v4.4.2

Links the babel logo in the readme to the home page

.babelrc

@@ -0,0 +1,5 @@
+{
+  "experimental": true,
+  "playground": true,
+  "loose": true
+}

.editorconfig

@@ -5,7 +5,8 @@ insert_final_newline = true
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
+end_of_line = lf
 
-[*.js]
+[*.{js,json}]
 indent_style = space
 indent_size = 2

.gitignore

@@ -11,5 +11,5 @@ test/tmp
 coverage
 dist
 .package.json
-packages/6to5-runtime/*.js
-packages/6to5-runtime/regenerator/*.js
+packages/babel-runtime/*.js
+packages/babel-runtime/regenerator/*.js

.gitmodules

@@ -3,7 +3,10 @@
 	url = https://github.com/google/traceur-compiler
 [submodule "vendor/regenerator"]
 	path = vendor/regenerator
-	url = https://github.com/6to5/regenerator-6to5
+	url = https://github.com/babel/regenerator-babel
 [submodule "vendor/test262"]
 	path = vendor/test262
 	url = https://github.com/tc39/test262
+[submodule "vendor/compat-table"]
+	path = vendor/compat-table
+	url = https://github.com/kangax/compat-table

.istanbul.yml

@@ -0,0 +1,2 @@
+instrumentation:
+  root: lib

.jscsrc

@@ -1,5 +1,5 @@
 {
-  "excludeFiles": ["lib/6to5/transformation/templates"],
+  "excludeFiles": ["lib/babel/transformation/templates"],
   "disallowSpacesInNamedFunctionExpression": {
     "beforeOpeningRoundBrace": true
   },
@@ -14,7 +14,6 @@
   },
   "disallowSpacesInsideArrayBrackets": true,
   "disallowSpacesInsideParentheses": true,
-  "disallowQuotedKeysInObjects": true,
   "disallowSpaceAfterObjectKeys": true,
   "disallowSpaceAfterPrefixUnaryOperators": true,
   "disallowSpaceBeforePostfixUnaryOperators": true,
@@ -33,10 +32,8 @@
   "requireCommaBeforeLineBreak": true,
   "requireSpaceBeforeBinaryOperators": true,
   "requireSpaceAfterBinaryOperators": true,
-  "requireCamelCaseOrUpperCaseIdentifiers": true,
   "requireLineFeedAtFileEnd": true,
   "requireCapitalizedConstructors": true,
-  "requireDotNotation": true,
   "requireSpacesInForStatement": true,
   "requireCurlyBraces": [
     "do"
@@ -52,7 +49,8 @@
     "return",
     "try",
     "catch",
-    "typeof"
+    "typeof",
+    "function"
   ],
   "validateLineBreaks": "LF",
   "validateQuoteMarks": "\"",

.jshintignore

@@ -1 +1 @@
-lib/6to5/transformation/templates
+lib/babel/transformation/templates

.jshintrc

@@ -2,6 +2,7 @@
   "esnext": true,
   "indent": 2,
   "freeze": true,
+  "validthis": true,
   "camelcase": true,
   "unused": true,
   "eqnull": true,

.npmignore

@@ -1,7 +1,7 @@
 node_modules
 *.log
 *.cache
-lib/6to5/transformation/templates
+lib/babel/transformation/templates
 test
 benchmark
 Makefile

.travis.yml

@@ -2,7 +2,8 @@ sudo: false
 language: node_js
 node_js:
   - "0.10"
-  - "0.11"
+  - "0.12"
+  - "iojs"
 
 branches:
   except:

CHANGELOG.md

@@ -11,842 +11,60 @@
 
 _Note: Gaps between patch versions are faulty/broken releases._
 
-## 3.0.9
+See [CHANGELOG - 6to5](CHANGELOG-6to5.md) for the pre-4.0.0 version changelog.
 
- * **Bug Fix**
-  * Make `t.isReferenced` more powerful, actually take into consideration all contexts were identifier nodes aren't actually references.
-  * Don't camelcase underscores when converting a string to a valid identifier.
+## 4.4.2
 
-## 3.0.8
-
- * **Bug Fix**
-  * Split up default function declaration exports due to regenerator destroying the parent export declaration.
-
-## 3.0.7
-
- * **Internal**
-  * Upgrade `core-js` to `0.4.9`.
- * **Bug Fix**
-  * Add id to function express scope tracking.
-
-## 3.0.6
-
- * **Bug Fix**
-  * Fix block scope variable tracking stopping whenever it hits a new scope.
-  * Fix block scope variable tracking breaking on all block statement scopes that have a for loop parent.
-
-## 3.0.5
-
- * **Internal**
-  * More reliable default parameter scope.
-
-## 3.0.4
-
- * **Bug Fix**
-  * Remove traversal stops from block scope tracking.
-
-## 3.0.3
-
- * **Internal**
-  * Ignore options starting with `_`.
-
-## 3.0.2
-
- * **Internal**
-  * Add common plugin options to valid options list.
-
-## 3.0.1
-
- * **Internal**
-  * Downgrade `kexec` as `1.1.0` throws compilation errors.
-
-## 3.0.0
-
- * **Polish**
-  * Generated code autoindentation.
-  * Moved global uid registry to a scope registry resulting in nicer uids.
-  * `this` is now illegal in the top level scope when using the default `useStrict` transformer.
-  * New `asyncToGenerator` helper that's much more compact.
-  * Throw errors on unknown options.
-  * More reliable default parameter scope.
-  * Helpers are now compact and have no newlines.
- * **Internal**
-  * Rewritten a lot of the internals to much simpler.
-  * Removed TDZ from default parameters as it was very wonky and unreliable.
-  * Upgrade `core-js` to `0.4.6`.
-  * Upgrade `acorn-6to5`.
-   * JSX support is now on-par with react-tools/esprima.
-   * Shorthand destructuring.
- * **Bug Fix**
-  * Generators now work flawlessly with any parameter transformers.
-  * Optional async function transformers should not name their functions.
-  * Remove `unlink` event watching in `bin/6to5`.
-  * Fix regenerator variable declarations being incorrectly hoisted breaking scope.
-  * Transformers that attempted to simplify expressions that had no consequence now take into account whether it's one of the last statements/expressions in the script.
  * **New Feature**
-  * New `selfContained` transformer.
-  * New `undeclaredVariableCheck` optional transformer.
-  * Added `--blacklist` and `--whitelist` options to `6to5-node`.
+  * Add `moduleId` option for specifying a custom module id.
+
+## 4.4.0
+
+ * **New Feature**
+  * `/*** @jsx NAMESPACE **/` comments are now honored by the `react` transformer.
+  * `getModuleName` option.
+  * Infer function expression names. Thanks [@RReverser](https://github.com/RReverser)!
+ * **Bug Fix**
+  * Add proper control flow for tail recursion optimisation.
+ * **Internal**
+  * Remove useless `format` options and move the `format.compact` option to `format`.
+ * **Polish**
+  * Newline handling of the code generator has been heavily improved.
+  * Code generator now deopts whitespace if the input size is >100KB.
+
+## 4.3.0
+
  * **Breaking Change**
-  * Caching is now always enabled for the require hook. It also now no longer caches require resolutions.
-  * Bare `super();` only works inside of constructors.
-  * Removed the optional runtime in favor of the `selfContained` transformer.
-  * This shorthand has been removed from the playground.
-  * `6to5/polyfill` can now only be required **once**.
-  * **CLI**
-   * `--indent` option has been removed.
-   * `--include-regenerator` option has been removed.
-   * `--amd-modules-id` option has been removed, use `--module-ids` instead.
-  * **Options**
-   * `amdModuleIds` option has been removed, use `moduleIds` instead.
-   * `includeRegenerator` has been removed.
-   * `ignoreRegex` fallback has now been dropped from the require hook. `register(/foo/);`, `register({ ignoreRegex: /foo/ })` -> `register({ ignore: /foo/ })`.
-  * **Modules**
-    * Module interop now only collapses to `module.exports` when there's a **single** export that's default.
-    * Imports and exports are now illegal anywhere except the root level by default. Set `modules` to [loose mode](http://6to5.org/docs/usage/loose) to allow them everywhere.
-  * **Transformers**
-    * Optional fast transformer backwards compatibility support has been removed. Use [loose mode](https://6to5.org/docs/usage/loose).
-    * Removed the `coreAliasing` transformer in favor of `selfContained`.
-    * Renamed transformers:
-     * `specNoForInOfAssignment` -> `validation.noForInOfAssignment`
-     * `specSetters` -> `validation.setters`
-     * `specBlockScopedFunctions` -> `spec.blockScopedFunctions`
-     * `malletOperator` -> `playground.malletOperator`
-     * `methodBinding` -> `playground.methodBinding`
-     * `memoizationOperator` -> `playground.memoizationOperator`
-     * `objectGetterMemoization` -> `playground.objectGetterMemoization`
-     * `modules` -> `es6.modules`
-     * `propertyNameShorthand` -> `es6.properties.shorthand`
-     * `arrayComprehension` -> `es7.comprehensions`
-     * `generatorComprehension` -> `es7.comprehensions`
-     * `arrowFunctions` -> `es6.arrowFunctions`
-     * `classes` -> `es6.classes`
-     * `objectSpread` -> `es7.objectSpread`
-     * `exponentiationOperator` -> `es7.exponentiationOperator`
-     * `spread` -> `es6.spread`
-     * `templateLiterals` -> `es6.templateLiterals`
-     * `propertyMethodAssignment` -> `es6.properties.shorthand`
-     * `computedPropertyNames` -> `es6.properties.computed`
-     * `defaultParameters` -> `es6.parameters.default`
-     * `restParameters` -> `es6.parameters.rest`
-     * `destructuring` -> `es6.destructuring`
-     * `forOf` -> `es6.forOf`
-     * `unicodeRegex` -> `es6.unicodeRegex`
-     * `abstractReferences` -> `es7.abstractReferences`
-     * `constants` -> `es6.constants`
-     * `letScoping` -> `es6.blockScoping`
-     * `blockScopingTDZ` -> `es6.blockScopingTDZ`
-     * `generators` -> `regenerator`
-     * `protoToAssign` -> `spec.protoToAssign`
-     * `typeofSymbol` -> `spec.typeofSymbol`
-     * `coreAliasing` -> `selfContained`
-     * `undefinedToVoid` -> `spec.undefinedToVoid`
-     * `undeclaredVariableCheck` -> `validation.undeclaredVariableCheck`
-     * `specPropertyLiterals` -> `minification.propertyLiterals`
-     * `specMemberExpressionLiterals` -> `minification.memberExpressionLiterals`
+  * Remove `commonStandard` module formatter and make it the default behaviour of all the strict module formatters.
 
-## 2.13.7
-
- * **Bug Fix**
-  * Don't realias variables that are already declared in optional `coreAliasing` transformer.
-
-## 2.13.6
-
- * **Bug Fix**
-  * Add `NewExpression` as a valid parent for parentheses insertion for `ConditionalExpression`.
-
-## 2.13.5
-
- * **Bug Fix**
-  * Allow rest parameters to be destructuring patterns.
- * **Internal**
-  * Upgrade `kexec` to `1.1.0`.
-
-## 2.13.4
-
- * **Bug Fix**
-  * Fix ordering of destructuring and default params.
-  * Fix loop body scope.
-  * Fix `for...of` transformation not retaining it's scope.
-  * Add destructuring assignment support to scope tracking.
- * **Polish**
-  * More reliable newlines for pretty printing variable declarations.
-
-## 2.13.3
-
- * **Internal**
-  * Add `coverage` and `vendor` to npmignore.
-
-## 2.13.2
-
- * **Bug Fix**
-  * Fix `super` inside of nested functions.
- * **Internal**
-  * Move let scoping TDZ into a separate transformer until it's more solid.
-  * Use `process.stdin.write` instead of `console.log` in `bin` to avoid sprintfification.
-
-## 2.13.1
-
- * **New Feature**
-  * Temporal dead zone for block binding.
-
-## 2.13.0
-
- * **New Feature**
-  * Block scoped functions.
-  * Add `--loose all` option.
-  * Add playground mallet operator thanks to [@jridgewell](https://github.com/jridgewell).
- * **Bug Fix**
-  * Rewrote large parts of the let scoping transformer. Now passes all known tests.
- * **Internal**
-  * Even more optimisations thanks to the awesome [@gaearon](https://github.com/gaearon).
-  * Upgrade `acorn-6to5`.
-    * Fixes exponentation operator thanks to [@charliesome](https://github.com/charliesome).
-    * Fix flow optional parameters with types.
-  * Upgrade `chokidar` to `0.12.6`.
-  * Upgrade `commander` to `2.6.0`.
-  * Upgrade `core-js` to `0.4.5`.
-  * Upgrade `estraverse` to `1.9.1`.
-  * Upgrade `jshint` to `2.5.11`.
-  * Upgrade `regenerator` to `0.8.9`.
-  * Upgrade `regexpu` to `1.0.0`.
-  * Upgrade `source-map` to `0.1.43`.
-  * Upgrade `source-map-support` to `0.2.9`.
-  * Upgrade `browserify` to `8.1.1`.
-  * Upgrade `chai` to `1.10.0`.
-  * Upgrade `istanbul` to `0.3.5`.
-  * Upgrade `mocha` to `2.1.0`.
-  * Upgrade `uglify-js` to `2.4.16`.
-
-## 2.12.6
-
- * **Bug Fix**
-  * Add missing flow type traversal keys.
-
-## 2.12.5
-
- * **Internal**
-  * Fix incorrect `for...in` loop still causing `ember-script` issues.
-
-## 2.12.4
+## 4.2.1
 
  * **Polish**
-  * Rest parameters now allocate the array before populating.
- * **Internal**
-  * `for...in` loops have been changed to optimised `for` loops - better performance and no enumeration of protoype keys.
-  * Parts of the code generator have now been optimised thanks to [gaearon](https://github.com/gaearon).
+  * Add auxiliary comment to let scoping closure flow control.
 
-## 2.12.3
-
- * **Spec Compliancy**
-  * Optional `typeof` transformer checks for `undefined` before passing it to the helper.
-  * Class methods are now named.
-
-## 2.12.2
-
- * **Internal**
-  * Exclude nodes in function parameters and catch clauses from `isReferenced` check.
-
-## 2.12.1
-
- * **Internal**
-  * Add `.jsx` to list of allowed extensions.
-
-## 2.12.0
-
- * **Bug Fix**
-  * Support non-string JSX literals.
- * **New Feature**
-  * Loose mode for some transformers that enables non-spec behaviour.
- * **Internal**
-  * Uglify `--mangle sort` has been added to the build script, cutting minified scripts in half.
-
-## 2.11.4
-
- * **Internal**
-  * Make all dependency versions fixed.
-
-## 2.11.3
-
- * **Bug Fix**
-  * Allow a string to be passed as the `optional` option.
-
-## 2.11.2
-
- * **Bug Fix**
-  * Support esprima-style catch clause handlers.
- * **Polish**
-  * Don't print a stacktrace for syntax errors in the CLI.
-
-## 2.11.1
-
- * **Bug Fix**
-  * Remove stray `console.log` outputting debug code.
-  * Remove `Dict` from `coreAliasing`.
-
-## 2.11.0
-
- * **Bug Fix**
-  * Fix unnecessary IIFE in default parameters on method calls.
-  * Add support for supers inside of closures.
- * **New Feature**
-  * Add `--keep-module-id-extensions`/`keepModuleIdExtensions` option to keep extensions in module ids.
- * **Polish**
-  * Special case single argument spread properties in `super` inside classes.
-  * Don't use a variable declaration for class declaration IFFE.
-  * Rename `inherits` helper parameters.
-  * `coreAliasing` transformer now aliases `Promise`, `Set`, `Map` and more. Thanks [@AluisioASG](https://github.com/AluisioASG).
-
-## 2.10.1
-
- * **Internal**
-  * Upgrade `core-js` to `0.4.4`.
- * **New Feature**
-  * Added `--include-regenerator` option to CLI and `includeRegenerator` option to API that includes the regenerator runtime if necessary.
-
-## 2.10.0
-
- * **New Feature**
-  * Add `classesFastSuper` optional transformer that doesn't support parent getters and prototype changing.
-  * Add `forOfFast` transformer that speeds up `for...of` on arrays but produces more code.
-  * Add `--react-compat` to `bin/6to5`.
- * **Spec Compliancy**
-  * Disallow setters without a single parameter.
-  * Add `configurable` and `writable` to defined properties.
-  * Use define instead of assignment for class methods.
- * **Polish**
-  * Fix bin name in `6to5-node --help`.
-  * Fix shorthand `--whitelist` name in `bin/6to5`.
- * **Internal**
-  * Hot code optimisation of traversal etc thanks to [gaearon](https://github.com/gaearon).
-
-## 2.9.4
-
- * **Bug Fix**
-  * Support `UpdateExpression`s as `MemberExpression` objects.
-
-## 2.9.3
-
- * **Bug Fix**
-  * Remove `exportsWildcard` helper in favor of `defaults`.
-
-## 2.9.2
-
- * **Bug Fix**
-  * Pass `exports` to `exportWildcard` helper to allow for use inside the optional runtime.
-
-## 2.9.1
-
- * **Bug Fix**
-  * Fix runtime generator breaking the helper inclusion loop.
-
-## 2.9.0
-
- * **Internal**
-  * Upgrade `acorn-6to5`.
-    * Now supports destructuring shorthand properties.
-
-## 2.8.1
-
- * **Bug Fix**
-  * Fix computed accessors on object literals.
-
-## 2.8.0
-
- * **New Feature**
-  * Add `commonStrict`, `amdStrict` and `umdStrict` module formatters that remove `module.exports` interop assignment.
-  * Add `--indent` option to the 6to5 CLI.
-
-## 2.7.4
+## 4.2.0
 
  * **Polish**
-  * Inherit assignments from their declaration in destructuring.
-  * Properly align multi-declarator variable declarations.
-
-## 2.7.3
-
- * **Polish**
-  * Indent and add newlines to `React.createElement` calls in `react` transformer.
-  * Remove `Object.assign` calls and replace it with an `extends` helper.
-
-## 2.7.1
-
- * **New Feature**
-  * Expose `version` on browser and node API.
+  * Use an assignment instead of a define for `__esModule` in loose mode.
  * **Internal**
-  * Upgrade `core-js` to 0.4.1
+  * Add error for `eval();` usage and enable strict mode for parsing.
 
-## 2.7.0
+## 4.1.0
 
- * **Spec Compliancy**
-  * Disallow reassignments of imports.
  * **New Feature**
-  * `reactCompat` option to enable pre-v0.12 react components.
-
-## 2.6.3
-
- * **Bug Fix**
-  * Fix 2.6.0 regression caused by faulty export default from a source handling.
-
-## 2.6.2
-
- * **Bug Fix**
-  * Fix rest parameter keys when on functions with params.
-
-## 2.6.1
-
- * **Bug Fix**
-  * Fix rest parameter arguments key.
-
-## 2.6.0
-
- * **Bug Fix**
-  * Better handling of number literal property keys.
-  * Handle `NewExpression` paren insertion edegcases better.
+  * Add `BABEL_CACHE_PATH` and `BABEL_DISABLE_CACHE` environment variables.
  * **Internal**
-  * Fix incorrect AST node `identifier("this")`.
-  * Better `toIdentifier` method that handles reserved words.
-  * Upgrade `acorn-6to5`.
-    * Fix exponentiation operator precedence.
-    * Fix line terminators after async contextual keywords.
-    * Add semicolons as class elements inside of a class body.
-  * Upgrade to `core-js` 4.0.0.
-  * Upgrade to `regenerator` 0.8.3.
-    * Fix non-loop labeled statements.
- * **New Feature**
-  * Basic destructuring defaults
-  * Add `.es` to list of supported extensions.
-  * Add optional `typeofSymbol` transformer.
-  * Use a `for` loop for rest parameters instead of `Array.prototype.slice`.
+  * Replace many internal util functions with modules. Thanks [@sindresorhus](https://github.com/sindresorhus)!
+
+## 4.0.2
+
+ * **Bug Fix**
+  * Fix generators not properly propagating their internal declarations.
  * **Polish**
-  * Move `"use strict";` to inside module bodies instead of at the top of the file.
-  * Better handling of dynamic imports.
- * **Spec Compliancy**
-  * Class inheritance now has a `function` or `null` type check.
-  * Add `interopRequireWildcard` around wildcard imports and exports to handle non-object exports.
+  * Update setter param length error message.
+  * Use ranges on dependencies.
 
