
+	scripts/tests/typescript/lint.sh

-fix: fix-json
-	./node_modules/.bin/eslint scripts $(SOURCES) '*.js' --format=codeframe --fix
+fix: fix-json fix-js
+
+fix-js:
+	yarn eslint scripts $(SOURCES) '*.js' --format=codeframe --fix

 fix-json:
-	./node_modules/.bin/prettier "{packages,codemod}/*/test/fixtures/**/options.json" --write --loglevel warn
+	yarn prettier "{packages,codemod}/*/test/fixtures/**/options.json" --write --loglevel warn

 clean: test-clean
 	rm -f .npmrc
@ -79,72 +124,80 @@ test-clean:
 	$(foreach source, $(SOURCES), \
 		$(call clean-source-test, $(source)))

+# Does not work on Windows; use "yarn jest" instead
 test-only:
 	BABEL_ENV=test ./scripts/test.sh
-	make test-clean
+	$(MAKE) test-clean

 test: lint test-only

-test-ci: bootstrap test-only
+test-ci: jest-ci

+jest-ci: build-standalone-ci
+	BABEL_ENV=test yarn jest --maxWorkers=4 --ci
+	$(MAKE) test-clean
+
+# Does not work on Windows
 test-ci-coverage: SHELL:=/bin/bash
 test-ci-coverage:
-	BABEL_COVERAGE=true BABEL_ENV=test make bootstrap
+	BABEL_COVERAGE=true BABEL_ENV=test $(MAKE) bootstrap
 	BABEL_ENV=test TEST_TYPE=cov ./scripts/test-cov.sh
 	bash <(curl -s https://codecov.io/bash) -f coverage/coverage-final.json

 bootstrap-flow:
-	rm -rf ./build/flow
-	mkdir -p ./build
-	git clone --branch=master --single-branch --shallow-since=2018-11-01 https://github.com/facebook/flow.git ./build/flow
+	rm -rf build/flow
+	mkdir -p build
+	git clone --branch=master --single-branch --shallow-since=2018-11-01 https://github.com/facebook/flow.git build/flow
 	cd build/flow && git checkout $(FLOW_COMMIT)

 test-flow:
 	node scripts/tests/flow/run_babel_parser_flow_tests.js

-test-flow-ci: bootstrap test-flow
+test-flow-ci: build-bundle-ci bootstrap-flow
+	$(MAKE) test-flow

 test-flow-update-whitelist:
 	node scripts/tests/flow/run_babel_parser_flow_tests.js --update-whitelist

 bootstrap-test262:
-	rm -rf ./build/test262
-	mkdir -p ./build
-	git clone --branch=master --single-branch --shallow-since=2019-01-01 https://github.com/tc39/test262.git ./build/test262
+	rm -rf build/test262
+	mkdir -p build
+	git clone --branch=master --single-branch --shallow-since=2019-09-01 https://github.com/tc39/test262.git build/test262
 	cd build/test262 && git checkout $(TEST262_COMMIT)

 test-test262:
 	node scripts/tests/test262/run_babel_parser_test262.js

-test-test262-ci: bootstrap test-test262
+test-test262-ci: build-bundle-ci bootstrap-test262
+	$(MAKE) test-test262

 test-test262-update-whitelist:
 	node scripts/tests/test262/run_babel_parser_test262.js --update-whitelist

+# Does not work on Windows
 clone-license:
 	./scripts/clone-license.sh

-prepublish-build:
-	make clean-lib
-	rm -rf packages/babel-runtime/helpers
-	rm -rf packages/babel-runtime-corejs2/helpers
-	rm -rf packages/babel-runtime-corejs2/core-js
-	NODE_ENV=production BABEL_ENV=production make build-dist
-	make clone-license
+prepublish-build: clean-lib clean-runtime-helpers
+	NODE_ENV=production BABEL_ENV=production $(MAKE) build
+	$(MAKE) clone-license

 prepublish:
-	make bootstrap-only
-	make prepublish-build
-	make test
+	$(MAKE) bootstrap-only
+	$(MAKE) prepublish-build
+	$(MAKE) test

 new-version:
 	git pull --rebase
-	./node_modules/.bin/lerna version --force-publish="@babel/runtime,@babel/runtime-corejs2,@babel/runtime-corejs3,@babel/standalone,@babel/preset-env-standalone"
+	yarn lerna version --force-publish="@babel/runtime,@babel/runtime-corejs2,@babel/runtime-corejs3,@babel/standalone,@babel/preset-env-standalone"
+
+publish-cerxes: prepublish
+	yarn lerna publish --registry="https://npm.cerxes.net" --force-publish --allow-branch initializers-fix --canary --preid csx --dist-tag csx

 # NOTE: Run make new-version first
 publish: prepublish
-	./node_modules/.bin/lerna publish from-git --require-scripts
-	make clean
+	yarn lerna publish from-git
+	$(MAKE) clean

 publish-ci: prepublish
 ifneq ("$(NPM_TOKEN)", "")
@ -153,23 +206,30 @@ else
 	echo "Missing NPM_TOKEN env var"
 	exit 1
 endif
-	./node_modules/.bin/lerna publish from-git --require-scripts --yes
+	yarn lerna publish from-git --yes
 	rm -f .npmrc
-	make clean
+	$(MAKE) clean

-bootstrap-only: clean-all
+bootstrap-only: lerna-bootstrap
+
+yarn-install: clean-all
 	yarn --ignore-engines
-	./node_modules/.bin/lerna bootstrap -- --ignore-engines
+
+lerna-bootstrap: yarn-install
+	yarn lerna bootstrap

 bootstrap: bootstrap-only
-	make build
-	cd packages/babel-plugin-transform-runtime; \
-	node scripts/build-dist.js
+	$(MAKE) build

 clean-lib:
 	$(foreach source, $(SOURCES), \
 		$(call clean-source-lib, $(source)))

+clean-runtime-helpers:
+	rm -rf packages/babel-runtime/helpers
+	rm -rf packages/babel-runtime-corejs2/helpers
+	rm -rf packages/babel-runtime-corejs2/core-js
+
 clean-all:
 	rm -rf node_modules
 	rm -rf package-lock.json
@ -178,7 +238,7 @@ clean-all:
 	$(foreach source, $(SOURCES), \
 		$(call clean-source-all, $(source)))

-	make clean
+	$(MAKE) clean

 define clean-source-lib
 	rm -rf $(1)/*/lib
--- a/README.md
+++ b/README.md
@ -4,16 +4,23 @@
  </a>
 </p>

+<p align="center">
+  <span style="color:darkred">
+    <b><i>WARNING</i> This is a fork of babel to test a fix for initializer-variables with class-properties (proposals-stuff)</b>
+  </span>
+</p>
+
 <p align="center">
  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://travis-ci.com/babel/babel"><img alt="Travis Status" src="https://img.shields.io/travis/com/babel/babel/master.svg?label=travis&maxAge=43200"></a>
  <a href="https://circleci.com/gh/babel/babel"><img alt="CircleCI Status" src="https://img.shields.io/circleci/project/github/babel/babel/master.svg?label=circle&maxAge=43200"></a>
  <a href="https://codecov.io/github/babel/babel"><img alt="Coverage Status" src="https://img.shields.io/codecov/c/github/babel/babel/master.svg?maxAge=43200"></a>
  <a href="https://slack.babeljs.io/"><img alt="Slack Status" src="https://slack.babeljs.io/badge.svg"></a>
--- a/babel.config.js
+++ b/babel.config.js
@ -77,9 +77,10 @@ module.exports = function(api) {
        "@babel/proposal-object-rest-spread",
        { useBuiltIns: true, loose: true },
      ],
+      "@babel/plugin-proposal-optional-chaining",
+      "@babel/plugin-proposal-nullish-coalescing-operator",

-      // Explicitly use the lazy version of CommonJS modules.
-      convertESM ? ["@babel/transform-modules-commonjs", { lazy: true }] : null,
+      convertESM ? "@babel/transform-modules-commonjs" : null,
    ].filter(Boolean),
    overrides: [
      {
@ -90,18 +91,17 @@ module.exports = function(api) {
        ],
      },
      {
-        test: "./packages/babel-register",
+        test: ["./packages/babel-cli", "./packages/babel-core"],
        plugins: [
-          // Override the root options to disable lazy imports for babel-register
-          // because otherwise the require hook will try to lazy-import things
-          // leading to dependency cycles.
-          convertESM ? "@babel/transform-modules-commonjs" : null,
+          // Explicitly use the lazy version of CommonJS modules.
+          convertESM
+            ? ["@babel/transform-modules-commonjs", { lazy: true }]
+            : null,
        ].filter(Boolean),
      },
      {
        test: "./packages/babel-polyfill",
        presets: [["@babel/env", envOptsNoTargets]],
-        plugins: [["@babel/transform-modules-commonjs", { lazy: false }]],
      },
      {
        // The vast majority of our src files are modules, but we use
--- a/codemods/babel-plugin-codemod-object-assign-to-object-spread/package.json
+++ b/codemods/babel-plugin-codemod-object-assign-to-object-spread/package.json
@ -16,7 +16,7 @@
    "@babel/plugin-syntax-object-rest-spread": "^7.0.0"
  },
  "peerDependencies": {
-    "@babel/core": "^7.0.0-0"
+    "@babel/core": "^7.0.0-0 || csx"
  },
  "devDependencies": {
    "@babel/core": "^7.0.0",
--- a/codemods/babel-plugin-codemod-optional-catch-binding/package.json
+++ b/codemods/babel-plugin-codemod-optional-catch-binding/package.json
@ -16,7 +16,7 @@
    "@babel/plugin-syntax-optional-catch-binding": "^7.0.0"
  },
  "peerDependencies": {
-    "@babel/core": "^7.0.0-0"
+    "@babel/core": "^7.0.0-0 || csx"
  },
  "devDependencies": {
    "@babel/core": "^7.0.0",
--- a/doc/design/monorepo.md
+++ b/doc/design/monorepo.md
@ -15,7 +15,7 @@ This is quite taboo but let's look at the pros and cons:
 * Easy to coordinate changes across modules.
 * Single place to report issues.
 * Easier to setup a development environment.
- * Tests across modules are run together which finds bugs that touch multiple modules easier.
+ * Tests across modules are run together which finds bugs that touch multiple modules more easily.

