v7.0.0-beta.41

It is also exported as type

.babelrc.js

@@ -1,63 +1,48 @@
 "use strict";
 
-// Blame Logan for this.
-// This works around https://github.com/istanbuljs/istanbuljs/issues/92 until
-// we have a version of Istanbul that actually works with 7.x.
-function istanbulHacks() {
-  return {
-    inherits: require("babel-plugin-istanbul").default,
-    visitor: {
-      Program: {
-        exit: function(path) {
-          if (!this.__dv__) return
-
-          const node = path.node.body[0];
-          if (
-            node.type !== "VariableDeclaration" ||
-            node.declarations[0].id.type !== "Identifier" ||
-            !node.declarations[0].id.name.match(/cov_/) ||
-            node._blockHoist !== 3
-          ) {
-            throw new Error("Something has gone wrong in Logan's hacks.");
-          }
-
-          // Gross hacks to put the code coverage block above all compiled
-          // import statement output.
-          node._blockHoist = 5;
-        },
-      },
-    },
-  };
-}
-
-let envOpts = {
+const env = process.env.BABEL_ENV || process.env.NODE_ENV;
+const envOpts = {
   loose: true,
 };
 
+switch (env) {
+  case "development":
+    envOpts.debug = true;
+  // fall-through
+  case "test":
+  case "cov":
+    envOpts.targets = {
+      node: "current",
+    };
+}
+
 const config = {
   comments: false,
-  presets: [
-    ["@babel/env", envOpts],
-    "@babel/flow"
-  ],
+  presets: [["@babel/env", envOpts]],
   plugins: [
+    // TODO: Use @babel/preset-flow when
+    // https://github.com/babel/babel/issues/7233 is fixed
+    "@babel/plugin-transform-flow-strip-types",
     ["@babel/proposal-class-properties", { loose: true }],
     "@babel/proposal-export-namespace-from",
     "@babel/proposal-numeric-separator",
     ["@babel/proposal-object-rest-spread", { useBuiltIns: true }],
-  ]
+  ],
+  overrides: [
+    {
+      test: "packages/babylon",
+      plugins: [
+        "babel-plugin-transform-charcodes",
+        ["@babel/transform-for-of", { assumeArray: true }],
+      ],
+    },
+  ],
 };
 
-if (process.env.BABEL_ENV === "cov") {
+// we need to do this as long as we do not test everything from source
+if (env === "cov") {
   config.auxiliaryCommentBefore = "istanbul ignore next";
-  config.plugins.push(istanbulHacks);
-}
-
-if (process.env.BABEL_ENV === "development") {
-  envOpts.targets = {
-    node: "current"
-  };
-  envOpts.debug = true;
+  config.plugins.push("babel-plugin-istanbul");
 }
 
 module.exports = config;

.babelrc.rollup.js

@@ -0,0 +1,16 @@
+"use strict";
+
+const cloneDeep = require("lodash/cloneDeep");
+const babelrc = require("./.babelrc.js");
+
+const config = cloneDeep(babelrc);
+
+const presetEnv = config.presets.find(preset => preset[0] === "@babel/env");
+
+if (!presetEnv) {
+  throw new Error("Error while extracting @preset/env from .babelrc.js");
+}
+
+presetEnv[1].modules = false;
+
+module.exports = config;

.circleci/config.yml

@@ -0,0 +1,61 @@
+version: 2
+aliases:
+  - &restore-node-modules-cache
+    keys:
+      - v1-yarn-deps-{{ checksum "yarn.lock" }}
+
+  - &restore-yarn-cache
+    keys:
+      - v1-yarn-cache
+
+  - &save-node-modules-cache
+    paths:
+      - node_modules
+    key: v1-yarn-deps-{{ checksum "yarn.lock" }}
+
+  - &save-yarn-cache
+    paths:
+      - ~/.yarn-cache
+    key: v1-yarn-cache
+
+  - &yarn-install
+    run: |
+      sudo npm i -g yarn@^1.5.1
+      yarn --version
+
+  - &artifact_babel
+    path: ~/babel/packages/babel-standalone/babel.js
+
+  - &artifact_babel_min
+    path: ~/babel/packages/babel-standalone/babel.min.js
+
+  - &artifact_env
+    path: ~/babel/packages/babel-preset-env-standalone/babel-preset-env.js
+
+  - &artifact_env_min
+    path: ~/babel/packages/babel-preset-env-standalone/babel-preset-env.min.js
+
+jobs:
+  build:
+    working_directory: ~/babel
+    docker:
+      - image: circleci/node:9
+    steps:
+      - checkout
+      - restore-cache: *restore-yarn-cache
+      - restore-cache: *restore-node-modules-cache
+      - *yarn-install
+      - run: make test-ci-coverage
+      # Builds babel-standalone with the regular Babel config
+      - run: make build
+      # test-ci-coverage doesn't test babel-standalone, as trying to gather coverage
+      # data for a JS file that's several megabytes large is bound to fail. Here,
+      # we just run the babel-standalone test separately.
+      - run: ./node_modules/.bin/jest packages/babel-standalone/test/
+      - run: ./node_modules/.bin/jest packages/babel-preset-env-standalone/test/
+      - store_artifacts: *artifact_babel
+      - store_artifacts: *artifact_babel_min
+      - store_artifacts: *artifact_env
+      - store_artifacts: *artifact_env_min
+      - save_cache: *save-node-modules-cache
+      - save_cache: *save-yarn-cache

.eslintignore

@@ -1,4 +1,6 @@
 /lib
+/build
+package.json
 packages/babel-runtime
 !packages/babel-runtime/scripts
 !packages/babel-runtime/core-js.js
@@ -18,5 +20,4 @@ packages/babel-preset-env-standalone/babel-preset-env.js
 packages/babel-preset-env-standalone/babel-preset-env.min.js
 packages/babel-standalone/babel.js
 packages/babel-standalone/babel.min.js
-packages/babylon/build
 packages/babylon/test/expressions

.eslintrc.json

@@ -1,8 +1,7 @@
 {
+  "root": true,
   "extends": "babel",
-  "plugins": [
-    "prettier"
-  ],
+  "plugins": ["prettier"],
   "rules": {
     "curly": ["error", "multi-line"],
     "prettier/prettier": "error",
@@ -13,12 +12,10 @@
   },
   "overrides": [
     {
-      "files": [
-        "packages/*/src/**/*.js",
-        "codemods/*/src/**/*.js"
-      ],
+      "files": ["packages/*/src/**/*.js", "codemods/*/src/**/*.js"],
       "rules": {
-        "no-undefined-identifier": "error"
+        "no-undefined-identifier": "error",
+        "no-deprecated-clone": "error"
       }
     },
     {
@@ -28,7 +25,7 @@
         "test/**/*.js"
       ],
       "env": {
-        "mocha": true
+        "jest": true
       }
     }
   ]

.flowconfig

@@ -13,8 +13,8 @@ codemods/*/src
 [libs]
 lib/file.js
 lib/parser.js
-lib/types.js
 lib/third-party-libs.js.flow
+packages/babel-types/lib/index.js.flow
 
 [options]
 include_warnings=true

.gitignore

@@ -16,15 +16,19 @@ package-lock.json
 !/packages/babel-runtime/core-js/map.js
 /packages/babel-runtime/helpers/*.js
 !/packages/babel-runtime/helpers/toArray.js
+!/packages/babel-runtime/helpers/iterableToArray.js
 !/packages/babel-runtime/helpers/temporalRef.js
 /packages/babel-runtime/helpers/builtin/*.js
 !/packages/babel-runtime/helpers/builtin/toArray.js
+!/packages/babel-runtime/helpers/builtin/iterableToArray.js
 !/packages/babel-runtime/helpers/builtin/temporalRef.js
 /packages/babel-runtime/helpers/builtin/es6/*.js
 !/packages/babel-runtime/helpers/builtin/es6/toArray.js
+!/packages/babel-runtime/helpers/builtin/es6/iterableToArray.js
 !/packages/babel-runtime/helpers/builtin/es6/temporalRef.js
 /packages/babel-runtime/helpers/es6/*.js
 !/packages/babel-runtime/helpers/es6/toArray.js
+!/packages/babel-runtime/helpers/es6/iterableToArray.js
 !/packages/babel-runtime/helpers/es6/temporalRef.js
 /packages/babel-register/test/.babel
 /packages/babel-cli/test/tmp