-## 2.5.0
+## 4.0.0
 
- * Remove `noDuplicateProperties` transformer.
- * Better generated UIDs based on nodes.
- * Default parameters now use `arguments[i]`, conditionals and variable declarations instead of using long-form if statements.
-
-## 2.4.10
-
- * Upgrade `acorn-6to5`.
-
-## 2.4.9
-
- * Upgrade `acorn-6to5`.
- * Add optional `protoToAssign` transformer.
- * Fix missing properties from computed property keys.
- * Make ES7 comprehensions `let` variables.
-
-## 2.4.8
-
- * Make `require("6to5/register")` work with browserify - [#370](https://github.com/6to5/6to5/pull/370). Thanks [@hughsk](https://github.com/hughsk)!
-
-## 2.4.7
-
- * Upgrade `acorn-6to5`.
-
-## 2.4.6
-
- * Move `coreAliasing` and `undefinedToVoid` transformers down to catch `moduleFormatter` transforms.
-
-## 2.4.5
-
- * Avoid printing comments if they've already been output.
-
-## 2.4.4
-
- * Add `module` type to browser build `<script>` handler.
- * Fix some `MemberExpression` modifying incorrectly setting `property` to a `MemberExpression`.
-
-## 2.4.3
-
- * Upgrade `acorn-6to5`.
- * Add support for `FunctionDeclaration`s in `bluebirdCoroutines` and `asyncToGenerators` transformers.
-
-## 2.4.2
-
- * Upgrade `acorn-6to5`.
- * Better uids generated for various transformers based on parent node.
- * Alias flat references in `coreAliasing` transformer.
-
-## 2.4.1
-
- * Better whitespace handling of parenthesized expressions due to trailing comments.
- * Fix `yield` inside of comprehensions.
-
-## 2.4.0
-
- * Use a closure always for classes with a super.
- * Always use native loops for array comprehensions.
- * Allow `yield` inside of comprehensions.
- * Add optional `bluebirdCoroutine` transformer.
- * Add optional `asyncToGenerator` transformer.
- * Move `useStrict` transformer to before `_moduleFormatter` causing `"use strict";` to always be placed the very top.
-
-## 2.3.2
-
- * Add parens on expressions with trailing comments.
-
-## 2.3.1
-
- * Add `undefinedToVoid` optional transformer.
- * Use `Object.defineProperty` for computed properties.
-
-## 2.3.0
-
- * Upgrade `acorn-6to5`.
- * Support circular references and hoist variable declarations in `system` module formatter.
- * Add optional transformers, including a new `coreAliasing` transformer that aliases native ES6 static properties to their `core-js` equivalent.
-
-## 2.2.0
-
- * Make `system` module formatter modules anonymous by default.
- * Fix duplicate comments being output, breaking code.
-
-## 2.1.0
-
- * Add `cache` option to register hook.
- * Update `core-js`.
- * Fix starting newline not being added on case statements.
- * Fix destructuring `VariableDeclaration`s not inside `BlockStatement`s and `Program`.
-
-## 2.0.4
-
- * Avoid being greedy when destructuring array iterables.
-
-## 2.0.3
-
- * Hoist function declarations in system module formatter for circular references.
- * Hoist default function declarations in umd and amd module formatters for circular references.
-
-## 2.0.2
-
- * Inherit comments in `for-of` transformer.
- * Remove `interopRequire` from `system` module formatter.
-
-## 2.0.1
-
- * Remap `UpdateExpression` module export binding.
- * Fix automatic closure on `PrivateDeclaration` in classes.
-
-## 2.0.0
-
- * Make string literal generation only escapes unicode that it has to.
- * Internal code generation format options have been exposed.
- * Change playground method binding operator from `:` to `#` removing ambiguous syntax with terns.
- * Fix rest parameters in async and generator functions.
- * Export/import declarations replace by the modules transformer now inherit comments.
- * Added playground flag to `6to5-node`.
- * `6to5-node` now behaves the same as `node`.
- * `6to5-node` now uses `kexec` to become the forked process to correctly propagate signals on unix.
- * Constants are now block scoped.
- * Exposed ast transformer.
- * Merged `commonInterop` and `common` module formatters.
- * Fix generator comprehensions not inheriting `arguments`, `this` etc.
- * Object and class mutator shorthand are now enumerable.
- * Remove regenerator `Generator has already finished` error which isn't spec-compliant.
- * Expose internal `spec` transformers that nicen up code output.
- * Add export variable declaration default initializers.
- * Propagate export declaration reassignments.
- * Add initializer default to block scoped variable declarations within a loop.
- * Flow type support.
- * Make async/await contextual keywords.
- * Allow `yield`ing of non-objects.
- * Class declarations now lack an IIFE.
- * Support falsy and `null` super classes.
- * Add support for experimental abstract references `private` declarations.
- * Leave out IIFE for class declarations.
- * Switched to [core-js](https://github.com/zloirock/core-js) from [es6-symbol](https://github.com/medikoo/es6-symbol) and [es6-shim](https://github.com/paulmillr/es6-shim/) for built-in polyfill.
- * `amd` and `umd` module formatters now behave the same as `common` with `interopRequire`.
- * Micro-optimizations to boost performance by 200%.
- * Rename module formatter methods `import` to `importDeclaration` and `export` to `exportDeclaration`.
- * Support multiple declarators in export variable declarations.
- * Freeze tagged template literal object.
- * Remove inlined `regenerator` fork.
- * Remove `ParenthesizedExpression`.
- * Rename `object-spread` helper to `object-without-properties`.
- * Rename `class-props` helper to `prototype-properties`.
- * Rename `extends` helper to `inherits`.
- * Completely rewritten `system` module formatter.
-
-## 1.15.0
-
- * Don't alias `GeneratorFunction` and check the name which causes minifiers to remove the name and throw an error later on when we check if it's set.
-
-## 1.14.18
-
- * Fix files only containg comments not being output.
- * Fix duplicate comments on property key shorthands.
-
-## 1.14.17
-
- * Add default initializer to let variables within loop bodies.
- * Fix excessive `break` replacement inside of switches in let scoping.
-
-## 1.14.16
-
- * Add object getter memos and this shorthand to playground.
- * Fix while loops in let scoping.
- * Upgrade `acorn-6to5`.
-
-## 1.14.14
-
- * Fix template literals escaping.
-
-## 1.14.13
-
- * Fix let scoping of `while` loops.
- * Make class methods enumerable.
-
-## 1.14.12
-
- * Fix duplicate dynamic expressions in call spread.
-
-## 1.14.10
-
- * Fix let scoping unneccesary override.
-
-## 1.14.6
-
- * Avoid ensuring a block on non-array node replacements.
-
-## 1.14.5
-
- * Upgrade `acorn-6to5`.
- * Fix JSON recursion error for unknown code generator node types.
- * Ensure that a statement is a block on block/statement types when replacing them with multiple nodes.
-
-## 1.14.4
-
- * Merge pretzel maps and method binding.
-
-## 1.14.3
-
- * Add playground pretzel maps.
-
-## 1.14.2
-
- * Fix `commonInterop` default export handling.
- * Fix keyworded property key identifiers being turned into computed property key literals.
-
-## 1.14.1
-
- * Inherit comments from `ClassDeclaration`.
-
-## 1.14.0
-
- * Add [playground](https://6to5.github.io/playground.html).
-
-## 1.13.13
-
- * Fix `--debug` in `bin/6to5-node`. Thanks [@timoxley](https://github.com/timoxley).
-
-## 1.13.12
-
- * Ignore `XJSEmptyExpression`s in `react` transformer output.
-
-## 1.13.11
-
- * Fix `util.regexify` on falsy values.
- * Fix `_aliasFunction` with rest parameters.
- * Export as `module.exports` instead of `exports.default` if there are no other `ExportDeclaration`s in `commonInterop` module formatter.
- * Add `system` module formatter. Thanks [@douglasduteil](https://github.com/douglasduteil).
-
-## 1.13.10
-
- * Add support for `AssignmentExpression` destructuring outside of `ExpressionStatement`.
-
-## 1.13.9
-
- * Fix `VirtualPropertyExpression` visitor keys.
-
-## 1.13.8
-
- * Only use a single reference in abstract references.
-
-## 1.13.7
-
- * Upgrade `acorn-6to5`.
- * Add experimental exponentiation operator support.
-
-## 1.13.6
-
- * Fix experimental object spread/rest helper.
-
-## 1.13.5
-
- * Upgrade `acorn-6to5`.
- * Add experimental support for object spread/rest.
- * Change `arguments` to array to an additional helper method.
-
-## 1.13.4
-
- * Fix single spread element returning itself.
-
-## 1.13.3
-
- * Upgrade `acorn-6to5`.
- * Add experimental support for abstract references.
-
-## 1.13.2
-
- * Optimise `Array.from` usage by adding a helper method.
- * Upgrade `acorn-6to5`.
-
-## 1.13.1
-
- * Fix constructor spread optimisation. Thanks [@zloirock](https://github.com/zloirock).
-
-## 1.13.0
-
- * Put experimental ES7 features behind a flag `--experimental` and `experimental` option.
- * Constructor spread performance increase. Thanks [@RReverser](https://github.com/RReverser).
- * Use `self` instead of `window` in the optional 6to5 runtime. Thanks [@RReverser](https://github.com/RReverser).
-
-## 1.12.26
-
- * Support computed property destructuring.
-
-## 1.12.25
-
- * Update `acorn-6to5`, `ast-types`, `es6-shim`, `chokidar`, `estraverse` and `private`.
-
-## 1.12.24
-
- * Collect references that haven't been declared in scope.
-
-## 1.12.23
-
- * Fix generator function export hoisting.
-
-## 1.12.22
-
- * Update `fs-readdir-recursive` and `chokidar`.
- * Support array destructuring on iterables.
- * Make amd module id optional. Thanks [@webpro](https://github.com/webpro).
-
-## 1.12.21
-
- * Fix unneccesary let scoping replacement.
- * Add `commonInterop` module formatter. Thanks [@Naddiseo](https://github.com/Naddiseo).
- * Fix `return` outside of function body bug. Thanks [@brentburg](https://github.com/brentburg).
- * Add more flexible option types.
-
-## 1.12.20
-
- * Append `sourceMappingURL` when using `bin/6to5` and output sourcemaps.
-
-## 1.12.19
-
- * Add `comments` option and `--remove-comments` flag. Thanks [@webpro](htps://github.com/webpro).
- * Embed `regenerator`.
-
-## 1.12.18
-
- * Use `global` reference instead of `window`.
-
-## 1.12.17
-
- * Add `moduleName`, `sourceRoot` and `filenameRelative` options. Thanks [@darvelo](https://github.com/darvelo).
- * Traversal optimisations.
-
-## 1.12.16
-
- * Fix comments not being retained from `MethodDefinition` in classes.
- * Add temporal dead zone in default parameters.
-
-## 1.12.15
-
- * Update `acorn-6to5`.
-
-## 1.12.14
-
- * Fix duplicate let scoping in functions.
- * Make JSX whitespace more React-compliant.
- * Add `_memberExpressionKeywords` transformer that turns keyword identifiers to computed literals.
- * Upgrade `regenerator-6to5`.
-
-## 1.12.13
-
- * Support duplicate constants within different block scopes.
- * Fix for-head duplication testing and replacement.
- * Support `raw` property on tagged template literals.
-
-## 1.12.12
-
- * Make scope tracker more reliable to handle all edgecases.
-
-## 1.12.11
-
- * Block scope classes.
- * Fix generation of integer `Literal`s in `MemberExpression`.
-
-## 1.12.10
-
- * Fix let scoping var hoisting.
-
-## 1.12.9
-
- * Escape unicode characters when generating string `Literal`s.
- * Fix semicolons being output for statements in `ExportDeclaration`.
- * Fix `WithStatement` missing parenthesis.
-
-## 1.12.8
-
- * Temporarily forbid `AssignmentExpression` destructuring outside of `ExpressionStatement`.
-
-## 1.12.7
-
- * Update to latest `acorn-6to5`.
-
-## 1.12.6
-
- * Update to latest `acorn-6to5`.
-
-## 1.12.5
-
- * Fix excessive whitespace trimming resulting in innaccurate sourcemap line.
-
-## 1.12.4
-
- * Add `doc` folder for documentation.
-
-## 1.12.3
-
- * Support generator comprehensions.
- * Use `Array.from` instead of `Array.prototype.slice` in spread transformer.
- * Support spread in `NewExpression`s.
-
-## 1.12.2
-
- * Upgrade `matcha` to `0.6.0` and `browserify` to `6.3.2`.
- * Add own `trimRight` helper instead of relying on the string instance method.
- * Support JSX spreads that aren't the first.
-
-## 1.12.1
-
- * Fix `this` and `arguments` mapping in the `_aliasFunctions` transformer.
-
-## 1.12.0
-
- * Combine `jsx` and `react` transformers to `react`.
- * Update `react` syntax output to React v0.12.
-
-## 1.11.15
-
- * Fix JSX literal whitespace generation.
-
-## 1.11.14
-
- * Avoid using a switch for let-scoping continue and break statements and use an if statement instead.
- * Remove excess whitespace and newlines from JSX literals.
-
-## 1.11.13
-
- * Update regenerator-6to5
- * Add support for most escodegen formatting options
+ * 6to5 is now known as Babel.
+ * Global helpers/runtime has now been given the more descriptive name of "external helpers".

CONTRIBUTING.md

@@ -1,18 +1,25 @@
 # Contributing
 
-Contributions are always welcome, no matter how large or small. Before contributing, please read the [code of conduct](https://github.com/6to5/6to5/blob/master/CODE_OF_CONDUCT.md).
+Contributions are always welcome, no matter how large or small. Before
+contributing, please read the
+[code of conduct](https://github.com/babel/babel/blob/master/CODE_OF_CONDUCT.md).
+
+**NOTE:** Please do not send pull requests that fix linting issues. It's highly
+likely that they've already been fixed by the time it's submitted and it just
+pollutes the git tree.
 
 ## Developing
 
 #### Workflow
 
 * Fork the repository
-* Clone your fork and change directory to it (`git clone git@github.com:yourUserName/6to5.git && cd 6to5`)
+* Clone your fork and change directory to it (`git clone git@github.com:yourUserName/babel.git && cd babel`)
 * Install the project dependencies (`make bootstrap`)
 * Link your forked clone (`npm link`)
 * Develop your changes ensuring you're fetching updates from upstream often
 * Ensure the test are passing (`make test`)
-* Create new pull request explaining your proposed change or reference an issue in your commit message
+* Create new pull request explaining your proposed change or reference an issue
+  in your commit message
 
 #### Code Standards
 

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2014-2015 Sebastian McKenzie
+Copyright (c) 2014-2015 Sebastian McKenzie <sebmck@gmail.com>
 
 MIT License
 

Makefile

@@ -5,21 +5,31 @@ UGLIFY_CMD = node_modules/uglify-js/bin/uglifyjs
 JSHINT_CMD = node_modules/jshint/bin/jshint
 MOCHA_CMD = node_modules/mocha/bin/_mocha
 JSCS_CMD = node_modules/jscs/bin/jscs
+BABEL_CMD = node_modules/babel/bin/babel
 
 export NODE_ENV = test
 
-.PHONY: clean test test-cov test-clean lint test-travis test-simple test-all test-browser publish build bootstrap publish-core publish-runtime
+.PHONY: clean test test-cov test-clean lint test-travis test-simple test-all test-browser publish build bootstrap publish-core publish-runtime build-core watch-core
+
+build-core:
+	#node $(BABEL_CMD) src --out-dir lib
+
+watch-core:
+	#node $(BABEL_CMD) src --out-dir lib --watch
 
 build:
 	mkdir -p dist
 
 	node tools/cache-templates
 
-	node $(BROWSERIFY_CMD) -e lib/6to5/polyfill.js >dist/polyfill.js
+	node $(BROWSERIFY_CMD) -e lib/babel/polyfill.js >dist/polyfill.js
 	node $(UGLIFY_CMD) dist/polyfill.js >dist/polyfill.min.js
 
-	node $(BROWSERIFY_CMD) lib/6to5/browser.js -s to5 >dist/6to5.js
-	node $(UGLIFY_CMD) dist/6to5.js >dist/6to5.min.js
+	node $(BROWSERIFY_CMD) lib/babel/api/browser.js -s babel >dist/babel.js
+	node $(UGLIFY_CMD) dist/babel.js >dist/babel.min.js
+
+	node bin/babel-external-helpers >dist/external-helpers.js
+	node $(UGLIFY_CMD) dist/external-helpers.js >dist/external-helpers.min.js
 
 	rm -rf templates.json
 
@@ -39,20 +49,19 @@ test: lint
 
 test-simple:
 	# excludes test262
-	export SIMPLE_6TO5_TESTS=1; \
+	export SIMPLE_BABEL_TESTS=1; \
 	make test
 
 test-all:
-	# includes traceur, esnext, regenerator
-	export ALL_6TO5_TESTS=1; \
+	export ALL_BABEL_TESTS=1; \
 	make test
 
 test-cov:
 	rm -rf coverage
-	export SIMPLE_6TO5_TESTS=1; \
+	export SIMPLE_BABEL_TESTS=1; \
 	node $(ISTANBUL_CMD) $(MOCHA_CMD) --
 
-test-travis: bootstrap
+test-travis: build-core bootstrap
 	node $(ISTANBUL_CMD) $(MOCHA_CMD) --
 	if test -n "$$CODECLIMATE_REPO_TOKEN"; then codeclimate < coverage/lcov.info; fi
 
@@ -61,7 +70,7 @@ test-browser:
 
 	node tools/cache-templates
 	node tools/cache-tests
-	node $(BROWSERIFY_CMD) -e test/_browser.js >dist/6to5-test.js
+	node $(BROWSERIFY_CMD) -e test/_browser.js >dist/babel-test.js
 	rm -rf templates.json tests.json
 
 	test -n "`which open`" && open test/browser.html
@@ -75,8 +84,9 @@ publish:
 	npm version $$version --message "v%s"
 
 	make build
-	cp dist/6to5.min.js browser.js
+	cp dist/babel.min.js browser.js
 	cp dist/polyfill.min.js browser-polyfill.js
+	cp dist/external-helpers.min.js external-helpers.js
 
 	node tools/cache-templates
 	test -f templates.json
@@ -88,12 +98,12 @@ publish:
 	make publish-core
 	make publish-runtime
 
-	rm -rf templates.json browser.js browser-polyfill.js
+	rm -rf templates.json browser.js browser-polyfill.js external-helpers.js
 
 publish-runtime:
 	cd packages; \
 	node build-runtime.js; \
-	cd 6to5-runtime; \
+	cd babel-runtime; \
 	npm publish
 
 publish-core:
@@ -110,3 +120,4 @@ bootstrap:
 	npm install
 	git submodule update --init
 	cd vendor/regenerator; npm install
+	cd vendor/compat-table; npm install object-assign

NOTES.md

@@ -1,3 +0,0 @@
-# Notes
-
- * Wildcard exports/imports wont normalise if `export default` is a non-object. See [#224](https://github.com/6to5/6to5/issues/224).

README.md

@@ -1,12 +1,18 @@
 <p align="center">
-  <img alt="6to5" src="https://raw.githubusercontent.com/6to5/logo/master/logo.png" width="546">
+  <a href="https://babeljs.io/">
+    <img alt="babel" src="https://raw.githubusercontent.com/babel/logo/master/logo.png" width="546">
+  </a>
 </p>
 
 <p align="center">
-  <strong>6to5</strong> turns ES6+ code into vanilla ES5, so you can use next generation features <strong>today.</strong>
+  <strong>Babel</strong> is a transpiler for writing next generation JavaScript.
 </p>
 
 <p align="center">
-  For more information view the <a href="https://6to5.github.io">documentation</a>. For
-  support visit the <a href="https://gitter.im/6to5/6to5">gitter room</a>.
+  For more information view the <a href="https://babeljs.io/">documentation</a>. For
+  support visit the <a href="https://gitter.im/babel/babel">gitter room</a>.
+</p>
+
+<p align="center">
+  For documentation and website issues please visit the <a href="https://github.com/babel/babel.github.io">babel.github.io</a> repo.
 </p>

appveyor.yml

@@ -1,17 +0,0 @@
-environment:
-  matrix:
-    - nodejs_version: "0.10"
-    - nodejs_version: "0.11"
-
-install:
- - "npm install"
- - "cinst make"
-
-test_script:
- - "node --version"
- - "npm --version"
- - "make test-spec"
-
-build: "off"
-
-version: "{build}"

bin/_babel-node

@@ -1,15 +1,16 @@
 #!/usr/bin/env node
 
-var commander = require("commander");
-var Module    = require("module");
-var path      = require("path");
-var repl      = require("repl");
-var to5       = require("../lib/6to5");
-var util      = require("../lib/6to5/util");
-var vm        = require("vm");
-var _         = require("lodash");
+var pathIsAbsolute = require("path-is-absolute");
+var commander      = require("commander");
+var Module         = require("module");
+var babel          = require("../lib/babel/api/node");
+var path           = require("path");
+var repl           = require("repl");
+var util           = require("../lib/babel/util");
+var vm             = require("vm");
+var _              = require("lodash");
 
-var program = new commander.Command("6to5-node");
+var program = new commander.Command("babel-node");
 
 program.option("-e, --eval [script]", "Evaluate script");
 program.option("-p, --print [code]", "Evaluate script and print result");
@@ -19,6 +20,7 @@ program.option("-r, --experimental", "Enable experimental support for proposed E
 program.option("-g, --playground", "Enable playground support");
 program.option("-w, --whitelist [whitelist]", "Whitelist of transformers to ONLY use", util.list);
 program.option("-b, --blacklist [blacklist]", "Blacklist of transformers to NOT use", util.list);
+program.option("-o, --optional [optional]", "List of optional transformers to enable", util.list);
 
 var pkg = require("../package.json");
 program.version(pkg.version);
@@ -27,22 +29,24 @@ program.parse(process.argv);
 
 //
 
-to5.register({
+babel.register({
   experimental: program.experimental,
   extensions:   program.extensions,
   playground:   program.playground,
   blacklist:    program.blacklist,
   whitelist:    program.whitelist,
+  optional:     program.optional,
   ignore:       program.ignore
 });
 
 //
 
 var _eval = function (code, filename) {
-  code = to5.transform(code, {
+  code = babel.transform(code, {
     filename: filename,
     blacklist: ["useStrict"].concat(program.blacklist || []),
     whitelist: program.whitelist,
+    optional: program.optional,
     experimental: program.experimental,
     playground: program.playground
   }).code;
@@ -57,12 +61,23 @@ if (program.eval || program.print) {
   if (program.print) console.log(result);
 } else {
   if (program.args.length) {
-    // slice all arguments up to the first filename since they're 6to5 args that we handle
+    // slice all arguments up to the first filename since they're babel args that we handle
     var args = process.argv.slice(2);
 
     var i = 0;
+    var ignoreNext = false;
     _.each(args, function (arg, i2) {
-      if (arg[0] !== "-") {
+      if (ignoreNext) {
+        ignoreNext = false;
+        return;
+      }
+
+      if (arg[0] === "-") {
+        var parsedArg = program[arg.slice(2)];
+        if (parsedArg && parsedArg !== true) {
+          ignoreNext = true;
+        }
+      } else {
         i = i2;
         return false;
       }
@@ -71,7 +86,7 @@ if (program.eval || program.print) {
 
     // make the filename absolute
     var filename = args[0]
-    if (!util.isAbsolute(filename)) args[0] = path.join(process.cwd(), filename);
+    if (!pathIsAbsolute(filename)) args[0] = path.join(process.cwd(), filename);
 
     // add back on node and concat the sliced args
     process.argv = ["node"].concat(args);

bin/babel-external-helpers

@@ -0,0 +1,4 @@
+#!/usr/bin/env node
+
+var runtime = require("../lib/babel/build-external-helpers");
+console.log(runtime());

bin/babel-node

@@ -2,10 +2,10 @@
 
 /**
  * This tiny wrapper file checks for known node flags and appends them
- * when found, before invoking the "real" _6to5-node(1) executable.
+ * when found, before invoking the "real" _babel-node(1) executable.
  */
 