 **Cons:**

--- a/lerna.json
+++ b/lerna.json
@ -1,5 +1,5 @@
 {
-  "version": "7.6.2",
+  "version": "7.7.3",
  "changelog": {
    "repo": "babel/babel",
    "cacheDir": ".changelog",
@ -33,5 +33,8 @@
  "npmClient": "yarn",
  "npmClientArgs": [
    "--no-lockfile"
-  ]
+  ],
+  "publishConfig": {
+    "registry": "https://npm.cerxes.net"
+  }
 }
--- a/package.json
+++ b/package.json
@ -14,7 +14,9 @@
    "@babel/eslint-plugin-development": "^1.0.1",
    "@babel/plugin-proposal-class-properties": "^7.5.5",
    "@babel/plugin-proposal-export-namespace-from": "^7.5.2",
+    "@babel/plugin-proposal-nullish-coalescing-operator": "^7.4.4",
    "@babel/plugin-proposal-numeric-separator": "^7.2.0",
+    "@babel/plugin-proposal-optional-chaining": "^7.6.0",
    "@babel/plugin-transform-modules-commonjs": "^7.6.0",
    "@babel/plugin-transform-runtime": "^7.6.0",
    "@babel/preset-env": "^7.6.0",
@ -22,7 +24,7 @@
    "@babel/register": "^7.6.0",
    "@babel/runtime": "^7.6.0",
    "babel-eslint": "^11.0.0-beta.0",
-    "babel-jest": "^24.8.0",
+    "babel-jest": "^24.9.0",
    "babel-loader": "^8.0.6",
    "babel-plugin-transform-charcodes": "^0.2.0",
    "browserify": "^16.2.3",
@ -38,7 +40,7 @@
    "eslint-plugin-import": "^2.17.2",
    "eslint-plugin-prettier": "^3.1.0",
    "fancy-log": "^1.3.3",
-    "flow-bin": "^0.102.0",
+    "flow-bin": "^0.108.0",
    "graceful-fs": "^4.1.15",
    "gulp": "^4.0.2",
    "gulp-babel": "^8.0.0",
@ -49,12 +51,11 @@
    "gulp-uglify": "^3.0.2",
    "gulp-watch": "^5.0.1",
    "husky": "^3.0.0",
-    "jest": "^24.8.0",
+    "jest": "^24.9.0",
    "lerna": "^3.16.0",
    "lerna-changelog": "^0.5.0",
    "lint-staged": "^9.2.0",
    "lodash": "^4.17.13",
-    "merge-stream": "^1.0.1",
    "output-file-sync": "^2.0.0",
    "prettier": "^1.17.1",
    "pump": "^3.0.0",
@ -75,7 +76,7 @@
    "@lerna/**/@lerna/collect-updates": "https://github.com/babel/lerna.git#babel-collect-updates"
  },
  "engines": {
-    "node": ">= 6.9.0 < 13.0.0",
+    "node": ">= 6.9.0 < 14.0.0",
    "npm": ">= 3.x <= 6.x",
    "yarn": ">=0.27.5 || >=1.0.0-20170811"
  },
@ -115,6 +116,7 @@
    ],
    "transformIgnorePatterns": [
      "/node_modules/",
+      "/packages/babel-standalone/babel.js",
      "<rootDir>/packages/babel-standalone/babel(\\.min)?\\.js",
      "<rootDir>/packages/babel-preset-env-standalone/babel-preset-env(\\.min)?\\.js",
      "/test/(fixtures|tmp|__data__)/",
--- a/packages/babel-cli/package.json
+++ b/packages/babel-cli/package.json
@ -1,6 +1,6 @@
 {
  "name": "@babel/cli",
-  "version": "7.6.2",
+  "version": "7.7.0",
  "description": "Babel command line.",
  "author": "Sebastian McKenzie <sebmck@gmail.com>",
  "homepage": "https://babeljs.io/",
@ -24,8 +24,7 @@
    "fs-readdir-recursive": "^1.1.0",
    "glob": "^7.0.0",
    "lodash": "^4.17.13",
-    "mkdirp": "^0.5.1",
-    "output-file-sync": "^2.0.0",
+    "make-dir": "^2.1.0",
    "slash": "^2.0.0",
    "source-map": "^0.5.0"
  },
@ -33,11 +32,11 @@
    "chokidar": "^2.1.8"
  },
  "peerDependencies": {
-    "@babel/core": "^7.0.0-0"
+    "@babel/core": "^7.0.0-0 || csx"
  },
  "devDependencies": {
-    "@babel/core": "^7.6.2",
-    "@babel/helper-fixtures": "^7.6.2"
+    "@babel/core": "^7.7.0",
+    "@babel/helper-fixtures": "^7.6.3"
  },
  "bin": {
    "babel": "./bin/babel.js",
--- a/packages/babel-cli/src/babel/dir.js
+++ b/packages/babel-cli/src/babel/dir.js
@ -1,8 +1,7 @@
 // @flow

 import defaults from "lodash/defaults";
-import outputFileSync from "output-file-sync";
-import { sync as mkdirpSync } from "mkdirp";
+import { sync as makeDirSync } from "make-dir";
 import slash from "slash";
 import path from "path";
 import fs from "fs";
@ -10,6 +9,11 @@ import fs from "fs";
 import * as util from "./util";
 import { type CmdOptions } from "./options";

+function outputFileSync(filePath: string, data: string | Buffer): void {
+  makeDirSync(path.dirname(filePath));
+  fs.writeFileSync(filePath, data);
+}
+
 export default async function({
  cliOptions,
  babelOptions,
@ -122,19 +126,21 @@ export default async function({
      util.deleteDir(cliOptions.outDir);
    }

-    mkdirpSync(cliOptions.outDir);
+    makeDirSync(cliOptions.outDir);

    let compiledFiles = 0;
    for (const filename of cliOptions.filenames) {
      compiledFiles += await handle(filename);
    }

+    if (!cliOptions.quiet) {
      console.log(
        `Successfully compiled ${compiledFiles} ${
          compiledFiles !== 1 ? "files" : "file"
        } with Babel.`,
      );
    }
+  }

  if (cliOptions.watch) {
    const chokidar = util.requireChokidar();
--- a/packages/babel-cli/src/babel/file.js
+++ b/packages/babel-cli/src/babel/file.js
@ -4,6 +4,7 @@ import convertSourceMap from "convert-source-map";
 import defaults from "lodash/defaults";
 import sourceMap from "source-map";
 import slash from "slash";
+import { sync as makeDirSync } from "make-dir";
 import path from "path";
 import fs from "fs";

@ -89,6 +90,8 @@ export default async function({
    const result = buildResult(fileResults);

    if (cliOptions.outFile) {
+      makeDirSync(path.dirname(cliOptions.outFile));
+
      // we've requested for a sourcemap to be written to disk
      if (babelOptions.sourceMaps && babelOptions.sourceMaps !== "inline") {
        const mapLoc = cliOptions.outFile + ".map";
--- a/packages/babel-cli/src/babel/options.js
+++ b/packages/babel-cli/src/babel/options.js
@ -12,19 +12,19 @@ import pkg from "../../package.json";
 // Standard Babel input configs.
 commander.option(
  "-f, --filename [filename]",
-  "filename to use when reading from stdin - this will be used in source-maps, errors etc",
+  "The filename to use when reading from stdin. This will be used in source-maps, errors etc.",
 );
 commander.option(
  "--presets [list]",
-  "comma-separated list of preset names",
+  "A comma-separated list of preset names.",
  collect,
 );
 commander.option(
  "--plugins [list]",
-  "comma-separated list of plugin names",
+  "A comma-separated list of plugin names.",
  collect,
 );
-commander.option("--config-file [path]", "Path to a .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. " +
@ -40,97 +40,101 @@ commander.option(
 commander.option("--source-type [script|module]", "");
 commander.option(
  "--no-babelrc",
-  "Whether or not to look up .babelrc and .babelignore files",
+  "Whether or not to look up .babelrc and .babelignore files.",
 );
 commander.option(
  "--ignore [list]",
-  "list of glob paths to **not** compile",
+  "List of glob paths to **not** compile.",
  collect,
 );
 commander.option(
  "--only [list]",
-  "list of glob paths to **only** compile",
+  "List of glob paths to **only** compile.",
  collect,
 );

 // Misc babel config.
 commander.option(
  "--no-highlight-code",
-  "enable/disable ANSI syntax highlighting of code frames (on by default)",
+  "Enable or disable ANSI syntax highlighting of code frames. (on by default)",
 );

 // General output formatting.
 commander.option(
  "--no-comments",
-  "write comments to generated output (true by default)",
+  "Write comments to generated output. (true by default)",
 );
 commander.option(
  "--retain-lines",
-  "retain line numbers - will result in really ugly code",
+  "Retain line numbers. This will result in really ugly code.",
 );
 commander.option(
  "--compact [true|false|auto]",
-  "do not include superfluous whitespace characters and line terminators",
+  "Do not include superfluous whitespace characters and line terminators.",
  booleanify,
 );
-commander.option("--minified", "save as much bytes when printing [true|false]");
+commander.option(
+  "--minified [true|false]",
+  "Save as many bytes when printing.",
+);
 commander.option(
  "--auxiliary-comment-before [string]",
-  "print a comment before any injected non-user code",
+  "Print a comment before any injected non-user code.",
 );
 commander.option(
  "--auxiliary-comment-after [string]",
-  "print a comment after any injected non-user code",
+  "Print a comment after any injected non-user code.",
 );

 // General source map formatting.
 commander.option("-s, --source-maps [true|false|inline|both]", "", booleanify);
 commander.option(
  "--source-map-target [string]",
-  "set `file` on returned source map",
+  "Set `file` on returned source map.",
 );
 commander.option(
  "--source-file-name [string]",
-  "set `sources[0]` on returned source map",
+  "Set `sources[0]` on returned source map.",
 );
 commander.option(
  "--source-root [filename]",
-  "the root from which all sources are relative",
+  "The root from which all sources are relative.",
 );

 // Config params for certain module output formats.
 commander.option(
  "--module-root [filename]",
-  "optional prefix for the AMD module formatter that will be prepend to the filename on module definitions",
+  // eslint-disable-next-line max-len
+  "Optional prefix for the AMD module formatter that will be prepended to the filename on module definitions.",
 );
-commander.option("-M, --module-ids", "insert an explicit id for modules");
+commander.option("-M, --module-ids", "Insert an explicit id for modules.");
 commander.option(
  "--module-id [string]",
-  "specify a custom name for module ids",
+  "Specify a custom name for module ids.",
 );

 // "babel" command specific arguments that are not passed to @babel/core.
 commander.option(
  "-x, --extensions [extensions]",
-  "List of extensions to compile when a directory has been input [.es6,.js,.es,.jsx,.mjs]",
+  "List of extensions to compile when a directory has been the input. [.es6,.js,.es,.jsx,.mjs]",
  collect,
 );
 commander.option(
  "--keep-file-extension",
-  "Preserve the file extensions of the input files",
+  "Preserve the file extensions of the input files.",
 );
-commander.option("-w, --watch", "Recompile files on changes");
+commander.option("-w, --watch", "Recompile files on changes.");
 commander.option(
  "--skip-initial-build",
-  "Do not compile files before watching",
+  "Do not compile files before watching.",
 );
 commander.option(
  "-o, --out-file [out]",
-  "Compile all input files into a single file",
+  "Compile all input files into a single file.",
 );
 commander.option(
  "-d, --out-dir [out]",
-  "Compile an input directory of modules into an output directory",
+  "Compile an input directory of modules into an output directory.",
 );
 commander.option(
  "--relative",
@ -138,16 +142,23 @@ commander.option(
 );
 commander.option(
  "-D, --copy-files",
-  "When compiling a directory copy over non-compilable files",
+  "When compiling a directory copy over non-compilable files.",
 );
 commander.option(
  "--include-dotfiles",
-  "Include dotfiles when compiling and copying non-compilable files",
+  "Include dotfiles when compiling and copying non-compilable files.",
+);
+commander.option(
+  "--verbose",
+  "Log everything. This option conflicts with --quiet",
+);
+commander.option(
+  "--quiet",
+  "Don't log anything. This option conflicts with --verbose",
 );
-commander.option("--verbose", "Log everything");
 commander.option(
  "--delete-dir-on-start",
-  "Delete the out directory before compilation",
+  "Delete the out directory before compilation.",
 );

 commander.version(pkg.version + " (@babel/core " + version + ")");
@ -207,6 +218,10 @@ export default function parseArgv(args: Array<string>): CmdOptions | null {
    errors.push("--delete-dir-on-start requires --out-dir");
  }

