v5.2.6

This reverts commit c3c4cf17e3.

.babelrc

@@ -1,6 +1,6 @@
 {
-  "experimental": true,
-  "playground": true,
-  "loose": true,
-  "blacklist": ["es6.tailCall"]
+  "stage": 0,
+  "loose": ["all"],
+  "blacklist": ["es6.tailCall"],
+  "optional": ["optimisation.flow.forOf"]
 }

.gitmodules

@@ -1,12 +1,6 @@
 [submodule "vendor/traceur"]
 	path = vendor/traceur
 	url = https://github.com/google/traceur-compiler
-[submodule "vendor/regenerator"]
-	path = vendor/regenerator
-	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

.travis.yml

@@ -1,4 +1,4 @@
-sudo: false
+#sudo: false
 language: node_js
 cache:
   directories:

CHANGELOG.md

@@ -13,6 +13,128 @@ _Note: Gaps between patch versions are faulty/broken releases._
 
 See [CHANGELOG - 6to5](CHANGELOG-6to5.md) for the pre-4.0.0 version changelog.
 
+## 5.2.6
+
+ * **Internal**
+  * Fix transformer aliases being accidently set as deprecated ones.
+  * Expose `Pipeline` as `TransformerPipeline` instead.
+
+## 5.2.5
+
+ * **Bug Fix**
+  * Fix `parse` API not adding all the correct pipeline transformers.
+
+## 5.2.4
+
+ * **Bug Fix**
+  * Fix race condition with the Node API being loaded awkwardly and not being able to initialise itself when used in the browser.
+ * **Internal**
+  * Expose `transform.pipeline`.
+
+## 5.2.3
+
+ * **Bug Fix**
+  * Fix plugin containers being called with an undefined import. Thanks [@timbur](https://github.com/timbur)!
+  * Allow Flow object separators to be commas. Thanks [@monsanto](https://github.com/monsanto)!
+  * Add missing `Statement` and `Declaration` node aliases to flow types.
+
+## 5.2.2
+
+ * **Internal**
+  * Allow `util.arrayify` to take arbitrary types and coerce it into an array.
+
+## 5.2.1
+
+ * **Bug Fix**
+  * Fix regression in `node/register` that caused `node_modules` to not be ignored.
+
+## 5.2.0
+
+ * **Bug Fix**
+  * Fix plugin strings splitting arbitrarily on `:` which caused full paths on Windows to fail as they include `:` after the drive letter.
+  * Call class property `initializer`s with their target instead of their descriptor.
+  * Fix `ignore` and `only` not properly working on Windows path separators. Thanks [@stagas](https://github.com/stagas)!
+  * Fix `resolveRc` running on files twice causing issues. Thanks [@lukescott](https://github.com/lukescott)!
+  * Fix shorthand properties not correctly being target for `isReferenced` checks. Thanks [@monsanto](https://github.com/monsanto)!
+ * **Polish**
+  * Allow passing an array of globs to `babel/register` `only` and `ignore` options. Thanks [@Mark-Simulacrum](https://github.com/Mark-Simulacrum)!
+  * When inferring function names that collide with upper bindings, instead of doing the wrapper, instead rename them.
+  * Consider constant-like variable declaration functions to always refer to themselves so TOC can be performed.
+  * Process globs manually when using `$ babel` as some shells such as Windows don't explode them. Thanks [@jden](https://github.com/jden)!
+  * Add alternative way to execute plugins via a closure that's called with the current Babel instance.
+ * **Internal**
+  * Remove multiple internal transformers in favor of directly doing things when we need to. Previously, declarations such as `_ref` that we needed to create in specific scopes were done at the very end via the `_declarations` transformer. Now, they're done and added to the scope **right** when they're needed. This gets rid of the crappy `_declarations` property on scope nodes and fixes the crappy regenerator bug where it was creating a new `BlockStatement` so the declarations were being lost.