-var args  = ["--harmony", __dirname + "/_6to5-node"];
+var args  = [__dirname + "/_babel-node"];
 
 process.argv.slice(2).forEach(function(arg){
   var flag = arg.split("=")[0];
@@ -35,6 +35,7 @@ process.argv.slice(2).forEach(function(arg){
     case "--prof":
     case "--throw-deprecation":
     case "--trace-deprecation":
+    case "--use-strict":
       args.unshift(arg);
       break;
 

bin/babel/dir.js

@@ -11,9 +11,14 @@ module.exports = function (commander, filenames, opts) {
   }
 
   var write = function (src, relative) {
+    // remove extension and then append back on .js
+    relative = relative.replace(/\.(\w*?)$/, "") + ".js";
+
     var dest = path.join(commander.outDir, relative);
 
-    var data = util.compile(src, { sourceMapName: dest });
+    var data = util.compile(src, {
+      sourceFileName: path.relative(dest + "/..", src)
+    });
 
     if (commander.sourceMaps) {
       var mapLoc = dest + ".map";
@@ -34,8 +39,13 @@ module.exports = function (commander, filenames, opts) {
     if (stat.isDirectory(filename)) {
       var dirname = filename;
 
-      _.each(util.readdirFilter(dirname), function (filename) {
-        write(path.join(dirname, filename), filename);
+      _.each(util.readdir(dirname), function (filename) {
+        var src = path.join(dirname, filename);
+        if (util.canCompile(filename)) {
+          write(src, filename);
+        } else {
+          outputFileSync(path.join(commander.outDir, filename), fs.readFileSync(src));
+        }
       });
     } else {
       write(filename, filename);
@@ -53,10 +63,7 @@ module.exports = function (commander, filenames, opts) {
 
       _.each(["add", "change"], function (type) {
         watcher.on(type, function (filename) {
-          // chop off the dirname plus the path separator
-          var relative = filename.slice(dirname.length + 1);
-
-          console.log(type, filename);
+          var relative = path.relative(dirname, filename) || filename;
           write(filename, relative);
         });
       });

bin/babel/file.js

@@ -1,10 +1,10 @@
-var sourceMap = require("source-map");
-var chokidar  = require("chokidar");
-var util2     = require("../../lib/6to5/util");
-var path      = require("path");
-var util      = require("./util");
-var fs        = require("fs");
-var _         = require("lodash");
+var sourceMapToComment = require("source-map-to-comment");
+var sourceMap          = require("source-map");
+var chokidar           = require("chokidar");
+var path               = require("path");
+var util               = require("./util");
+var fs                 = require("fs");
+var _                  = require("lodash");
 
 module.exports = function (commander, filenames) {
   var results = [];
@@ -42,7 +42,7 @@ module.exports = function (commander, filenames) {
     });
 
     if (commander.sourceMapsInline || (!commander.outFile && commander.sourceMaps)) {
-      code += "\n" + util2.sourceMapToComment(map);
+      code += "\n" + sourceMapToComment(map);
     }
 
     return {

bin/babel/index.js

@@ -1,18 +1,21 @@
 #!/usr/bin/env node
 
 var commander = require("commander");
-var transform = require("../../lib/6to5/transformation/transform");
-var util      = require("../../lib/6to5/util");
+var transform = require("../../lib/babel/transformation");
+var util      = require("../../lib/babel/util");
 var fs        = require("fs");
-var _         = require("lodash");
+var each      = require("lodash/collection/each");
+var keys      = require("lodash/object/keys");
 
 commander.option("-t, --source-maps-inline", "Append sourceMappingURL comment to bottom of code");
 commander.option("-s, --source-maps", "Save source map alongside the compiled code");
 commander.option("-f, --filename [filename]", "Filename to use when reading from stdin - this will be used in source-maps, errors etc [stdin]", "stdin");
 commander.option("-w, --watch", "Recompile files on changes");
+commander.option("-r, --external-helpers", "Replace helpers with references to a `babelHelpers` global");
 commander.option("-e, --experimental", "Enable experimental support for proposed ES7 features");
 commander.option("-p, --playground", "Enable playground support");
 
+commander.option("-c, --compact [mode]", "When set to \"auto\" compact is `true` when the input size exceeds 100KB. (auto|true|false)", "auto");
 commander.option("-m, --modules [modules]", "Module formatter type to use [common]", "common");
 commander.option("-l, --whitelist [whitelist]", "Whitelist of transformers to ONLY use", util.list);
 commander.option("-b, --blacklist [blacklist]", "Blacklist of transformers to NOT use", util.list);
@@ -21,16 +24,17 @@ commander.option("-L, --loose [list]", "List of transformers to enable loose mod
 commander.option("-o, --out-file [out]", "Compile all input files into a single file");
 commander.option("-d, --out-dir [out]", "Compile an input directory of modules into an output directory");
 commander.option("-c, --remove-comments", "Remove comments from the compiled code", false);
-commander.option("-m, --module-ids", "Insert module id in modules", false);
+commander.option("-M, --module-ids", "Insert module id in modules", false);
 commander.option("-R, --react-compat", "Makes the react transformer produce pre-v0.12 code");
 commander.option("--keep-module-id-extensions", "Keep extensions when generating module ids", false);
+commander.option("-a, --auxiliary-comment [comment]", "Comment text to prepend to all auxiliary code");
 
 commander.on("--help", function () {
   var outKeys = function (title, obj) {
     console.log("  " + title + ":");
     console.log();
 
-    _.each(_.keys(obj).sort(), function (key) {
+    each(keys(obj).sort(), function (key) {
       if (key[0] === "_") return;
 
       if (obj[key].optional) {
@@ -58,7 +62,7 @@ var errors = [];
 
 var filenames = commander.args;
 
-_.each(filenames, function (filename) {
+each(filenames, function (filename) {
   if (!fs.existsSync(filename)) {
     errors.push(filename + " doesn't exist");
   }
@@ -97,6 +101,8 @@ if (errors.length) {
 
 exports.opts = {
   keepModuleIdExtensions: commander.keepModuleIdExtensions,
+  auxiliaryComment:       commander.auxiliaryComment,
+  externalHelpers:        commander.externalHelpers,
   sourceMapName:          commander.outFile,
   experimental:           commander.experimental,
   reactCompat:            commander.reactCompat,
@@ -108,6 +114,7 @@ exports.opts = {
   optional:               commander.optional,
   comments:               !commander.removeComments,
   modules:                commander.modules,
+  compact:                commander.compact,
   loose:                  commander.loose
 };
 

bin/babel/util.js

@@ -1,8 +1,8 @@
 var readdir = require("fs-readdir-recursive");
 var index   = require("./index");
-var util    = require("../../lib/6to5/util");
+var babel   = require("../../lib/babel/api/node");
+var util    = require("../../lib/babel/util");
 var path    = require("path");
-var to5     = require("../../lib/6to5");
 var fs      = require("fs");
 var _       = require("lodash");
 
@@ -12,17 +12,21 @@ exports.readdirFilter = function (filename) {
   });
 };
 
+exports.readdir = readdir;
+
+exports.canCompile = util.canCompile;
+
 exports.addSourceMappingUrl = function (code, loc) {
   return code + "\n//# sourceMappingURL=" + path.basename(loc);
 };
 
 exports.transform = function (filename, code, opts) {
-  opts = _.extend(opts || {}, index.opts);
+  opts = _.defaults(opts || {}, index.opts);
   opts.filename = filename;
 
   var result;
   try {
-    result = to5.transform(code, opts);
+    result = babel.transform(code, opts);
   } catch (e) {
     if (e instanceof SyntaxError) {
       console.error("SyntaxError:", e.message);

bin/deprecated/6to5

@@ -0,0 +1,3 @@
+#!/usr/bin/env node
+console.error("`6to5` has been renamed to `babel`");
+require("../babel");

bin/deprecated/6to5-node

@@ -0,0 +1,3 @@
+#!/usr/bin/env node
+console.error("`6to5-node` has been renamed to `babel-node`");
+require("../_babel-node");

bin/deprecated/6to5-runtime

@@ -0,0 +1,3 @@
+#!/usr/bin/env node
+console.error("`6to5-runtime` has been renamed to `babel-external-helpers`");
+require("../babel-external-helpers");

doc/index.md

@@ -1 +1 @@
-See [6to5.github.io/docs](https://github.com/6to5/6to5.github.io/tree/master/docs).
+See [babel.github.io/docs](https://github.com/babel/babel.github.io/tree/master/docs).

lib/6to5/generation/node/whitespace.js

@@ -1,78 +0,0 @@
-"use strict";
-
-var _ = require("lodash");
-var t = require("../../types");
-
-exports.before = {
-  nodes: {
-    Property: function (node, parent) {
-      if (parent.properties[0] === node) {
-        return 1;
-      }
-    },
-
-    SpreadProperty: function (node, parent) {
-      return exports.before.nodes.Property(node, parent);
-    },
-
-    SwitchCase: function (node, parent) {
-      if (parent.cases[0] === node) {
-        return 1;
-      }
-    },
-
-    CallExpression: function (node) {
-      if (t.isFunction(node.callee)) {
-        return 1;
-      }
-    }
-  }
-};
-
-exports.after = {
-  nodes: {
-    AssignmentExpression: function (node) {
-      if (t.isFunction(node.right)) {
-        return 1;
-      }
-    }
-  },
-
-  list: {
-    VariableDeclaration: function (node) {
-      return _.map(node.declarations, "init");
-    },
-
-    ArrayExpression: function (node) {
-      return node.elements;
-    },
-
-    ObjectExpression: function (node) {
-      return node.properties;
-    }
-  }
-};
-
-_.each({
-  Function: 1,
-  Class: 1,
-  For: 1,
-  ArrayExpression: { after: 1 },
-  ObjectExpression: { after: 1 },
-  SwitchStatement: 1,
-  IfStatement: { before: 1 },
-  CallExpression: { after: 1 },
-  Literal: { after: 1 }
-}, function (amounts, type) {
-  if (_.isNumber(amounts)) {
-    amounts = { after: amounts, before: amounts };
-  }
-
-  _.each([type].concat(t.FLIPPED_ALIAS_KEYS[type] || []), function (type) {
-    _.each(amounts, function (amount, key) {
-      exports[key].nodes[type] = function () {
-        return amount;
-      };
-    });
-  });
-});

lib/6to5/helpers/clone.js

@@ -1,12 +0,0 @@
-"use strict";
-
-module.exports = function cloneDeep(obj) {
-  var obj2 = {};
-  if (!obj) return obj2;
-
-  for (var key in obj) {
-    obj2[key] = obj[key];
-  }
-
-  return obj2;
-};

lib/6to5/polyfill.js

@@ -1,9 +0,0 @@
-"use strict";
-
-if (global._6to5Polyfill) {
-  throw new Error("only one instance of 6to5/polyfill is allowed");
-}
-global._6to5Polyfill = true;
-
-require("core-js/shim");
-require("regenerator-6to5/runtime");

lib/6to5/register-browser.js

@@ -1,7 +0,0 @@
-"use strict";
-
-// required to safely use 6to5/register within a browserify codebase
-
-module.exports = function () {};
-
-require("./polyfill");

lib/6to5/register.js

@@ -1,107 +0,0 @@
-"use strict";
-
-require("./polyfill");
-
-var sourceMapSupport = require("source-map-support");
-var registerCache    = require("./register-cache");
-var util             = require("./util");
-var to5              = require("./index");
-var fs               = require("fs");
-var _                = require("lodash");
-
-sourceMapSupport.install({
-  retrieveSourceMap: function (source) {
-    var map = maps && maps[source];
-    if (map) {
-      return {
-        url: null,
-        map: map
-      };
-    } else {
-      return null;
-    }
-  }
-});
-
-//
-
-registerCache.load();
-var cache = registerCache.get();
-
-//
-
-var transformOpts = {};
-var ignoreRegex   = /node_modules/;
-var onlyRegex;
-var whitelist     = [];
-var exts          = {};
-var maps          = {};
-var old           = require.extensions[".js"];
-
-var mtime = function (filename) {
-  return +fs.statSync(filename).mtime;
-};
-
-var loader = function (m, filename) {
-  if ((ignoreRegex && ignoreRegex.test(filename)) || (onlyRegex && !onlyRegex.test(filename))) {
-    return old.apply(this, arguments);
-  }
-
-  var result;
-
-  if (cache) {
-    var cached = cache[filename];
-    if (cached && cached.mtime === mtime(filename)) {
-      result = cached;
-    }
-  }
-
-  result = result || to5.transformFileSync(filename, _.extend({
-    whitelist: whitelist,
-    sourceMap: true,
-    ast:       false
-  }, transformOpts));
-
-  if (cache) {
-    result.mtime = mtime(filename);
-    cache[filename] = result;
-  }
-
-  maps[filename] = result.map;
-
-  m._compile(result.code, filename);
-};
-
-var hookExtensions = function (_exts) {
-  _.each(exts, function (old, ext) {
-    require.extensions[ext] = old;
-  });
-
-  exts = {};
-
-  _.each(_exts, function (ext) {
-    exts[ext] = require.extensions[ext];
-    require.extensions[ext] = loader;
-  });
-};
-
-hookExtensions(util.canCompile.EXTENSIONS);
-
-module.exports = function (opts) {
-  // normalise options
-  opts = opts || {};
-
-  if (opts.only != null) onlyRegex = util.regexify(opts.only);
-  if (opts.ignore != null) ignoreRegex = util.regexify(opts.ignore);
-
-  if (opts.extensions) hookExtensions(util.arrayify(opts.extensions));
-
-  if (opts.cache === false) cache = null;
-
-  delete opts.extensions;
-  delete opts.ignore;
-  delete opts.cache;
-  delete opts.only;
-
-  _.extend(transformOpts, opts);
-};

lib/6to5/transformation/helpers/use-strict.js

@@ -1,21 +0,0 @@
-"use strict";
-
-var t = require("../../types");
-
-exports.has = function (node) {
-  var first = node.body[0];
-  return t.isExpressionStatement(first) && t.isLiteral(first.expression, { value: "use strict" });
-};
-
-exports.wrap = function (node, callback) {
-  var useStrictNode;
-  if (exports.has(node)) {
-    useStrictNode = node.body.shift();
-  }
-
-  callback();
-
-  if (useStrictNode) {
-    node.body.unshift(useStrictNode);
-  }
-};

lib/6to5/transformation/templates/class-super-constructor-call.js

@@ -1,3 +0,0 @@
-if (Object.getPrototypeOf(CLASS_NAME) !== null) {
-  Object.getPrototypeOf(CLASS_NAME).apply(this, arguments);
-}

lib/6to5/transformation/templates/default-parameter.js

@@ -1 +0,0 @@
-var VARIABLE_NAME = ARGUMENTS[ARGUMENT_KEY] === undefined ? DEFAULT_VALUE : ARGUMENTS[ARGUMENT_KEY];

lib/6to5/transformation/templates/defaults.js

@@ -1,8 +0,0 @@
-(function (obj, defaults) {
-  for (var key in defaults) {
-    if (obj[key] === undefined) {
-      obj[key] = defaults[key];
-    }
-  }
-  return obj;
-})

lib/6to5/transformation/transformer-pass.js

@@ -1,69 +0,0 @@
-module.exports = TransformerPass;
-
-var traverse = require("../traverse");
-var _        = require("lodash");
-
-/**
- * This class is responsible for traversing over the provided `File`s
- * AST and running it's parent transformers handlers over it.
- */
-
-function TransformerPass(file, transformer) {
-  this.transformer = transformer;
-  this.handlers    = transformer.handlers;
-  this.file        = file;
-}
-
-TransformerPass.prototype.astRun = function (key) {
-  var handlers = this.handlers;
-  var file = this.file;
-
-  if (handlers.ast && handlers.ast[key]) {
-    handlers.ast[key](file.ast, file);
-  }
-};
-
-TransformerPass.prototype.canRun = function () {
-  var transformer = this.transformer;
-
-  var opts = this.file.opts;
-  var key  = transformer.key;
-  if (key[0] === "_") return true;
-
-  var blacklist = opts.blacklist;
-  if (blacklist.length && _.contains(blacklist, key)) return false;
-
-  var whitelist = opts.whitelist;
-  if (whitelist.length && !_.contains(whitelist, key)) return false;
-
-  if (transformer.optional && !_.contains(opts.optional, key)) return false;
-
-  if (transformer.experimental && !opts.experimental) return false;
-
-  return true;
-};
-
-var transformVisitor = {
-  enter: function (node, parent, scope, context, state) {
-    var fns = state.handlers[node.type];
-    if (!fns) return;
-    return fns.enter(node, parent, scope, context, state.file, state.pass);
-  },
-
-  exit: function (node, parent, scope, context, state) {
-    var fns = state.handlers[node.type];
-    if (!fns) return;
-    return fns.exit(node, parent, scope, context, state.file, state.pass);
-  }
-};
-
-TransformerPass.prototype.transform = function () {
-  var file = this.file;
-
-  this.astRun("before");
-
-  var state = { file: file, handlers: this.handlers, pass: this };
-  traverse(file.ast, transformVisitor, file.scope, state);
-
-  this.astRun("after");
-};

lib/6to5/transformation/transformer.js

@@ -1,61 +0,0 @@
-"use strict";
-
-module.exports = Transformer;
-
-var TransformerPass = require("./transformer-pass");
-var t               = require("../types");
-var _               = require("lodash");
-
-/**
- * This is the class responsible for normalising a transformers handlers
- * as well as constructing a `TransformerPass` that is repsonsible for
- * actually running the transformer over the provided `File`.
- */
-
-function Transformer(key, transformer, opts) {
-  this.manipulateOptions = transformer.manipulateOptions;
-  this.experimental      = !!transformer.experimental;
-  this.secondPass        = !!transformer.secondPass;
-  this.optional          = !!transformer.optional;
-  this.handlers          = this.normalise(transformer);
-  this.opts              = opts || {};
-  this.key               = key;
-}
-
-Transformer.prototype.normalise = function (transformer) {
-  var self = this;
-
-  if (_.isFunction(transformer)) {
-    transformer = { ast: transformer };
-  }
-
-  _.each(transformer, function (fns, type) {
-    // hidden property
-    if (type[0] === "_") {
-      self[type] = fns;
-      return;
-    }
-
-    if (_.isFunction(fns)) fns = { enter: fns };
-
-    if (!_.isObject(fns)) return;
-
-    if (!fns.enter) fns.enter = _.noop;
-    if (!fns.exit) fns.exit = _.noop;
-
-    transformer[type] = fns;
-
-    var aliases = t.FLIPPED_ALIAS_KEYS[type];
-    if (aliases) {
-      _.each(aliases, function (alias) {
-        transformer[alias] = fns;
-      });
-    }
-  });
-
-  return transformer;
-};
-
-Transformer.prototype.buildPass = function (file) {
-  return new TransformerPass(file, this);
-};

lib/6to5/transformation/transformers/deprecated.json

@@ -1,38 +0,0 @@
-{
-  "specNoForInOfAssignment": "validation.noForInOfAssignment",
-  "specSetters": "validation.setters",
-  "specBlockScopedFunctions": "spec.blockScopedFunctions",
-  "malletOperator": "playground.malletOperator",
-  "methodBinding": "playground.methodBinding",
-  "memoizationOperator": "playground.memoizationOperator",
-  "objectGetterMemoization": "playground.objectGetterMemoization",
-  "modules": "es6.modules",
-  "propertyNameShorthand": "es6.properties.shorthand",
-  "arrayComprehension": "es7.comprehensions",
-  "generatorComprehension": "es7.comprehensions",
-  "arrowFunctions": "es6.arrowFunctions",
-  "classes": "es6.classes",
-  "objectSpread": "es7.objectSpread",
-  "exponentiationOperator": "es7.exponentiationOperator",
-  "spread": "es6.spread",
-  "templateLiterals": "es6.templateLiterals",
-  "propertyMethodAssignment": "es6.properties.shorthand",
-  "computedPropertyNames": "es6.properties.computed",
-  "defaultParameters": "es6.parameters.default",
-  "restParameters": "es6.parameters.rest",
-  "destructuring": "es6.destructuring",
-  "forOf": "es6.forOf",
-  "unicodeRegex": "es6.unicodeRegex",
-  "abstractReferences": "es7.abstractReferences",
-  "constants": "es6.constants",
-  "letScoping": "es6.letScoping",
-  "blockScopingTDZ": "es6.blockScopingTDZ",
-  "generators": "regenerator",
-  "protoToAssign": "spec.protoToAssign",
-  "typeofSymbol": "spec.typeofSymbol",
-  "coreAliasing": "selfContained",
-  "undefinedToVoid": "spec.undefinedToVoid",
-  "undeclaredVariableCheck": "validation.undeclaredVariableCheck",
-  "specPropertyLiterals": "minification.propertyLiterals",
-  "specMemberExpressionLiterals": "minification.memberExpressionLiterals"
-}

lib/6to5/transformation/transformers/es6/block-scoping-tdz.js

@@ -1,50 +0,0 @@
-"use strict";
-
-var traverse = require("../../../traverse");
-var t        = require("../../../types");
-
-var visitor = {
-  enter: function (node, parent, scope, context, state) {
-    if (!t.isReferencedIdentifier(node, parent)) return;
-
-    var declared = state.letRefs[node.name];
-    if (!declared) return;
-
-    // declared node is different in this scope
-    if (scope.get(node.name, true) !== declared) return;
-
-    var declaredLoc  = declared.loc;
-    var referenceLoc = node.loc;
-
-    if (!declaredLoc || !referenceLoc) return;
-
-    // does this reference appear on a line before the declaration?
-    var before = referenceLoc.start.line < declaredLoc.start.line;
-
-    if (referenceLoc.start.line === declaredLoc.start.line) {
-      // this reference appears on the same line
-      // check it appears before the declaration
-      before = referenceLoc.start.col < declaredLoc.start.col;
-    }
-
-    if (before) {
-      throw state.file.errorWithNode(node, "Temporal dead zone - accessing a variable before it's initialized");
-    }
-  }
-};
-
-exports.optional = true;
-
-exports.Loop =
-exports.Program =
-exports.BlockStatement = function (node, parent, scope, context, file) {
-  var letRefs = node._letReferences;
-  if (!letRefs) return;
-
-  var state = {
-    letRefs: letRefs,
-    file:    file
-  };
-
-  traverse(node, visitor, scope, state);
-};