.prettierignore

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

.prettierrc

@@ -1,5 +1,14 @@
 {
+  "arrowParens": "avoid",
   "trailingComma": "es5",
+  "useTabs": false,
+  "semi": true,
+  "singleQuote": false,
+  "bracketSpacing": true,
+  "jsxBracketSameLine": false,
+  "tabWidth": 2,
+  "parser": "babylon",
+  "printWidth": 80,
   "overrides": [{
     "files": [
       "**/codemods/*/src/**/*.js",

.travis.yml

@@ -7,6 +7,7 @@ cache:
   directories:
   - node_modules
 node_js:
+  # We test the latest version on circleci
   - '8'
   - '6'
   - '4'
@@ -19,6 +20,8 @@ env:
 before_install:
   - curl -o- -L https://yarnpkg.com/install.sh | bash
 
+install: yarn --ignore-engines
+
 before_script:
   - 'if [ "$JOB" = "babylon-flow-tests" ]; then make bootstrap-flow; fi'
   - 'if [ "$JOB" = "babylon-test262-tests" ]; then make bootstrap-test262; fi'

CONTRIBUTING.md

@@ -116,7 +116,7 @@ $ TEST_ONLY=babel-cli make test
 
 ```sh
 # Run tests for the @babel/plugin-transform-classes package.
-$ TEST_ONLY=es2015-class make test
+$ TEST_ONLY=babel-plugin-transform-classes make test
 ```
 
 Use the `TEST_GREP` variable to run a subset of tests by name:
@@ -175,21 +175,21 @@ For example, in [`@babel/plugin-transform-exponentiation-operator/test`](https:/
 
 - In each subfolder, you can organize your directory structure by categories of tests. (Example: these folders can be named after the feature you are testing or can reference the issue number they fix)
 - Generally, there are two kinds of tests for plugins
-   - The first is a simple test of the input and output produced by running Babel on some code. We do this by creating an [`actual.js`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/binary/actual.js) file and an [`expected.js`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/binary/expected.js) file.
-   - If you need to expect an error, you can ignore creating the `expected.js` file and pass a new `throws` key to the `options.json` that contains the error string that is created.
+   - The first is a simple test of the input and output produced by running Babel on some code. We do this by creating an [`input.js`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/binary/input.js) file and an [`output.js`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/binary/output.js) file. This kind of test only works in sub-subdirectories of `/fixtures`, i.e. `/fixtures/exponentian-operator/binary/input.js` and **not** `/fixtures/exponentian-operator/input.js`.
+   - If you need to expect an error, you can ignore creating the `output.js` file and pass a new `throws` key to the `options.json` that contains the error string that is created.
    - The second and preferred type is a test that actually evaluates the produced code and asserts that certain properties are true or false. We do this by creating an [`exec.js`](https://github.com/babel/babel/blob/master/packages/babel-plugin-transform-exponentiation-operator/test/fixtures/exponentian-operator/comprehensive/exec.js) file.
 
-In an actual/expected test, you simply write out the code you want transformed in `actual.js`.
+In a fixture test, you simply write out the code you want transformed in `input.js`.
 
 ```js
-// actual.js
+// input.js
 2 ** 2;
 ```
 
-and the expected output after transforming it with your `options.json` in `expected.js`.
+and the expected output after transforming it with your `options.json` in `output.js`.
 
 ```js
-// expected.js
+// output.js
 Math.pow(2, 2);
 ```
 In an `exec.js` test, we run or check that the code actually does what it's supposed to do rather than just check the static output.
@@ -227,14 +227,14 @@ Inside the `packages/babylon/tests/fixtures` folder are categories/groupings of
 etc.). To add a test, create a folder under one of these groupings (or create a new one) with a
 descriptive name, and add the following:
 
-* Create an `actual.js` file that contains the code you want Babylon to parse.
+* Create an `input.js` file that contains the code you want Babylon to parse.
 
-* Add an `expected.json` file with the expected parser output. For added convenience, if there is no `expected.json` present, the test runner will generate one for you.
+* Add an `output.json` file with the expected parser output. For added convenience, if there is no `output.json` present, the test runner will generate one for you.
 
 After writing tests for babylon, just build it by running:
 
 ```sh
-$ make build-babylon
+$ make build
 ```
 
 Then, to run the tests, use:
@@ -245,7 +245,7 @@ $ TEST_ONLY=babylon make test-only
 
 #### Bootstrapping expected output
 
-For both `@babel/plugin-x` and `babylon`, you can easily generate an `expected.js`/`expected.json` automatically by just providing `actual.js` and running the tests as you usually would.
+For both `@babel/plugin-x` and `babylon`, you can easily generate an `output.js`/`output.json` automatically by just providing `input.js` and running the tests as you usually would.
 
 ```
 // Example
@@ -256,8 +256,8 @@ For both `@babel/plugin-x` and `babylon`, you can easily generate an `expected.j
         - comments
           - basic
             - block-trailing-comment
-              - actual.js
-              - expected.json (will be generated if not created)
+              - input.js
+              - output.json (will be generated if not created)
 ```
 
 ### Debugging code

Gulpfile.js

@@ -12,6 +12,11 @@ const gulp = require("gulp");
 const path = require("path");
 const webpack = require("webpack");
 const merge = require("merge-stream");
+const rollup = require("rollup-stream");
+const source = require("vinyl-source-stream");
+const buffer = require("vinyl-buffer");
+const rollupBabel = require("rollup-plugin-babel");
+const rollupNodeResolve = require("rollup-plugin-node-resolve");
 const registerStandalonePackageTask = require("./scripts/gulp-tasks")
   .registerStandalonePackageTask;
 
@@ -27,53 +32,100 @@ function getGlobFromSource(source) {
   return `./${source}/*/src/**/*.js`;
 }
 
-gulp.task("default", ["build"]);
+function getIndexFromPackage(name) {
+  return `${name}/src/index.js`;
+}
 
-gulp.task("build", function() {
+function compilationLogger(rollup) {
+  return through.obj(function(file, enc, callback) {
+    gutil.log(
+      `Compiling '${chalk.cyan(file.relative)}'${
+        rollup ? " with rollup " : ""
+      }...`
+    );
+    callback(null, file);
+  });
+}
+
+function errorsLogger() {
+  return plumber({
+    errorHandler(err) {
+      gutil.log(err.stack);
+    },
+  });
+}
+
+function rename(fn) {
+  return through.obj(function(file, enc, callback) {
+    file.path = fn(file);
+    callback(null, file);
+  });
+}
+
+function buildBabel(exclude) {
   return merge(
     sources.map(source => {
       const base = path.join(__dirname, source);
-      const f = filter(["**", "!**/packages/babylon/**"]);
 
-      return gulp
-        .src(getGlobFromSource(source), { base: base })
-        .pipe(f)
-        .pipe(
-          plumber({
-            errorHandler: function(err) {
-              gutil.log(err.stack);
-            },
-          })
-        )
-        .pipe(
-          newer({
-            dest: base,
-            map: swapSrcWithLib,
-          })
-        )
-        .pipe(
-          through.obj(function(file, enc, callback) {
-            gutil.log("Compiling", "'" + chalk.cyan(file.relative) + "'...");
-            callback(null, file);
-          })
-        )
+      let stream = gulp.src(getGlobFromSource(source), { base: base });
+
+      if (exclude) {
+        const filters = exclude.map(p => `!**/${p}/**`);
+        filters.unshift("**");
+        stream = stream.pipe(filter(filters));
+      }
+
+      return stream
+        .pipe(errorsLogger())
+        .pipe(newer({ dest: base, map: swapSrcWithLib }))
+        .pipe(compilationLogger())
         .pipe(babel())
         .pipe(
-          through.obj(function(file, enc, callback) {
-            // Passing 'file.relative' because newer() above uses a relative
-            // path and this keeps it consistent.
-            file.path = path.resolve(file.base, swapSrcWithLib(file.relative));
-            callback(null, file);
-          })
+          // Passing 'file.relative' because newer() above uses a relative
+          // path and this keeps it consistent.
+          rename(file => path.resolve(file.base, swapSrcWithLib(file.relative)))
         )
         .pipe(gulp.dest(base));
     })
   );
+}
+
+function buildRollup(packages) {
+  return merge(
+    packages.map(pkg => {
+      return rollup({
+        input: getIndexFromPackage(pkg),
+        format: "cjs",
+        plugins: [
+          rollupBabel({
+            babelrc: false,
+            extends: "./.babelrc.rollup.js",
+          }),
+          rollupNodeResolve(),
+        ],
+      })
+        .pipe(source("index.js"))
+        .pipe(buffer())
+        .pipe(errorsLogger())
+        .pipe(compilationLogger(/* rollup */ true))
+        .pipe(gulp.dest(path.join(pkg, "lib")));
+    })
+  );
+}
+
+gulp.task("default", ["build"]);
+
+gulp.task("build", function() {
+  const bundles = ["packages/babylon"];
+
+  return merge([buildBabel(/* exclude */ bundles), buildRollup(bundles)]);
 });
 