+  * Rework transformer traversal optimisation. Turns out that calling a `check` function for **every single node** in the AST is ridiculously expensive. 300,000 nodes timesed by ~30 transformers meant that it took tens of seconds to perform while it's quicker to just do the unnecessary traversal. Seems obvious in hindsight.
+ * **New Feature**
+  * Add `jscript` transformer that turns named function expressions into function declarations to get around [JScript's horribly broken function expression semantics](https://kangax.github.io/nfe/#jscript-bugs). Thanks [@kondi](https://github.com/kondi)!
+  * Add `@@hasInstance` support to objects when using the `es6.spec.symbols` transformer.
+  * Add `retainLines` option that retains the line (but not the columns!) of the input code.
+
+## 5.1.13
+
+ * **Polish**
+  * Remove symbol check from `defineProperty` helper.
+
+## 5.1.12
+
+ * **Bug Fix**
+  * Fix `resolveModuleSource` not being ran on `ExportAllDeclaration`s.
+  * Fix `.babelrc` being resolved multiple times when using the require hook.
+  * Fix parse error on spread properties in assignment position.
+  * Fix `externalHelpers` option being incorrectly listed as type `string`.
+ * **Internal**
+  * Upgrade `core-js` to `0.9.0`.
+ * **Spec Compliancy**
+  * Fix object decorators not using the `initializer` pattern.
+  * Remove property initializer descriptor reflection.
+
+## 5.1.11
+
+ * **Bug Fix**
+  * Memoise and bind member expression decorators.
+  * Move JSX children cleaning to opening element visitor. Fixes elements not being cleaned in certain scenarios.
+  * Consider `SwitchStatement`s to be `Scopable`.
+  * Fix `bluebirdCoroutines` calling `interopRequireWildcard` before it's defined.
+  * Add space to `do...while` code generation.
+  * Validate `super` use before `this` on `super` exit rather than entrance.
+ * **Polish**
+  * Add Babel name to logger.
+
+## 5.1.10
+
+ * **Bug Fix**
+  * Remove `makePredicate` from acorn in favor of an `indexOf`.
+  * Remove statements to expression explosion when inserting a block statement.
+ * **Internal**
+  * Remove runtime compatibility check.
+
+## 5.1.9
+
+ * **Bug Fix**
+  * Fix class property initializers with `undefined` values not being correctly writable.
+  * Fix self inferring generators incorrectly causing a stack error.
+  * Fix default export specifiers not triggering AMD `module` argument inclusion.
+  * Fix assignments not having their module references properly remapped.
+ * **Internal**
+  * Upgrade to latest `acorn`.
+ * **Polish**
+  * Make invalid LHS pattern error messages nicer.
+
+## 5.1.8
+
+ * **Bug Fix**
+  * Only make parenthesized object pattern LHS illegal.
+
+## 5.1.7
+
+ * **Internal**
+  * Add `parse` node API.
+
+## 5.1.6
+
+ * **Bug Fix**
+  * Fix `runtime` built-in catchall not properly checking for local variables.
+
 ## 5.1.5
 
  * **Internal**

CONTRIBUTING.md

@@ -1,9 +1,24 @@
+<p align="center">
+   <strong><a href="#setup">Setup</a></strong>
+   |
+   <strong><a href="#running-tests">Running tests</a></strong>
+   |
+   <strong><a href="#workflow">Workflow</a></strong>
+   |
+   <strong><a href="#dependencies">Dependencies</a></strong>
+   |
+   <strong><a href="#code-standards">Code Standards</a></strong>
+</p>
+
+----
+
 # Contributing
 
 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).
 