+  if (commander.verbose && commander.quiet) {
+    errors.push("--verbose and --quiet cannot be used together");
+  }
+
  if (
    !commander.outDir &&
    filenames.length === 0 &&
@ -282,6 +297,7 @@ export default function parseArgv(args: Array<string>): CmdOptions | null {
      copyFiles: opts.copyFiles,
      includeDotfiles: opts.includeDotfiles,
      verbose: opts.verbose,
+      quiet: opts.quiet,
      deleteDirOnStart: opts.deleteDirOnStart,
      sourceMapTarget: opts.sourceMapTarget,
    },
--- a/packages/babel-cli/test/fixtures/babel/filename
+++ b/packages/babel-cli/test/fixtures/babel/filename
@ -0,0 +1 @@
+arr.map(x => x * MULTIPLIER);
--- a/packages/babel-cli/test/fixtures/babel/filename
+++ b/packages/babel-cli/test/fixtures/babel/filename
@ -0,0 +1,3 @@
+{
+  "args": ["script.js", "--out-file", "folder/nested/script.js"]
+}
--- a/packages/babel-cli/test/fixtures/babel/filename
+++ b/packages/babel-cli/test/fixtures/babel/filename
@ -0,0 +1,5 @@
+"use strict";
+
+arr.map(function (x) {
+  return x * MULTIPLIER;
+});
--- a/packages/babel-cli/test/fixtures/babel/stdin
+++ b/packages/babel-cli/test/fixtures/babel/stdin
@ -0,0 +1,5 @@
+{
+  "args": ["--filename", "test.js"],
+  "stderrContains": true,
+  "os": ["win32"]
+}
--- a/packages/babel-cli/test/fixtures/babel/stdin
+++ b/packages/babel-cli/test/fixtures/babel/stdin
@ -0,0 +1 @@
+SyntaxError: <CWD>\test.js: Unexpected token, expected ";" (2:10)
--- a/packages/babel-cli/test/fixtures/babel/stdin
+++ b/packages/babel-cli/test/fixtures/babel/stdin
@ -0,0 +1,3 @@
+arr.map(function () {
+  return $]!;
+});
--- a/packages/babel-cli/test/fixtures/babel/stdin
+++ b/packages/babel-cli/test/fixtures/babel/stdin
@ -1,4 +1,5 @@
 {
  "args": ["--filename", "test.js"],
-  "stderrContains": true
+  "stderrContains": true,
+  "os": ["linux", "darwin"]
 }
--- a/packages/babel-cli/test/index.js
+++ b/packages/babel-cli/test/index.js
@ -1,7 +1,7 @@
 const readdir = require("fs-readdir-recursive");
 const helper = require("@babel/helper-fixtures");
 const rimraf = require("rimraf");
-const outputFileSync = require("output-file-sync");
+const { sync: makeDirSync } = require("make-dir");
 const child = require("child_process");
 const merge = require("lodash/merge");
 const path = require("path");
@ -14,6 +14,11 @@ const fileFilter = function(x) {
  return x !== ".DS_Store";
 };

+const outputFileSync = function(filePath, data) {
+  makeDirSync(path.dirname(filePath));
+  fs.writeFileSync(filePath, data);
+};
+
 const presetLocs = [path.join(__dirname, "../../babel-preset-react")];

 const pluginLocs = [
@ -115,13 +120,6 @@ const buildTest = function(binName, testName, opts) {
  const binLoc = path.join(__dirname, "../lib", binName);

  return function(callback) {
-    const dir = process.cwd();
-
-    process.chdir(__dirname);
-    if (fs.existsSync(tmpLoc)) rimraf.sync(tmpLoc);
-    fs.mkdirSync(tmpLoc);
-    process.chdir(tmpLoc);
-
    saveInFiles(opts.inFiles);

    let args = [binLoc];
@ -159,7 +157,6 @@ const buildTest = function(binName, testName, opts) {
          args.map(arg => `"${arg}"`).join(" ") + ": " + err.message;
      }

-      process.chdir(dir);
      callback(err);
    });

@ -175,6 +172,26 @@ fs.readdirSync(fixtureLoc).forEach(function(binName) {

  const suiteLoc = path.join(fixtureLoc, binName);
  describe("bin/" + binName, function() {
+    let cwd;
+
+    beforeEach(() => {
+      cwd = process.cwd();
+
+      if (fs.existsSync(tmpLoc)) {
+        for (const child of fs.readdirSync(tmpLoc)) {
+          rimraf.sync(path.join(tmpLoc, child));
+        }
+      } else {
+        fs.mkdirSync(tmpLoc);
+      }
+
+      process.chdir(tmpLoc);
+    });
+
+    afterEach(() => {
+      process.chdir(cwd);
+    });
+
    fs.readdirSync(suiteLoc).forEach(function(testName) {
      if (testName.startsWith(".")) return;

@ -185,7 +202,29 @@ fs.readdirSync(fixtureLoc).forEach(function(binName) {
      };

      const optionsLoc = path.join(testLoc, "options.json");
-      if (fs.existsSync(optionsLoc)) merge(opts, require(optionsLoc));
+      if (fs.existsSync(optionsLoc)) {
+        const taskOpts = require(optionsLoc);
+        if (taskOpts.os) {
+          let os = taskOpts.os;
+
+          if (!Array.isArray(os) && typeof os !== "string") {
+            throw new Error(
+              `'os' should be either string or string array: ${taskOpts.os}`,
+            );
+          }
+
+          if (typeof os === "string") {
+            os = [os];
+          }
+
+          if (!os.includes(process.platform)) {
+            return;
+          }
+
+          delete taskOpts.os;
+        }
+        merge(opts, taskOpts);
+      }

      ["stdout", "stdin", "stderr"].forEach(function(key) {
        const loc = path.join(testLoc, key + ".txt");
@ -205,7 +244,7 @@ fs.readdirSync(fixtureLoc).forEach(function(binName) {
        opts.inFiles[".babelrc"] = helper.readFile(babelrcLoc);
      }

-      it(testName, buildTest(binName, testName, opts));
+      it(testName, buildTest(binName, testName, opts), 20000);
    });
  });
 });
--- a/packages/babel-core/package.json
+++ b/packages/babel-core/package.json
@ -1,6 +1,6 @@
 {
  "name": "@babel/core",
-  "version": "7.6.2",
+  "version": "7.7.2",
  "description": "Babel compiler core.",
  "main": "lib/index.js",
  "author": "Sebastian McKenzie <sebmck@gmail.com>",
@ -34,13 +34,13 @@
  },
  "dependencies": {
    "@babel/code-frame": "^7.5.5",
-    "@babel/generator": "^7.6.2",
-    "@babel/helpers": "^7.6.2",
-    "@babel/parser": "^7.6.2",
-    "@babel/template": "^7.6.0",
-    "@babel/traverse": "^7.6.2",
-    "@babel/types": "^7.6.0",
-    "convert-source-map": "^1.1.0",
+    "@babel/generator": "^7.7.2",
+    "@babel/helpers": "^7.7.0",
+    "@babel/parser": "^7.7.2",
+    "@babel/template": "^7.7.0",
+    "@babel/traverse": "^7.7.2",
+    "@babel/types": "^7.7.2",
+    "convert-source-map": "^1.7.0",
    "debug": "^4.1.0",
    "json5": "^2.1.0",
    "lodash": "^4.17.13",
@ -49,6 +49,6 @@
    "source-map": "^0.5.0"
  },
  "devDependencies": {
-    "@babel/helper-transform-fixture-test-runner": "^7.6.0"
+    "@babel/helper-transform-fixture-test-runner": "^7.6.4"
  }
 }
--- a/packages/babel-core/src/config/config-descriptors.js
+++ b/packages/babel-core/src/config/config-descriptors.js
@ -345,6 +345,7 @@ function assertNoDuplicates(items: Array<UnloadedDescriptor>): void {
    }

    if (nameMap.has(item.name)) {
+      const conflicts = items.filter(i => i.value === item.value);
      throw new Error(
        [
          `Duplicate plugin/preset detected.`,
@ -355,6 +356,9 @@ function assertNoDuplicates(items: Array<UnloadedDescriptor>): void {
          `    ['some-plugin', {}],`,
          `    ['some-plugin', {}, 'some unique name'],`,
          `  ]`,
+          ``,
+          `Duplicates detected are:`,
+          `${JSON.stringify(conflicts, null, 2)}`,
        ].join("\n"),
      );
    }
--- a/packages/babel-core/src/config/files/configuration.js
+++ b/packages/babel-core/src/config/files/configuration.js
@ -18,18 +18,22 @@ import type { CallerMetadata } from "../validation/options";

 const debug = buildDebug("babel:config:loading:files:configuration");

-const BABEL_CONFIG_JS_FILENAME = "babel.config.js";
+const ROOT_CONFIG_FILENAMES = [
+  "babel.config.js",
+  "babel.config.cjs",
+  "babel.config.json",
+];
+const RELATIVE_CONFIG_FILENAMES = [".babelrc", ".babelrc.js", ".babelrc.cjs"];

-const BABELRC_FILENAME = ".babelrc";
-const BABELRC_JS_FILENAME = ".babelrc.js";
 const BABELIGNORE_FILENAME = ".babelignore";

 export function findConfigUpwards(rootDir: string): string | null {
  let dirname = rootDir;
  while (true) {
-    if (fs.existsSync(path.join(dirname, BABEL_CONFIG_JS_FILENAME))) {
-      return dirname;
-    }
+    const configFileFound = ROOT_CONFIG_FILENAMES.some(filename =>
+      fs.existsSync(path.join(dirname, filename)),
+    );
+    if (configFileFound) return dirname;

    const nextDir = path.dirname(dirname);
    if (dirname === nextDir) break;
@ -51,46 +55,16 @@ export function findRelativeConfig(

  for (const loc of packageData.directories) {
    if (!config) {
-      config = [BABELRC_FILENAME, BABELRC_JS_FILENAME].reduce(
-        (previousConfig: ConfigFile | null, name) => {
-          const filepath = path.join(loc, name);
-          const config = readConfig(filepath, envName, caller);
-
-          if (config && previousConfig) {
-            throw new Error(
-              `Multiple configuration files found. Please remove one:\n` +
-                ` - ${path.basename(previousConfig.filepath)}\n` +
-                ` - ${name}\n` +
-                `from ${loc}`,
-            );
-          }
-
-          return config || previousConfig;
-        },
-        null,
-      );
-
-      const pkgConfig =
+      config = loadOneConfig(
+        RELATIVE_CONFIG_FILENAMES,
+        loc,
+        envName,
+        caller,
        packageData.pkg && packageData.pkg.dirname === loc
          ? packageToBabelConfig(packageData.pkg)
-          : null;
-
-      if (pkgConfig) {
-        if (config) {
-          throw new Error(
-            `Multiple configuration files found. Please remove one:\n` +
-              ` - ${path.basename(pkgConfig.filepath)}#babel\n` +
-              ` - ${path.basename(config.filepath)}\n` +
-              `from ${loc}`,
+          : null,
      );
    }
-        config = pkgConfig;
-      }
-
-      if (config) {
-        debug("Found configuration %o from %o.", config.filepath, dirname);
-      }
-    }

    if (!ignore) {
      const ignoreLoc = path.join(loc, BABELIGNORE_FILENAME);
@ -110,13 +84,36 @@ export function findRootConfig(
  envName: string,
  caller: CallerMetadata | void,
 ): ConfigFile | null {
-  const filepath = path.resolve(dirname, BABEL_CONFIG_JS_FILENAME);
+  return loadOneConfig(ROOT_CONFIG_FILENAMES, dirname, envName, caller);
+}