lib/6to5/transformation/transformers/es6/constants.js

@@ -1,41 +0,0 @@
-"use strict";
-
-var traverse = require("../../../traverse");
-var t        = require("../../../types");
-
-var visitor = {
-  enter: function (node, parent, scope, context, state) {
-    if (t.isDeclaration(node) || t.isAssignmentExpression(node)) {
-      var ids = t.getIds(node, true);
-
-      for (var key in ids) {
-        var id = ids[key];
-
-        var constant = state.constants[key];
-
-        // no constant exists
-        if (!constant) continue;
-
-        // check if the assignment id matches the constant declaration id
-        // if it does then it was the id used to initially declare the
-        // constant so we can just ignore it
-        if (id === constant) continue;
-
-        throw state.file.errorWithNode(id, key + " is read-only");
-      }
-    } else if (t.isScope(node)) {
-      context.skip();
-    }
-  }
-};
-
-exports.Scope = function (node, parent, scope, context, file) {
-  traverse(node, visitor, scope, {
-    constants: scope.getAllOfKind("const"),
-    file:      file
-  });
-};
-
-exports.VariableDeclaration = function (node) {
-  if (node.kind === "const") node.kind = "let";
-};

lib/6to5/transformation/transformers/es6/destructuring.js

@@ -1,343 +0,0 @@
-"use strict";
-
-// TODO: Clean up
-
-var t = require("../../../types");
-
-var buildVariableAssign = function (opts, id, init) {
-  var op = opts.operator;
-  if (t.isMemberExpression(id)) op = "=";
-
-  var node;
-
-  if (op) {
-    node = t.expressionStatement(t.assignmentExpression(op, id, init));
-  } else {
-    node = t.variableDeclaration(opts.kind, [
-      t.variableDeclarator(id, init)
-    ]);
-  }
-
-  node._blockHoist = opts.blockHoist;
-
-  return node;
-};
-
-var buildVariableDeclar = function (opts, id, init) {
-  var declar = t.variableDeclaration("var", [
-    t.variableDeclarator(id, init)
-  ]);
-  declar._blockHoist = opts.blockHoist;
-  return declar;
-};
-
-var push = function (opts, nodes, elem, parentId) {
-  if (t.isObjectPattern(elem)) {
-    pushObjectPattern(opts, nodes, elem, parentId);
-  } else if (t.isArrayPattern(elem)) {
-    pushArrayPattern(opts, nodes, elem, parentId);
-  } else if (t.isAssignmentPattern(elem)) {
-    pushAssignmentPattern(opts, nodes, elem, parentId);
-  } else {
-    nodes.push(buildVariableAssign(opts, elem, parentId));
-  }
-};
-
-var pushAssignmentPattern = function (opts, nodes, pattern, parentId) {
-  var tempParentId = opts.scope.generateUidBasedOnNode(parentId, opts.file);
-
-  nodes.push(t.variableDeclaration("var", [
-    t.variableDeclarator(tempParentId, parentId)
-  ]));
-
-  nodes.push(buildVariableAssign(
-    opts,
-    pattern.left,
-    t.conditionalExpression(
-      t.binaryExpression("===", tempParentId, t.identifier("undefined")),
-      pattern.right,
-      tempParentId
-    )
-  ));
-};
-
-var pushObjectPattern = function (opts, nodes, pattern, parentId) {
-  for (var i = 0; i < pattern.properties.length; i++) {
-    var prop = pattern.properties[i];
-    if (t.isSpreadProperty(prop)) {
-      // get all the keys that appear in this object before the current spread
-      var keys = [];
-      for (var i2 = 0; i2 < pattern.properties.length; i2++) {
-        var prop2 = pattern.properties[i2];
-
-        if (i2 >= i) break;
-        if (t.isSpreadProperty(prop2)) continue;
-
-        var key = prop2.key;
-        if (t.isIdentifier(key)) {
-          key = t.literal(prop2.key.name);
-        }
-        keys.push(key);
-      }
-      keys = t.arrayExpression(keys);
-
-      var value = t.callExpression(opts.file.addHelper("object-without-properties"), [parentId, keys]);
-      nodes.push(buildVariableAssign(opts, prop.argument, value));
-    } else {
-      if (t.isLiteral(prop.key)) prop.computed = true;
-
-      var pattern2   = prop.value;
-      var patternId2 = t.memberExpression(parentId, prop.key, prop.computed);
-
-      if (t.isPattern(pattern2)) {
-        push(opts, nodes, pattern2, patternId2);
-      } else {
-        nodes.push(buildVariableAssign(opts, pattern2, patternId2));
-      }
-    }
-  }
-};
-
-var pushArrayPattern = function (opts, nodes, pattern, parentId) {
-  if (!pattern.elements) return;
-
-  var i;
-
-  var hasRest = false;
-  for (i = 0; i < pattern.elements.length; i++) {
-    if (t.isRestElement(pattern.elements[i])) {
-      hasRest = true;
-      break;
-    }
-  }
-
-  var toArray = opts.file.toArray(parentId, !hasRest && pattern.elements.length);
-
-  var _parentId = opts.scope.generateUidBasedOnNode(parentId, opts.file);
-  nodes.push(buildVariableDeclar(opts, _parentId, toArray));
-  parentId = _parentId;
-
-  for (i = 0; i < pattern.elements.length; i++) {
-    var elem = pattern.elements[i];
-    if (!elem) continue;
-
-    i = +i;
-
-    var newPatternId;
-
-    if (t.isRestElement(elem)) {
-      newPatternId = opts.file.toArray(parentId);
-
-      if (i > 0) {
-        newPatternId = t.callExpression(t.memberExpression(newPatternId, t.identifier("slice")), [t.literal(i)]);
-      }
-
-      elem = elem.argument;
-    } else {
-      newPatternId = t.memberExpression(parentId, t.literal(i), true);
-    }
-
-    push(opts, nodes, elem, newPatternId);
-  }
-};
-
-var pushPattern = function (opts) {
-  var nodes = opts.nodes;
-  var pattern = opts.pattern;
-  var parentId = opts.id;
-  var scope = opts.scope;
-
-  if (!t.isArrayExpression(parentId) && !t.isMemberExpression(parentId) && !t.isIdentifier(parentId)) {
-    var key = scope.generateUidBasedOnNode(parentId);
-    nodes.push(buildVariableDeclar(opts, key, parentId));
-    parentId = key;
-  }
-
-  push(opts, nodes, pattern, parentId);
-};
-
-exports.ForInStatement =
-exports.ForOfStatement = function (node, parent, scope, context, file) {
-  var declar = node.left;
-  if (!t.isVariableDeclaration(declar)) return;
-
-  var pattern = declar.declarations[0].id;
-  if (!t.isPattern(pattern)) return;
-
-  var key = scope.generateUidIdentifier("ref");
-  node.left = t.variableDeclaration(declar.kind, [
-    t.variableDeclarator(key, null)
-  ]);
-
-  var nodes = [];
-
-  push({
-    kind: declar.kind,
-    file: file,
-    scope: scope
-  }, nodes, pattern, key);
-
-  t.ensureBlock(node);
-
-  var block = node.body;
-  block.body = nodes.concat(block.body);
-};
-
-exports.Function = function (node, parent, scope, context, file) {
-  var nodes = [];
-
-  var hasDestructuring = false;
-
-  node.params = node.params.map(function (pattern, i) {
-    if (!t.isPattern(pattern)) return pattern;
-
-    hasDestructuring = true;
-    var parentId = scope.generateUidIdentifier("ref");
-
-    pushPattern({
-      blockHoist: node.params.length - i,
-      pattern:    pattern,
-      nodes:      nodes,
-      scope:      scope,
-      file:       file,
-      kind:       "var",
-      id:         parentId
-    });
-
-    return parentId;
-  });
-
-  if (!hasDestructuring) return;
-
-  t.ensureBlock(node);
-
-  var block = node.body;
-  block.body = nodes.concat(block.body);
-};
-
-exports.CatchClause = function (node, parent, scope, context, file) {
-  var pattern = node.param;
-  if (!t.isPattern(pattern)) return;
-
-  var ref = scope.generateUidIdentifier("ref");
-  node.param = ref;
-
-  var nodes = [];
-
-  push({
-    kind: "var",
-    file: file,
-    scope: scope
-  }, nodes, pattern, ref);
-
-  node.body.body = nodes.concat(node.body.body);
-};
-
-exports.ExpressionStatement = function (node, parent, scope, context, file) {
-  var expr = node.expression;
-  if (expr.type !== "AssignmentExpression") return;
-  if (!t.isPattern(expr.left)) return;
-  if (file.isConsequenceExpressionStatement(node)) return;
-
-  var nodes = [];
-
-  var ref = scope.generateUidIdentifier("ref");
-  nodes.push(t.variableDeclaration("var", [
-    t.variableDeclarator(ref, expr.right)
-  ]));
-
-  push({
-    operator: expr.operator,
-    file: file,
-    scope: scope
-  }, nodes, expr.left, ref);
-
-  return nodes;
-};
-
-exports.AssignmentExpression = function (node, parent, scope, context, file) {
-  if (!t.isPattern(node.left)) return;
-
-  var ref = scope.generateUidIdentifier("temp");
-  scope.push({
-    key: ref.name,
-    id: ref
-  });
-
-  var nodes = [];
-  nodes.push(t.assignmentExpression("=", ref, node.right));
-
-  push({
-    operator: node.operator,
-    file: file,
-    scope: scope
-  }, nodes, node.left, ref);
-
-  nodes.push(ref);
-
-  return t.toSequenceExpression(nodes, scope);
-};
-
-exports.VariableDeclaration = function (node, parent, scope, context, file) {
-  if (t.isForInStatement(parent) || t.isForOfStatement(parent)) return;
-
-  var nodes = [];
-  var i;
-  var declar;
-
-  var hasPattern = false;
-  for (i = 0; i < node.declarations.length; i++) {
-    declar = node.declarations[i];
-    if (t.isPattern(declar.id)) {
-      hasPattern = true;
-      break;
-    }
-  }
-  if (!hasPattern) return;
-
-  for (i = 0; i < node.declarations.length; i++) {
-    declar = node.declarations[i];
-
-    var patternId = declar.init;
-    var pattern   = declar.id;
-    var opts = {
-      pattern: pattern,
-      nodes:   nodes,
-      scope:   scope,
-      kind:    node.kind,
-      file:    file,
-      id:      patternId,
-    };
-
-    if (t.isPattern(pattern) && patternId) {
-      pushPattern(opts);
-
-      if (+i !== node.declarations.length - 1) {
-        // we aren't the last declarator so let's just make the
-        // last transformed node inherit from us
-        t.inherits(nodes[nodes.length - 1], declar);
-      }
-    } else {
-      nodes.push(t.inherits(buildVariableAssign(opts, declar.id, declar.init), declar));
-    }
-  }
-
-  if (!t.isProgram(parent) && !t.isBlockStatement(parent)) {
-    declar = null;
-
-    for (i = 0; i < nodes.length; i++) {
-      node = nodes[i];
-      declar = declar || t.variableDeclaration(node.kind, []);
-
-      if (!t.isVariableDeclaration(node) && declar.kind !== node.kind) {
-        throw file.errorWithNode(node, "Cannot use this node within the current parent");
-      }
-
-      declar.declarations = declar.declarations.concat(node.declarations);
-    }
-
-    return declar;
-  }
-
-  return nodes;
-};

lib/6to5/transformation/transformers/es6/for-of.js

@@ -1,100 +0,0 @@
-"use strict";
-
-var util = require("../../../util");
-var t    = require("../../../types");
-
-exports.ForOfStatement = function (node, parent, scope, context, file) {
-  var callback = spec;
-  if (file.isLoose("es6.forOf")) callback = loose;
-
-  var build  = callback(node, parent, scope, context, file);
-  var declar = build.declar;
-  var loop   = build.loop;
-  var block  = loop.body;
-
-  // inherit comments from the original loop
-  t.inheritsComments(loop, node);
-
-  // ensure that it's a block so we can take all it's statemetns
-  t.ensureBlock(node);
-
-  // add the value declaration to the new loop body
-  if (declar) {
-    if (build.shouldUnshift) {
-      block.body.unshift(declar);
-    } else {
-      block.body.push(declar);
-    }
-  }
-
-  // push the rest of the original loop body onto our new body
-  block.body = block.body.concat(node.body.body);
-
-  // todo: find out why this is necessary? #538
-  loop._scopeInfo = node._scopeInfo;
-
-  return loop;
-};
-
-var loose = function (node, parent, scope, context, file) {
-  var left = node.left;
-  var declar, id;
-
-  if (t.isIdentifier(left) || t.isPattern(left)) {
-    // for (i of test), for ({ i } of test)
-    id = left;
-  } else if (t.isVariableDeclaration(left)) {
-    // for (var i of test)
-    id = left.declarations[0].id;
-    declar = t.variableDeclaration(left.kind, [
-      t.variableDeclarator(id)
-    ]);
-  } else {
-    throw file.errorWithNode(left, "Unknown node type " + left.type + " in ForOfStatement");
-  }
-
-  var loop = util.template("for-of-loose", {
-    LOOP_OBJECT:  scope.generateUidIdentifier("iterator"),
-    IS_ARRAY:     scope.generateUidIdentifier("isArray"),
-    OBJECT:       node.right,
-    INDEX:        scope.generateUidIdentifier("i"),
-    ID:           id
-  });
-
-  return {
-    shouldUnshift: true,
-    declar:        declar,
-    loop:          loop
-  };
-};
-
-var spec = function (node, parent, scope, context, file) {
-  var left = node.left;
-  var declar;
-
-  var stepKey   = scope.generateUidIdentifier("step");
-  var stepValue = t.memberExpression(stepKey, t.identifier("value"));
-
-  if (t.isIdentifier(left) || t.isPattern(left)) {
-    // for (i of test), for ({ i } of test)
-    declar = t.expressionStatement(t.assignmentExpression("=", left, stepValue));
-  } else if (t.isVariableDeclaration(left)) {
-    // for (var i of test)
-    declar = t.variableDeclaration(left.kind, [
-      t.variableDeclarator(left.declarations[0].id, stepValue)
-    ]);
-  } else {
-    throw file.errorWithNode(left, "Unknown node type " + left.type + " in ForOfStatement");
-  }
-
-  var loop = util.template("for-of", {
-    ITERATOR_KEY: scope.generateUidIdentifier("iterator"),
-    STEP_KEY:     stepKey,
-    OBJECT:       node.right
-  });
-
-  return {
-    declar: declar,
-    loop:   loop
-  };
-};

lib/6to5/transformation/transformers/es6/properties.shorthand.js

@@ -1,17 +0,0 @@
-"use strict";
-
-var nameMethod = require("../../helpers/name-method");
-var t          = require("../../../types");
-var _          = require("lodash");
-
-exports.Property = function (node, parent, scope, context, file) {
-  if (node.method) {
-    node.method = false;
-    nameMethod.property(node, file, scope);
-  }
-
-  if (node.shorthand) {
-    node.shorthand = false;
-    node.key = t.removeComments(_.clone(node.key));
-  }
-};

lib/6to5/transformation/transformers/internal/declarations.js

@@ -1,36 +0,0 @@
-"use strict";
-
-var useStrict = require("../../helpers/use-strict");
-var t         = require("../../../types");
-
-exports.secondPass = true;
-
-exports.BlockStatement =
-exports.Program = function (node) {
-  if (!node._declarations) return;
-
-  var kinds = {};
-  var kind;
-
-  useStrict.wrap(node, function () {
-    for (var i in node._declarations) {
-      var declar = node._declarations[i];
-
-      kind = declar.kind || "var";
-      var declarNode = t.variableDeclarator(declar.id, declar.init);
-
-      if (!declar.init) {
-        kinds[kind] = kinds[kind] || [];
-        kinds[kind].push(declarNode);
-      } else {
-        node.body.unshift(t.variableDeclaration(kind, [declarNode]));
-      }
-    }
-
-    for (kind in kinds) {
-      node.body.unshift(t.variableDeclaration(kind, kinds[kind]));
-    }
-  });
-
-  node._declarations = null;
-};

lib/6to5/transformation/transformers/internal/module-formatter.js

@@ -1,17 +0,0 @@
-"use strict";
-
-var useStrict = require("../../helpers/use-strict");
-
-exports.ast = {
-  exit: function (ast, file) {
-    if (!file.transformers["es6.modules"].canRun()) return;
-
-    useStrict.wrap(ast.program, function () {
-      ast.program.body = file.dynamicImports.concat(ast.program.body);
-    });
-
-    if (file.moduleFormatter.transform) {
-      file.moduleFormatter.transform(ast);
-    }
-  }
-};

lib/6to5/transformation/transformers/other/react.js

@@ -1,265 +0,0 @@
-"use strict";
-
-// Based upon the excellent jsx-transpiler by Ingvar Stepanyan (RReverser)
-// https://github.com/RReverser/jsx-transpiler
-
-// jsx
-
-var esutils = require("esutils");
-var t       = require("../../../types");
-
-exports.JSXIdentifier = function (node) {
-  if (esutils.keyword.isIdentifierName(node.name)) {
-    node.type = "Identifier";
-  } else {
-    return t.literal(node.name);
-  }
-};
-
-exports.JSXNamespacedName = function (node, parent, scope, context, file) {
-  throw file.errorWithNode(node, "Namespace tags are not supported. ReactJSX is not XML.");
-};
-
-exports.JSXMemberExpression = {
-  exit: function (node) {
-    node.computed = t.isLiteral(node.property);
-    node.type = "MemberExpression";
-  }
-};
-
-exports.JSXExpressionContainer = function (node) {
-  return node.expression;
-};
-
-exports.JSXAttribute = {
-  exit: function (node) {
-    var value = node.value || t.literal(true);
-    return t.inherits(t.property("init", node.name, value), node);
-  }
-};
-
-var isCompatTag = function (tagName) {
-  return /^[a-z]|\-/.test(tagName);
-};
-
-exports.JSXOpeningElement = {
-  exit: function (node, parent, scope, context, file) {
-    var reactCompat = file.opts.reactCompat;
-    var tagExpr = node.name;
-    var args = [];
-
-    var tagName;
-    if (t.isIdentifier(tagExpr)) {
-      tagName = tagExpr.name;
-    } else if (t.isLiteral(tagExpr)) {
-      tagName = tagExpr.value;
-    }
-
-    if (!reactCompat) {
-      if (tagName && isCompatTag(tagName)) {
-        args.push(t.literal(tagName));
-      } else {
-        args.push(tagExpr);
-      }
-    }
-
-    var attribs = node.attributes;
-    if (attribs.length) {
-      attribs = buildJSXOpeningElementAttributes(attribs, file);
-    } else {
-      attribs = t.literal(null);
-    }
-
-    args.push(attribs);
-
-    if (reactCompat) {
-      if (tagName && isCompatTag(tagName)) {
-        return t.callExpression(
-          t.memberExpression(
-            t.memberExpression(t.identifier("React"), t.identifier("DOM")),
-            tagExpr,
-            t.isLiteral(tagExpr)
-          ),
-          args
-        );
-      }
-    } else {
-      tagExpr = t.memberExpression(t.identifier("React"), t.identifier("createElement"));
-    }
-
-    return t.callExpression(tagExpr, args);
-  }
-};
-
-/**
- * The logic for this is quite terse. It's because we need to
- * support spread elements. We loop over all attributes,
- * breaking on spreads, we then push a new object containg
- * all prior attributes to an array for later processing.
- */
-
-var buildJSXOpeningElementAttributes = function (attribs, file) {
-  var _props = [];
-  var objs = [];
-
-  var pushProps = function () {
-    if (!_props.length) return;
-
-    objs.push(t.objectExpression(_props));
-    _props = [];
-  };
-
-  while (attribs.length) {
-    var prop = attribs.shift();
-    if (t.isJSXSpreadAttribute(prop)) {
-      pushProps();
-      objs.push(prop.argument);
-    } else {
-      _props.push(prop);
-    }
-  }
-
-  pushProps();
-
-  if (objs.length === 1) {
-    // only one object
-    attribs = objs[0];
-  } else {
-    // looks like we have multiple objects
-    if (!t.isObjectExpression(objs[0])) {
-      objs.unshift(t.objectExpression([]));
-    }
-
-    // spread it
-    attribs = t.callExpression(
-      file.addHelper("extends"),
-      objs
-    );
-  }
-
-  return attribs;
-};
-
-exports.JSXElement = {
-  exit: function (node) {
-    var callExpr = node.openingElement;
-
-    for (var i = 0; i < node.children.length; i++) {
-      var child = node.children[i];
-
-      if (t.isLiteral(child) && typeof child.value === "string") {
-        cleanJSXElementLiteralChild(child, callExpr.arguments);
-        continue;
-      } else if (t.isJSXEmptyExpression(child)) {
-        continue;
-      }
-
-      callExpr.arguments.push(child);
-    }
-
-    if (callExpr.arguments.length >= 3) {
-      callExpr._prettyCall = true;
-    }
-
-    return t.inherits(callExpr, node);
-  }
-};
-
-var cleanJSXElementLiteralChild = function (child, args) {
-  var lines = child.value.split(/\r\n|\n|\r/);
-
-  for (var i = 0; i < lines.length; i++) {
-    var line = lines[i];
-
-    var isFirstLine = i === 0;
-    var isLastLine = i === lines.length - 1;
-
-    // replace rendered whitespace tabs with spaces
-    var trimmedLine = line.replace(/\t/g, " ");
-
-    // trim whitespace touching a newline
-    if (!isFirstLine) {
-      trimmedLine = trimmedLine.replace(/^[ ]+/, "");
-    }
-
-    // trim whitespace touching an endline
-    if (!isLastLine) {
-      trimmedLine = trimmedLine.replace(/[ ]+$/, "");
-    }
-
-    if (trimmedLine) {
-      args.push(t.literal(trimmedLine));
-    }
-  }
-};
-
-// display names
-
-var isCreateClass = function (call) {
-  if (!call || !t.isCallExpression(call)) return false;
-
-  var callee = call.callee;
-  if (!t.isMemberExpression(callee)) return false;
-
-  // not React call member object
-  var obj = callee.object;
-  if (!t.isIdentifier(obj, { name: "React" })) return false;
-
-  // not createClass call member property
-  var prop = callee.property;
-  if (!t.isIdentifier(prop, { name: "createClass" })) return false;
-
-  // no call arguments
-  var args = call.arguments;
-  if (args.length !== 1) return false;
-
-  // first call arg is not an object
-  var first = args[0];
-  if (!t.isObjectExpression(first)) return;
-
-  return true;
-};
-
-var addDisplayName = function (id, call) {
-  if (!isCreateClass(call)) return;
-
-  var props = call.arguments[0].properties;
-  var safe = true;
-
-  for (var i = 0; i < props.length; i++) {
-    var prop = props[i];
-    if (t.isIdentifier(prop.key, { name: "displayName" })) {
-      safe = false;
-      break;
-    }
-  }
-
-  if (safe) {
-    props.unshift(t.property("init", t.identifier("displayName"), t.literal(id)));
-  }
-};
-
-exports.AssignmentExpression =
-exports.Property =
-exports.VariableDeclarator = function (node) {
-  var left, right;
-
-  if (t.isAssignmentExpression(node)) {
-    left = node.left;
-    right = node.right;
-  } else if (t.isProperty(node)) {
-    left = node.key;
-    right = node.value;
-  } else if (t.isVariableDeclarator(node)) {
-    left = node.id;
-    right = node.init;
-  }
-
-  if (t.isMemberExpression(left)) {
-    left = left.property;
-  }
-
-  if (t.isIdentifier(left)) {
-    addDisplayName(left.name, right);
-  }
-};