-gulp.task("watch", ["build"], function() {
+gulp.task("build-no-bundle", () => buildBabel());
+
+gulp.task("watch", ["build-no-bundle"], function() {
   watch(sources.map(getGlobFromSource), { debounceDelay: 200 }, function() {
-    gulp.start("build");
+    gulp.start("build-no-bundle");
   });
 });
 

Makefile

@@ -1,6 +1,6 @@
 MAKEFLAGS = -j1
 FLOW_COMMIT = 622bbc4f07acb77eb1109830c70815f827401d90
-TEST262_COMMIT = 1282e842febf418ca27df13fa4b32f7e5021b470
+TEST262_COMMIT = 52f70e2f637731aae92a9c9a2d831310c3ab2e1e
 
 export NODE_ENV = test
 
@@ -13,21 +13,20 @@ SOURCES = packages codemods
 
 build: clean
 	make clean-lib
-  # Build babylon before building all other projects
-	make build-babylon
 	./node_modules/.bin/gulp build
 	node ./packages/babel-types/scripts/generateTypeHelpers.js
 	# call build again as the generated files might need to be compiled again.
 	./node_modules/.bin/gulp build
+	# generate flow and typescript typings
+	node scripts/generators/flow.js > ./packages/babel-types/lib/index.js.flow
+	node scripts/generators/typescript.js > ./packages/babel-types/lib/index.d.ts
+	# generate docs
+	node scripts/generators/docs.js > ./packages/babel-types/README.md
 ifneq ("$(BABEL_ENV)", "cov")
 	make build-standalone
 	make build-preset-env-standalone
 endif
 
-build-babylon:
-	cd packages/babylon; \
-	./node_modules/.bin/rollup -c
-
 build-standalone:
 	./node_modules/.bin/gulp build-babel-standalone
 
@@ -39,24 +38,27 @@ build-dist: build
 	scripts/build-dist.sh
 	cd packages/babel-runtime; \
 	node scripts/build-dist.js
-	node scripts/generate-babel-types-docs.js
 
 watch: clean
 	make clean-lib
-	BABEL_ENV=development ./node_modules/.bin/gulp watch
 
-watch-babylon:
-	cd packages/babylon; \
-	./node_modules/.bin/rollup -c -w
+	# Ensure that build artifacts for types are created during local
+	# development too.
+	BABEL_ENV=development ./node_modules/.bin/gulp build-no-bundle
+	node ./packages/babel-types/scripts/generateTypeHelpers.js
+	node scripts/generators/flow.js > ./packages/babel-types/lib/index.js.flow
+	BABEL_ENV=development ./node_modules/.bin/gulp watch
 
 flow:
 	./node_modules/.bin/flow check --strip-root
 
 lint:
-	./node_modules/.bin/eslint scripts $(SOURCES) *.js --format=codeframe --rulesdir="./scripts/eslint_rules"
+	./node_modules/.bin/eslint scripts $(SOURCES) '*.js' '**/.*.js' --format=codeframe --rulesdir="./scripts/eslint_rules"
 
 fix:
-	./node_modules/.bin/eslint scripts $(SOURCES) *.js --format=codeframe --fix --rulesdir="./scripts/eslint_rules"
+	# The config is hardcoded because otherwise prettier searches for it and also picks up some broken package.json files from tests
+	./node_modules/.bin/prettier --config .prettierrc --write --ignore-path .eslintignore '**/*.json'
+	./node_modules/.bin/eslint scripts $(SOURCES) '*.js' '**/.*.js' --format=codeframe --fix --rulesdir="./scripts/eslint_rules"
 
 clean: test-clean
 	rm -rf packages/babel-polyfill/browser*
@@ -81,7 +83,7 @@ test-ci:
 test-ci-coverage: SHELL:=/bin/bash
 test-ci-coverage:
 	BABEL_ENV=cov make bootstrap
-	./scripts/test-cov.sh
+	TEST_TYPE=cov ./scripts/test-cov.sh
 	bash <(curl -s https://codecov.io/bash) -f coverage/coverage-final.json
 
 bootstrap-flow:
@@ -130,8 +132,8 @@ publish:
 
 bootstrap:
 	make clean-all
-	yarn
-	./node_modules/.bin/lerna bootstrap
+	yarn --ignore-engines
+	./node_modules/.bin/lerna bootstrap -- --ignore-engines
 	make build
 	cd packages/babel-runtime; \
 	node scripts/build-dist.js

circle.yml

@@ -1,30 +0,0 @@
-general:
-  artifacts:
-    - "packages/babel-standalone/babel.js"
-    - "packages/babel-standalone/babel.min.js"
-    - "packages/babel-preset-env-standalone/babel-preset-env.js"
-    - "packages/babel-preset-env-standalone/babel-preset-env.min.js"
-
-machine:
-  node:
-    version:
-      8
-
-dependencies:
-  pre:
-    - curl -o- -L https://yarnpkg.com/install.sh | bash
-  cache_directories:
-    - ~/.yarn-cache
-  override:
-    - yarn
-
-test:
-  override:
-    - make test-ci-coverage
-    # Builds babel-standalone with the regular Babel config
-    - make build
-    # test-ci-coverage doesn't test babel-standalone, as trying to gather coverage
-    # data for a JS file that's several megabytes large is bound to fail. Here,
-    # we just run the babel-standalone test separately.
-    - ./node_modules/mocha/bin/_mocha packages/babel-standalone/test/ --opts test/mocha.opts
-    - ./node_modules/mocha/bin/_mocha packages/babel-preset-env-standalone/test/ --opts test/mocha.opts

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

@@ -1,6 +1,6 @@
 {
   "name": "@babel/plugin-codemod-optional-catch-binding",
-  "version": "7.0.0-beta.37",
+  "version": "7.0.0-beta.41",
   "description": "Remove unused catch bindings",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-remove-unused-catch-binding",
   "license": "MIT",
@@ -9,13 +9,13 @@
     "@babel/plugin"
   ],
   "dependencies": {
-    "@babel/plugin-syntax-optional-catch-binding": "7.0.0-beta.37"
+    "@babel/plugin-syntax-optional-catch-binding": "7.0.0-beta.41"
   },
   "peerDependencies": {
-    "@babel/core": "7.0.0-beta.37"
+    "@babel/core": "7.0.0-beta.41"
   },
   "devDependencies": {
-    "@babel/core": "7.0.0-beta.37",
-    "@babel/helper-plugin-test-runner": "7.0.0-beta.37"
+    "@babel/core": "7.0.0-beta.41",
+    "@babel/helper-plugin-test-runner": "7.0.0-beta.41"
   }
 }

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 ran together which finds bugs that touch multiple modules easier.
+ * Tests across modules are run together which finds bugs that touch multiple modules easier.
 