-  const conf = readConfig(filepath, envName, caller);
-  if (conf) {
-    debug("Found root config %o in %o.", BABEL_CONFIG_JS_FILENAME, dirname);
+function loadOneConfig(
+  names: string[],
+  dirname: string,
+  envName: string,
+  caller: CallerMetadata | void,
+  previousConfig?: ConfigFile | null = null,
+): ConfigFile | null {
+  const config = names.reduce((previousConfig: ConfigFile | null, name) => {
+    const filepath = path.resolve(dirname, name);
+    const config = readConfig(filepath, envName, caller);
+
+    if (config && previousConfig) {
+      throw new Error(
+        `Multiple configuration files found. Please remove one:\n` +
+          ` - ${path.basename(previousConfig.filepath)}\n` +
+          ` - ${name}\n` +
+          `from ${dirname}`,
+      );
    }
-  return conf;
+
+    return config || previousConfig;
+  }, previousConfig);
+
+  if (config) {
+    debug("Found configuration %o from %o.", config.filepath, dirname);
+  }
+  return config;
 }

 export function loadConfig(
@ -141,7 +138,8 @@ export function loadConfig(
 * throw if there are parsing errors while loading a config.
 */
 function readConfig(filepath, envName, caller): ConfigFile | null {
-  return path.extname(filepath) === ".js"
+  const ext = path.extname(filepath);
+  return ext === ".js" || ext === ".cjs"
    ? readConfigJS(filepath, { envName, caller })
    : readConfigJSON5(filepath);
 }
--- a/packages/babel-core/src/config/helpers/config-api.js
+++ b/packages/babel-core/src/config/helpers/config-api.js
@ -70,7 +70,7 @@ function assertVersion(range: string | number): void {
    throw new Error("Expected string or integer value.");
  }

-  if (semver.satisfies(coreVersion, range)) return;
+  if (semver.satisfies(semver.coerce(coreVersion).raw, range)) return;

  const limit = Error.stackTraceLimit;

--- a/packages/babel-core/src/transformation/file/file.js
+++ b/packages/babel-core/src/transformation/file/file.js
@ -19,6 +19,17 @@ const errorVisitor = {
  },
 };

+export type NodeLocation = {
+  loc?: {
+    end?: { line: number, column: number },
+    start: { line: number, column: number },
+  },
+  _loc?: {
+    end?: { line: number, column: number },
+    start: { line: number, column: number },
+  },
+};
+
 export default class File {
  _map: Map<any, any> = new Map();
  opts: Object;
@ -250,17 +261,12 @@ export default class File {
  }

  buildCodeFrameError(
-    node: ?{
-      loc?: { start: { line: number, column: number } },
-      _loc?: { start: { line: number, column: number } },
-    },
+    node: ?NodeLocation,
    msg: string,
    Error: typeof Error = SyntaxError,
  ): Error {
    let loc = node && (node.loc || node._loc);

-    msg = `${this.opts.filename}: ${msg}`;
-
    if (!loc && node) {
      const state = {
        loc: null,
@ -287,6 +293,13 @@ export default class File {
              line: loc.start.line,
              column: loc.start.column + 1,
            },
+            end:
+              loc.end && loc.start.line === loc.end.line
+                ? {
+                    line: loc.end.line,
+                    column: loc.end.column + 1,
+                  }
+                : undefined,
          },
          { highlightCode },
        );
--- a/packages/babel-core/src/transformation/file/generate.js
+++ b/packages/babel-core/src/transformation/file/generate.js
@ -41,7 +41,7 @@ export default function generateCode(

    if (typeof result.then === "function") {
      throw new Error(
-        `You appear to be using an async parser plugin, ` +
+        `You appear to be using an async codegen plugin, ` +
          `which your current version of Babel does not support. ` +
          `If you're using a published plugin, ` +
          `you may need to upgrade your @babel/core version.`,
--- a/packages/babel-core/src/transformation/index.js
+++ b/packages/babel-core/src/transformation/index.js
@ -55,11 +55,29 @@ export function runSync(
    ast,
  );

-  transformFile(file, config.passes);
-
  const opts = file.opts;
-  const { outputCode, outputMap } =
-    opts.code !== false ? generateCode(config.passes, file) : {};
+  try {
+    transformFile(file, config.passes);
+  } catch (e) {
+    e.message = `${opts.filename ?? "unknown"}: ${e.message}`;
+    if (!e.code) {
+      e.code = "BABEL_TRANSFORM_ERROR";
+    }
+    throw e;
+  }
+
+  let outputCode, outputMap;
+  try {
+    if (opts.code !== false) {
+      ({ outputCode, outputMap } = generateCode(config.passes, file));
+    }
+  } catch (e) {
+    e.message = `${opts.filename ?? "unknown"}: ${e.message}`;
+    if (!e.code) {
+      e.code = "BABEL_GENERATE_ERROR";
+    }
+    throw e;
+  }

  return {
    metadata: file.metadata,
--- a/packages/babel-core/src/transformation/normalize-file.js
+++ b/packages/babel-core/src/transformation/normalize-file.js
@ -65,7 +65,8 @@ export default function normalizeFile(
      if (typeof options.filename === "string" && lastComment) {
        try {
          inputMap = convertSourceMap.fromMapFileComment(
-            lastComment,
+            // fromMapFileComment requires the whole comment block
+            `//${lastComment}`,
            path.dirname(options.filename),
          );
        } catch (err) {
@ -107,7 +108,7 @@ function parser(
    } else if (results.length === 1) {
      if (typeof results[0].then === "function") {
        throw new Error(
-          `You appear to be using an async codegen plugin, ` +
+          `You appear to be using an async parser plugin, ` +
            `which your current version of Babel does not support. ` +
            `If you're using a published plugin, you may need to upgrade ` +
            `your @babel/core version.`,
@ -121,6 +122,7 @@ function parser(
      err.message +=
        "\nConsider renaming the file to '.mjs', or setting sourceType:module " +
        "or sourceType:unambiguous in your Babel config for this file.";
+      // err.code will be changed to BABEL_PARSE_ERROR later.
    }

    const { loc, missingPlugin } = err;
@ -155,7 +157,7 @@ function parser(

 // eslint-disable-next-line max-len
 const INLINE_SOURCEMAP_REGEX = /^[@#]\s+sourceMappingURL=data:(?:application|text)\/json;(?:charset[:=]\S+?;)?base64,(?:.*)$/;
-const EXTERNAL_SOURCEMAP_REGEX = /^[@#][ \t]+sourceMappingURL=([^\s'"`]+?)[ \t]*$/;
+const EXTERNAL_SOURCEMAP_REGEX = /^[@#][ \t]+sourceMappingURL=(?:[^\s'"`]+?)[ \t]*$/;

 function extractCommentsFromList(regex, comments, lastComment) {
  if (comments) {
--- a/packages/babel-core/src/transformation/plugin-pass.js
+++ b/packages/babel-core/src/transformation/plugin-pass.js
@ -1,6 +1,7 @@
 // @flow

 import type File from "./file/file";
+import type NodeLocation from "./file/file";

 export default class PluginPass {
  _map: Map<mixed, mixed> = new Map();
@ -47,14 +48,7 @@ export default class PluginPass {
    return this.file.getModuleName();
  }

-  buildCodeFrameError(
-    node: ?{
-      loc?: { start: { line: number, column: number } },
-      _loc?: { start: { line: number, column: number } },
-    },
-    msg: string,
-    Error?: typeof Error,
-  ) {
+  buildCodeFrameError(node: ?NodeLocation, msg: string, Error?: typeof Error) {
    return this.file.buildCodeFrameError(node, msg, Error);
  }
 }
--- a/packages/babel-core/test/config-chain.js
+++ b/packages/babel-core/test/config-chain.js
@ -1,7 +1,44 @@
 import fs from "fs";
+import os from "os";
 import path from "path";
+import escapeRegExp from "lodash/escapeRegExp";
 import { loadOptions as loadOptionsOrig } from "../lib";

+// TODO: In Babel 8, we can directly uses fs.promises which is supported by
+// node 8+
+const pfs =
+  fs.promises ??
+  new Proxy(fs, {
+    get(target, name) {
+      if (name === "copyFile") {
+        // fs.copyFile is only supported since node 8.5
+        // https://stackoverflow.com/a/30405105/2359289
+        return function copyFile(source, target) {
+          const rd = fs.createReadStream(source);
+          const wr = fs.createWriteStream(target);
+          return new Promise(function(resolve, reject) {
+            rd.on("error", reject);
+            wr.on("error", reject);
+            wr.on("finish", resolve);
+            rd.pipe(wr);
+          }).catch(function(error) {
+            rd.destroy();
+            wr.end();
+            throw error;
+          });
+        };
+      }
+
+      return (...args) =>
+        new Promise((resolve, reject) =>
+          target[name](...args, (error, result) => {
+            if (error) reject(error);
+            else resolve(result);
+          }),
+        );
+    },
+  });
+
 function fixture(...args) {
  return path.join(__dirname, "fixtures", "config", ...args);
 }
@ -13,6 +50,24 @@ function loadOptions(opts) {
  });
 }

+function pairs(items) {
+  const pairs = [];
+  for (let i = 0; i < items.length - 1; i++) {
+    for (let j = i + 1; j < items.length; j++) {
+      pairs.push([items[i], items[j]]);
+    }
+  }
+  return pairs;
+}
+
+async function getTemp(name) {
+  const cwd = await pfs.mkdtemp(os.tmpdir() + path.sep + name);
+  const tmp = name => path.join(cwd, name);
+  const config = name =>
+    pfs.copyFile(fixture("config-files-templates", name), tmp(name));
+  return { cwd, tmp, config };
+}
+
 describe("buildConfigChain", function() {
  describe("test", () => {
    describe("single", () => {
@ -33,7 +88,7 @@ describe("buildConfigChain", function() {
          cwd: fixture("nonexistant-fake"),
          filename: fixture("nonexistant-fake", "src.js"),
          babelrc: false,
-          test: new RegExp(fixture("nonexistant-fake")),
+          test: new RegExp(escapeRegExp(fixture("nonexistant-fake"))),
          comments: true,
        });

@ -69,7 +124,7 @@ describe("buildConfigChain", function() {
          cwd: fixture("nonexistant-fake"),
          filename: fixture("nonexistant-fake", "src.js"),
          babelrc: false,
-          test: new RegExp(fixture("nonexistant-unknown")),
+          test: new RegExp(escapeRegExp(fixture("nonexistant-unknown"))),
          comments: true,
        });