+
 ## Developing
 
 #### Setup
@@ -14,14 +29,19 @@ $ cd babel
 $ make bootstrap
 ```
 
-Then you need to run:
+Then you can either run:
+
+```sh
+$ make build-core
+```
+
+to build Babel **once** or:
 
 ```sh
 $ make watch-core
 ```
 
-This will compile Babel and then sit in the background and on file modification
-recompile the necessary files.
+to have Babel build itself then incrementally build files on change.
 
 #### Running tests
 
@@ -44,6 +64,11 @@ Use mocha's `--grep` option to run a subset of tests by name:
 $ mocha test/core/transformation.js --grep es7
 ```
 
+If you don't have `mocha` installed globally, you can still use it from Babel's
+dependencies in `node_modules`, but make sure `node_modules/.bin` is added to
+your [`$PATH`](http://unix.stackexchange.com/questions/26047/how-to-correctly-add-a-path-to-path) environment variable.
+
+
 #### Workflow
 
 * Fork the repository
@@ -54,24 +79,91 @@ $ mocha test/core/transformation.js --grep es7
 * Ensure the test are passing (`make test`)
 * Create new pull request explaining your proposed change or reference an issue in your commit message
 
+
+#### Dependencies
+
++ [ast-types](http://ghub.io/ast-types) This is required to monkeypatch regenerators AST definitions. Could be improved in the future.
+
++ [chalk](http://ghub.io/chalk) This is used for terminal color highlighting for syntax errors.
+
++ [convert-source-map](http://ghub.io/convert-source-map) Turns a source map object into a comment etc.
+
++ [core-js](http://ghub.io/core-js) Used for the polyfill.
+
++ [debug](http://ghub.io/debug) Used to output debugging information when NODE_DEBUG is set to babel.
+
++ [detect-indent](http://ghub.io/detect-indent) This is used in the code generator so it can infer indentation.
+
++ [estraverse](http://ghub.io/estraverse) The only method on this is attachComments. I'd like to implement our own comment attachment algorithm eventually though.
+
++ [esutils](http://ghub.io/esutils) Various ES related utilities. Check whether something is a keyword etc.
+
++ [fs-readdir-recursive](http://ghub.io/fs-readdir-recursive) Recursively search a directory for.
+
++ [globals](http://ghub.io/globals) A list of JavaScript global variables. This is used by the scope tracking to check for colliding variables.
+
++ [is-integer](http://ghub.io/is-integer) Checks if something is an integer.
+
++ [js-tokens](http://ghub.io/js-tokens) This is used to get tokens for syntax error highlighting.
+
++ [leven](http://ghub.io/leven) A levenstein algorithm to determine how close a word is to another. This is used to offer suggestions when using the utility.undeclaredVariableCheck transformer.
+
++ [line-numbers](http://ghub.io/line-numbers) Used to produce the code frames in syntax errors.
+
++ [lodash](http://ghub.io/lodash) Used for various utilities.
+
++ [minimatch](http://ghub.io/minimatch) This is used to match glob-style ignore/only filters.
+
++ [output-file-sync](http://ghub.io/output-file-sync) Synchronously writes a file and create its ancestor directories if needed.
+
++ [path-is-absolute](http://ghub.io/path-is-absolute) Checks if a path is absolute. C:\foo and \foo are considered absolute.
+
++ [regenerator](http://ghub.io/regenerator) This is used to transform generators/async functions.
+
++ [regexpu](http://ghub.io/regexpu) Used to transform unicode regex patterns.
+
++ [repeating](http://ghub.io/repeating) Repeats a string.
+
++ [shebang-regex](http://ghub.io/shebang-regex) Literally just a regex that matches shebangs.
+
++ [slash](http://ghub.io/slash) Normalises path separators.
+
++ [source-map](http://ghub.io/source-map) Generates sourcemaps.
+
++ [source-map-support](http://ghub.io/source-map-support) Adds source map support to babel-node/babel/register.
+
++ [strip-json-comments](http://ghub.io/strip-json-comments) Remove comments from a JSON string. This is used for .babelrc files.
+
++ [to-fast-properties](http://ghub.io/to-fast-properties) A V8 trick to put an object into fast properties mode.
+
++ [trim-right](http://ghub.io/trim-right) Trims the rightside whitespace.
+
++ [user-home](http://ghub.io/user-home) Gets the users home directory. This is used to resolve the babel-node/babel/register cache.
+
+
 #### Code Standards
 