 **Cons:**
 

lerna.json

@@ -1,16 +1,16 @@
 {
   "lerna": "2.0.0-rc.4",
-  "version": "7.0.0-beta.37",
+  "version": "7.0.0-beta.41",
   "changelog": {
     "repo": "babel/babel",
     "labels": {
-      "PR: Spec Compliancy": ":eyeglasses: Spec Compliancy",
-      "PR: Breaking Change": ":boom: Breaking Change",
-      "PR: New Feature": ":rocket: New Feature",
-      "PR: Bug Fix": ":bug: Bug Fix",
-      "PR: Polish": ":nail_care: Polish",
-      "PR: Docs": ":memo: Documentation",
-      "PR: Internal": ":house: Internal"
+      "PR: Spec Compliancy :eyeglasses:": ":eyeglasses: Spec Compliancy",
+      "PR: Breaking Change :boom:": ":boom: Breaking Change",
+      "PR: New Feature :rocket:": ":rocket: New Feature",
+      "PR: Bug Fix :bug:": ":bug: Bug Fix",
+      "PR: Polish :nail_care:": ":nail_care: Polish",
+      "PR: Docs :memo:": ":memo: Documentation",
+      "PR: Internal :house:": ":house: Internal"
     }
   },
   "cacheDir": ".changelog",

lib/third-party-libs.js.flow

@@ -3,9 +3,9 @@
  */
 
 declare module "micromatch" {
-  declare function exports(Array<string>, Array<string>, ?{
-    nocase: boolean,
-  }): Array<string>;
+  declare module.exports: {
+    (Array<string>, Array<string>, ?{ nocase: boolean }): Array<string>,
+  };
 }
 
 declare module "resolve" {

package.json

@@ -10,32 +10,34 @@
     "test": "make test"
   },
   "devDependencies": {
-    "@babel/cli": "7.0.0-beta.33",
-    "@babel/core": "7.0.0-beta.33",
-    "@babel/plugin-proposal-export-namespace-from": "7.0.0-beta.33",
-    "@babel/preset-env": "7.0.0-beta.33",
-    "@babel/preset-flow": "7.0.0-beta.33",
-    "@babel/preset-stage-0": "7.0.0-beta.33",
-    "@babel/register": "7.0.0-beta.33",
-    "async": "^1.5.0",
+    "@babel/cli": "7.0.0-beta.40",
+    "@babel/core": "7.0.0-beta.40",
+    "@babel/preset-env": "7.0.0-beta.40",
+    "@babel/preset-flow": "7.0.0-beta.40",
+    "@babel/preset-stage-0": "7.0.0-beta.40",
+    "@babel/register": "7.0.0-beta.40",
+    "babel-core": "^7.0.0-0",
     "babel-eslint": "^8.0.1",
+    "babel-jest": "^22.4.1",
     "babel-loader": "8.0.0-beta.0",
-    "babel-plugin-istanbul": "^4.1.4",
-    "babylon": "7.0.0-beta.33",
+    "babel-plugin-transform-charcodes": "^0.1.0",
+    "babylon": "7.0.0-beta.40",
     "browserify": "^13.1.1",
     "bundle-collapser": "^1.2.1",
     "chai": "^4.1.0",
-    "chalk": "^2.0.0",
+    "chalk": "^2.3.2",
+    "charcodes": "^0.1.0",
     "derequire": "^2.0.2",
-    "eslint": "^4.5.0",
+    "enhanced-resolve": "^3.0.0",
+    "eslint": "^4.18.2",
     "eslint-config-babel": "^7.0.2",
     "eslint-plugin-flowtype": "^2.20.0",
-    "eslint-plugin-prettier": "^2.2.0",
-    "flow-bin": "^0.59.0",
+    "eslint-plugin-prettier": "^2.5.0",
+    "flow-bin": "^0.66.0",
     "graceful-fs": "^4.1.11",
     "gulp": "^3.9.0",
     "gulp-babel": "^8.0.0-beta.0",
-    "gulp-filter": "^5.0.1",
+    "gulp-filter": "^5.1.0",
     "gulp-newer": "^1.0.0",
     "gulp-plumber": "^1.0.1",
     "gulp-rename": "^1.2.2",
@@ -43,21 +45,24 @@
     "gulp-util": "^3.0.7",
     "gulp-watch": "^4.3.5",
     "husky": "^0.14.3",
+    "jest": "^22.4.2",
     "lerna": "2.0.0",
     "lerna-changelog": "^0.5.0",
-    "lint-staged": "^4.2.3",
+    "lint-staged": "^6.0.1",
     "lodash": "^4.2.0",
     "merge-stream": "^1.0.1",
-    "mocha": "^3.0.0",
-    "nyc": "^11.0.3",
     "output-file-sync": "^2.0.0",
-    "prettier": "1.9.1",
+    "prettier": "1.11.1",
     "pump": "^1.0.2",
     "rimraf": "^2.4.3",
-    "semver": "^5.0.0",
+    "rollup-plugin-babel": "^4.0.0-beta.0",
+    "rollup-plugin-node-resolve": "^3.0.2",
+    "rollup-stream": "^1.24.1",
+    "test262-stream": "^1.1.0",
     "through2": "^2.0.0",
     "uglify-js": "^2.4.16",
-    "util.promisify": "^1.0.0",
+    "vinyl-buffer": "^1.0.1",
+    "vinyl-source-stream": "^2.0.0",
     "webpack": "^3.4.1",
     "webpack-dependency-suite": "^2.4.4",
     "webpack-stream": "^4.0.0"
@@ -67,20 +72,45 @@
     "npm": ">= 2.x <= 5.x",
     "yarn": ">=0.27.5 || >=1.0.0-20170811"
   },
-  "nyc": {
-    "all": true,
-    "exclude": [
-      "scripts/*.js",
-      "packages/*/test/**",
-      "packages/babel-standalone/**",
-      "codemods/*/test/**"
-    ],
-    "sourceMap": false,
-    "instrument": false
-  },
   "lint-staged": {
     "*.js": [
       "eslint --format=codeframe --rulesdir='./scripts/eslint_rules'"
     ]
+  },
+  "jest": {
+    "collectCoverageFrom": [
+      "packages/*/src/**/*.mjs",
+      "packages/*/src/**/*.js",
+      "codemods/*/src/**/*.mjs",
+      "codemods/*/src/**/*.js"
+    ],
+    "testRegex": "./(packages|codemods)/[^/]+/test/.+\\.m?js$",
+    "testPathIgnorePatterns": [
+      "/node_modules/",
+      "/test/fixtures/",
+      "/test/debug-fixtures/",
+      "/babylon/test/expressions/",
+      "/test/tmp/",
+      "/test/__data__/",
+      "/test/helpers/",
+      "<rootDir>/test/warning\\.js",
+      "<rootDir>/build/",
+      "_browser\\.js"
+    ],
+    "testEnvironment": "node",
+    "setupTestFrameworkScriptFile": "<rootDir>/test/testSetupFile.js",
+    "transformIgnorePatterns": [
+      "/node_modules/",
+      "<rootDir>/packages/babel-standalone/babel(\\.min)?\\.js",
+      "<rootDir>/packages/babel-preset-env-standalone/babel-preset-env(\\.min)?\\.js",
+      "/test/(fixtures|tmp|__data__)/",
+      "<rootDir>/(packages|codemods)/[^/]+/lib/"
+    ],
+    "modulePathIgnorePatterns": [
+      "/test/fixtures/",
+      "/test/tmp/",
+      "/test/__data__/",
+      "<rootDir>/build/"
+    ]
   }
 }

packages/README.md

@@ -13,15 +13,15 @@ A monorepo, muhahahahahaha. See the [monorepo design doc](/doc/design/monorepo.m
 
 | Package | Version | Dependencies |
 |--------|-------|------------|
-| [`@babel/core`](/packages/babel-core) | [![npm](https://img.shields.io/npm/v/babel-core.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-core) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-core)](https://david-dm.org/babel/babel?path=packages/babel-core) |
-| [`babylon`](https://github.com/babel/babel/tree/master/packages/babylon) | [![npm](https://img.shields.io/npm/v/babylon.svg?maxAge=2592000)](https://www.npmjs.com/package/babylon) | [![Dependency Status](https://david-dm.org/babel/babylon.svg)](https://david-dm.org/babel/babylon) |
-| [`@babel/traverse`](/packages/babel-traverse) | [![npm](https://img.shields.io/npm/v/babel-traverse.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-traverse) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-traverse)](https://david-dm.org/babel/babel?path=packages/babel-traverse) |
-| [`@babel/generator`](/packages/babel-generator) | [![npm](https://img.shields.io/npm/v/babel-generator.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-generator) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-generator)](https://david-dm.org/babel/babel?path=packages/babel-generator) |
+| [`@babel/core`](/packages/babel-core) | [![npm](https://img.shields.io/npm/v/@babel/core.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/core) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-core)](https://david-dm.org/babel/babel?path=packages/babel-core) |
+| [`babylon`](/packages/babylon) | [![npm](https://img.shields.io/npm/v/babylon.svg?maxAge=2592000)](https://www.npmjs.com/package/babylon) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babylon)](https://david-dm.org/babel/babel?path=packages/babylon) |
+| [`@babel/traverse`](/packages/babel-traverse) | [![npm](https://img.shields.io/npm/v/@babel/traverse.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/traverse) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-traverse)](https://david-dm.org/babel/babel?path=packages/babel-traverse) |
+| [`@babel/generator`](/packages/babel-generator) | [![npm](https://img.shields.io/npm/v/@babel/generator.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/generator) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-generator)](https://david-dm.org/babel/babel?path=packages/babel-generator) |
 
 [`@babel/core`](/packages/babel-core) is the Babel compiler itself; it exposes the `babel.transform` method, where `transformedCode = transform(src).code`.
 