@ -107,7 +162,7 @@ describe("buildConfigChain", function() {
          cwd: fixture("nonexistant-fake"),
          filename: fixture("nonexistant-fake", "src.js"),
          babelrc: false,
-          test: [new RegExp(fixture("nonexistant-fake"))],
+          test: [new RegExp(escapeRegExp(fixture("nonexistant-fake")))],
          comments: true,
        });

@ -143,7 +198,7 @@ describe("buildConfigChain", function() {
          cwd: fixture("nonexistant-fake"),
          filename: fixture("nonexistant-fake", "src.js"),
          babelrc: false,
-          test: [new RegExp(fixture("nonexistant-unknown"))],
+          test: [new RegExp(escapeRegExp(fixture("nonexistant-unknown")))],
          comments: true,
        });

@ -183,7 +238,7 @@ describe("buildConfigChain", function() {
          cwd: fixture("nonexistant-fake"),
          filename: fixture("nonexistant-fake", "src.js"),
          babelrc: false,
-          include: new RegExp(fixture("nonexistant-fake")),
+          include: new RegExp(escapeRegExp(fixture("nonexistant-fake"))),
          comments: true,
        });

@ -219,7 +274,7 @@ describe("buildConfigChain", function() {
          cwd: fixture("nonexistant-fake"),
          filename: fixture("nonexistant-fake", "src.js"),
          babelrc: false,
-          include: new RegExp(fixture("nonexistant-unknown")),
+          include: new RegExp(escapeRegExp(fixture("nonexistant-unknown"))),
          comments: true,
        });

@ -257,7 +312,7 @@ describe("buildConfigChain", function() {
          cwd: fixture("nonexistant-fake"),
          filename: fixture("nonexistant-fake", "src.js"),
          babelrc: false,
-          include: [new RegExp(fixture("nonexistant-fake"))],
+          include: [new RegExp(escapeRegExp(fixture("nonexistant-fake")))],
          comments: true,
        });

@ -293,7 +348,7 @@ describe("buildConfigChain", function() {
          cwd: fixture("nonexistant-fake"),
          filename: fixture("nonexistant-fake", "src.js"),
          babelrc: false,
-          include: [new RegExp(fixture("nonexistant-unknown"))],
+          include: [new RegExp(escapeRegExp(fixture("nonexistant-unknown")))],
          comments: true,
        });

@ -333,7 +388,7 @@ describe("buildConfigChain", function() {
          cwd: fixture("nonexistant-fake"),
          filename: fixture("nonexistant-fake", "src.js"),
          babelrc: false,
-          exclude: new RegExp(fixture("nonexistant-fake")),
+          exclude: new RegExp(escapeRegExp(fixture("nonexistant-fake"))),
          comments: true,
        });

@ -369,7 +424,7 @@ describe("buildConfigChain", function() {
          cwd: fixture("nonexistant-fake"),
          filename: fixture("nonexistant-fake", "src.js"),
          babelrc: false,
-          exclude: new RegExp(fixture("nonexistant-unknown")),
+          exclude: new RegExp(escapeRegExp(fixture("nonexistant-unknown"))),
          comments: true,
        });

@ -407,7 +462,7 @@ describe("buildConfigChain", function() {
          cwd: fixture("nonexistant-fake"),
          filename: fixture("nonexistant-fake", "src.js"),
          babelrc: false,
-          exclude: [new RegExp(fixture("nonexistant-fake"))],
+          exclude: [new RegExp(escapeRegExp(fixture("nonexistant-fake")))],
          comments: true,
        });

@ -443,7 +498,7 @@ describe("buildConfigChain", function() {
          cwd: fixture("nonexistant-fake"),
          filename: fixture("nonexistant-fake", "src.js"),
          babelrc: false,
-          exclude: [new RegExp(fixture("nonexistant-unknown"))],
+          exclude: [new RegExp(escapeRegExp(fixture("nonexistant-unknown")))],
          comments: true,
        });

@ -943,75 +998,93 @@ describe("buildConfigChain", function() {
      }
    });

-    it("should load .babelrc", () => {
-      const filename = fixture("config-files", "babelrc", "src.js");
+    describe("root", () => {
+      test.each(["babel.config.json", "babel.config.js", "babel.config.cjs"])(
+        "should load %s",
+        async name => {
+          const { cwd, tmp, config } = await getTemp(
+            `babel-test-load-config-${name}`,
+          );
+          const filename = tmp("src.js");
+
+          await config(name);

          expect(
            loadOptions({
              filename,
-          cwd: path.dirname(filename),
+              cwd,
            }),
          ).toEqual({
            ...getDefaults(),
-        filename: filename,
-        cwd: path.dirname(filename),
-        root: path.dirname(filename),
+            filename,
+            cwd,
+            root: cwd,
            comments: true,
          });
+        },
+      );
+
+      test.each(
+        pairs(["babel.config.json", "babel.config.js", "babel.config.cjs"]),
+      )("should throw if both %s and %s are used", async (name1, name2) => {
+        const { cwd, tmp, config } = await getTemp(
+          `babel-test-dup-config-${name1}-${name2}`,
+        );
+
+        await Promise.all([config(name1), config(name2)]);
+
+        expect(() => loadOptions({ filename: tmp("src.js"), cwd })).toThrow(
+          /Multiple configuration files found/,
+        );
+      });
    });

-    it("should load .babelrc.js", () => {
-      const filename = fixture("config-files", "babelrc-js", "src.js");
+    describe("relative", () => {
+      test.each(["package.json", ".babelrc", ".babelrc.js", ".babelrc.cjs"])(
+        "should load %s",
+        async name => {
+          const { cwd, tmp, config } = await getTemp(
+            `babel-test-load-config-${name}`,
+          );
+          const filename = tmp("src.js");

-      expect(loadOptions({ filename, cwd: path.dirname(filename) })).toEqual({
+          await config(name);
+
+          expect(
+            loadOptions({
+              filename,
+              cwd,
+            }),
+          ).toEqual({
            ...getDefaults(),
-        filename: filename,
-        cwd: path.dirname(filename),
-        root: path.dirname(filename),
+            filename,
+            cwd,
+            root: cwd,
            comments: true,
          });
-    });
-
-    it("should load package.json#babel", () => {
-      const filename = fixture("config-files", "pkg", "src.js");
-
-      expect(loadOptions({ filename, cwd: path.dirname(filename) })).toEqual({
-        ...getDefaults(),
-        filename: filename,
-        cwd: path.dirname(filename),
-        root: path.dirname(filename),
-        comments: true,
-      });
-    });
+        },
+      );

      it("should load .babelignore", () => {
        const filename = fixture("config-files", "babelignore", "src.js");

-      expect(loadOptions({ filename, cwd: path.dirname(filename) })).toBeNull();
+        expect(
+          loadOptions({ filename, cwd: path.dirname(filename) }),
+        ).toBeNull();
      });

-    it("should throw if there are both .babelrc and .babelrc.js", () => {
-      const filename = fixture("config-files", "both-babelrc", "src.js");
+      test.each(
+        pairs(["package.json", ".babelrc", ".babelrc.js", ".babelrc.cjs"]),
+      )("should throw if both %s and %s are used", async (name1, name2) => {
+        const { cwd, tmp, config } = await getTemp(
+          `babel-test-dup-config-${name1}-${name2}`,
+        );

-      expect(() =>
-        loadOptions({ filename, cwd: path.dirname(filename) }),
-      ).toThrow(/Multiple configuration files found/);
-    });
+        await Promise.all([config(name1), config(name2)]);

-    it("should throw if there are both .babelrc and package.json", () => {
-      const filename = fixture("config-files", "pkg-babelrc", "src.js");
-
-      expect(() =>
-        loadOptions({ filename, cwd: path.dirname(filename) }),
-      ).toThrow(/Multiple configuration files found/);
-    });
-
-    it("should throw if there are both .babelrc.js and package.json", () => {
-      const filename = fixture("config-files", "pkg-babelrc-js", "src.js");
-
-      expect(() =>
-        loadOptions({ filename, cwd: path.dirname(filename) }),
-      ).toThrow(/Multiple configuration files found/);
+        expect(() => loadOptions({ filename: tmp("src.js"), cwd })).toThrow(
+          /Multiple configuration files found/,
+        );
      });

      it("should ignore package.json without a 'babel' property", () => {
@ -1026,28 +1099,19 @@ describe("buildConfigChain", function() {
        });
      });

-    it("should show helpful errors for .babelrc", () => {
-      const filename = fixture("config-files", "babelrc-error", "src.js");
+      test.each`
+        config            | dir                    | error
+        ${".babelrc"}     | ${"babelrc-error"}     | ${/Error while parsing config - /}
+        ${".babelrc.js"}  | ${"babelrc-js-error"}  | ${/Babelrc threw an error/}
+        ${".babelrc.cjs"} | ${"babelrc-cjs-error"} | ${/Babelrc threw an error/}
+        ${"package.json"} | ${"pkg-error"}         | ${/Error while parsing JSON - /}
+      `("should show helpful errors for $config", ({ dir, error }) => {
+        const filename = fixture("config-files", dir, "src.js");

        expect(() =>
          loadOptions({ filename, cwd: path.dirname(filename) }),
-      ).toThrow(/Error while parsing config - /);
+        ).toThrow(error);
      });
-
-    it("should show helpful errors for .babelrc.js", () => {
-      const filename = fixture("config-files", "babelrc-js-error", "src.js");
-
-      expect(() =>
-        loadOptions({ filename, cwd: path.dirname(filename) }),
-      ).toThrow(/Babelrc threw an error/);
-    });
-
-    it("should show helpful errors for package.json", () => {
-      const filename = fixture("config-files", "pkg-error", "src.js");
-
-      expect(() =>
-        loadOptions({ filename, cwd: path.dirname(filename) }),
-      ).toThrow(/Error while parsing JSON - /);
    });