lib/6to5/transformation/transformers/other/regenerator.js

@@ -1,11 +0,0 @@
-"use strict";
-
-var regenerator = require("regenerator-6to5");
-
-exports.ast = {
-  before: function (ast, file) {
-    regenerator.transform(ast, {
-      includeRuntime: file.opts.includeRegenerator && "if used"
-    });
-  }
-};

lib/6to5/transformation/transformers/other/self-contained.js

@@ -1,87 +0,0 @@
-"use strict";
-
-var traverse = require("../../../traverse");
-var util     = require("../../../util");
-var core     = require("core-js/library");
-var t        = require("../../../types");
-var _        = require("lodash");
-
-var coreHas = function (node) {
-  return node.name !== "_" && _.has(core, node.name);
-};
-
-var ALIASABLE_CONSTRUCTORS = [
-  "Symbol",
-  "Promise",
-  "Map",
-  "WeakMap",
-  "Set",
-  "WeakSet"
-];
-
-var astVisitor = {
-  enter: function (node, parent, scope, context, file) {
-    var prop;
-
-    if (t.isMemberExpression(node) && t.isReferenced(node, parent)) {
-      // Array.from -> _core.Array.from
-      var obj = node.object;
-      prop = node.property;
-
-      if (!t.isReferenced(obj, node)) return;
-
-      if (!node.computed && coreHas(obj) && _.has(core[obj.name], prop.name)) {
-        context.skip();
-        return t.prependToMemberExpression(node, file.get("coreIdentifier"));
-      }
-    } else if (t.isReferencedIdentifier(node, parent) && !t.isMemberExpression(parent) && _.contains(ALIASABLE_CONSTRUCTORS, node.name) && !scope.get(node.name, true)) {
-      // Symbol() -> _core.Symbol(); new Promise -> new _core.Promise
-      return t.memberExpression(file.get("coreIdentifier"), node);
-    } else if (t.isCallExpression(node)) {
-      // arr[Symbol.iterator]() -> _core.$for.getIterator(arr)
-
-      if (node.arguments.length) return;
-
-      var callee = node.callee;
-      if (!t.isMemberExpression(callee)) return;
-      if (!callee.computed) return;
-
-      prop = callee.property;
-      if (!t.isIdentifier(prop.object, { name: "Symbol" })) return;
-      if (!t.isIdentifier(prop.property, { name: "iterator" })) return;
-
-      return util.template("corejs-iterator", {
-        CORE_ID: file.get("coreIdentifier"),
-        VALUE:   callee.object
-      });
-    }
-  }
-};
-
-exports.optional = true;
-
-exports.ast = {
-  enter: function (ast, file) {
-    file.setDynamic("runtimeIdentifier", function () {
-      return file.addImport("6to5-runtime/helpers", "to5Helpers");
-    });
-
-    file.setDynamic("coreIdentifier", function () {
-      return file.addImport("6to5-runtime/core-js", "core");
-    });
-
-    file.setDynamic("regeneratorIdentifier", function () {
-      return file.addImport("6to5-runtime/regenerator", "regeneratorRuntime");
-    });
-  },
-
-  after: function (ast, file) {
-    traverse(ast, astVisitor, null, file);
-  }
-};
-
-exports.Identifier = function (node, parent, scope, context, file) {
-  if (node.name === "regeneratorRuntime" && t.isReferenced(node, parent)) {
-    return file.get("regeneratorIdentifier");
-  }
-};

lib/6to5/transformation/transformers/other/use-strict.js

@@ -1,21 +0,0 @@
-"use strict";
-
-var useStrict = require("../../helpers/use-strict");
-var t         = require("../../../types");
-
-exports.ast = {
-  exit: function (ast) {
-    if (!useStrict.has(ast.program)) {
-      ast.program.body.unshift(t.expressionStatement(t.literal("use strict")));
-    }
-  }
-};
-
-exports.FunctionDeclaration =
-exports.FunctionExpression = function (node, parent, scope, context) {
-  context.skip();
-};
-
-exports.ThisExpression = function (node, parent, scope, context, file) {
-  throw file.errorWithNode(node, "Top level `this` is not allowed", ReferenceError);
-};

lib/6to5/transformation/transformers/validation/no-for-in-of-assignment.js

@@ -1,12 +0,0 @@
-"use strict";
-
-var t = require("../../../types");
-
-exports.ForInStatement =
-exports.ForOfStatement = function (node, parent, scope, context, file) {
-  var left = node.left;
-  if (t.isVariableDeclaration(left)) {
-    var declar = left.declarations[0];
-    if (declar.init) throw file.errorWithNode(declar, "No assignments allowed in for-in/of head");
-  }
-};

lib/6to5/transformation/transformers/validation/setters.js

@@ -1,8 +0,0 @@
-"use strict";
-
-exports.MethodDefinition =
-exports.Property = function (node, parent, scope, context, file) {
-  if (node.kind === "set" && node.value.params.length !== 1) {
-    throw file.errorWithNode(node.value, "Setters must have only one parameter");
-  }
-};

lib/6to5/transformation/transformers/validation/undeclared-variable-check.js

@@ -1,9 +0,0 @@
-"use strict";
-
-exports.optional = true;
-
-exports.Identifier = function (node, parent, scope, context, file) {
-  if (!scope.has(node.name, true)) {
-    throw file.errorWithNode(node, "Reference to undeclared variable", ReferenceError);
-  }
-};

lib/6to5/traverse/global-keys.json

@@ -1,64 +0,0 @@
-[
-  "Set",
-  "Map",
-  "WeakMap",
-  "WeakSet",
-  "Proxy",
-  "Promise",
-  "Reflect",
-  "Symbol",
-  "System",
-  "__filename",
-  "__dirname",
-  "GLOBAL",
-  "global",
-  "module",
-  "require",
-  "Buffer",
-  "console",
-  "exports",
-  "process",
-  "setTimeout",
-  "clearTimeout",
-  "setInterval",
-  "clearInterval",
-  "setImmediate",
-  "clearImmediate",
-  "Array",
-  "Boolean",
-  "Date",
-  "decodeURI",
-  "decodeURIComponent",
-  "encodeURI",
-  "encodeURIComponent",
-  "Error",
-  "eval",
-  "EvalError",
-  "Function",
-  "hasOwnProperty",
-  "isFinite",
-  "isNaN",
-  "JSON",
-  "Map",
-  "Math",
-  "Number",
-  "Object",
-  "Proxy",
-  "Promise",
-  "parseInt",
-  "parseFloat",
-  "RangeError",
-  "ReferenceError",
-  "RegExp",
-  "Set",
-  "String",
-  "SyntaxError",
-  "TypeError",
-  "URIError",
-  "WeakMap",
-  "WeakSet",
-  "arguments",
-  "NaN",
-  "window",
-  "self"
-]

lib/6to5/traverse/index.js

@@ -1,260 +0,0 @@
-"use strict";
-
-module.exports = traverse;
-
-/* jshint maxparams:7 */
-
-var Scope = require("./scope");
-var t     = require("../types");
-var _     = require("lodash");
-
-function TraversalContext() {
-  this.shouldFlatten = false;
-  this.shouldRemove  = false;
-  this.shouldSkip    = false;
-  this.shouldStop    = false;
-}
-
-TraversalContext.prototype.flatten = function () {
-  this.shouldFlatten = true;
-};
-
-TraversalContext.prototype.remove = function () {
-  this.shouldRemove = true;
-  this.shouldSkip   = true;
-};
-
-TraversalContext.prototype.skip = function () {
-  this.shouldSkip = true;
-};
-
-TraversalContext.prototype.stop = function () {
-  this.shouldStop = true;
-  this.shouldSkip = true;
-};
-
-TraversalContext.prototype.reset = function () {
-  this.shouldRemove = false;
-  this.shouldSkip   = false;
-  this.shouldStop   = false;
-};
-
-function replaceNode(obj, key, node, result) {
-  var isArray = Array.isArray(result);
-
-  // inherit comments from original node to the first replacement node
-  var inheritTo = result;
-  if (isArray) inheritTo = result[0];
-  if (inheritTo) t.inheritsComments(inheritTo, node);
-
-  // replace the node
-  obj[key] = result;
-
-  // we're replacing a statement or block node with an array of statements so we better
-  // ensure that it's a block
-  if (isArray && _.contains(t.STATEMENT_OR_BLOCK_KEYS, key) && !t.isBlockStatement(obj)) {
-    t.ensureBlock(obj, key);
-  }
-
-  if (isArray) {
-    return true;
-  }
-}
-
-TraversalContext.prototype.enterNode = function (obj, key, node, enter, parent, scope, state) {
-  var result = enter(node, parent, scope, this, state);
-  var flatten = false;
-
-  if (result) {
-    flatten = replaceNode(obj, key, node, result);
-    node = result;
-
-    if (flatten) {
-      this.shouldFlatten = true;
-    }
-  }
-
-  if (this.shouldRemove) {
-    obj[key] = null;
-    this.shouldFlatten = true;
-  }
-
-  return node;
-};
-
-TraversalContext.prototype.exitNode = function (obj, key, node, exit, parent, scope, state) {
-  var result = exit(node, parent, scope, this, state);
-  var flatten = false;
-
-  if (result) {
-    flatten = replaceNode(obj, key, node, result);
-    node = result;
-
-    if (flatten) {
-      this.shouldFlatten = true;
-    }
-  }
-
-  return node;
-};
-
-TraversalContext.prototype.visitNode = function (obj, key, opts, scope, parent, state) {
-  this.reset();
-
-  var node = obj[key];
-
-  // type is blacklisted
-  if (opts.blacklist && opts.blacklist.indexOf(node.type) > -1) {
-    return;
-  }
-
-  var ourScope = scope;
-  // we're entering a new scope so let's construct it!
-  if (t.isScope(node)) {
-    ourScope = new Scope(node, parent, scope);
-  }
-
-  node = this.enterNode(obj, key, node, opts.enter, parent, ourScope, state);
-
-  if (this.shouldSkip) {
-    return this.shouldStop;
-  }
-
-  if (Array.isArray(node)) {
-    // traverse over these replacement nodes we purposely don't call exitNode
-    // as the original node has been destroyed
-    for (var i = 0; i < node.length; i++) {
-      traverseNode(node[i], opts, ourScope, state);
-    }
-  } else {
-    traverseNode(node, opts, ourScope, state);
-    this.exitNode(obj, key, node, opts.exit, parent, ourScope, state);
-  }
-
-  return this.shouldStop;
-};
-
-TraversalContext.prototype.visit = function (node, key, opts, scope, state) {
-  var nodes = node[key];
-  if (!nodes) return;
-
-  if (!Array.isArray(nodes)) {
-    return this.visitNode(node, key, opts, scope, node, state);
-  }
-
-  if (nodes.length === 0) {
-    return;
-  }
-
-  for (var i = 0; i < nodes.length; i++) {
-    if (nodes[i] && this.visitNode(nodes, i, opts, scope, node, state)) {
-      return true;
-    }
-  }
-
-  if (this.shouldFlatten) {
-    node[key] = _.flatten(node[key]);
-
-    if (key === "body") {
-      // we can safely compact this
-      node[key] = _.compact(node[key]);
-    }
-  }
-};
-
-function traverseNode(node, opts, scope, state) {
-  var keys = t.VISITOR_KEYS[node.type];
-  if (!keys) return;
-
-  var context = new TraversalContext();
-  for (var i = 0; i < keys.length; i++) {
-    if (context.visit(node, keys[i], opts, scope, state)) {
-      return;
-    }
-  }
-}
-
-function traverse(parent, opts, scope, state) {
-  if (!parent) return;
-
-  if (!scope) {
-    if (parent.type !== "Program" && parent.type !== "File") {
-      throw new Error("Must pass a scope unless traversing a Program/File got a " + parent.type + " node");
-    }
-  }
-
-  if (!opts) opts = {};
-  if (!opts.enter) opts.enter = _.noop;
-  if (!opts.exit) opts.exit = _.noop;
-
-  // array of nodes
-  if (Array.isArray(parent)) {
-    for (var i = 0; i < parent.length; i++) {
-      traverseNode(parent[i], opts, scope, state);
-    }
-  } else {
-    traverseNode(parent, opts, scope, state);
-  }
-}
-
-function clearNode(node) {
-  node._declarations = null;
-  node.extendedRange = null;
-  node._scopeInfo = null;
-  node.tokens = null;
-  node.range = null;
-  node.start = null;
-  node.end = null;
-  node.loc = null;
-  node.raw = null;
-
-  if (Array.isArray(node.trailingComments)) {
-    clearComments(node.trailingComments);
-  }
-
-  if (Array.isArray(node.leadingComments)) {
-    clearComments(node.leadingComments);
-  }
-}
-
-var clearVisitor = { enter: clearNode };
-
-function clearComments(comments) {
-  for (var i = 0; i < comments.length; i++) {
-    clearNode(comments[i]);
-  }
-}
-
-traverse.removeProperties = function (tree) {
-  clearNode(tree);
-  traverse(tree, clearVisitor);
-
-  return tree;
-};
-
-function hasBlacklistedType(node, parent, scope, context, state) {
-  if (node.type === state.type) {
-    state.has = true;
-    context.skip();
-  }
-}
-
-traverse.hasType = function (tree, scope, type, blacklistTypes) {
-  // the node we're searching in is blacklisted
-  if (_.contains(blacklistTypes, tree.type)) return false;
-
-  // the type we're looking for is the same as the passed node
-  if (tree.type === type) return true;
-
-  var state = {
-    has:  false,
-    type: type
-  };
-
-  traverse(tree, {
-    blacklist: blacklistTypes,
-    enter: hasBlacklistedType
-  }, scope, state);
-
-  return state.has;
-};

lib/6to5/traverse/scope.js

@@ -1,411 +0,0 @@
-"use strict";
-
-module.exports = Scope;
-
-var traverse = require("./index");
-var object   = require("../helpers/object");
-var t        = require("../types");
-var _        = require("lodash");
-
-var FOR_KEYS = ["left", "init"];
-
-/**
- * This searches the current "scope" and collects all references/declarations
- * within.
- *
- * @param {Node} block
- * @param {Node} parentBlock
- * @param {Scope} [parent]
- * @param {File} [file]
- */
-
-function Scope(block, parentBlock, parent, file) {
-  this.parent = parent;
-  this.file   = parent ? parent.file : file;
-
-  this.parentBlock = parentBlock;
-  this.block       = block;
-
-  var info = this.getInfo();
-  this.references = info.references;
-  this.declarations = info.declarations;
-  this.declarationKinds = info.declarationKinds;
-}
-
-Scope.defaultDeclarations = require("./global-keys");
-
-Scope.prototype._add = function (node, references, throwOnDuplicate) {
-  if (!node) return;
-
-  var ids = t.getIds(node, true);
-
-  for (var key in ids) {
-    var id = ids[key];
-
-    if (throwOnDuplicate && references[key]) {
-      throw this.file.errorWithNode(id, "Duplicate declaration", TypeError);
-    }
-
-    references[key] = id;
-  }
-};
-
-/**
- * Description
- *
- * @param {File} file
- * @param {String} [name="temp"]
- */
-
-Scope.prototype.generateTemp = function (file, name) {
-  var id = file.generateUidIdentifier(name || "temp", this);
-  this.push({
-    key: id.name,
-    id: id
-  });
-  return id;
-};
-
-/**
- * Description
- *
- * @param {String} name
- */
-
-Scope.prototype.generateUidIdentifier = function (name) {
-  return this.file.generateUidIdentifier(name, this);
-};
-
-/*
- * Description
- *
- * @param {Object} parent
- * @returns {Object}
- */
-
-Scope.prototype.generateUidBasedOnNode = function (parent) {
-  var node = parent;
-
-  if (t.isAssignmentExpression(parent)) {
-    node = parent.left;
-  } else if (t.isVariableDeclarator(parent)) {
-    node = parent.id;
-  } else if (t.isProperty(node)) {
-    node = node.key;
-  }
-
-  var parts = [];
-
-  var add = function (node) {
-    if (t.isMemberExpression(node)) {
-      add(node.object);
-      add(node.property);
-    } else if (t.isIdentifier(node)) {
-      parts.push(node.name);
-    } else if (t.isLiteral(node)) {
-      parts.push(node.value);
-    } else if (t.isCallExpression(node)) {
-      add(node.callee);
-    }
-  };
-
-  add(node);
-
-  var id = parts.join("$");
-  id = id.replace(/^_/, "") || "ref";
-
-  return this.file.generateUidIdentifier(id, this);
-};
-
-/**
- * Description
- *
- * @param {Object} node
- * @returns {Object}
- */
-
-Scope.prototype.generateTempBasedOnNode = function (node) {
-  if (t.isIdentifier(node) && this.has(node.name, true)) {
-    return null;
-  }
-
-  var id = this.generateUidBasedOnNode(node);
-  this.push({
-    key: id.name,
-    id: id
-  });
-  return id;
-};
-
-var functionVariableVisitor = {
-  enter: function (node, parent, scope, context, state) {
-    if (t.isFor(node)) {
-      _.each(FOR_KEYS, function (key) {
-        var declar = node[key];
-        if (t.isVar(declar)) state.add(declar);
-      });
-    }
-
-    // this block is a function so we'll stop since none of the variables
-    // declared within are accessible
-    if (t.isFunction(node)) return context.skip();
-
-    // function identifier doesn't belong to this scope
-    if (state.blockId && node === state.blockId) return;
-
-    // we've ran into a declaration!
-    // we'll let the BlockStatement scope deal with `let` declarations unless
-    if (t.isDeclaration(node) && !t.isBlockScoped(node)) {
-      state.add(node);
-    }
-  }
-};
-
-var programReferenceVisitor = {
-  enter: function (node, parent, scope, context, add) {
-    if (t.isReferencedIdentifier(node, parent) && !scope.has(node.name)) {
-      add(node, true);
-    }
-  }
-};
-
-var blockVariableVisitor = {
-  enter: function (node, parent, scope, context, add) {
-    if (t.isBlockScoped(node)) {
-      add(node, false, t.isLet(node));
-    } else if (t.isScope(node)) {
-      context.skip();
-    }
-  }
-};
-
-Scope.prototype.getInfo = function () {
-  var parent = this.parent;
-  var block  = this.block;
-  var self   = this;
-  if (block._scopeInfo) return block._scopeInfo;
-
-  var info = block._scopeInfo = {};
-  var references = info.references = object();
-  var declarations = info.declarations = object();
-  var declarationKinds = info.declarationKinds = {};
-
-  var add = function (node, reference, throwOnDuplicate) {
-    self._add(node, references);
-
-    if (!reference) {
-      self._add(node, declarations, throwOnDuplicate);
-      self._add(node, declarationKinds[node.kind] = declarationKinds[node.kind] || object());
-    }
-  };
-
-  if (parent && t.isBlockStatement(block) && t.isFor(parent.block, { body: block })) {
-    // delegate block let declarations to the parent loop
-    return info;
-  }
-
-  // ForStatement - left, init
-
-  if (t.isFor(block)) {
-    _.each(FOR_KEYS, function (key) {
-      var node = block[key];
-      if (t.isBlockScoped(node)) add(node, false, true);
-    });
-
-    if (t.isBlockStatement(block.body)) {
-      block = block.body;
-    }
-  }
-
-  // Program, BlockStatement - let variables
-
-  if (t.isBlockStatement(block) || t.isProgram(block)) {
-    traverse(block, blockVariableVisitor, this, add);
-  }
-
-  // CatchClause - param
-
-  if (t.isCatchClause(block)) {
-    add(block.param);
-  }
-
-  // ComprehensionExpression - blocks
-
-  if (t.isComprehensionExpression(block)) {
-    add(block);
-  }
-
-  // Program, Function - var variables
-
-  if (t.isProgram(block) || t.isFunction(block)) {
-    traverse(block, functionVariableVisitor, this, {
-      blockId: block.id,
-      add:     add
-    });
-  }
-
-  if (t.isFunctionExpression(block) && block.id) {
-    if (!t.isProperty(this.parentBlock, { method: true })) {
-      // SpiderMonkey AST doesn't use MethodDefinition here when it probably
-      // should since they should be semantically the same?
-      add(block.id);
-    }
-  }
-
-  // Program
-
-  if (t.isProgram(block)) {
-    traverse(block, programReferenceVisitor, this, add);
-  }
-
-  // Function - params, rest
-
-  if (t.isFunction(block)) {
-    _.each(block.params, function (param) {
-      add(param);
-    });
-  }
-
-  return info;
-};
-
-/**
- * Description
- *
- * @param {Object} opts
- */
-
-Scope.prototype.push = function (opts) {
-  var block = this.block;
-
-  if (t.isFor(block) || t.isCatchClause(block) || t.isFunction(block)) {
-    t.ensureBlock(block);
-    block = block.body;
-  }
-
-  if (t.isBlockStatement(block) || t.isProgram(block)) {
-    block._declarations = block._declarations || {};
-    block._declarations[opts.key] = {
-      kind: opts.kind,
-      id: opts.id,
-      init: opts.init
-    };
-  } else {
-    throw new TypeError("cannot add a declaration here in node type " + block.type);
-  }
-};
-
-/**
- * Walk up the scope tree until we hit a `Function` and then
- * push our `node` to it's references.
- *
- * @param {Object} node
- */
-
-Scope.prototype.add = function (node) {
-  var scope = this.getFunctionParent();
-  scope._add(node, scope.references);
-};
-
-/**
- * Walk up the scope tree until we hit either a Function or reach the
- * very top at hit Program.
- */
-
-Scope.prototype.getFunctionParent = function () {
-  var scope = this;
-  while (scope.parent && !t.isFunction(scope.block)) {
-    scope = scope.parent;
-  }
-  return scope;
-};
-
-/**
- * Walks the scope tree and gathers all declarations of `kind`.
- *
- * @returns {Object}
- */
-
-Scope.prototype.getAllOfKind = function (kind) {
-  var ids = object();
-
-  var scope = this;
-  do {
-    _.defaults(ids, scope.declarationKinds[kind]);
-    scope = scope.parent;
-  } while (scope);
-
-  return ids;
-};
-
-/**
- * Description
- *
- * @param {String} [id]
- * @param {Boolean} [decl]
- */
-
-Scope.prototype.get = function (id, decl) {
-  return id && (this.getOwn(id, decl) || this.parentGet(id, decl));
-};
-
-/**
- * Description
- *
- * @param {String} [id]
- * @param {Boolean} [decl]
- */
-
-Scope.prototype.getOwn = function (id, decl) {
-  var refs = this.references;
-  if (decl) refs = this.declarations;
-  return _.has(refs, id) && refs[id];
-};
-
-/**
- * Description
- *
- * @param {String} [id]
- * @param {Boolean} [decl]
- */
-
-Scope.prototype.parentGet = function (id, decl) {
-  return this.parent && this.parent.get(id, decl);
-};
-
-/**
- * Description
- *
- * @param {String} [id]
- * @param {Boolean} [decl]
- * @returns {Boolean}
- */
-
-Scope.prototype.has = function (id, decl) {
-  return (id && (this.hasOwn(id, decl) || this.parentHas(id, decl))) ||
-         _.contains(Scope.defaultDeclarations, id);
-};
-
-/**
- * Description
- *
- * @param {String} [id]
- * @param {Boolean} [decl]
- * @returns {Boolean}
- */
-
-Scope.prototype.hasOwn = function (id, decl) {
-  return !!this.getOwn(id, decl);
-};
-
-/**
- * Description
- *
- * @param {String} [id]
- * @param {Boolean} [decl]
- * @returns {Boolean}
- */
-
-Scope.prototype.parentHas = function (id, decl) {
-  return this.parent && this.parent.has(id, decl);
-};