 The compiler can be broken down into 3 parts:
-- The parser: [`babylon`](https://github.com/babel/babel/tree/master/packages/babylon)
+- The parser: [`babylon`](/packages/babylon)
 - The transformer[s]: All the plugins/presets
   - These all use [`@babel/traverse`](/packages/babel-traverse) to traverse through the AST
 - The generator: [`@babel/generator`](/packages/babel-generator)
@@ -36,18 +36,18 @@ Check out the [`babel-handbook`](https://github.com/thejameskyle/babel-handbook/
 
 | Package | Version | Dependencies |
 |--------|-------|------------|
-| [`@babel/cli`](/packages/babel-cli) | [![npm](https://img.shields.io/npm/v/babel-cli.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-cli) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-cli)](https://david-dm.org/babel/babel?path=packages/babel-cli) |
-| [`@babel/types`](/packages/babel-types) | [![npm](https://img.shields.io/npm/v/babel-types.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-types) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-types)](https://david-dm.org/babel/babel?path=packages/babel-types) |
-| [`@babel/polyfill`](/packages/babel-polyfill) | [![npm](https://img.shields.io/npm/v/babel-polyfill.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-polyfill) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-polyfill)](https://david-dm.org/babel/babel?path=packages/babel-polyfill) |
-| [`@babel/runtime`](/packages/babel-runtime) | [![npm](https://img.shields.io/npm/v/babel-runtime.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-runtime) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-runtime)](https://david-dm.org/babel/babel?path=packages/babel-runtime) |
-| [`@babel/register`](/packages/babel-register) | [![npm](https://img.shields.io/npm/v/babel-register.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-register) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-register)](https://david-dm.org/babel/babel?path=packages/babel-register) |
-| [`@babel/template`](/packages/babel-template) | [![npm](https://img.shields.io/npm/v/babel-template.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-template) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-template)](https://david-dm.org/babel/babel?path=packages/babel-template) |
-| [`@babel/helpers`](/packages/babel-helpers) | [![npm](https://img.shields.io/npm/v/babel-helpers.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-helpers) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-helpers)](https://david-dm.org/babel/babel?path=packages/babel-helpers) |
-| [`@babel/code-frame`](/packages/babel-code-frame) | [![npm](https://img.shields.io/npm/v/babel-code-frame.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-code-frame) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-code-frame)](https://david-dm.org/babel/babel?path=packages/babel-code-frame) |
+| [`@babel/cli`](/packages/babel-cli) | [![npm](https://img.shields.io/npm/v/@babel/cli.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/cli) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-cli)](https://david-dm.org/babel/babel?path=packages/babel-cli) |
+| [`@babel/types`](/packages/babel-types) | [![npm](https://img.shields.io/npm/v/@babel/types.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/types) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-types)](https://david-dm.org/babel/babel?path=packages/babel-types) |
+| [`@babel/polyfill`](/packages/babel-polyfill) | [![npm](https://img.shields.io/npm/v/@babel/polyfill.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/polyfill) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-polyfill)](https://david-dm.org/babel/babel?path=packages/babel-polyfill) |
+| [`@babel/runtime`](/packages/babel-runtime) | [![npm](https://img.shields.io/npm/v/@babel/runtime.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/runtime) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-runtime)](https://david-dm.org/babel/babel?path=packages/babel-runtime) |
+| [`@babel/register`](/packages/babel-register) | [![npm](https://img.shields.io/npm/v/@babel/register.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/register) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-register)](https://david-dm.org/babel/babel?path=packages/babel-register) |
+| [`@babel/template`](/packages/babel-template) | [![npm](https://img.shields.io/npm/v/@babel/template.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/template) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-template)](https://david-dm.org/babel/babel?path=packages/babel-template) |
+| [`@babel/helpers`](/packages/babel-helpers) | [![npm](https://img.shields.io/npm/v/@babel/helpers.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/helpers) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-helpers)](https://david-dm.org/babel/babel?path=packages/babel-helpers) |
+| [`@babel/code-frame`](/packages/babel-code-frame) | [![npm](https://img.shields.io/npm/v/@babel/code-frame.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/code-frame) | [![Dependency Status](https://david-dm.org/babel/babel.svg?path=packages/babel-code-frame)](https://david-dm.org/babel/babel?path=packages/babel-code-frame) |
 
 - [`@babel/cli`](/packages/babel-cli) is the CLI tool that runs `@babel/core` and helps with outputting to a directory, a file, stdout and more (also includes `@babel/node` cli). Check out the [docs](https://babeljs.io/docs/usage/cli/).
 - [`@babel/types`](/packages/babel-types) is used to validate, build and change AST nodes.
-- [`@babel/polyfill`](/packages/babel-polyfill) is [literally a wrapper](https://github.com/babel/babel/blob/master/packages/babel-polyfill/src/index.js) around [`core-js`](https://github.com/zloirock/core-js) and [regenerator-runtime](https://github.com/facebook/regenerator/tree/master/packages/regenerator-runtime). Check out the [docs](https://babeljs.io/docs/usage/polyfill/).
+- [`@babel/polyfill`](/packages/babel-polyfill) is [literally a wrapper](/packages/babel-polyfill/src/index.js) around [`core-js`](https://github.com/zloirock/core-js) and [regenerator-runtime](https://github.com/facebook/regenerator/tree/master/packages/regenerator-runtime). Check out the [docs](https://babeljs.io/docs/usage/polyfill/).
 - [`@babel/runtime`](/packages/babel-runtime) is similar to the polyfill except that it doesn't modify the global scope and is to be used with [`@babel/plugin-transform-runtime`](/packages/babel-plugin-transform-runtime) (usually in library/plugin code). Check out the [docs](https://babeljs.io/docs/plugins/transform-runtime/).
 - [`@babel/register`](/packages/babel-register) is a way to automatically compile files with Babel on the fly by binding to Node.js `require`. Check out the [docs](http://babeljs.io/docs/usage/require/).
 - [`@babel/template`](/packages/babel-template) is a helper function that allows constructing AST nodes from a string presentation of the code; this eliminates the tedium of using `@babel/types` for building AST nodes.
@@ -62,7 +62,7 @@ The transformer[s] used in Babel are the independent pieces of code that transfo
 
 | Package | Version | Dependencies | Description |
 |--------|-------|------------|---|
-| [`@babel/preset-env`](https://github.com/babel/babel-preset-env) | [![npm](https://img.shields.io/npm/v/babel-preset-env.svg?maxAge=2592000)](https://www.npmjs.com/package/babel-preset-env) | [![Dependency Status](https://david-dm.org/babel/babel-preset-env.svg)](https://david-dm.org/babel/babel-preset-env) | automatically determines plugins and polyfills you need based on your supported environments |
+| [`@babel/preset-env`](/packages/babel-preset-env) | [![npm](https://img.shields.io/npm/v/@babel/preset-env.svg?maxAge=2592000)](https://www.npmjs.com/package/@babel/preset-env) | [![Dependency Status](https://david-dm.org/babel/babel/status.svg?path=packages/babel-preset-env)](https://david-dm.org/babel/babel?path=packages/babel-preset-env) | automatically determines plugins and polyfills you need based on your supported environments |
 