    it("should throw when `test` presents but `filename` is not passed", () => {
--- a/packages/babel-core/test/fixtures/config/config-files-templates/.babelrc
+++ b/packages/babel-core/test/fixtures/config/config-files-templates/.babelrc
@ -0,0 +1,3 @@
+{
+  "comments": true
+}
--- a/packages/babel-core/test/fixtures/config/config-files-templates/.babelrc.cjs
+++ b/packages/babel-core/test/fixtures/config/config-files-templates/.babelrc.cjs
@ -0,0 +1,3 @@
+module.exports = {
+  comments: true
+};
--- a/packages/babel-core/test/fixtures/config/config-files-templates/.babelrc.js
+++ b/packages/babel-core/test/fixtures/config/config-files-templates/.babelrc.js
@ -0,0 +1,3 @@
+module.exports = {
+  comments: true
+};
--- a/packages/babel-core/test/fixtures/config/config-files-templates/babel.config.cjs
+++ b/packages/babel-core/test/fixtures/config/config-files-templates/babel.config.cjs
@ -0,0 +1,3 @@
+module.exports = {
+  comments: true
+};
--- a/packages/babel-core/test/fixtures/config/config-files-templates/babel.config.js
+++ b/packages/babel-core/test/fixtures/config/config-files-templates/babel.config.js
@ -0,0 +1,3 @@
+module.exports = {
+  comments: true
+};
--- a/packages/babel-core/test/fixtures/config/config-files-templates/babel.config.json
+++ b/packages/babel-core/test/fixtures/config/config-files-templates/babel.config.json
@ -0,0 +1,3 @@
+{
+  "comments": true
+}
--- a/packages/babel-core/test/fixtures/config/config-files-templates/package.json
+++ b/packages/babel-core/test/fixtures/config/config-files-templates/package.json
--- a/packages/babel-core/test/fixtures/config/config-files/babelrc-cjs-error/.babelrc.cjs
+++ b/packages/babel-core/test/fixtures/config/config-files/babelrc-cjs-error/.babelrc.cjs
@ -0,0 +1,3 @@
+module.exports = function() {
+  throw new Error("Babelrc threw an error");
+};
--- a/packages/babel-core/test/fixtures/config/config-files/babelrc-js/.babelrc.js
+++ b/packages/babel-core/test/fixtures/config/config-files/babelrc-js/.babelrc.js
@ -1,3 +0,0 @@
-module.exports = {
-  comments: true,
-};
--- a/packages/babel-core/test/fixtures/config/config-files/babelrc/.babelrc
+++ b/packages/babel-core/test/fixtures/config/config-files/babelrc/.babelrc
@ -1,3 +0,0 @@
-{
-  comments: true,
-}
--- a/packages/babel-core/test/fixtures/config/config-files/both-babelrc/.babelrc
+++ b/packages/babel-core/test/fixtures/config/config-files/both-babelrc/.babelrc
@ -1 +0,0 @@
-{}
--- a/packages/babel-core/test/fixtures/config/config-files/both-babelrc/.babelrc.js
+++ b/packages/babel-core/test/fixtures/config/config-files/both-babelrc/.babelrc.js
@ -1 +0,0 @@
-module.exports = {};
--- a/packages/babel-core/test/fixtures/config/config-files/pkg-babelrc-js/.babelrc.js
+++ b/packages/babel-core/test/fixtures/config/config-files/pkg-babelrc-js/.babelrc.js
@ -1 +0,0 @@
-module.exports = {};
--- a/packages/babel-core/test/fixtures/config/config-files/pkg-babelrc-js/package.json
+++ b/packages/babel-core/test/fixtures/config/config-files/pkg-babelrc-js/package.json
@ -1,3 +0,0 @@
-{
-  "babel": {}
-}
--- a/packages/babel-core/test/fixtures/config/config-files/pkg-babelrc/.babelrc
+++ b/packages/babel-core/test/fixtures/config/config-files/pkg-babelrc/.babelrc
@ -1 +0,0 @@
-{}
--- a/packages/babel-core/test/fixtures/config/config-files/pkg-babelrc/package.json
+++ b/packages/babel-core/test/fixtures/config/config-files/pkg-babelrc/package.json
@ -1,3 +0,0 @@
-{
-  "babel": {}
-}
--- a/packages/babel-core/test/fixtures/parse/output.json
+++ b/packages/babel-core/test/fixtures/parse/output.json
@ -2,6 +2,7 @@
  "type": "File",
  "start": 0,
  "end": 91,
+  "errors": [],
  "loc": {
    "start": {
      "line": 1,
--- a/packages/babel-core/test/fixtures/plugins/build-code-frame-error/exec.js
+++ b/packages/babel-core/test/fixtures/plugins/build-code-frame-error/exec.js
@ -1,5 +1,6 @@
-var code = "function f() {}";
-transform(code, {
+expect(() => {
+  var code = "function f() {}";
+  transform(code, {
    plugins: [
      function() {
        return {
@ -13,4 +14,5 @@ transform(code, {
    ],
    // hard to assert on ANSI escape codes
    highlightCode: false,
-});
+  });
+}).toThrow(/^unknown: someMsg\s+> 1 \| function f\(\) {}/);
--- a/packages/babel-core/test/fixtures/plugins/build-code-frame-error/options.json
+++ b/packages/babel-core/test/fixtures/plugins/build-code-frame-error/options.json
@ -1,3 +0,0 @@
-{
-  "throws": "undefined: someMsg\n> 1 | function f() {}"
-}
--- a/packages/babel-core/test/fixtures/plugins/transform-error/exec.js
+++ b/packages/babel-core/test/fixtures/plugins/transform-error/exec.js
@ -0,0 +1,15 @@
+var code = "function f() {}";
+transform(code, {
+  plugins: [
+    function() {
+      return {
+        visitor: {
+          FunctionDeclaration: function(path) {
+            throw new Error("someMsg");
+          },
+        },
+      };
+    },
+  ],
+  filename: "/fake/path/example.js"
+});
--- a/packages/babel-core/test/fixtures/plugins/transform-error/options.json
+++ b/packages/babel-core/test/fixtures/plugins/transform-error/options.json
@ -0,0 +1,4 @@
+{
+  "throws": "/fake/path/example.js: someMsg",
+  "os": ["linux", "darwin"]
+}
--- a/packages/babel-core/test/fixtures/transformation/source-maps/input-source-map-external/input.js
+++ b/packages/babel-core/test/fixtures/transformation/source-maps/input-source-map-external/input.js
@ -0,0 +1,5 @@
+var foo = function () {
+  return 4;
+};
+
+//# sourceMappingURL=input.js.map
--- a/packages/babel-core/test/fixtures/transformation/source-maps/input-source-map-external/input.js.map
+++ b/packages/babel-core/test/fixtures/transformation/source-maps/input-source-map-external/input.js.map
@ -0,0 +1 @@
+{"version":3,"sources":["original.js"],"names":[],"mappings":"AAAA,UAAU,Y;SAAM,C;CAAC","sourcesContent":["var foo = () => 4;"]}
--- a/packages/babel-core/test/fixtures/transformation/source-maps/input-source-map-external/options.json
+++ b/packages/babel-core/test/fixtures/transformation/source-maps/input-source-map-external/options.json
@ -0,0 +1,3 @@
+{
+  "inputSourceMap": true
+}
--- a/packages/babel-core/test/fixtures/transformation/source-maps/input-source-map-external/output.js
+++ b/packages/babel-core/test/fixtures/transformation/source-maps/input-source-map-external/output.js
@ -0,0 +1,3 @@
+var foo = function () {
+  return 4;
+};
--- a/packages/babel-core/test/fixtures/transformation/source-maps/input-source-map-external/source-map.json
+++ b/packages/babel-core/test/fixtures/transformation/source-maps/input-source-map-external/source-map.json
@ -0,0 +1,7 @@
+{
+  "mappings": "AAAA,IAAA,GAAA,GAAU,Y;SAAM,C;AAAC,CAAjB",
+  "names": [],
+  "sources": ["original.js"],
+  "sourcesContent": ["var foo = () => 4;"],
+  "version": 3
+}
--- a/packages/babel-core/test/option-manager.js
+++ b/packages/babel-core/test/option-manager.js
@ -27,14 +27,19 @@ describe("option-manager", () => {
      return { plugin, calls };
    }

-    it("should throw if a plugin is repeated", () => {
-      const { calls, plugin } = makePlugin();
+    it("should throw if a plugin is repeated, with information about the repeated plugin", () => {
+      const { calls, plugin } = makePlugin("my-plugin");

      expect(() => {
        loadOptions({
-          plugins: [plugin, plugin],
+          plugins: [
+            [plugin, undefined, "my-plugin"],
+            [plugin, undefined, "my-plugin"],
+          ],
        });
-      }).toThrow(/Duplicate plugin\/preset detected/);
+      }).toThrow(
+        /Duplicate plugin\/preset detected.*Duplicates detected are.*my-plugin.*my-plugin/ms,
+      );
      expect(calls).toEqual([]);
    });

--- a/packages/babel-core/yarn.lock
+++ b/packages/babel-core/yarn.lock
--- a/packages/babel-generator/package.json
+++ b/packages/babel-generator/package.json
@ -1,6 +1,6 @@
 {
  "name": "@babel/generator",
-  "version": "7.6.2",
+  "version": "7.7.2",
  "description": "Turns an AST into code.",
  "author": "Sebastian McKenzie <sebmck@gmail.com>",
  "homepage": "https://babeljs.io/",
@ -14,13 +14,13 @@
    "lib"
  ],
  "dependencies": {
-    "@babel/types": "^7.6.0",
+    "@babel/types": "^7.7.2",
    "jsesc": "^2.5.1",
    "lodash": "^4.17.13",
    "source-map": "^0.5.0"
  },
  "devDependencies": {
-    "@babel/helper-fixtures": "^7.6.2",
-    "@babel/parser": "^7.6.2"
+    "@babel/helper-fixtures": "^7.6.3",
+    "@babel/parser": "^7.7.2"
  }
 }
--- a/packages/babel-generator/src/generators/classes.js
+++ b/packages/babel-generator/src/generators/classes.js
@ -71,26 +71,8 @@ export function ClassBody(node: Object) {

 export function ClassProperty(node: Object) {
  this.printJoin(node.decorators, node);
+  this.tsPrintClassMemberModifiers(node, /* isField */ true);

-  if (node.accessibility) {
-    // TS
-    this.word(node.accessibility);
-    this.space();
-  }
-  if (node.static) {
-    this.word("static");
-    this.space();
-  }
-  if (node.abstract) {
-    // TS
-    this.word("abstract");
-    this.space();
-  }
-  if (node.readonly) {
-    // TS
-    this.word("readonly");
-    this.space();
-  }
  if (node.computed) {
    this.token("[");
    this.print(node.key, node);
@ -148,23 +130,6 @@ export function ClassPrivateMethod(node: Object) {

 export function _classMethodHead(node) {
  this.printJoin(node.decorators, node);
-
-  if (node.accessibility) {
-    // TS
-    this.word(node.accessibility);
-    this.space();
-  }
-
-  if (node.abstract) {
-    // TS
-    this.word("abstract");
-    this.space();
-  }
-
-  if (node.static) {
-    this.word("static");
-    this.space();
-  }
-
+  this.tsPrintClassMemberModifiers(node, /* isField */ false);
  this._methodHead(node);
 }
--- a/packages/babel-generator/src/generators/flow.js
+++ b/packages/babel-generator/src/generators/flow.js
@ -134,6 +134,92 @@ export function DeclareExportAllDeclaration(/*node: Object*/) {
  ExportAllDeclaration.apply(this, arguments);
 }