lib/6to5/types/alias-keys.json

@@ -1,71 +0,0 @@
-{
-  "ExpressionStatement": ["Statement"],
-  "BreakStatement":      ["Statement"],
-  "ContinueStatement":   ["Statement"],
-  "DebuggerStatement":   ["Statement"],
-  "DoWhileStatement":    ["Statement", "Loop", "While"],
-  "IfStatement":         ["Statement"],
-  "ReturnStatement":     ["Statement"],
-  "SwitchStatement":     ["Statement"],
-  "ThrowStatement":      ["Statement"],
-  "TryStatement":        ["Statement"],
-  "WhileStatement":      ["Statement", "Loop", "While"],
-  "WithStatement":       ["Statement"],
-  "EmptyStatement":      ["Statement"],
-  "LabeledStatement":    ["Statement"],
-  "VariableDeclaration": ["Statement", "Declaration"],
-  "ExportDeclaration":   ["Statement", "Declaration"],
-  "ImportDeclaration":   ["Statement", "Declaration"],
-  "PrivateDeclaration":  ["Statement", "Declaration"],
-
-  "ArrowFunctionExpression": ["Scope", "Function", "Expression"],
-  "FunctionDeclaration":     ["Statement", "Declaration", "Scope", "Function"],
-  "FunctionExpression":      ["Scope", "Function", "Expression"],
-
-  "BlockStatement": ["Statement", "Scope"],
-  "Program":        ["Scope"],
-  "CatchClause":    ["Scope"],
-
-  "LogicalExpression": ["Binary", "Expression"],
-  "BinaryExpression":  ["Binary", "Expression"],
-
-  "UnaryExpression": ["UnaryLike", "Expression"],
-  "SpreadProperty":  ["UnaryLike"],
-  "SpreadElement":   ["UnaryLike"],
-
-  "ClassDeclaration": ["Statement", "Declaration", "Class"],
-  "ClassExpression":  ["Class", "Expression"],
-
-  "ForOfStatement": ["Statement", "For", "Scope", "Loop"],
-  "ForInStatement": ["Statement", "For", "Scope", "Loop"],
-  "ForStatement":   ["Statement", "For", "Scope", "Loop"],
-
-  "ObjectPattern":     ["Pattern"],
-  "ArrayPattern":      ["Pattern"],
-  "AssignmentPattern": ["Pattern"],
-
-  "Property": ["UserWhitespacable"],
-  "JSXElement": ["UserWhitespacable", "Expression"],
-
-  "ArrayExpression": ["Expression"],
-  "AssignmentExpression": ["Expression"],
-  "AwaitExpression": ["Expression"],
-  "BindFunctionExpression": ["Expression"],
-  "BindMemberExpression": ["Expression"],
-  "CallExpression": ["Expression"],
-  "ComprehensionExpression": ["Expression", "Scope"],
-  "ConditionalExpression": ["Expression"],
-  "Identifier": ["Expression"],
-  "Literal": ["Expression"],
-  "MemberExpression": ["Expression"],
-  "NewExpression": ["Expression"],
-  "ObjectExpression": ["Expression"],
-  "SequenceExpression": ["Expression"],
-  "TaggedTemplateExpression": ["Expression"],
-  "ThisExpression": ["Expression"],
-  "UpdateExpression": ["Expression"],
-  "VirtualPropertyExpression": ["Expression"],
-  "JSXEmptyExpression": ["Expression"],
-  "JSXMemberExpression": ["Expression"],
-  "YieldExpression": ["Expression"]
-}

lib/6to5/types/builder-keys.json

@@ -1,33 +0,0 @@
-{
-  "ArrayExpression":         ["elements"],
-  "ArrowFunctionExpression": ["params", "body"],
-  "AssignmentExpression":    ["operator", "left", "right"],
-  "BinaryExpression":        ["operator", "left", "right"],
-  "BlockStatement":          ["body"],
-  "CallExpression":          ["callee", "arguments"],
-  "ConditionalExpression":   ["test", "consequent", "alternate"],
-  "ExpressionStatement":     ["expression"],
-  "File":                    ["program", "comments", "tokens"],
-  "FunctionExpression":      ["id", "params", "body", "generator"],
-  "FunctionDeclaration":     ["id", "params", "body", "generator"],
-  "Identifier":              ["name"],
-  "IfStatement":             ["test", "consequent", "alternate"],
-  "ImportDeclaration":       ["specifiers", "source"],
-  "ImportSpecifier":         ["id", "name"],
-  "Literal":                 ["value"],
-  "LogicalExpression":       ["operator", "left", "right"],
-  "MemberExpression":        ["object", "property", "computed"],
-  "MethodDefinition":        ["key", "value", "computed", "kind"],
-  "NewExpression":           ["callee", "arguments"],
-  "ObjectExpression":        ["properties"],
-  "Program":                 ["body"],
-  "Property":                ["kind", "key", "value", "computed"],
-  "ReturnStatement":         ["argument"],
-  "SequenceExpression":      ["expressions"],
-  "ThrowExpression":         ["argument"],
-  "UnaryExpression":         ["operator", "argument", "prefix"],
-  "VariableDeclaration":     ["kind", "declarations"],
-  "VariableDeclarator":      ["id", "init"],
-  "WithStatement":           ["object", "body"],
-  "YieldExpression":         ["argument", "delegate"]
-}

lib/6to5/types/node.js

@@ -1,12 +0,0 @@
-"use strict";
-
-module.exports = Node;
-
-var acorn = require("acorn-6to5");
-
-var oldNode = acorn.Node;
-acorn.Node = Node;
-
-function Node() {
-  oldNode.apply(this);
-}

lib/6to5/util.js

@@ -1,265 +0,0 @@
-"use strict";
-
-require("./patch");
-
-var estraverse = require("estraverse");
-var codeFrame  = require("./helpers/code-frame");
-var traverse   = require("./traverse");
-var acorn      = require("acorn-6to5");
-var path       = require("path");
-var util       = require("util");
-var fs         = require("fs");
-var t          = require("./types");
-var _          = require("lodash");
-
-exports.inherits = util.inherits;
-
-exports.canCompile = function (filename, altExts) {
-  var exts = altExts || exports.canCompile.EXTENSIONS;
-  var ext = path.extname(filename);
-  return _.contains(exts, ext);
-};
-
-exports.canCompile.EXTENSIONS = [".js", ".jsx", ".es6", ".es"];
-
-exports.isInteger = function (i) {
-  return _.isNumber(i) && i % 1 === 0;
-};
-
-exports.resolve = function (loc) {
-  try {
-    return require.resolve(loc);
-  } catch (err) {
-    return null;
-  }
-};
-
-exports.trimRight = function (str) {
-  return str.replace(/[\n\s]+$/g, "");
-};
-
-exports.list = function (val) {
-  return val ? val.split(",") : [];
-};
-
-exports.regexify = function (val) {
-  if (!val) return new RegExp(/.^/);
-  if (Array.isArray(val)) val = val.join("|");
-  if (_.isString(val)) return new RegExp(val);
-  if (_.isRegExp(val)) return val;
-  throw new TypeError("illegal type for regexify");
-};
-
-exports.arrayify = function (val) {
-  if (!val) return [];
-  if (_.isString(val)) return exports.list(val);
-  if (Array.isArray(val)) return val;
-  throw new TypeError("illegal type for arrayify");
-};
-
-exports.isAbsolute = function (loc) {
-  if (!loc) return false;
-  if (loc[0] === "/") return true; // unix
-  if (loc[1] === ":" && loc[2] === "\\") return true; // windows
-  return false;
-};
-
-exports.sourceMapToComment = function (map) {
-  var json = JSON.stringify(map);
-  var base64 = new Buffer(json).toString("base64");
-  return "//# sourceMappingURL=data:application/json;base64," + base64;
-};
-
-exports.pushMutatorMap = function (mutatorMap, key, kind, computed, method) {
-  var alias;
-
-  if (t.isIdentifier(key)) {
-    alias = key.name;
-    if (computed) alias = "computed:" + alias;
-  } else if (t.isLiteral(key)) {
-    alias = String(key.value);
-  } else {
-    alias = JSON.stringify(traverse.removeProperties(_.cloneDeep(key)));
-  }
-
-  var map;
-  if (_.has(mutatorMap, alias)) {
-    map = mutatorMap[alias];
-  } else {
-    map = {};
-  }
-  mutatorMap[alias] = map;
-
-  map._key = key;
-  if (computed) {
-    map._computed = true;
-  }
-
-  map[kind] = method;
-};
-
-exports.buildDefineProperties = function (mutatorMap) {
-  var objExpr = t.objectExpression([]);
-
-  _.each(mutatorMap, function (map) {
-    var mapNode = t.objectExpression([]);
-
-    var propNode = t.property("init", map._key, mapNode, map._computed);
-
-    if (!map.get && !map.set) {
-      map.writable = t.literal(true);
-    }
-
-    map.enumerable = t.literal(true);
-    map.configurable = t.literal(true);
-
-    _.each(map, function (node, key) {
-      if (key[0] === "_") return;
-
-      node = _.clone(node);
-      var inheritNode = node;
-      if (t.isMethodDefinition(node)) node = node.value;
-
-      var prop = t.property("init", t.identifier(key), node);
-      t.inheritsComments(prop, inheritNode);
-      t.removeComments(inheritNode);
-      mapNode.properties.push(prop);
-    });
-
-    objExpr.properties.push(propNode);
-  });
-
-  return objExpr;
-};
-
-var templateVisitor = {
-  enter: function (node, parent, scope, context, nodes) {
-    if (t.isIdentifier(node) && _.has(nodes, node.name)) {
-      return nodes[node.name];
-    }
-  }
-};
-
-exports.template = function (name, nodes, keepExpression) {
-  var template = exports.templates[name];
-  if (!template) throw new ReferenceError("unknown template " + name);
-
-  if (nodes === true) {
-    keepExpression = true;
-    nodes = null;
-  }
-
-  template = _.cloneDeep(template);
-
-  if (!_.isEmpty(nodes)) {
-    traverse(template, templateVisitor, null, nodes);
-  }
-
-  var node = template.body[0];
-
-  if (!keepExpression && t.isExpressionStatement(node)) {
-    return node.expression;
-  } else {
-    return node;
-  }
-};
-
-exports.repeat = function (width, cha) {
-  cha = cha || " ";
-
-  var result = "";
-  for (var i = 0; i < width; i++) {
-    result += cha;
-  }
-
-  return result;
-};
-
-exports.normaliseAst = function (ast, comments, tokens) {
-  if (ast && ast.type === "Program") {
-    return t.file(ast, comments || [], tokens || []);
-  } else {
-    throw new Error("Not a valid ast?");
-  }
-};
-
-exports.parse = function (opts, code, callback) {
-  try {
-    var comments = [];
-    var tokens   = [];
-
-    var ast = acorn.parse(code, {
-      allowImportExportEverywhere: opts.allowImportExportEverywhere,
-      allowReturnOutsideFunction:  true,
-      ecmaVersion:                 opts.experimental ? 7 : 6,
-      playground:                  opts.playground,
-      strictMode:                  true,
-      onComment:                   comments,
-      locations:                   true,
-      onToken:                     tokens,
-      ranges:                      true
-    });
-
-    estraverse.attachComments(ast, comments, tokens);
-
-    ast = exports.normaliseAst(ast, comments, tokens);
-
-    if (callback) {
-      return callback(ast);
-    } else {
-      return ast;
-    }
-  } catch (err) {
-    if (!err._6to5) {
-      err._6to5 = true;
-      var message = opts.filename + ": " + err.message;
-
-      var loc = err.loc;
-      if (loc) {
-        var frame = codeFrame(code, loc.line, loc.column + 1);
-        message += frame;
-      }
-
-      if (err.stack) err.stack = err.stack.replace(err.message, message);
-      err.message = message;
-    }
-
-    throw err;
-  }
-};
-
-exports.parseTemplate = function (loc, code) {
-  var ast = exports.parse({ filename: loc }, code).program;
-  return traverse.removeProperties(ast);
-};
-
-var loadTemplates = function () {
-  var templates = {};
-
-  var templatesLoc = __dirname + "/transformation/templates";
-  if (!fs.existsSync(templatesLoc)) {
-    throw new Error("no templates directory - this is most likely the " +
-                    "result of a broken `npm publish`. Please report to " +
-                    "https://github.com/6to5/6to5/issues");
-  }
-
-  _.each(fs.readdirSync(templatesLoc), function (name) {
-    if (name[0] === ".") return;
-
-    var key  = path.basename(name, path.extname(name));
-    var loc  = templatesLoc + "/" + name;
-    var code = fs.readFileSync(loc, "utf8");
-
-    templates[key] = exports.parseTemplate(loc, code);
-  });
-
-  return templates;
-};
-
-try {
-  exports.templates = require("../../templates.json");
-} catch (err) {
-  if (err.code !== "MODULE_NOT_FOUND") throw err;
-
-  exports.templates = loadTemplates();
-}

lib/babel/api/browser.js

@@ -1,8 +1,8 @@
 "use strict";
 
-var transform = module.exports = require("./transformation/transform");
+var transform = module.exports = require("../transformation");
 
-transform.version = require("../../package").version;
+transform.version = require("../../../package").version;
 
 transform.transform = transform;
 
@@ -38,7 +38,7 @@ transform.load = function (url, callback, opts, hold) {
 
 var runScripts = function () {
   var scripts = [];
-  var types   = ["text/ecmascript-6", "text/6to5", "module"];
+  var types   = ["text/ecmascript-6", "text/6to5", "text/babel", "module"];
   var index   = 0;
 
   var exec = function () {

lib/babel/api/node.js

@@ -1,33 +1,35 @@
 "use strict";
 
-var transform = require("./transformation/transform");
-var util      = require("./util");
-var fs        = require("fs");
-var _         = require("lodash");
+var isFunction = require("lodash/lang/isFunction");
+var transform  = require("../transformation");
+var util       = require("../util");
+var fs         = require("fs");
 
-exports.version = require("../../package").version;
+exports.version = require("../../../package").version;
 
-exports.types = require("./types");
+exports.buildExternalHelpers = require("../build-external-helpers");
+
+exports.types = require("../types");
 
 exports.register = function (opts) {
-  var register = require("./register");
+  var register = require("./register/node");
   if (opts != null) register(opts);
   return register;
 };
 
 exports.polyfill = function () {
-  require("./polyfill");
+  require("../polyfill");
 };
 
 exports.canCompile = util.canCompile;
 
-// do not use this - this is for use by official maintained 6to5 plugins
+// do not use this - this is for use by official maintained babel plugins
 exports._util = util;
 
 exports.transform = transform;
 
 exports.transformFile = function (filename, opts, callback) {
-  if (_.isFunction(opts)) {
+  if (isFunction(opts)) {
     callback = opts;
     opts = {};
   }

lib/babel/api/register/browser.js

@@ -0,0 +1,7 @@
+"use strict";
+
+// required to safely use babel/register within a browserify codebase
+
+module.exports = function () {};
+
+require("../../polyfill");

lib/babel/api/register/cache.js

@@ -4,7 +4,7 @@ var path = require("path");
 var os   = require("os");
 var fs   = require("fs");
 
-var FILENAME = path.join(os.tmpdir(), "6to5.json");
+var FILENAME = process.env.BABEL_CACHE_PATH || path.join(os.tmpdir(), "babel.json");
 var data = {};
 
 exports.save = function () {
@@ -12,13 +12,7 @@ exports.save = function () {
 };
 
 exports.load = function () {
-  if (!fs.existsSync(FILENAME)) return;
-
-  try {
-    data = JSON.parse(fs.readFileSync(FILENAME));
-  } catch (err) {
-    return;
-  }
+  if (process.env.BABEL_DISABLE_CACHE) return;
 
   process.on("exit", exports.save);
 
@@ -29,6 +23,14 @@ exports.load = function () {
   };
 
   process.on("SIGINT", sigint);
+
+  if (!fs.existsSync(FILENAME)) return;
+
+  try {
+    data = JSON.parse(fs.readFileSync(FILENAME));
+  } catch (err) {
+    return;
+  }
 };
 
 exports.get = function () {

lib/babel/api/register/node.js

@@ -0,0 +1,152 @@
+"use strict";
+
+require("../../polyfill");
+
+var sourceMapSupport = require("source-map-support");
+var registerCache    = require("./cache");
+var extend           = require("lodash/object/extend");
+var babel            = require("../node");
+var each             = require("lodash/collection/each");
+var util             = require("../../util");
+var fs               = require("fs");
+
+sourceMapSupport.install({
+  retrieveSourceMap: function (source) {
+    var map = maps && maps[source];
+    if (map) {
+      return {
+        url: null,
+        map: map
+      };
+    } else {
+      return null;
+    }
+  }
+});
+
+//
+
+registerCache.load();
+var cache = registerCache.get();
+
+//
+
+var transformOpts = {};
+var ignoreRegex   = /node_modules/;
+var onlyRegex;
+var exts          = {};
+var maps          = {};
+
+var mtime = function (filename) {
+  return +fs.statSync(filename).mtime;
+};
+
+var compile = function (filename) {
+  var result;
+
+  var cacheKey = filename + ":" + JSON.stringify(transformOpts);
+
+  if (cache) {
+    var cached = cache[cacheKey];
+    if (cached && cached.mtime === mtime(filename)) {
+      result = cached;
+    }
+  }
+
+  if (!result) {
+    result = babel.transformFileSync(filename, extend({
+      sourceMap: true,
+      ast:       false
+    }, transformOpts));
+  }
+
+  if (cache) {
+    result.mtime = mtime(filename);
+    cache[cacheKey] = result;
+  }
+
+  maps[filename] = result.map;
+
+  return result.code;
+};
+
+var shouldIgnore = function (filename) {
+  return (ignoreRegex && ignoreRegex.test(filename)) || (onlyRegex && !onlyRegex.test(filename));
+};
+
+var istanbulMonkey = {};
+
+if (process.env.running_under_istanbul) { // jshint ignore:line
+  // we need to monkey patch fs.readFileSync so we can hook into
+  // what istanbul gets, it's extremely dirty but it's the only way
+  var _readFileSync = fs.readFileSync;
+
+  fs.readFileSync = function (filename) {
+    if (istanbulMonkey[filename]) {
+      delete istanbulMonkey[filename];
+      var code = compile(filename);
+      istanbulMonkey[filename] = true;
+      return code;
+    } else {
+      return _readFileSync.apply(this, arguments);
+    }
+  };
+}
+
+var istanbulLoader = function (m, filename, old) {
+  istanbulMonkey[filename] = true;
+  old(m, filename);
+};
+
+var normalLoader = function (m, filename) {
+  m._compile(compile(filename), filename);
+};
+
+var registerExtension = function (ext) {
+  var old = require.extensions[ext];
+
+  var loader = normalLoader;
+  if (process.env.running_under_istanbul) loader = istanbulLoader; // jshint ignore:line
+
+  require.extensions[ext] = function (m, filename) {
+    if (shouldIgnore(filename)) {
+      old(m, filename);
+    } else {
+      loader(m, filename, old);
+    }
+  };
+};
+
+var hookExtensions = function (_exts) {
+  each(exts, function (old, ext) {
+    require.extensions[ext] = old;
+  });
+
+  exts = {};
+
+  each(_exts, function (ext) {
+    exts[ext] = require.extensions[ext];
+    registerExtension(ext);
+  });
+};
+
+hookExtensions(util.canCompile.EXTENSIONS);
+
+module.exports = function (opts) {
+  // normalize options
+  opts = opts || {};
+
+  if (opts.only != null) onlyRegex = util.regexify(opts.only);
+  if (opts.ignore != null) ignoreRegex = util.regexify(opts.ignore);
+
+  if (opts.extensions) hookExtensions(util.arrayify(opts.extensions));
+
+  if (opts.cache === false) cache = null;
+
+  delete opts.extensions;
+  delete opts.ignore;
+  delete opts.cache;
+  delete opts.only;
+
+  extend(transformOpts, opts);
+};