 > You can find community maintained presets on [npm](https://www.npmjs.com/search?q=babel-preset)
 

packages/babel-cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@babel/cli",
-  "version": "7.0.0-beta.37",
+  "version": "7.0.0-beta.41",
   "description": "Babel command line.",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://babeljs.io/",
@@ -29,11 +29,11 @@
     "chokidar": "^1.6.1"
   },
   "peerDependencies": {
-    "@babel/core": "7.0.0-beta.37"
+    "@babel/core": "7.0.0-beta.41"
   },
   "devDependencies": {
-    "@babel/core": "7.0.0-beta.37",
-    "@babel/helper-fixtures": "7.0.0-beta.37"
+    "@babel/core": "7.0.0-beta.41",
+    "@babel/helper-fixtures": "7.0.0-beta.41"
   },
   "bin": {
     "babel": "./bin/babel.js",

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

@@ -6,10 +6,16 @@ import fs from "fs";
 
 import * as util from "./util";
 
+let compiledFiles = 0;
+
 export default function(commander, filenames, opts) {
-  function write(src, relative, base) {
+  function write(src, relative, base, callback) {
+    if (typeof base === "function") {
+      callback = base;
+      base = undefined;
+    }
     if (!util.isCompilableExtension(relative, commander.extensions)) {
-      return false;
+      return process.nextTick(callback);
     }
 
     // remove extension and then append back on .js
@@ -17,32 +23,39 @@ export default function(commander, filenames, opts) {
 
     const dest = getDest(commander, relative, base);
 
-    const data = util.compile(
+    util.compile(
       src,
       defaults(
         {
           sourceFileName: slash(path.relative(dest + "/..", src)),
-          sourceMapTarget: path.basename(relative),
         },
         opts,
       ),
+      function(err, res) {
+        if (err) return callback(err);
+        if (!res) return callback();
+
+        // we've requested explicit sourcemaps to be written to disk
+        if (
+          res.map &&
+          commander.sourceMaps &&
+          commander.sourceMaps !== "inline"
+        ) {
+          const mapLoc = dest + ".map";
+          res.code = util.addSourceMappingUrl(res.code, mapLoc);
+          res.map.file = path.basename(relative);
+          outputFileSync(mapLoc, JSON.stringify(res.map));
+        }
+
+        outputFileSync(dest, res.code);
+        util.chmod(src, dest);
+
+        compiledFiles += 1;
+
+        util.log(src + " -> " + dest);
+        return callback(null, true);
+      },
     );
-
-    if (!data) return false;
-
-    // we've requested explicit sourcemaps to be written to disk
-    if (data.map && commander.sourceMaps && commander.sourceMaps !== "inline") {
-      const mapLoc = dest + ".map";
-      data.code = util.addSourceMappingUrl(data.code, mapLoc);
-      outputFileSync(mapLoc, JSON.stringify(data.map));
-    }
-
-    outputFileSync(dest, data.code);
-    util.chmod(src, dest);
-
-    util.log(src + " -> " + dest);
-
-    return true;
   }
 
   function getDest(commander, filename, base) {
@@ -50,17 +63,57 @@ export default function(commander, filenames, opts) {
     return path.join(commander.outDir, filename);
   }
 
-  function handleFile(src, filename, base) {
-    const didWrite = write(src, filename, base);
-
-    if (!didWrite && commander.copyFiles) {
-      const dest = getDest(commander, filename, base);
-      outputFileSync(dest, fs.readFileSync(src));
-      util.chmod(src, dest);
+  function outputDestFolder(outDir) {
+    const outDirPath = path.resolve(outDir);
+    if (!fs.existsSync(outDirPath)) {
+      fs.mkdirSync(outDirPath);
     }
   }
 
-  function handle(filename) {
+  function handleFile(src, filename, base, callback) {
+    if (typeof base === "function") {
+      callback = base;
+      base = undefined;
+    }
+
+    write(src, filename, base, function(err, res) {
+      if (err) return callback(err);
+      if (!res && commander.copyFiles) {
+        const dest = getDest(commander, filename, base);
+        outputFileSync(dest, fs.readFileSync(src));
+        util.chmod(src, dest);
+      }
+
+      return callback();
+    });
+  }
+
+  function sequentialHandleFile(files, dirname, index, callback) {
+    if (files.length === 0) {
+      outputDestFolder(commander.outDir);
+      return;
+    }
+
+    if (typeof index === "function") {
+      callback = index;
+      index = 0;
+    }
+
+    const filename = files[index];
+    const src = path.join(dirname, filename);
+
+    handleFile(src, filename, dirname, function(err) {
+      if (err) return callback(err);
+      index++;
+      if (index !== files.length) {
+        sequentialHandleFile(files, dirname, index, callback);
+      } else {
+        callback();
+      }
+    });
+  }
+
+  function handle(filename, callback) {
     if (!fs.existsSync(filename)) return;
 
     const stat = fs.statSync(filename);
@@ -72,19 +125,39 @@ export default function(commander, filenames, opts) {
         util.deleteDir(commander.outDir);
       }
 
-      util
-        .readdir(dirname, commander.includeDotfiles)
-        .forEach(function(filename) {
-          const src = path.join(dirname, filename);
-          handleFile(src, filename, dirname);
-        });
+      const files = util.readdir(dirname, commander.includeDotfiles);
+      sequentialHandleFile(files, dirname, callback);
     } else {
-      write(filename, path.basename(filename), path.dirname(filename));
+      write(
+        filename,
+        path.basename(filename),
+        path.dirname(filename),
+        callback,
+      );
     }
   }
 
+  function sequentialHandle(filenames, index = 0) {
+    const filename = filenames[index];
+
+    handle(filename, function(err) {
+      if (err) throw new Error(err);
+      index++;
+      if (index !== filenames.length) {
+        sequentialHandle(filenames, index);
+      } else {
+        util.log(
+          `🎉  Successfully compiled ${compiledFiles} ${
+            compiledFiles > 1 ? "files" : "file"
+          } with Babel.`,
+          true,
+        );
+      }
+    });
+  }
+
   if (!commander.skipInitialBuild) {
-    filenames.forEach(handle);
+    sequentialHandle(filenames);
   }
 
   if (commander.watch) {
@@ -104,7 +177,9 @@ export default function(commander, filenames, opts) {
         watcher.on(type, function(filename) {
           const relative = path.relative(dirname, filename) || filename;
           try {
-            handleFile(filename, relative);
+            handleFile(filename, relative, function(err) {
+              if (err) throw err;
+            });
           } catch (err) {
             console.error(err.stack);
           }

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

@@ -16,7 +16,10 @@ export default function(commander, filenames, opts) {
 
   const buildResult = function() {
     const map = new sourceMap.SourceMapGenerator({
-      file: path.basename(commander.outFile || "") || "stdout",
+      file:
+        commander.sourceMapTarget ||
+        path.basename(commander.outFile || "") ||
+        "stdout",
       sourceRoot: opts.sourceRoot,
     });
 
@@ -103,19 +106,21 @@ export default function(commander, filenames, opts) {
     });
 
     process.stdin.on("end", function() {
-      results.push(
-        util.transform(
-          commander.filename,
-          code,
-          defaults(
-            {
-              sourceFileName: "stdin",
-            },
-            opts,
-          ),
+      util.transform(
+        commander.filename,
+        code,
+        defaults(
+          {
+            sourceFileName: "stdin",
+          },
+          opts,
         ),
+        function(err, res) {
+          if (err) throw err;
+          results.push(res);
+          output();
+        },
       );
-      output();
     });
   };
 
@@ -140,7 +145,9 @@ export default function(commander, filenames, opts) {
       }
     });
 
-    _filenames.forEach(function(filename) {
+    let filesProcessed = 0;
+
+    _filenames.forEach(function(filename, index) {
       let sourceFilename = filename;
       if (commander.outFile) {
         sourceFilename = path.relative(
@@ -150,7 +157,7 @@ export default function(commander, filenames, opts) {
       }
       sourceFilename = slash(sourceFilename);
 
-      const data = util.compile(
+      util.compile(
         filename,
         defaults(
           {
@@ -158,14 +165,18 @@ export default function(commander, filenames, opts) {
           },
           opts,
         ),
+        function(err, res) {
+          if (err) throw err;
+
+          filesProcessed++;
+          if (res) results[index] = res;
+
+          if (filesProcessed === _filenames.length) {
+            output();
+          }
+        },
       );
-
-      if (!data) return;
-
-      results.push(data);
     });
-
-    output();
   };
 
   const files = function() {

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

@@ -163,7 +163,7 @@ commander.option(
   "--include-dotfiles",
   "Include dotfiles when compiling and copying non-compilable files",
 );
-commander.option("-q, --quiet", "Don't log anything");
+commander.option("--verbose", "Log everything");
 commander.option(
   "--delete-dir-on-start",
   "Delete the out directory before compilation",
@@ -221,6 +221,17 @@ if (commander.deleteDirOnStart && !commander.outDir) {
   errors.push("--delete-dir-on-start requires --out-dir");
 }
 
+if (
+  !commander.outDir &&
+  filenames.length === 0 &&
+  typeof commander.filename !== "string" &&
+  commander.babelrc !== false
+) {
+  errors.push(
+    "stdin compilation requires either -f/--filename [filename] or --no-babelrc",
+  );
+}
+
 if (errors.length) {
   console.error(errors.join(". "));
   process.exit(2);
@@ -243,11 +254,12 @@ delete opts.outFile;
 delete opts.outDir;
 delete opts.copyFiles;
 delete opts.includeDotfiles;
-delete opts.quiet;
+delete opts.verbose;
 delete opts.configFile;
 delete opts.deleteDirOnStart;
 delete opts.keepFileExtension;
 delete opts.relative;
+delete opts.sourceMapTarget;
 
 // Commander will default the "--no-" arguments to true, but we want to leave them undefined so that
 // @babel/core can handle the default-assignment logic on its own.