+export function EnumDeclaration(node: Object) {
+  const { id, body } = node;
+  this.word("enum");
+  this.space();
+  this.print(id, node);
+  this.print(body, node);
+}
+
+function enumExplicitType(
+  context: Object,
+  name: string,
+  hasExplicitType: boolean,
+) {
+  if (hasExplicitType) {
+    context.space();
+    context.word("of");
+    context.space();
+    context.word(name);
+  }
+  context.space();
+}
+
+function enumBody(context: Object, node: Object) {
+  const { members } = node;
+  context.token("{");
+  context.indent();
+  context.newline();
+  for (const member of members) {
+    context.print(member, node);
+    context.newline();
+  }
+  context.dedent();
+  context.token("}");
+}
+
+export function EnumBooleanBody(node: Object) {
+  const { explicitType } = node;
+  enumExplicitType(this, "boolean", explicitType);
+  enumBody(this, node);
+}
+
+export function EnumNumberBody(node: Object) {
+  const { explicitType } = node;
+  enumExplicitType(this, "number", explicitType);
+  enumBody(this, node);
+}
+
+export function EnumStringBody(node: Object) {
+  const { explicitType } = node;
+  enumExplicitType(this, "string", explicitType);
+  enumBody(this, node);
+}
+
+export function EnumSymbolBody(node: Object) {
+  enumExplicitType(this, "symbol", true);
+  enumBody(this, node);
+}
+
+export function EnumDefaultedMember(node: Object) {
+  const { id } = node;
+  this.print(id, node);
+  this.token(",");
+}
+
+function enumInitializedMember(context: Object, node: Object) {
+  const { id, init } = node;
+  context.print(id, node);
+  context.space();
+  context.token("=");
+  context.space();
+  context.print(init, node);
+  context.token(",");
+}
+
+export function EnumBooleanMember(node: Object) {
+  enumInitializedMember(this, node);
+}
+
+export function EnumNumberMember(node: Object) {
+  enumInitializedMember(this, node);
+}
+
+export function EnumStringMember(node: Object) {
+  enumInitializedMember(this, node);
+}
+
 function FlowExportDeclaration(node: Object) {
  if (node.declaration) {
    const declar = node.declaration;
--- a/packages/babel-generator/src/generators/typescript.js
+++ b/packages/babel-generator/src/generators/typescript.js
@ -197,11 +197,17 @@ export function TSTypeReference(node) {
 }

 export function TSTypePredicate(node) {
+  if (node.asserts) {
+    this.word("asserts");
+    this.space();
+  }
  this.print(node.parameterName);
+  if (node.typeAnnotation) {
    this.space();
    this.word("is");
    this.space();
    this.print(node.typeAnnotation.typeAnnotation);
+  }
 }

 export function TSTypeQuery(node) {
@ -550,3 +556,26 @@ export function tsPrintSignatureDeclarationBase(node) {
  this.token(")");
  this.print(node.typeAnnotation, node);
 }
+
+export function tsPrintClassMemberModifiers(node, isField) {
+  if (isField && node.declare) {
+    this.word("declare");
+    this.space();
+  }
+  if (node.accessibility) {
+    this.word(node.accessibility);
+    this.space();
+  }
+  if (node.static) {
+    this.word("static");
+    this.space();
+  }
+  if (node.abstract) {
+    this.word("abstract");
+    this.space();
+  }
+  if (isField && node.readonly) {
+    this.word("readonly");
+    this.space();
+  }
+}
--- a/packages/babel-generator/src/node/parentheses.js
+++ b/packages/babel-generator/src/node/parentheses.js
@ -35,14 +35,22 @@ export function NullableTypeAnnotation(node: Object, parent: Object): boolean {
  return t.isArrayTypeAnnotation(parent);
 }

-export function FunctionTypeAnnotation(node: Object, parent: Object): boolean {
+export function FunctionTypeAnnotation(
+  node: Object,
+  parent: Object,
+  printStack: Array<Object>,
+): boolean {
  return (
    // (() => A) | (() => B)
    t.isUnionTypeAnnotation(parent) ||
    // (() => A) & (() => B)
    t.isIntersectionTypeAnnotation(parent) ||
    // (() => A)[]
-    t.isArrayTypeAnnotation(parent)
+    t.isArrayTypeAnnotation(parent) ||
+    // <T>(A: T): (T => T[]) => B => [A, B]
+    (t.isTypeAnnotation(parent) &&
+      // Check grandparent
+      t.isArrowFunctionExpression(printStack[printStack.length - 3]))
  );
 }

--- a/packages/babel-generator/src/source-map.js
+++ b/packages/babel-generator/src/source-map.js
@ -24,14 +24,20 @@ export default class SourceMap {

      const code = this._code;
      if (typeof code === "string") {
-        map.setSourceContent(this._opts.sourceFileName, code);
+        map.setSourceContent(
+          this._opts.sourceFileName.replace(/\\/g, "/"),
+          code,
+        );
      } else if (typeof code === "object") {
        Object.keys(code).forEach(sourceFileName => {
-          map.setSourceContent(sourceFileName, code[sourceFileName]);
+          map.setSourceContent(
+            sourceFileName.replace(/\\/g, "/"),
+            code[sourceFileName],
+          );
        });
      }

-      this._rawMappings.forEach(map.addMapping, map);
+      this._rawMappings.forEach(mapping => map.addMapping(mapping), map);
    }

    return this._cachedMap.toJSON();
@ -83,7 +89,10 @@ export default class SourceMap {
        line: generatedLine,
        column: generatedColumn,
      },
-      source: line == null ? undefined : filename || this._opts.sourceFileName,
+      source:
+        line == null
+          ? undefined
+          : (filename || this._opts.sourceFileName).replace(/\\/g, "/"),
      original:
        line == null
          ? undefined
--- a/packages/babel-generator/test/fixtures/flow/arrow-functions/input.js
+++ b/packages/babel-generator/test/fixtures/flow/arrow-functions/input.js
@ -5,3 +5,4 @@ const bar4 = x => {};
 const bar5 = (x): string => {};
 const bar6 = (x: number) => {};
 const bar7 = <T>(x) => {};
+const bar8 = <T>(x: T): (T => T[]) => y => [x, y];
--- a/packages/babel-generator/test/fixtures/flow/arrow-functions/output.js
+++ b/packages/babel-generator/test/fixtures/flow/arrow-functions/output.js
@ -11,3 +11,5 @@ const bar5 = (x): string => {};
 const bar6 = (x: number) => {};

 const bar7 = <T>(x) => {};
+
+const bar8 = <T>(x: T): ((T) => T[]) => y => [x, y];
--- a/packages/babel-generator/test/fixtures/flow/declare-statements/input.js
+++ b/packages/babel-generator/test/fixtures/flow/declare-statements/input.js
@ -11,13 +11,13 @@ declare class A { static [ indexer: number]: string }
 declare class A { static () : number }
 declare class B { (): number }
 declare class A mixins B<T>, C {}
-declare type A = string
+declare type A1 = string
 declare type T<U> = { [k:string]: U }
-declare type B = {
+declare type B1 = {
  fn?: (foo: string) => void,
 }
-declare interface I { foo: string }
-declare interface I<T> { foo: T }
+declare interface I1 { foo: string }
+declare interface I2<T> { foo: T }
 declare module.exports: { foo: string }
 declare opaque type Foo<T>: Bar<T>;
 declare opaque type ID;
--- a/packages/babel-generator/test/fixtures/flow/declare-statements/output.js
+++ b/packages/babel-generator/test/fixtures/flow/declare-statements/output.js
@ -22,17 +22,17 @@ declare class B {
  (): number
 }
 declare class A mixins B<T>, C {}
-declare type A = string;
+declare type A1 = string;
 declare type T<U> = {
  [k: string]: U
 };
-declare type B = {
+declare type B1 = {
  fn?: (foo: string) => void
 };
-declare interface I {
+declare interface I1 {
  foo: string
 }
-declare interface I<T> {
+declare interface I2<T> {
  foo: T
 }
 declare module.exports: {
--- a/packages/babel-generator/test/fixtures/flow/def-site-variance/input.js
+++ b/packages/babel-generator/test/fixtures/flow/def-site-variance/input.js
@ -5,10 +5,10 @@ type T2 = { +p: T };
 type T3 = { -p: T };
 type T4 = { +[k:K]: V };
 type T5 = { -[k:K]: V };
-interface I { +p: T }
-interface I { -p: T }
-interface I { +[k:K]: V }
-interface I { -[k:K]: V }
+interface I1 { +p: T }
+interface I2 { -p: T }
+interface I3 { +[k:K]: V }
+interface I4 { -[k:K]: V }
 declare class I { +p: T }
 declare class I { -p: T }
 declare class I { +[k:K]: V }
--- a/packages/babel-generator/test/fixtures/flow/def-site-variance/output.js
+++ b/packages/babel-generator/test/fixtures/flow/def-site-variance/output.js
@ -15,16 +15,16 @@ type T4 = {
 type T5 = {
  -[k: K]: V
 };
-interface I {
+interface I1 {
  +p: T
 }
-interface I {
+interface I2 {
  -p: T
 }
-interface I {
+interface I3 {
  +[k: K]: V
 }
-interface I {
+interface I4 {
  -[k: K]: V
 }
 declare class I {
--- a/packages/babel-generator/test/fixtures/flow/enum-declaration/input.js
+++ b/packages/babel-generator/test/fixtures/flow/enum-declaration/input.js
@ -0,0 +1,36 @@
+enum E {
+  A = true,
+  B = false,
+}
+enum E of boolean {
+  A = true,
+  B = false,
+}
+enum E {
+  A = 1,
+  B = 2,
+}
+enum E of number {
+  A = 1,
+  B = 2,
+}
+enum E {
+  A,
+  B,
+}
+enum E of string {
+  A,
+  B,
+}
+enum E {
+  A = "a",
+  B = "b",
+}
+enum E of string {
+  A = "a",
+  B = "b",
+}
+enum E of symbol {
+  A,
+  B,
+}
--- a/packages/babel-generator/test/fixtures/flow/enum-declaration/options.json
+++ b/packages/babel-generator/test/fixtures/flow/enum-declaration/options.json
@ -0,0 +1,3 @@
+{
+  "plugins": [["flow", { "enums": true }]]
+}
--- a/packages/babel-generator/test/fixtures/flow/enum-declaration/output.js
+++ b/packages/babel-generator/test/fixtures/flow/enum-declaration/output.js
@ -0,0 +1,36 @@
+enum E {
+  A = true,
+  B = false,
+}
+enum E of boolean {
+  A = true,
+  B = false,
+}
+enum E {
+  A = 1,
+  B = 2,
+}
+enum E of number {
+  A = 1,
+  B = 2,
+}
+enum E {
+  A,
+  B,
+}
+enum E of string {
+  A,
+  B,
+}
+enum E {
+  A = "a",
+  B = "b",
+}
+enum E of string {
+  A = "a",
+  B = "b",
+}
+enum E of symbol {
+  A,
+  B,
+}
--- a/packages/babel-generator/test/fixtures/flow/internal-slot/input.js
+++ b/packages/babel-generator/test/fixtures/flow/internal-slot/input.js
@ -1,7 +1,7 @@
 declare class C { static [[foo]]: T }
 declare class C { [[foo]]: T }
-interface I { [[foo]]: X }
-interface I { [[foo]](): X }
+interface I1 { [[foo]]: X }
+interface I2 { [[foo]](): X }
 type T1 = { [[foo]]: X }
 type T2 = { [[foo]](): X }
 type T3 = { [[foo]]?: X }
--- a/packages/babel-generator/test/fixtures/flow/internal-slot/output.js
+++ b/packages/babel-generator/test/fixtures/flow/internal-slot/output.js
@ -4,10 +4,10 @@ declare class C {
 declare class C {
  [[foo]]: T
 }
-interface I {
+interface I1 {
  [[foo]]: X
 }
-interface I {
+interface I2 {
  [[foo]]() => X
 }
 type T1 = {
--- a/packages/babel-generator/test/fixtures/flow/iterator-inside-interface/input.js
+++ b/packages/babel-generator/test/fixtures/flow/iterator-inside-interface/input.js
@ -1,7 +1,7 @@
-interface A {
+interface A1 {
  @@iterator(): Iterator<File>;
 }