lib/babel/build-external-helpers.js

@@ -0,0 +1,25 @@
+"use strict";
+
+var buildHelpers = require("./build-helpers");
+var generator    = require("./generation");
+var util         = require("./util");
+var t            = require("./types");
+
+module.exports = function () {
+  var namespace = t.identifier("babelHelpers");
+
+  var body      = [];
+  var container = t.functionExpression(null, [t.identifier("global")], t.blockStatement(body));
+  var tree      = t.program([t.expressionStatement(t.callExpression(container, [util.template("self-global")]))]);
+
+  body.push(t.variableDeclaration("var", [
+    t.variableDeclarator(
+      namespace,
+      t.assignmentExpression("=", t.memberExpression(t.identifier("global"), namespace), t.objectExpression([]))
+    )
+  ]));
+
+  buildHelpers(body, namespace);
+
+  return generator(tree).code;
+};

lib/babel/build-helpers.js

@@ -0,0 +1,13 @@
+var File = require("./transformation/file");
+var util = require("./util");
+var each = require("lodash/collection/each");
+var t    = require("./types");
+
+module.exports = function (body, namespace) {
+  each(File.helpers, function (name) {
+    var key = t.identifier(t.toIdentifier(name));
+    body.push(t.expressionStatement(
+      t.assignmentExpression("=", t.memberExpression(namespace, key), util.template(name))
+    ));
+  });
+};

lib/babel/detection/index.js

@@ -0,0 +1,29 @@
+module.exports = detect;
+
+var SYNTAX_KEYS = require("./syntax-keys");
+var traverse    = require("../traversal");
+var visitors    = traverse.explode(require("./visitors"));
+
+function detect(ast) {
+  var stats = {
+    syntax: {},
+    builtins: {}
+  };
+
+  var detectedSyntax = function (name) {
+    stats.syntax[name] = true;
+  };
+
+  traverse(ast, {
+    enter: function (node, parent) {
+      if (SYNTAX_KEYS[node.type]) {
+        detectedSyntax(SYNTAX_KEYS[node.type]);
+      }
+
+      var visitor = visitors[node.type];
+      if (visitor) visitor(node, parent, detectedSyntax);
+    }
+  });
+
+  return stats;
+}

lib/babel/detection/syntax-keys.json

@@ -0,0 +1,84 @@
+{
+  "ArrowFunctionExpression":   "es6.arrowFunctions",
+
+  "AwaitExpression":           "es7.asyncFunctions",
+
+  "ClassBody":                 "es6.classes",
+  "ClassDeclaration":          "es6.classes",
+  "ClassExpression":           "es6.classes",
+  "MethodDefinition":          "es6.classes",
+
+  "ComprehensionBlock":        "es7.comprehensions",
+  "ComprehensionExpression":   "es7.comprehensions",
+
+  "ForOfStatement":            "es6.forOf",
+
+  "ExportBatchSpecifier":      "es6.modules",
+  "ExportDeclaration":         "es6.modules",
+  "ExportSpecifier":           "es6.modules",
+  "ImportBatchSpecifier":      "es6.modules",
+  "ImportDeclaration":         "es6.modules",
+  "ImportSpecifier":           "es6.modules",
+
+  "ArrayPattern":              "es6.destructuring",
+  "AssignmentPattern":         "es6.destructuring",
+  "ObjectPattern":             "es6.destructuring",
+
+  "RestElement":               "es6.parameters.rest",
+
+  "SpreadElement":             "es6.spread",
+
+  "SpreadProperty":            "es7.objectSpread",
+
+  "TaggedTemplateExpression":  "es6.templateLiterals",
+  "TemplateElement":           "es6.templateLiterals",
+  "TemplateLiteral":           "es6.templateLiterals",
+
+  "VirtualPropertyExpression": "es7.abstractReferences",
+  "PrivateDeclaration":        "es7.abstractReferences",
+
+  "YieldExpression":           "es6.generators",
+
+  "AnyTypeAnnotation":           "flow",
+  "ArrayTypeAnnotation":         "flow",
+  "BooleanTypeAnnotation":       "flow",
+  "ClassProperty":               "flow",
+  "DeclareClass":                "flow",
+  "DeclareFunction":             "flow",
+  "DeclareModule":               "flow",
+  "DeclareVariable":             "flow",
+  "FunctionTypeAnnotation":      "flow",
+  "FunctionTypeParam":           "flow",
+  "GenericTypeAnnotation":       "flow",
+  "InterfaceExtends":            "flow",
+  "InterfaceDeclaration":        "flow",
+  "IntersectionTypeAnnotation":  "flow",
+  "NullableTypeAnnotation":      "flow",
+  "NumberTypeAnnotation":        "flow",
+  "StringLiteralTypeAnnotation": "flow",
+  "StringTypeAnnotation":        "flow",
+  "TupleTypeAnnotation":         "flow",
+  "TypeofTypeAnnotation":        "flow",
+  "TypeAlias":                   "flow",
+  "TypeAnnotation":              "flow",
+  "TypeParameterDeclaration":    "flow",
+  "TypeParameterInstantiation":  "flow",
+  "ObjectTypeAnnotation":        "flow",
+  "ObjectTypeCallProperty":      "flow",
+  "ObjectTypeIndexer":           "flow",
+  "ObjectTypeProperty":          "flow",
+  "QualifiedTypeIdentifier":     "flow",
+  "UnionTypeAnnotation":         "flow",
+  "VoidTypeAnnotation":          "flow",
+
+  "JSXAttribute":              "jsx",
+  "JSXClosingElement":         "jsx",
+  "JSXElement":                "jsx",
+  "JSXEmptyExpression":        "jsx",
+  "JSXExpressionContainer":    "jsx",
+  "JSXIdentifier":             "jsx",
+  "JSXMemberExpression":       "jsx",
+  "JSXNamespacedName":         "jsx",
+  "JSXOpeningElement":         "jsx",
+  "JSXSpreadAttribute":        "jsx"
+}

lib/babel/detection/visitors.js

@@ -0,0 +1,54 @@
+var t = require("../types");
+var includes = require("lodash/collection/includes");
+
+exports.AssignmentExpression = function (node, parent, detected) {
+  if (node.operator === "**=") {
+    detected("es6.exponentation");
+  }
+};
+
+exports.BinaryExpression = function (node, parent, detected) {
+  if (node.operator === "**") {
+    detected("es6.exponentation");
+  }
+};
+
+exports.VariableDeclaration = function (node, parent, detected) {
+  if (node.kind === "let" || node.kind === "const") {
+    detected("es6.blockScoping");
+  }
+
+  if (node.kind === "const") {
+    detected("es6.constants");
+  }
+};
+
+exports.Property = function (node, parent, detected) {
+  if (node.shorthand || node.method) {
+    detected("es6.properties.shorthand");
+  }
+
+  if (node.kind === "set" || node.kind === "get") {
+    detected("es5.properties.mutators");
+  }
+
+  if (node.computed) {
+    detected("es6.properties.computed");
+  }
+};
+
+exports.AssignmentPattern = function (node, parent, detected) {
+  if (t.isFunction(parent) && includes(parent.params, node)) {
+    detected("es6.parameters.default");
+  }
+};
+
+exports.Function = function (node, parent, detected) {
+  if (node.generator) {
+    detected("es6.generators");
+  }
+
+  if (node.async) {
+    detected("es7.asyncFunctions");
+  }
+};

lib/babel/generation/buffer.js

@@ -2,8 +2,11 @@
 
 module.exports = Buffer;
 
-var util = require("../util");
-var _    = require("lodash");
+var repeating = require("repeating");
+var trimRight = require("trim-right");
+var isBoolean = require("lodash/lang/isBoolean");
+var includes  = require("lodash/collection/includes");
+var isNumber  = require("lodash/lang/isNumber");
 
 function Buffer(position, format) {
   this.position = position;
@@ -13,14 +16,14 @@ function Buffer(position, format) {
 }
 
 Buffer.prototype.get = function () {
-  return util.trimRight(this.buf);
+  return trimRight(this.buf);
 };
 
 Buffer.prototype.getIndent = function () {
-  if (this.format.compact) {
+  if (this.format.compact || this.format.concise) {
     return "";
   } else {
-    return util.repeat(this._indent, this.format.indent.style);
+    return repeating(this.format.indent.style, this._indent);
   }
 };
 
@@ -51,16 +54,18 @@ Buffer.prototype.rightBrace = function () {
 
 Buffer.prototype.keyword = function (name) {
   this.push(name);
-  this.push(" ");
+  this.space();
 };
 
 Buffer.prototype.space = function () {
-  if (this.buf && !this.isLast([" ", "\n"])) {
+  if (this.format.compact) return;
+  if (this.buf && !this.isLast(" ") && !this.isLast("\n")) {
     this.push(" ");
   }
 };
 
 Buffer.prototype.removeLast = function (cha) {
+  if (this.format.compact) return;
   if (!this.isLast(cha)) return;
 
   this.buf = this.buf.substr(0, this.buf.length - 1);
@@ -68,24 +73,29 @@ Buffer.prototype.removeLast = function (cha) {
 };
 
 Buffer.prototype.newline = function (i, removeLast) {
-  if (this.format.compact) {
+  if (this.format.compact) return;
+
+  if (this.format.concise) {
     this.space();
     return;
   }
 
   removeLast = removeLast || false;
 
-  if (_.isNumber(i)) {
-    if (this.endsWith("{\n")) i--;
-    if (this.endsWith(util.repeat(i, "\n"))) return;
+  if (isNumber(i)) {
+    i = Math.min(2, i);
 
-    while (i--) {
+    if (this.endsWith("{\n") || this.endsWith(":\n")) i--;
+    if (i <= 0) return;
+
+    while (i > 0) {
       this._newline(removeLast);
+      i--;
     }
     return;
   }
 
-  if (_.isBoolean(i)) {
+  if (isBoolean(i)) {
     removeLast = i;
   }
 
@@ -93,11 +103,13 @@ Buffer.prototype.newline = function (i, removeLast) {
 };
 
 Buffer.prototype._newline = function (removeLast) {
+  // never allow more than two lines
+  if (this.endsWith("\n\n")) return;
+
+  // remove the last newline
   if (removeLast && this.isLast("\n")) this.removeLast("\n");
 
   this.removeLast(" ");
-
-  // remove whitespace if last character was a newline
   this._removeSpacesAfterLastNewline();
   this._push("\n");
 };
@@ -105,6 +117,7 @@ Buffer.prototype._newline = function (removeLast) {
 /**
  * If buffer ends with a newline and some spaces after it, trim those spaces.
  */
+
 Buffer.prototype._removeSpacesAfterLastNewline = function () {
   var lastNewlineIndex = this.buf.lastIndexOf("\n");
   if (lastNewlineIndex === -1)
@@ -125,7 +138,7 @@ Buffer.prototype._removeSpacesAfterLastNewline = function () {
 };
 
 Buffer.prototype.push = function (str, noIndent) {
-  if (this._indent && !noIndent && str !== "\n") {
+  if (!this.format.compact && this._indent && !noIndent && str !== "\n") {
     // we have an indent level and we aren't pushing a newline
     var indent = this.getIndent();
 
@@ -133,7 +146,7 @@ Buffer.prototype.push = function (str, noIndent) {
     str = str.replace(/\n/g, "\n" + indent);
 
     // we've got a newline before us so prepend on the indentation
-    if (this.isLast("\n")) str = indent + str;
+    if (this.isLast("\n")) this._push(indent);
   }
 
   this._push(str);
@@ -145,17 +158,17 @@ Buffer.prototype._push = function (str) {
 };
 
 Buffer.prototype.endsWith = function (str) {
-  var d = this.buf.length - str.length;
-  return d >= 0 && this.buf.lastIndexOf(str) === d;
+  return this.buf.slice(-str.length) === str;
 };
 
-Buffer.prototype.isLast = function (cha, trimRight) {
+Buffer.prototype.isLast = function (cha) {
+  if (this.format.compact) return false;
+
   var buf = this.buf;
-  if (trimRight) buf = util.trimRight(buf);
   var last = buf[buf.length - 1];
 
   if (Array.isArray(cha)) {
-    return _.contains(cha, last);
+    return includes(cha, last);
   } else {
     return cha === last;
   }

lib/babel/generation/generators/expressions.js

@@ -1,8 +1,8 @@
 "use strict";
 
-var util = require("../../util");
-var t    = require("../../types");
-var _    = require("lodash");
+var isInteger = require("is-integer");
+var isNumber  = require("lodash/lang/isNumber");
+var t         = require("../../types");
 
 exports.UnaryExpression = function (node, print) {
   var hasSpace = /[a-z]$/.test(node.operator);
@@ -17,7 +17,7 @@ exports.UnaryExpression = function (node, print) {
   }
 
   this.push(node.operator);
-  if (hasSpace) this.space();
+  if (hasSpace) this.push(" ");
   print(node.argument);
 };
 
@@ -33,24 +33,26 @@ exports.UpdateExpression = function (node, print) {
 
 exports.ConditionalExpression = function (node, print) {
   print(node.test);
-  this.push(" ? ");
+  this.space();
+  this.push("?");
+  this.space();
   print(node.consequent);
-  this.push(" : ");
+  this.space();
+  this.push(":");
+  this.space();
   print(node.alternate);
 };
 
 exports.NewExpression = function (node, print) {
   this.push("new ");
   print(node.callee);
-  if (node.arguments.length || this.format.parentheses) {
-    this.push("(");
-    print.join(node.arguments, { separator: ", " });
-    this.push(")");
-  }
+  this.push("(");
+  print.list(node.arguments);
+  this.push(")");
 };
 
 exports.SequenceExpression = function (node, print) {
-  print.join(node.expressions, { separator: ", " });
+  print.list(node.expressions);
 };
 
 exports.ThisExpression = function () {
@@ -72,9 +74,7 @@ exports.CallExpression = function (node, print) {
     separator += " ";
   }
 
-  print.join(node.arguments, {
-    separator: separator
-  });
+  print.list(node.arguments, { separator: separator });
 
   if (node._prettyCall) {
     this.newline();
@@ -87,7 +87,11 @@ exports.CallExpression = function (node, print) {
 var buildYieldAwait = function (keyword) {
   return function (node, print) {
     this.push(keyword);
-    if (node.delegate) this.push("*");
+
+    if (node.delegate || node.all) {
+      this.push("*");
+    }
+
     if (node.argument) {
       this.space();
       print(node.argument);
@@ -111,10 +115,11 @@ exports.BinaryExpression =
 exports.LogicalExpression =
 exports.AssignmentPattern =
 exports.AssignmentExpression = function (node, print) {
+  // todo: add cases where the spaces can be dropped when in compact mode
   print(node.left);
-  this.space();
+  this.push(" ");
   this.push(node.operator);
-  this.space();
+  this.push(" ");
   print(node.right);
 };
 
@@ -129,7 +134,7 @@ exports.MemberExpression = function (node, print) {
   }
 
   var computed = node.computed;
-  if (t.isLiteral(node.property) && _.isNumber(node.property.value)) {
+  if (t.isLiteral(node.property) && isNumber(node.property.value)) {
     computed = true;
   }
 
@@ -139,7 +144,7 @@ exports.MemberExpression = function (node, print) {
     this.push("]");
   } else {
     // 5..toFixed(2);
-    if (t.isLiteral(obj) && util.isInteger(obj.value) && !SCIENTIFIC_NOTATION.test(obj.value.toString())) {
+    if (t.isLiteral(obj) && isInteger(obj.value) && !SCIENTIFIC_NOTATION.test(obj.value.toString())) {
       this.push(".");
     }
 

lib/babel/generation/generators/flow.js

@@ -30,6 +30,7 @@ exports.ObjectTypeIndexer =
 exports.ObjectTypeProperty =
 exports.QualifiedTypeIdentifier =
 exports.UnionTypeAnnotation =
+exports.TypeCastExpression =
 exports.VoidTypeAnnotation = function () {
   // todo: implement these once we have a `--keep-types` option
 };

lib/babel/generation/generators/jsx.js

@@ -1,7 +1,7 @@
 "use strict";
 
-var t = require("../../types");
-var _ = require("lodash");
+var t    = require("../../types");
+var each = require("lodash/collection/each");
 
 exports.JSXAttribute = function (node, print) {
   print(node.name);
@@ -47,7 +47,7 @@ exports.JSXElement = function (node, print) {
   if (open.selfClosing) return;
 
   this.indent();
-  _.each(node.children, function (child) {
+  each(node.children, function (child) {
     if (t.isLiteral(child)) {
       self.push(child.value);
     } else {
@@ -75,6 +75,4 @@ exports.JSXClosingElement = function (node, print) {
   this.push(">");
 };
 
-exports.JSXEmptyExpression = function () {
-
-};
+exports.JSXEmptyExpression = function () {};

lib/babel/generation/generators/methods.js

@@ -4,11 +4,7 @@ var t = require("../../types");
 
 exports._params = function (node, print) {
   this.push("(");
-
-  print.join(node.params, {
-    separator: ", "
-  });
-
+  print.list(node.params);
   this.push(")");
 };
 
@@ -45,11 +41,14 @@ exports.FunctionExpression = function (node, print) {
   if (node.async) this.push("async ");
   this.push("function");
   if (node.generator) this.push("*");
-  this.push(" ");
+
   if (node.id) {
-    this.space();
+    this.push(" ");
     print(node.id);
+  } else {
+    this.space();
   }
+
   this._params(node, print);
   this.space();
   print(node.body);

lib/babel/generation/generators/modules.js

@@ -1,7 +1,7 @@
 "use strict";
 
-var t = require("../../types");
-var _ = require("lodash");
+var t    = require("../../types");
+var each = require("lodash/collection/each");
 
 exports.ImportSpecifier = function (node, print) {
   if (t.isSpecifierDefault(node)) {
@@ -62,11 +62,15 @@ exports.ImportDeclaration = function (node, print) {
 
   this.push("import ");
 
+  if (node.isType) {
+    this.push("type ");
+  }
+
   var specfiers = node.specifiers;
   if (specfiers && specfiers.length) {
     var foundImportSpecifier = false;
 
-    _.each(node.specifiers, function (spec, i) {
+    each(node.specifiers, function (spec, i) {
       if (+i > 0) {
         self.push(", ");
       }

lib/babel/generation/generators/playground.js

@@ -1,8 +1,8 @@
 "use strict";
 
-var _ = require("lodash");
+var each = require("lodash/collection/each");
 
-_.each(["BindMemberExpression", "BindFunctionExpression"], function (type) {
+each(["BindMemberExpression", "BindFunctionExpression"], function (type) {
   exports[type] = function () {
     throw new ReferenceError("Trying to render non-standard playground node " + JSON.stringify(type));
   };

lib/babel/generation/generators/statements.js

@@ -1,7 +1,7 @@
 "use strict";
 
-var util = require("../../util");
-var t    = require("../../types");
+var repeating = require("repeating");
+var t         = require("../../types");
 
 exports.WithStatement = function (node, print) {
   this.keyword("with");
@@ -21,8 +21,8 @@ exports.IfStatement = function (node, print) {
   print.indentOnComments(node.consequent);
 
   if (node.alternate) {
-    if (this.isLast("}")) this.push(" ");
-    this.keyword("else");
+    if (this.isLast("}")) this.space();
+    this.push("else ");
     print.indentOnComments(node.alternate);
   }
 };
@@ -148,7 +148,14 @@ exports.SwitchStatement = function (node, print) {
   this.push(")");
   this.space();
   this.push("{");
-  print.sequence(node.cases, { indent: true });
+
+  print.sequence(node.cases, {
+    indent: true,
+    addNewlines: function (leading, cas) {
+      if (!leading && node.cases[node.cases.length - 1] === cas) return -1;
+    }
+  });
+
   this.push("}");
 };
 
@@ -161,8 +168,10 @@ exports.SwitchCase = function (node, print) {
     this.push("default:");
   }
 
-  this.newline();
-  print.sequence(node.consequent, { indent: true });
+  if (node.consequent.length) {
+    this.newline();
+    print.sequence(node.consequent, { indent: true });
+  }
 };
 
 exports.DebuggerStatement = function () {
@@ -184,13 +193,13 @@ exports.VariableDeclaration = function (node, print, parent) {
   }
 
   var sep = ",";
-  if (hasInits) {
-    sep += "\n" + util.repeat(node.kind.length + 1);
+  if (!this.format.compact && hasInits) {
+    sep += "\n" + repeating(" ", node.kind.length + 1);
   } else {
     sep += " ";
   }
 
-  print.join(node.declarations, { separator: sep });
+  print.list(node.declarations, { separator: sep });
 
   if (!t.isFor(parent)) {
     this.semicolon();

lib/babel/generation/generators/template-literals.js

@@ -1,6 +1,6 @@
 "use strict";
 
-var _ = require("lodash");
+var each = require("lodash/collection/each");
 
 exports.TaggedTemplateExpression = function (node, print) {
   print(node.tag);
@@ -18,7 +18,7 @@ exports.TemplateLiteral = function (node, print) {
   var self   = this;
   var len    = quasis.length;
 
-  _.each(quasis, function (quasi, i) {
+  each(quasis, function (quasi, i) {
     print(quasi);
 
     if (i + 1 < len) {

lib/babel/generation/generators/types.js

@@ -1,6 +1,6 @@
 "use strict";
 
-var _ = require("lodash");
+var each = require("lodash/collection/each");
 
 exports.Identifier = function (node) {
   this.push(node.name);
@@ -27,7 +27,7 @@ exports.ObjectPattern = function (node, print) {
     this.push("{");
     this.space();
 
-    print.join(props, { separator: ", ", indent: true });
+    print.list(props, { indent: true });
 
     this.space();
     this.push("}");
@@ -49,7 +49,8 @@ exports.Property = function (node, print) {
       if (node.shorthand) return;
     }
 
-    this.push(": ");
+    this.push(":");
+    this.space();
     print(node.value);
   }
 };
@@ -62,7 +63,7 @@ exports.ArrayPattern = function (node, print) {
 
   this.push("[");
 