  * **General**
    * Max of five arguments for functions
    * Max depth of four nested blocks
    * 2-spaced soft tabs
+
  * **Naming**
    * CamelCase all class names
    * camelBack all variable names
+
  * **Spacing**
    * Spaces after all keywords
    * Spaces before all left curly braces
+
  * **Comments**
    * Use JSDoc-style comments for methods
    * Single-line comments for ambiguous code
+
  * **Quotes**
    * Always use double quotes
    * Only use single quotes when the string contains a double quote
+
  * **Declaration**
    * No unused variables
    * No pollution of global variables and prototypes

Makefile

@@ -9,17 +9,20 @@ BABEL_CMD = node_modules/babel/bin/babel
 
 export NODE_ENV = test
 
-.PHONY: clean test test-cov test-clean test-travis test-simple test-all test-browser test-parser publish build bootstrap publish-core publish-runtime build-core watch-core build-core-test
+.PHONY: clean test test-cov test-clean test-travis test-simple test-all test-browser test-parser publish build bootstrap publish-core publish-runtime build-core watch-core build-core-test clean-core
 
-build-core:
+build-core: clean-core
 	node $(BABEL_CMD) src --out-dir lib --copy-files
 
-build-core-test:
+build-core-test: clean-core
 	node $(BABEL_CMD) src --out-dir lib --copy-files --auxiliary-comment "istanbul ignore next"
 
-watch-core:
+watch-core: clean-core
 	node $(BABEL_CMD) src --out-dir lib --watch --copy-files
 
+clean-core:
+	rm -rf lib
+
 build:
 	mkdir -p dist
 	make build-core
@@ -114,5 +117,5 @@ bootstrap:
 	npm link
 	cd packages/babel-cli && npm install && npm link && npm link babel-core
 	git submodule update --init
-	cd vendor/regenerator && npm install
 	cd vendor/compat-table && npm install object-assign
+	make build

package.json

@@ -1,7 +1,7 @@
 {
   "name": "babel-core",
   "description": "Turn ES6 code into readable vanilla ES5 with source maps",
-  "version": "5.1.6",
+  "version": "5.2.6",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://babeljs.io/",
   "repository": "babel/babel",
@@ -28,9 +28,10 @@
   },
   "dependencies": {
     "ast-types": "~0.7.0",
+    "bluebird": "^2.9.25",
     "chalk": "^1.0.0",
-    "convert-source-map": "^1.0.0",
-    "core-js": "^0.8.3",
+    "convert-source-map": "^1.1.0",
+    "core-js": "^0.9.0",
     "debug": "^2.1.1",
     "detect-indent": "^3.0.0",
     "estraverse": "^3.0.0",
@@ -49,6 +50,7 @@
     "regenerator": "^0.8.20",
     "regexpu": "^1.1.2",
     "repeating": "^1.1.2",
+    "resolve": "^1.1.6",
     "shebang-regex": "^1.0.0",
     "slash": "^1.0.0",
     "source-map": "^0.4.0",
@@ -59,7 +61,7 @@
     "user-home": "^1.1.1"
   },
   "devDependencies": {
-    "babel": "4.7.13",
+    "babel": "5.1.13",
     "browserify": "^9.0.8",
     "chai": "^2.2.0",
     "eslint": "^0.18.0",

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

@@ -8,6 +8,7 @@ var util      = require("babel-core").util;
 var each      = require("lodash/collection/each");
 var keys      = require("lodash/object/keys");
 var fs        = require("fs");
+var glob      = require("glob");
 
 each(options, function (option, key) {
   if (option.hidden) return;
@@ -69,7 +70,9 @@ commander.parse(process.argv);
 
 var errors = [];
 