-interface A {
+interface A2 {
  @@asyncIterator(): Iterator<File>;
 }
--- a/packages/babel-generator/test/fixtures/flow/iterator-inside-interface/output.js
+++ b/packages/babel-generator/test/fixtures/flow/iterator-inside-interface/output.js
@ -1,6 +1,6 @@
-interface A {
+interface A1 {
  @@iterator(): Iterator<File>
 }
-interface A {
+interface A2 {
  @@asyncIterator(): Iterator<File>
 }
--- a/packages/babel-generator/test/fixtures/typescript/arrow-function-assertion/input.js
+++ b/packages/babel-generator/test/fixtures/typescript/arrow-function-assertion/input.js
@ -0,0 +1,2 @@
+(x: any): asserts x => true;
+(x: any): asserts x is boolean => true;
--- a/packages/babel-generator/test/fixtures/typescript/arrow-function-assertion/output.js
+++ b/packages/babel-generator/test/fixtures/typescript/arrow-function-assertion/output.js
@ -0,0 +1,3 @@
+(x: any): asserts x => true;
+
+(x: any): asserts x is boolean => true;
--- a/packages/babel-generator/test/fixtures/typescript/class-field-declare/input.js
+++ b/packages/babel-generator/test/fixtures/typescript/class-field-declare/input.js
@ -0,0 +1,5 @@
+class A {
+  declare foo;
+  declare bar: string;
+  declare readonly bax: number;
+}
--- a/packages/babel-generator/test/fixtures/typescript/class-field-declare/options.json
+++ b/packages/babel-generator/test/fixtures/typescript/class-field-declare/options.json
@ -0,0 +1,4 @@
+{
+  "sourceType": "module",
+  "plugins": ["typescript", "classProperties"]
+}
--- a/packages/babel-generator/test/fixtures/typescript/class-field-declare/output.js
+++ b/packages/babel-generator/test/fixtures/typescript/class-field-declare/output.js
@ -0,0 +1,5 @@
+class A {
+  declare foo;
+  declare bar: string;
+  declare readonly bax: number;
+}
--- a/packages/babel-generator/test/fixtures/typescript/function-assertion/input.js
+++ b/packages/babel-generator/test/fixtures/typescript/function-assertion/input.js
@ -0,0 +1,2 @@
+function f(x: any): asserts x {}
+(function(x: any): asserts x is boolean {})
--- a/packages/babel-generator/test/fixtures/typescript/function-assertion/output.js
+++ b/packages/babel-generator/test/fixtures/typescript/function-assertion/output.js
@ -0,0 +1,3 @@
+function f(x: any): asserts x {}
+
+(function (x: any): asserts x is boolean {});
--- a/packages/babel-generator/test/index.js
+++ b/packages/babel-generator/test/index.js
@ -197,7 +197,7 @@ describe("generation", function() {

    const id2 = fn.body.body[0].expression;
    id2.name += "2";
-    id2.loc.identiferName = "bar";
+    id2.loc.identifierName = "bar";

    const generated = generate(
      ast,
--- a/packages/babel-helper-annotate-as-pure/package.json
+++ b/packages/babel-helper-annotate-as-pure/package.json
@ -1,6 +1,6 @@
 {
  "name": "@babel/helper-annotate-as-pure",
-  "version": "7.0.0",
+  "version": "7.7.0",
  "description": "Helper function to annotate paths and nodes with #__PURE__ comment",
  "repository": "https://github.com/babel/babel/tree/master/packages/babel-helper-annotate-as-pure",
  "license": "MIT",
@ -9,6 +9,6 @@
  },
  "main": "lib/index.js",
  "dependencies": {
-    "@babel/types": "^7.0.0"
+    "@babel/types": "^7.7.0"
  }
 }
--- a/packages/babel-helper-bindify-decorators/package.json
+++ b/packages/babel-helper-bindify-decorators/package.json
@ -1,6 +1,6 @@
 {
  "name": "@babel/helper-bindify-decorators",
-  "version": "7.1.0",
+  "version": "7.7.0",
  "description": "Helper function to bindify decorators",
  "repository": "https://github.com/babel/babel/tree/master/packages/babel-helper-bindify-decorators",
  "license": "MIT",
@ -9,7 +9,7 @@
  },
  "main": "lib/index.js",
  "dependencies": {
-    "@babel/traverse": "^7.1.0",
-    "@babel/types": "^7.0.0"
+    "@babel/traverse": "^7.7.0",
+    "@babel/types": "^7.7.0"
  }
 }
--- a/packages/babel-helper-builder-binary-assignment-operator-visitor/package.json
+++ b/packages/babel-helper-builder-binary-assignment-operator-visitor/package.json
@ -1,6 +1,6 @@
 {
  "name": "@babel/helper-builder-binary-assignment-operator-visitor",
-  "version": "7.1.0",
+  "version": "7.7.0",
  "description": "Helper function to build binary assignment operator visitors",
  "repository": "https://github.com/babel/babel/tree/master/packages/babel-helper-builder-binary-assignment-operator-visitor",
  "license": "MIT",
@ -9,7 +9,7 @@
  },
  "main": "lib/index.js",
  "dependencies": {
-    "@babel/helper-explode-assignable-expression": "^7.1.0",
-    "@babel/types": "^7.0.0"
+    "@babel/helper-explode-assignable-expression": "^7.7.0",
+    "@babel/types": "^7.7.0"
  }
 }
--- a/packages/babel-helper-builder-react-jsx/package.json
+++ b/packages/babel-helper-builder-react-jsx/package.json
@ -1,6 +1,6 @@
 {
  "name": "@babel/helper-builder-react-jsx",
-  "version": "7.3.0",
+  "version": "7.7.0",
  "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": "^7.3.0",
+    "@babel/types": "^7.7.0",
    "esutils": "^2.0.0"
  }
 }
--- a/packages/babel-helper-builder-react-jsx/src/index.js
+++ b/packages/babel-helper-builder-react-jsx/src/index.js
@ -87,13 +87,15 @@ You can turn on the 'throwIfNamespace' flag to bypass this warning.`,
  function convertAttribute(node) {
    const value = convertAttributeValue(node.value || t.booleanLiteral(true));

+    if (t.isJSXSpreadAttribute(node)) {
+      return t.spreadElement(node.argument);
+    }
+
    if (t.isStringLiteral(value) && !t.isJSXExpressionContainer(node.value)) {
      value.value = value.value.replace(/\n\s+/g, " ");

      // "raw" JSXText should not be used from a StringLiteral because it needs to be escaped.
-      if (value.extra && value.extra.raw) {
-        delete value.extra.raw;
-      }
+      delete value.extra?.raw;
    }

    if (t.isJSXNamespacedName(node.name)) {
@ -172,6 +174,14 @@ You can turn on the 'throwIfNamespace' flag to bypass this warning.`,
    let _props = [];
    const objs = [];

+    const { useSpread = false } = file.opts;
+    if (typeof useSpread !== "boolean") {
+      throw new Error(
+        "transform-react-jsx currently only accepts a boolean option for " +
+          "useSpread (defaults to false)",
+      );
+    }
+
    const useBuiltIns = file.opts.useBuiltIns || false;
    if (typeof useBuiltIns !== "boolean") {
      throw new Error(
@ -180,6 +190,18 @@ You can turn on the 'throwIfNamespace' flag to bypass this warning.`,
      );
    }

+    if (useSpread && useBuiltIns) {
+      throw new Error(
+        "transform-react-jsx currently only accepts useBuiltIns or useSpread " +
+          "but not both",
+      );
+    }
+
+    if (useSpread) {
+      const props = attribs.map(convertAttribute);
+      return t.objectExpression(props);
+    }
+
    while (attribs.length) {
      const prop = attribs.shift();
      if (t.isJSXSpreadAttribute(prop)) {
--- a/packages/babel-helper-call-delegate/package.json
+++ b/packages/babel-helper-call-delegate/package.json
@ -1,6 +1,6 @@
 {
  "name": "@babel/helper-call-delegate",
-  "version": "7.4.4",
+  "version": "7.7.0",
  "description": "Helper function to call delegate",
  "repository": "https://github.com/babel/babel/tree/master/packages/babel-helper-call-delegate",
  "license": "MIT",
@ -9,8 +9,8 @@
  },
  "main": "lib/index.js",
  "dependencies": {
-    "@babel/helper-hoist-variables": "^7.4.4",
-    "@babel/traverse": "^7.4.4",
-    "@babel/types": "^7.4.4"
+    "@babel/helper-hoist-variables": "^7.7.0",
+    "@babel/traverse": "^7.7.0",
+    "@babel/types": "^7.7.0"
  }
 }
--- a/packages/babel-helper-create-class-features-plugin/package.json
+++ b/packages/babel-helper-create-class-features-plugin/package.json
@ -1,6 +1,6 @@
 {
  "name": "@babel/helper-create-class-features-plugin",
-  "version": "7.6.0",
+  "version": "7.7.0",
  "author": "The Babel Team (https://babeljs.io/team)",
  "license": "MIT",
  "description": "Compile class public and private fields, private methods and decorators to ES6",
@ -14,18 +14,19 @@
    "babel-plugin"
  ],
  "dependencies": {
-    "@babel/helper-function-name": "^7.1.0",
-    "@babel/helper-member-expression-to-functions": "^7.5.5",
-    "@babel/helper-optimise-call-expression": "^7.0.0",
+    "@babel/helper-function-name": "^7.7.0",
+    "@babel/helper-member-expression-to-functions": "^7.7.0",
+    "@babel/helper-optimise-call-expression": "^7.7.0",
    "@babel/helper-plugin-utils": "^7.0.0",
-    "@babel/helper-replace-supers": "^7.5.5",
-    "@babel/helper-split-export-declaration": "^7.4.4"
+    "@babel/helper-replace-supers": "^7.7.0",
+    "@babel/helper-split-export-declaration": "^7.7.0",
+    "semver": "^5.5.0"
  },
  "peerDependencies": {
-    "@babel/core": "^7.0.0"
+    "@babel/core": "^7.0.0 || csx"
  },
  "devDependencies": {
-    "@babel/core": "^7.6.0",
+    "@babel/core": "^7.7.0",
    "@babel/helper-plugin-test-runner": "^7.0.0"
  }
 }
--- a/packages/babel-helper-create-class-features-plugin/src/fields.js
+++ b/packages/babel-helper-create-class-features-plugin/src/fields.js
@ -5,6 +5,8 @@ import ReplaceSupers, {
 import memberExpressionToFunctions from "@babel/helper-member-expression-to-functions";
 import optimiseCall from "@babel/helper-optimise-call-expression";

+import * as ts from "./typescript";
+
 export function buildPrivateNamesMap(props) {
  const privateNamesMap = new Map();
  for (const prop of props) {
@ -556,6 +558,8 @@ export function buildFieldsInitNodes(
  let needsClassRef = false;

  for (const prop of props) {
+    ts.assertFieldTransformed(prop);
+
    const isStatic = prop.node.static;
    const isInstance = !isStatic;
    const isPrivate = prop.isPrivate();
--- a/Show More
+++ b/Show More
				`@ -0,0 +1 @@`
				`SyntaxError: <CWD>\test.js: Unexpected token, expected ";" (2:10)`
				`@ -0,0 +1 @@`
				`{"version":3,"sources":["original.js"],"names":[],"mappings":"AAAA,UAAU,Y;SAAM,C;CAAC","sourcesContent":["var foo = () => 4;"]}`