-  _.each(elems, function (elem, i) {
+  each(elems, function (elem, i) {
     if (!elem) {
       // If the array expression ends with a hole, that hole
       // will be ignored by the interpreter, but if it ends with
@@ -93,8 +94,10 @@ exports.Literal = function (node) {
     });
 
     this.push(val);
-  } else if (type === "boolean" || type === "number") {
-    this.push(JSON.stringify(val));
+  } else if (type === "number") {
+    this.push(val + "");
+  } else if (type === "boolean") {
+    this.push(val ? "true" : "false");
   } else if (node.regex) {
     this.push("/" + node.regex.pattern + "/" + node.regex.flags);
   } else if (val === null) {

lib/babel/generation/index.js

@@ -9,49 +9,63 @@ module.exports.CodeGenerator = CodeGenerator;
 
 var detectIndent = require("detect-indent");
 var Whitespace   = require("./whitespace");
+var repeating    = require("repeating");
 var SourceMap    = require("./source-map");
 var Position     = require("./position");
+var messages     = require("../messages");
 var Buffer       = require("./buffer");
-var util         = require("../util");
+var extend       = require("lodash/object/extend");
+var each         = require("lodash/collection/each");
 var n            = require("./node");
 var t            = require("../types");
-var _            = require("lodash");
 
 function CodeGenerator(ast, opts, code) {
   opts = opts || {};
 
   this.comments = ast.comments || [];
   this.tokens   = ast.tokens || [];
-  this.format   = CodeGenerator.normaliseOptions(code, opts);
+  this.format   = CodeGenerator.normalizeOptions(code, opts);
+  this.opts     = opts;
   this.ast      = ast;
 
-  this.whitespace = new Whitespace(this.tokens, this.comments);
+  this.whitespace = new Whitespace(this.tokens, this.comments, this.format);
   this.position   = new Position;
   this.map        = new SourceMap(this.position, opts, code);
   this.buffer     = new Buffer(this.position, this.format);
 }
 
-_.each(Buffer.prototype, function (fn, key) {
+each(Buffer.prototype, function (fn, key) {
   CodeGenerator.prototype[key] = function () {
     return fn.apply(this.buffer, arguments);
   };
 });
 
-CodeGenerator.normaliseOptions = function (code, opts) {
-  var indent = detectIndent(code);
-  var style  = indent.indent;
-  if (!style || style === " ") style = "  ";
+CodeGenerator.normalizeOptions = function (code, opts) {
+  var style = "  ";
+  if (code) {
+    var indent = detectIndent(code).indent;
+    if (indent && indent !== " ") style = indent;
+  }
 
-  return _.merge({
-    parentheses: true,
+  var format = {
     comments: opts.comments == null || opts.comments,
-    compact: false,
+    compact: opts.compact,
     indent: {
       adjustMultilineComment: true,
       style: style,
       base: 0
     }
-  }, opts.format || {});
+  };
+
+  if (format.compact === "auto") {
+    format.compact = code.length > 100000; // 100KB
+
+    if (format.compact) {
+      console.error(messages.get("codeGeneratorDeopt", opts.filename, "100KB"));
+    }
+  }
+
+  return format;
 };
 
 CodeGenerator.generators = {
@@ -69,8 +83,8 @@ CodeGenerator.generators = {
   jsx:              require("./generators/jsx")
 };
 
-_.each(CodeGenerator.generators, function (generator) {
-  _.extend(CodeGenerator.prototype, generator);
+each(CodeGenerator.generators, function (generator) {
+  extend(CodeGenerator.prototype, generator);
 });
 
 CodeGenerator.prototype.generate = function () {
@@ -79,7 +93,7 @@ CodeGenerator.prototype.generate = function () {
   this.print(ast);
 
   var comments = [];
-  _.each(ast.comments, function (comment) {
+  each(ast.comments, function (comment) {
     if (!comment._displayed) comments.push(comment);
   });
   this._printComments(comments);
@@ -107,6 +121,12 @@ CodeGenerator.prototype.buildPrint = function (parent) {
     return self.printJoin(print, nodes, opts);
   };
 
+  print.list = function (items, opts) {
+    opts = opts || {};
+    opts.separator = opts.separator || ", ";
+    print.join(items, opts);
+  };
+
   print.block = function (node) {
     return self.printBlock(print, node);
   };
@@ -125,9 +145,9 @@ CodeGenerator.prototype.print = function (node, parent, opts) {
     node._compact = true;
   }
 
-  var oldCompact = this.format.compact;
+  var oldConcise = this.format.concise;
   if (node._compact) {
-    this.format.compact = true;
+    this.format.concise = true;
   }
 
   var self = this;
@@ -151,13 +171,14 @@ CodeGenerator.prototype.print = function (node, parent, opts) {
     } else {
       // generated node
       if (!leading) lines++; // always include at least a single line after
+      if (opts.addNewlines) lines += opts.addNewlines(leading, node) || 0;
 
       var needs = n.needsWhitespaceAfter;
       if (leading) needs = n.needsWhitespaceBefore;
-      lines += needs(node, parent);
+      if (needs(node, parent)) lines++;
 
       // generated nodes can't add starting file whitespace
-      if (!self.buffer.get()) lines = 0;
+      if (!self.buffer.buf) lines = 0;
     }
 
     self.newline(lines);
@@ -195,7 +216,7 @@ CodeGenerator.prototype.print = function (node, parent, opts) {
     throw new ReferenceError("unknown node of type " + JSON.stringify(node.type) + " with constructor " + JSON.stringify(node && node.constructor.name));
   }
 
-  this.format.compact = oldCompact;
+  this.format.concise = oldConcise;
 };
 
 CodeGenerator.prototype.printJoin = function (print, nodes, opts) {
@@ -208,9 +229,10 @@ CodeGenerator.prototype.printJoin = function (print, nodes, opts) {
 
   if (opts.indent) self.indent();
 
-  _.each(nodes, function (node, i) {
+  each(nodes, function (node, i) {
     print(node, {
       statement: opts.statement,
+      addNewlines: opts.addNewlines,
       after: function () {
         if (opts.iterator) {
           opts.iterator(node, i);
@@ -273,7 +295,7 @@ CodeGenerator.prototype.getComments = function (key, node, parent) {
     nodes.push(node.argument);
   }
 
-  _.each(nodes, function (node) {
+  each(nodes, function (node) {
     comments = comments.concat(self._getComments(key, node));
   });
 
@@ -286,16 +308,17 @@ CodeGenerator.prototype._getComments = function (key, node) {
 
 CodeGenerator.prototype._printComments = function (comments) {
   if (this.format.compact) return;
+
   if (!this.format.comments) return;
   if (!comments || !comments.length) return;
 
   var self = this;
 
-  _.each(comments, function (comment) {
+  each(comments, function (comment) {
     var skip = false;
 
     // find the original comment in the ast and set it as displayed
-    _.each(self.ast.comments, function (origComment) {
+    each(self.ast.comments, function (origComment) {
       if (origComment.start === comment.start) {
         // comment has already been output
         if (origComment._displayed) skip = true;
@@ -328,7 +351,7 @@ CodeGenerator.prototype._printComments = function (comments) {
       }
 
       var indent = Math.max(self.indentSize(), column);
-      val = val.replace(/\n/g, "\n" + util.repeat(indent));
+      val = val.replace(/\n/g, "\n" + repeating(" ", indent));
     }
 
     if (column === 0) {

lib/babel/generation/node/index.js

@@ -4,8 +4,9 @@ module.exports = Node;
 
 var whitespace = require("./whitespace");
 var parens     = require("./parentheses");
+var each       = require("lodash/collection/each");
+var some       = require("lodash/collection/some");
 var t          = require("../../types");
-var _          = require("lodash");
 
 var find = function (obj, node, parent) {
   if (!obj) return;
@@ -41,14 +42,19 @@ Node.needsWhitespace = function (node, parent, type) {
     node = node.expression;
   }
 
-  var lines = find(whitespace[type].nodes, node, parent);
-  if (lines) return lines;
+  var linesInfo = find(whitespace.nodes, node, parent);
 
-  _.each(find(whitespace[type].list, node, parent), function (expr) {
-    lines = Node.needsWhitespace(expr, node, type);
-    if (lines) return false;
-  });
-  return lines || 0;
+  if (!linesInfo) {
+    var items = find(whitespace.list, node, parent);
+    if (items) {
+      for (var i = 0; i < items.length; i++) {
+        linesInfo = Node.needsWhitespace(items[i], node, type);
+        if (linesInfo) break;
+      }
+    }
+  }
+
+  return (linesInfo && linesInfo[type]) || 0;
 };
 
 Node.needsWhitespaceBefore = function (node, parent) {
@@ -65,7 +71,7 @@ Node.needsParens = function (node, parent) {
   if (t.isNewExpression(parent) && parent.callee === node) {
     if (t.isCallExpression(node)) return true;
 
-    var hasCall = _.some(node, function (val) {
+    var hasCall = some(node, function (val) {
       return t.isCallExpression(val);
     });
     if (hasCall) return true;
@@ -94,7 +100,7 @@ Node.needsParensNoLineTerminator = function (node, parent) {
   return false;
 };
 
-_.each(Node, function (fn, key) {
+each(Node, function (fn, key) {
   Node.prototype[key] = function () {
     // Avoid leaking arguments to prevent deoptimization
     var args = new Array(arguments.length + 2);

lib/babel/generation/node/parentheses.js

@@ -1,11 +1,11 @@
 "use strict";
 
-var t = require("../../types");
-var _ = require("lodash");
+var t    = require("../../types");
+var each = require("lodash/collection/each");
 
 var PRECEDENCE = {};
 
-_.each([
+each([
   ["||"],
   ["&&"],
   ["|"],
@@ -18,7 +18,7 @@ _.each([
   ["*", "/", "%"],
   ["**"]
 ], function (tier, i) {
-  _.each(tier, function (op) {
+  each(tier, function (op) {
     PRECEDENCE[op] = i;
   });
 });

lib/babel/generation/node/whitespace.js

@@ -0,0 +1,159 @@
+"use strict";
+
+var isBoolean = require("lodash/lang/isBoolean");
+var each      = require("lodash/collection/each");
+var map       = require("lodash/collection/map");
+var t         = require("../../types");
+
+var crawl = function (node, state) {
+  state = state || {};
+
+  if (t.isMemberExpression(node)) {
+    crawl(node.object, state);
+    if (node.computed) crawl(node.property, state);
+  } else if (t.isBinary(node) || t.isAssignmentExpression(node)) {
+    crawl(node.left, state);
+    crawl(node.right, state);
+  } else if (t.isCallExpression(node)) {
+    state.hasCall = true;
+    crawl(node.callee, state);
+  } else if (t.isFunction(node)) {
+    state.hasFunction = true;
+  } else if (t.isIdentifier(node)) {
+    state.hasHelper = state.hasHelper || isHelper(node.callee);
+  }
+
+  return state;
+};
+
+var isHelper = function (node) {
+  if (t.isMemberExpression(node)) {
+    return isHelper(node.object) || isHelper(node.property);
+  } else if (t.isIdentifier(node)) {
+    return node.name === "require" || node.name[0] === "_";
+  } else if (t.isCallExpression(node)) {
+    return isHelper(node.callee);
+  } else if (t.isBinary(node) || t.isAssignmentExpression(node)) {
+    return (t.isIdentifier(node.left) && isHelper(node.left)) || isHelper(node.right);
+  } else {
+    return false;
+  }
+};
+
+var isType = function (node) {
+  return t.isLiteral(node) || t.isObjectExpression(node) || t.isArrayExpression(node) ||
+         t.isIdentifier(node) || t.isMemberExpression(node);
+};
+
+exports.nodes = {
+  AssignmentExpression: function (node) {
+    var state = crawl(node.right);
+    if ((state.hasCall && state.hasHelper) || state.hasFunction) {
+      return {
+        before: state.hasFunction,
+        after: true
+      };
+    }
+  },
+
+  SwitchCase: function (node, parent) {
+    return {
+      before: node.consequent.length || parent.cases[0] === node
+    };
+  },
+
+  LogicalExpression: function (node) {
+    if (t.isFunction(node.left) || t.isFunction(node.right)) {
+      return {
+        after: true
+      };
+    }
+  },
+
+  Literal: function (node) {
+    if (node.value === "use strict") {
+      return {
+        after: true
+      };
+    }
+  },
+
+  CallExpression: function (node) {
+    if (t.isFunction(node.callee) || isHelper(node)) {
+      return {
+        before: true,
+        after: true
+      };
+    }
+  },
+
+  VariableDeclaration: function (node) {
+    for (var i = 0; i < node.declarations.length; i++) {
+      var declar = node.declarations[i];
+
+      var enabled = isHelper(declar.id) && !isType(declar.init);
+      if (!enabled) {
+        var state = crawl(declar.init);
+        enabled = (isHelper(declar.init) && state.hasCall) || state.hasFunction;
+      }
+
+      if (enabled) {
+        return {
+          before: true,
+          after: true
+        };
+      }
+    }
+  },
+
+  IfStatement: function (node) {
+    if (t.isBlockStatement(node.consequent)) {
+      return {
+        before: true,
+        after: true
+      };
+    }
+  }
+};
+
+exports.nodes.Property =
+exports.nodes.SpreadProperty = function (node, parent) {
+  if (parent.properties[0] === node) {
+    return {
+      before: true
+    };
+  }
+};
+
+exports.list = {
+  VariableDeclaration: function (node) {
+    return map(node.declarations, "init");
+  },
+
+  ArrayExpression: function (node) {
+    return node.elements;
+  },
+
+  ObjectExpression: function (node) {
+    return node.properties;
+  }
+};
+
+each({
+  Function: true,
+  Class: true,
+  Loop: true,
+  LabeledStatement: true,
+  SwitchStatement: true,
+  TryStatement: true
+}, function (amounts, type) {
+  if (isBoolean(amounts)) {
+    amounts = { after: amounts, before: amounts };
+  }
+
+  each([type].concat(t.FLIPPED_ALIAS_KEYS[type] || []), function (type) {
+    exports.nodes[type] = function () {
+      return amounts;
+    };
+  });
+});

lib/babel/generation/source-map.js

@@ -48,8 +48,6 @@ SourceMap.prototype.mark = function (node, type) {
 
   var original = loc[type];
 
-  if (generated.line === original.line && generated.column === original.column) return; // nothing to map
-
   map.addMapping({
     source: this.opts.sourceFileName,
     generated: generated,

lib/babel/generation/whitespace.js

@@ -2,7 +2,7 @@
 
 module.exports = Whitespace;
 
-var _    = require("lodash");
+var sortBy = require("lodash/collection/sortBy");
 
 /**
  * Returns `i`th number from `base`, continuing from 0 when `max` is reached.
@@ -13,17 +13,19 @@ var _    = require("lodash");
  * @param {Number} max Array length
  * @returns {Number} shiftedIndex
  */
+
 function getLookupIndex(i, base, max) {
   i += base;
 
-  if (i >= max)
+  if (i >= max) {
     i -= max;
+  }
 
   return i;
 }
 
 function Whitespace(tokens, comments) {
-  this.tokens = _.sortBy(tokens.concat(comments), "start");
+  this.tokens = sortBy(tokens.concat(comments), "start");
   this.used   = {};
 
   // Profiling this code shows that while generator passes over it, indexes
@@ -82,7 +84,7 @@ Whitespace.prototype.getNewlinesAfter = function (node) {
     }
   }
 
-  if (endToken.type.type === "eof") {
+  if (endToken && endToken.type.type === "eof") {
     return 1;
   } else {
     var lines = this.getNewlinesBetween(startToken, endToken);
@@ -96,6 +98,8 @@ Whitespace.prototype.getNewlinesAfter = function (node) {
 };
 
 Whitespace.prototype.getNewlinesBetween = function (startToken, endToken) {
+  if (!endToken || !endToken.loc) return 0;
+
   var start = startToken ? startToken.loc.end.line : 1;
   var end   = endToken.loc.start.line;
   var lines = 0;

lib/babel/helpers/code-frame.js

@@ -1,9 +1,8 @@
 // syntax highlighting based on https://github.com/dominictarr/ansi-highlight by the fantastic Dominic Tarr
 
-var supportsColor = require("supports-color");
-var tokenize      = require("js-tokenizer");
-var chalk         = require("chalk");
-var util          = require("../util");
+var repeating = require("repeating");
+var tokenize  = require("js-tokenizer");
+var chalk     = require("chalk");
 
 var defs = {
   string1:  "red",
@@ -43,11 +42,11 @@ var highlight = function (text) {
 module.exports = function (lines, lineNumber, colNumber) {
   colNumber = Math.max(colNumber, 0);
 
-  if (supportsColor) {
+  if (chalk.supportsColor) {
     lines = highlight(lines);
   }
 
-  lines = lines.split("\n");
+  lines = lines.split(/\r\n|[\n\r\u2028\u2029]/);
 
   var start = Math.max(lineNumber - 3, 0);
   var end   = Math.min(lines.length, lineNumber + 3);
@@ -63,15 +62,15 @@ module.exports = function (lines, lineNumber, colNumber) {
 
     var gutter = curr === lineNumber ? "> " : "  ";
 
-    var sep = curr + util.repeat(width + 1);
+    var sep = curr + repeating(" ", width + 1);
     gutter += sep + "| ";
 
     var str = gutter + line;
 
     if (colNumber && curr === lineNumber) {
       str += "\n";
-      str += util.repeat(gutter.length - 2);
-      str += "|" + util.repeat(colNumber) + "^";
+      str += repeating(" ", gutter.length - 2);
+      str += "|" + repeating(" ", colNumber) + "^";
     }
 
     return str;

lib/babel/helpers/normalize-ast.js

@@ -0,0 +1,9 @@
+var t = require("../types");
+
+module.exports = function (ast, comments, tokens) {
+  if (ast && ast.type === "Program") {
+    return t.file(ast, comments || [], tokens || []);
+  } else {
+    throw new Error("Not a valid ast?");
+  }
+};

lib/babel/helpers/parse.js

@@ -0,0 +1,49 @@
+var normalizeAst = require("./normalize-ast");
+var estraverse   = require("estraverse");
+var codeFrame    = require("./code-frame");
+var acorn        = require("acorn-babel");
+
+module.exports = function (opts, code, callback) {
+  try {
+    var comments = [];
+    var tokens   = [];
+
+    var ast = acorn.parse(code, {
+      allowImportExportEverywhere: opts.allowImportExportEverywhere,
+      allowReturnOutsideFunction:  !opts._anal,
+      ecmaVersion:                 opts.experimental ? 7 : 6,
+      playground:                  opts.playground,
+      strictMode:                  opts.strictMode,
+      onComment:                   comments,
+      locations:                   true,
+      onToken:                     tokens,
+      ranges:                      true
+    });
+
+    estraverse.attachComments(ast, comments, tokens);
+
+    ast = normalizeAst(ast, comments, tokens);
+
+    if (callback) {
+      return callback(ast);
+    } else {
+      return ast;
+    }
+  } catch (err) {
+    if (!err._babel) {
+      err._babel = true;
+      var message = opts.filename + ": " + err.message;
+
+      var loc = err.loc;
+      if (loc) {
+        var frame = codeFrame(code, loc.line, loc.column + 1);
+        message += frame;
+      }
+
+      if (err.stack) err.stack = err.stack.replace(err.message, message);
+      err.message = message;
+    }
+
+    throw err;
+  }
+};

lib/babel/messages.js

@@ -0,0 +1,51 @@
+var util = require("util");
+
+exports.messages = {
+  tailCallReassignmentDeopt: "Function reference has been reassigned so it's probably be dereferenced so we can't optimise this with confidence",
+  JSXNamespacedTags: "Namespace tags are not supported. ReactJSX is not XML.",
+  classesIllegalBareSuper: "Illegal use of bare super",
+  classesIllegalSuperCall: "Direct super call is illegal in non-constructor, use super.$1() instead",
+  classesIllegalConstructorKind: "Illegal kind for constructor method",
+  scopeDuplicateDeclaration: "Duplicate declaration $1",
+  undeclaredVariable: "Reference to undeclared variable $1",
+  undeclaredVariableSuggestion: "Reference to undeclared variable $1 - did you mean $2?",
+  settersInvalidParamLength: "Setters must have exactly one parameter",
+  noAssignmentsInForHead: "No assignments allowed in for-in/of head",
+  expectedMemberExpressionOrIdentifier: "Expected type MemeberExpression or Identifier",
+  invalidParentForThisNode: "We don't know how to handle this node within the current parent - please open an issue",
+  readOnly: "$1 is read-only",
+  modulesIllegalExportName: "Illegal export $1",
+  unknownForHead: "Unknown node type $1 in ForStatement",
+  didYouMean: "Did you mean $1?",
+  evalInStrictMode: "eval is not allowed in strict mode",
+  codeGeneratorDeopt: "Note: The code generator has deoptimised the styling of $1 as it exceeds the max of $2."
+};
+
+exports.get = function (key) {
+  var msg = exports.messages[key];
+  if (!msg) throw new ReferenceError("Unknown message `" + key + "`");
+
+  var args = [];
+  for (var i = 1; i < arguments.length; i++) {
+    args.push(arguments[i]);
+  }
+  args = exports.parseArgs(args);
+
+  return msg.replace(/\$(\d+)/g, function (str, i) {
+    return args[--i];
+  });
+};
+
+exports.parseArgs = function (args) {
+  return args.map(function (val) {
+    if (val != null && val.inspect) {
+      return val.inspect();
+    } else {
+      try {
+        return JSON.stringify(val) || val + "";
+      } catch (e) {
+        return util.inspect(val);
+      }
+    }
+  });
+};

lib/babel/patch.js

@@ -1,16 +1,14 @@
 "use strict";
 
-var t = require("./types");
-var _ = require("lodash");
-
-require("./types/node");
+var extend = require("lodash/object/extend");
+var t      = require("./types");
 
 // estraverse
 
 var estraverse = require("estraverse");
-_.extend(estraverse.VisitorKeys, t.VISITOR_KEYS);
+extend(estraverse.VisitorKeys, t.VISITOR_KEYS);
 
-// regenerator-6to5/ast-types
+// regenerator-babel/ast-types
 
 var types = require("ast-types");
 var def   = types.Type.def;
@@ -34,9 +32,9 @@ def("ImportBatchSpecifier")
   .field("name", def("Identifier"));
 
 def("RestElement")
-  .bases("Node")
+  .bases("Pattern")
   .build("argument")
-  .field("argument", def("Pattern"));
+  .field("argument", def("expression"));
 
 // Abstract references
 def("VirtualPropertyExpression")

lib/babel/polyfill.js

@@ -0,0 +1,9 @@
+"use strict";
+
+if (global._babelPolyfill) {
+  throw new Error("only one instance of babel/polyfill is allowed");
+}
+global._babelPolyfill = true;
+
+require("core-js/shim");
+require("regenerator-babel/runtime");