-var filenames = commander.args;
+var filenames = commander.args.reduce(function (globbed, input) {
+  return globbed.concat(glob.sync(input));
+}, []);
 
 each(filenames, function (filename) {
   if (!fs.existsSync(filename)) {

packages/babel-cli/package.json

@@ -1,21 +1,22 @@
 {
   "name": "babel",
   "description": "Turn ES6 code into readable vanilla ES5 with source maps",
-  "version": "5.1.5",
+  "version": "5.2.5",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://babeljs.io/",
   "repository": "babel/babel",
   "preferGlobal": true,
   "dependencies": {
-    "babel-core": "^5.1.5",
+    "babel-core": "^5.2.5",
     "chokidar": "^1.0.0",
     "commander": "^2.6.0",
+    "convert-source-map": "^1.1.0",
     "fs-readdir-recursive": "^0.1.0",
-    "output-file-sync": "^1.1.0",
+    "glob": "^5.0.5",
     "lodash": "^3.2.0",
-    "convert-source-map": "^0.5.0",
-    "source-map": "^0.4.0",
-    "path-is-absolute": "^1.0.0"
+    "output-file-sync": "^1.1.0",
+    "path-is-absolute": "^1.0.0",
+    "source-map": "^0.4.0"
   },
   "bin": {
     "babel": "./bin/babel/index.js",

packages/babel-cli/register-without-polyfill.js

@@ -0,0 +1 @@
+module.exports = require("babel-core/register-without-polyfill");

packages/babel-runtime/package.json

@@ -1,10 +1,10 @@
 {
   "name": "babel-runtime",
   "description": "babel selfContained runtime",
-  "version": "5.1.5",
+  "version": "5.2.5",
   "repository": "babel/babel",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "dependencies": {
-    "core-js": "^0.8.0"
+    "core-js": "^0.9.0"
   }
 }

packages/build-runtime.js

@@ -70,8 +70,8 @@ each(File.helpers, function (helperName) {
   writeFile("helpers/" + helperName + ".js", buildHelper(helperName));
 });
 
-writeFile("regenerator/index.js", readFile("regenerator-babel/runtime-module", true));
-writeFile("regenerator/runtime.js", selfContainify(readFile("regenerator-babel/runtime")));
+writeFile("regenerator/index.js", readFile("regenerator/runtime-module", true));
+writeFile("regenerator/runtime.js", selfContainify(readFile("regenerator/runtime")));
 
 //
 

register-without-polyfill.js

@@ -0,0 +1 @@
+module.exports = require("./lib/babel/api/register/node");

register.js

@@ -1 +1 @@
-module.exports = require("./lib/babel/api/register/node");
+module.exports = require("./lib/babel/api/register/node-polyfill");

src/acorn/index.js

@@ -0,0 +1,3 @@
+export * from "./src/index";
+import "./plugins/flow";
+import "./plugins/jsx";

src/acorn/package.json

@@ -2,7 +2,7 @@
   "name": "acorn",
   "description": "ECMAScript parser",
   "homepage": "https://github.com/marijnh/acorn",
-  "main": "src/index.js",
+  "main": "index.js",
   "version": "1.0.0",
   "engines": {
     "node": ">=0.4.0"

src/acorn/plugins/flow.js

@@ -1,4 +1,4 @@
-var acorn = require("..")
+var acorn = require("../src/index")
 
 var pp = acorn.Parser.prototype
 var tt = acorn.tokTypes
@@ -322,7 +322,7 @@ pp.flow_parseObjectType = function (allowStatic) {
 }
 
 pp.flow_objectTypeSemicolon = function () {
-  if (!this.eat(tt.semi) && this.type !== tt.braceR) {
+  if (!this.eat(tt.semi) && !this.eat(tt.comma) && this.type !== tt.braceR) {
     this.unexpected()
   }
 }

src/acorn/plugins/jsx.js

@@ -1,4 +1,4 @@
-var acorn = require("..")
+var acorn = require("../src/index")
 
 var tt = acorn.tokTypes;
 var tc = acorn.tokContexts;