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

@@ -46,29 +46,30 @@ export function addSourceMappingUrl(code, loc) {
   return code + "\n//# sourceMappingURL=" + path.basename(loc);
 }
 
-export function log(msg) {
-  if (!commander.quiet) console.log(msg);
+export function log(msg, force) {
+  if (force === true || commander.verbose) console.log(msg);
 }
 
-export function transform(filename, code, opts) {
+export function transform(filename, code, opts, callback) {
   opts = Object.assign({}, opts, {
     filename,
   });
 
-  return babel.transform(code, opts);
+  babel.transform(code, opts, callback);
 }
 
-export function compile(filename, opts) {
-  try {
-    return babel.transformFileSync(filename, opts);
-  } catch (err) {
-    if (commander.watch) {
-      console.error(err);
-      return { ignored: true };
-    } else {
-      throw err;
+export function compile(filename, opts, callback) {
+  babel.transformFile(filename, opts, function(err, res) {
+    if (err) {
+      if (commander.watch) {
+        console.error(err);
+        return callback(null, null);
+      } else {
+        return callback(err);
+      }
     }
-  }
+    return callback(null, res);
+  });
 }
 
 export function deleteDir(path) {

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

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

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

@@ -4,6 +4,7 @@
     "--out-dir", "lib",
     "--copy-files",
     "--include-dotfiles",
-    "--ignore", "src/foo"
+    "--ignore", "src/foo",
+    "--verbose"
   ]
 }

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

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

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

@@ -4,6 +4,7 @@
     "--out-dir", "lib",
     "--copy-files",
     "--include-dotfiles",
-    "--only", "src/foo"
+    "--only", "src/foo",
+    "--verbose"
   ]
 }

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

@@ -1,2 +1,3 @@
 src/foo/.foo.js -> lib/foo/.foo.js
 src/foo/bar.js -> lib/foo/bar.js
+🎉  Successfully compiled 2 files with Babel.

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

@@ -1,3 +1,3 @@
 {
-  "args": ["src", "--out-dir", "lib", "--copy-files", "--include-dotfiles"]
+  "args": ["src", "--out-dir", "lib", "--copy-files", "--include-dotfiles", "--verbose"]
 }

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

@@ -1,3 +1,4 @@
 src/.foo.js -> lib/.foo.js
 src/bar/index.js -> lib/bar/index.js
 src/foo/foo.js -> lib/foo/foo.js
+🎉  Successfully compiled 3 files with Babel.

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

@@ -3,6 +3,7 @@
     "src",
     "--out-dir", "lib",
     "--copy-files",
-    "--ignore", "src/foo/*"
+    "--ignore", "src/foo/*",
+    "--verbose"
   ]
 }

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

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

packages/babel-cli/test/fixtures/babel/--copy-files with only/options.json

@@ -3,6 +3,7 @@
     "src",
     "--out-dir", "lib",
     "--copy-files",
-    "--only", "src/foo/*"
+    "--only", "src/foo/*",
+    "--verbose"
   ]
 }

packages/babel-cli/test/fixtures/babel/--copy-files with only/stdout.txt

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

packages/babel-cli/test/fixtures/babel/--copy-files/options.json

@@ -1,3 +1,3 @@
 {
-  "args": ["src", "--out-dir", "lib", "--copy-files"]
+  "args": ["src", "--out-dir", "lib", "--copy-files", "--verbose"]
 }

packages/babel-cli/test/fixtures/babel/--copy-files/stdout.txt

@@ -1,2 +1,3 @@
 src/bar/index.js -> lib/bar/index.js
 src/foo/foo.js -> lib/foo/foo.js
+🎉  Successfully compiled 2 files with Babel.

packages/babel-cli/test/fixtures/babel/--ignore complete/options.json

@@ -1,3 +1,3 @@
 {
-  "args": ["src", "--out-dir", "lib", "--ignore", "src/bar"]
+  "args": ["src", "--out-dir", "lib", "--ignore", "src/bar", "--verbose"]
 }

packages/babel-cli/test/fixtures/babel/--ignore complete/stdout.txt

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

packages/babel-cli/test/fixtures/babel/--ignore glob/options.json

@@ -1,3 +1,3 @@
 {
-  "args": ["src", "--out-dir", "lib", "--ignore", "**/*.foo.js"]
+  "args": ["src", "--out-dir", "lib", "--ignore", "**/*.foo.js", "--verbose"]
 }

packages/babel-cli/test/fixtures/babel/--ignore glob/stdout.txt

@@ -2,3 +2,4 @@ src/a.js -> lib/a.js
 src/b.js -> lib/b.js
 src/baz/c.js -> lib/baz/c.js
 src/foo.js -> lib/foo.js
+🎉  Successfully compiled 4 files with Babel.

packages/babel-cli/test/fixtures/babel/--ignore/options.json

@@ -1,3 +1,3 @@
 {
-  "args": ["src", "--out-dir", "lib", "--ignore", "src/foo/*"]
+  "args": ["src", "--out-dir", "lib", "--ignore", "src/foo/*", "--verbose"]
 }

packages/babel-cli/test/fixtures/babel/--ignore/stdout.txt

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

packages/babel-cli/test/fixtures/babel/--only glob/options.json

@@ -1,3 +1,3 @@
 {
-  "args": ["src", "--out-dir", "lib", "--only", "**/*.foo.js"]
+  "args": ["src", "--out-dir", "lib", "--only", "**/*.foo.js", "--verbose"]
 }

packages/babel-cli/test/fixtures/babel/--only glob/stdout.txt

@@ -1,2 +1,3 @@
 src/a.foo.js -> lib/a.foo.js
 src/baz/b.foo.js -> lib/baz/b.foo.js
+🎉  Successfully compiled 2 files with Babel.

packages/babel-cli/test/fixtures/babel/--only/options.json

@@ -1,3 +1,3 @@
 {
-  "args": ["src", "--out-dir", "lib", "--only", "src/bar/*"]
+  "args": ["src", "--out-dir", "lib", "--only", "src/bar/*", "--verbose"]
 }

packages/babel-cli/test/fixtures/babel/--only/stdout.txt

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

packages/babel-cli/test/fixtures/babel/dir --out-dir --copy-files/options.json

@@ -1,3 +1,3 @@
 {
-  "args": ["src", "--out-dir", "lib", "--copy-files"]
+  "args": ["src", "--out-dir", "lib", "--copy-files", "--verbose"]
 }

packages/babel-cli/test/fixtures/babel/dir --out-dir --copy-files/stdout.txt

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

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

@@ -1,3 +1,3 @@
 {
-  "args": ["src", "--out-dir", "lib", "--keep-file-extension"]
+  "args": ["src", "--out-dir", "lib", "--keep-file-extension", "--verbose"]
 }

packages/babel-cli/test/fixtures/babel/dir --out-dir --keep-file-extension/stdout.txt

@@ -1,2 +1,3 @@
 src/bar.mjs -> lib/bar.mjs
 src/foo.js -> lib/foo.js
+🎉  Successfully compiled 2 files with Babel.