src/acorn/src/expression.js

@@ -104,10 +104,14 @@ pp.parseMaybeAssign = function(noIn, refShorthandDefaultPos, afterLeftParse) {
     refShorthandDefaultPos.start = 0 // reset because shorthand default was used correctly
     this.checkLVal(left)
     if (left.parenthesizedExpression) {
+      let errorMsg
       if (left.type === "ObjectPattern") {
-        this.raise(left.start, "You're trying to assign to a parenthesized expression, instead of `({ foo }) = {}` use `({ foo } = {})`");
-      } else {
-        this.raise(left.start, "Parenthesized left hand expressions are illegal");
+        errorMsg = "`({a}) = 0` use `({a} = 0)`"
+      } else if (left.type === "ArrayPattern") {
+        errorMsg = "`([a]) = 0` use `([a] = 0)`"
+      }
+      if (errorMsg) {
+        this.raise(left.start, `You're trying to assign to a parenthesized expression, eg. instead of ${errorMsg}`)
       }
     }
     this.next()

src/acorn/src/identifier.js

@@ -9,41 +9,9 @@
 
 function makePredicate(words) {
   words = words.split(" ")
-  let f = "", cats = []
-  out: for (let i = 0; i < words.length; ++i) {
-    for (let j = 0; j < cats.length; ++j)
-      if (cats[j][0].length == words[i].length) {
-        cats[j].push(words[i])
-        continue out
-      }
-    cats.push([words[i]])
+  return function(str) {
+    return words.indexOf(str) >= 0
   }
-  function compareTo(arr) {
-    if (arr.length == 1) return f += "return str === " + JSON.stringify(arr[0]) + ";"
-    f += "switch(str){"
-    for (let i = 0; i < arr.length; ++i) f += "case " + JSON.stringify(arr[i]) + ":"
-    f += "return true}return false;"
-  }
-
-  // When there are more than three length categories, an outer
-  // switch first dispatches on the lengths, to save on comparisons.
-
-  if (cats.length > 3) {
-    cats.sort((a, b) => b.length - a.length)
-    f += "switch(str.length){"
-    for (let i = 0; i < cats.length; ++i) {
-      let cat = cats[i]
-      f += "case " + cat[0].length + ":"
-      compareTo(cat)
-    }
-    f += "}"
-
-    // Otherwise, simply generate a flat `switch` statement.
-
-  } else {
-    compareTo(words)
-  }
-  return new Function("str", f)
 }
 
 // Reserved word lists for various dialects of the language

src/acorn/src/index.js

@@ -38,9 +38,6 @@ export {isIdentifierChar, isIdentifierStart} from "./identifier"
 export {Token} from "./tokenize"
 export {isNewLine, lineBreak, lineBreakG} from "./whitespace"
 
-import "../plugins/flow";
-import "../plugins/jsx";
-
 export const version = "1.0.0"
 
 // The main exported interface (under `self.acorn` when in the

src/acorn/src/lval.js

@@ -21,6 +21,7 @@ pp.toAssignable = function(node, isBinding) {
       node.type = "ObjectPattern"
       for (let i = 0; i < node.properties.length; i++) {
         let prop = node.properties[i]
+        if (prop.type === "SpreadProperty") continue;
         if (prop.kind !== "init") this.raise(prop.key.start, "Object pattern can't contain getter or setter")
         this.toAssignable(prop.value, isBinding)
       }

src/acorn/src/statement.js

@@ -691,7 +691,6 @@ pp.parseImport = function(node) {
   if (this.type === tt.string) {
     node.specifiers = empty
     node.source = this.parseExprAtom()
-    node.kind = ""
   } else {
     node.specifiers = []
     this.parseImportSpecifiers(node)

src/acorn/src/tokentype.js

@@ -116,7 +116,7 @@ kw("do", {isLoop: true})
 kw("else", beforeExpr)
 kw("finally")
 kw("for", {isLoop: true})
-kw("function")
+kw("function", startsExpr)
 kw("if")
 kw("return", beforeExpr)
 kw("switch")