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

@@ -1,3 +1,3 @@
 {
-  "args": ["**/src", "--out-dir", "../lib", "--relative"]
+  "args": ["**/src", "--out-dir", "../lib", "--relative", "--verbose"]
 }

packages/babel-cli/test/fixtures/babel/dir --out-dir --relative/stdout.txt

@@ -2,3 +2,4 @@ package1/src/bar/bar1.js -> package1/lib/bar/bar1.js
 package1/src/foo1.js -> package1/lib/foo1.js
 package2/src/bar/bar2.js -> package2/lib/bar/bar2.js
 package2/src/foo2.js -> package2/lib/foo2.js
+🎉  Successfully compiled 4 files with Babel.

packages/babel-cli/test/fixtures/babel/dir --out-dir --source-maps inline/options.json

@@ -1,3 +1,3 @@
 {
-  "args": ["src", "--source-maps", "inline", "--out-dir", "lib"]
+  "args": ["src", "--source-maps", "inline", "--out-dir", "lib", "--verbose"]
 }

packages/babel-cli/test/fixtures/babel/dir --out-dir --source-maps inline/out-files/lib/bar/bar.js

@@ -7,4 +7,4 @@ function _classCallCheck(instance, Constructor) { if (!_instanceof(instance, Con
 var Test = function Test() {
   _classCallCheck(this, Test);
 };
-//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbIi4uLy4uL3NyYy9iYXIvYmFyLmpzIl0sIm5hbWVzIjpbIlRlc3QiXSwibWFwcGluZ3MiOiI7Ozs7OztJQUFNQSxJIiwiZmlsZSI6ImJhci5qcyIsInNvdXJjZXNDb250ZW50IjpbImNsYXNzIFRlc3Qge1xuXG59Il19
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbIi4uLy4uL3NyYy9iYXIvYmFyLmpzIl0sIm5hbWVzIjpbIlRlc3QiXSwibWFwcGluZ3MiOiI7Ozs7OztJQUFNQSxJIiwic291cmNlc0NvbnRlbnQiOlsiY2xhc3MgVGVzdCB7XG5cbn0iXX0=

packages/babel-cli/test/fixtures/babel/dir --out-dir --source-maps inline/out-files/lib/foo.js

@@ -3,4 +3,4 @@
 arr.map(function (x) {
   return x * MULTIPLIER;
 });
-//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbIi4uL3NyYy9mb28uanMiXSwibmFtZXMiOlsiYXJyIiwibWFwIiwieCIsIk1VTFRJUExJRVIiXSwibWFwcGluZ3MiOiI7O0FBQUFBLElBQUlDLEdBQUosQ0FBUTtBQUFBLFNBQUtDLElBQUlDLFVBQVQ7QUFBQSxDQUFSIiwiZmlsZSI6ImZvby5qcyIsInNvdXJjZXNDb250ZW50IjpbImFyci5tYXAoeCA9PiB4ICogTVVMVElQTElFUik7Il19
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbIi4uL3NyYy9mb28uanMiXSwibmFtZXMiOlsiYXJyIiwibWFwIiwieCIsIk1VTFRJUExJRVIiXSwibWFwcGluZ3MiOiI7O0FBQUFBLElBQUlDLEdBQUosQ0FBUTtBQUFBLFNBQUtDLElBQUlDLFVBQVQ7QUFBQSxDQUFSIiwic291cmNlc0NvbnRlbnQiOlsiYXJyLm1hcCh4ID0+IHggKiBNVUxUSVBMSUVSKTsiXX0=

packages/babel-cli/test/fixtures/babel/dir --out-dir --source-maps inline/stdout.txt

@@ -1,2 +1,3 @@
 src/bar/bar.js -> lib/bar/bar.js
 src/foo.js -> lib/foo.js
+🎉  Successfully compiled 2 files with Babel.

packages/babel-cli/test/fixtures/babel/dir --out-dir --source-maps/options.json

@@ -1,3 +1,3 @@
 {
-  "args": ["src", "--source-maps", "--out-dir", "lib"]
+  "args": ["src", "--source-maps", "--out-dir", "lib", "--verbose"]
 }

packages/babel-cli/test/fixtures/babel/dir --out-dir --source-maps/out-files/lib/bar/bar.js.map

@@ -1 +1 @@
-{"version":3,"sources":["../../src/bar/bar.js"],"names":["Test"],"mappings":";;;;;;IAAMA,I","file":"bar.js","sourcesContent":["class Test {\n\n}"]}
+{"version":3,"sources":["../../src/bar/bar.js"],"names":["Test"],"mappings":";;;;;;IAAMA,I","sourcesContent":["class Test {\n\n}"],"file":"bar.js"}

packages/babel-cli/test/fixtures/babel/dir --out-dir --source-maps/out-files/lib/foo.js.map

@@ -1 +1 @@
-{"version":3,"sources":["../src/foo.js"],"names":["arr","map","x","MULTIPLIER"],"mappings":";;AAAAA,IAAIC,GAAJ,CAAQ;AAAA,SAAKC,IAAIC,UAAT;AAAA,CAAR","file":"foo.js","sourcesContent":["arr.map(x => x * MULTIPLIER);"]}
+{"version":3,"sources":["../src/foo.js"],"names":["arr","map","x","MULTIPLIER"],"mappings":";;AAAAA,IAAIC,GAAJ,CAAQ;AAAA,SAAKC,IAAIC,UAAT;AAAA,CAAR","sourcesContent":["arr.map(x => x * MULTIPLIER);"],"file":"foo.js"}

packages/babel-cli/test/fixtures/babel/dir --out-dir --source-maps/stdout.txt

@@ -1,2 +1,3 @@
 src/bar/bar.js -> lib/bar/bar.js
 src/foo.js -> lib/foo.js
+🎉  Successfully compiled 2 files with Babel.

packages/babel-cli/test/fixtures/babel/dir --out-dir --verbose/in-files/src/bar/bar.js

@@ -0,0 +1,3 @@
+class Test {
+
+}

packages/babel-cli/test/fixtures/babel/dir --out-dir --verbose/in-files/src/foo.js

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

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

@@ -0,0 +1,3 @@
+{
+  "args": ["src", "--out-dir", "lib", "--verbose"]
+}

packages/babel-cli/test/fixtures/babel/dir --out-dir --verbose/out-files/lib/bar/bar.js

@@ -0,0 +1,9 @@
+"use strict";
+
+function _instanceof(left, right) { if (right != null && typeof Symbol !== "undefined" && right[Symbol.hasInstance]) { return right[Symbol.hasInstance](left); } else { return left instanceof right; } }
+
+function _classCallCheck(instance, Constructor) { if (!_instanceof(instance, Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+var Test = function Test() {
+  _classCallCheck(this, Test);
+};

packages/babel-cli/test/fixtures/babel/dir --out-dir --verbose/out-files/lib/foo.js

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

packages/babel-cli/test/fixtures/babel/dir --out-dir --verbose/stdout.txt

@@ -0,0 +1,3 @@
+src/bar/bar.js -> lib/bar/bar.js
+src/foo.js -> lib/foo.js
+🎉  Successfully compiled 2 files with Babel.

packages/babel-cli/test/fixtures/babel/dir --out-dir/stdout.txt

@@ -1,2 +1 @@
-src/bar/bar.js -> lib/bar/bar.js
-src/foo.js -> lib/foo.js
+🎉  Successfully compiled 2 files with Babel.

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

@@ -0,0 +1,3 @@
+{
+  "args": ["src", "--out-dir", "lib"]
+}

packages/babel-cli/test/fixtures/babel/filename --out-dir --relative/options.json

@@ -1,3 +1,3 @@
 {
-  "args": ["src/foo.js", "--out-dir", "../lib", "--relative"]
+  "args": ["src/foo.js", "--out-dir", "../lib", "--relative", "--verbose"]
 }

packages/babel-cli/test/fixtures/babel/filename --out-dir --relative/stdout.txt

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

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

@@ -1,3 +1,3 @@
 {
-  "args": ["src/foo.js", "--out-dir", "lib"]
+  "args": ["src/foo.js", "--out-dir", "lib", "--verbose"]
 }

packages/babel-cli/test/fixtures/babel/filename --out-dir/stdout.txt

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

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

@@ -1,3 +1,3 @@
 {
-  "args": ["--out-file", "script.js"]
+  "args": ["--out-file", "script.js", "-f", "file.js"]
 }