src/babel/api/browser.js

@@ -1,3 +1,4 @@
+require("./node");
 var transform = module.exports = require("../transformation");
 
 transform.options = require("../transformation/file/options");
@@ -11,7 +12,7 @@ transform.run = function (code, opts = {}) {
 };
 
 transform.load = function (url, callback, opts = {}, hold) {
-  opts.filename ||= url;
+  opts.filename = opts.filename || url;
 
   var xhr = global.ActiveXObject ? new global.ActiveXObject("Microsoft.XMLHTTP") : new global.XMLHttpRequest();
   xhr.open("GET", url, true);

src/babel/api/node.js

@@ -5,10 +5,12 @@ import * as util from "../util";
 import fs from "fs";
 
 export { util, acorn, transform };
+export { pipeline } from "../transformation";
 export { canCompile } from "../util";
 
 export { default as options } from "../transformation/file/options";
 export { default as Transformer } from "../transformation/transformer";
+export { default as TransformerPipeline } from "../transformation/transformer-pipeline";
 export { default as traverse } from "../traversal";
 export { default as buildExternalHelpers } from "../tools/build-external-helpers";
 export { version } from "../../../package";
@@ -17,7 +19,7 @@ import * as t from "../types";
 export { t as types };
 
 export function register(opts?: Object) {
-  var callback = require("./register/node");
+  var callback = require("./register/node-polyfill");
   if (opts != null) callback(opts);
   return callback;
 }
@@ -55,14 +57,15 @@ export function transformFileSync(filename: string, opts?: Object = {}) {
 }
 
 export function parse(code, opts = {}) {
-  opts.ecmaVersion = 6;
+  opts.sourceType = "module";
+  opts.ecmaVersion = Infinity;
   opts.plugins = {
     flow: true,
     jsx:  true
   };
   opts.features = {};
 
-  for (var key in transform.transformers) {
+  for (var key in transform.pipeline.transformers) {
     opts.features[key] = true;
   }
 

src/babel/api/register/node-polyfill.js

@@ -0,0 +1,2 @@
+import "../../polyfill";
+export { default } from "./node";

src/babel/api/register/node.js

@@ -1,4 +1,3 @@
-import "../../polyfill";
 import sourceMapSupport from "source-map-support";
 import * as registerCache from "./cache";
 import resolveRc from "../../tools/resolve-rc";
@@ -7,6 +6,7 @@ import * as babel from "../node";
 import each from "lodash/collection/each";
 import * as util from  "../../util";
 import fs from "fs";
+import slash from "slash";
 
 sourceMapSupport.install({
   handleUncaughtExceptions: false,
@@ -31,8 +31,10 @@ var cache = registerCache.get();
 //
 
 var transformOpts = {};
-var ignoreRegex   = /node_modules/;
-var onlyRegex;
+
+var ignore;
+var only;
+
 var oldHandlers   = {};
 var maps          = {};
 
@@ -76,7 +78,11 @@ var compile = function (filename) {
 };
 
 var shouldIgnore = function (filename) {
-  return (ignoreRegex && ignoreRegex.test(filename)) || (onlyRegex && !onlyRegex.test(filename));
+  if (!ignore && !only) {
+    return /node_modules/.test(filename);
+  } else {
+    return util.shouldIgnore(filename, ignore || [], only || []);
+  }
 };
 
 var istanbulMonkey = {};
@@ -142,8 +148,8 @@ var hookExtensions = function (_exts) {
 hookExtensions(util.canCompile.EXTENSIONS);
 
 export default function (opts = {}) {
-  if (opts.only != null) onlyRegex = util.regexify(opts.only);
-  if (opts.ignore != null) ignoreRegex = util.regexify(opts.ignore);
+  if (opts.only != null) only = util.arrayify(opts.only, util.regexify);
+  if (opts.ignore != null) ignore = util.arrayify(opts.ignore, util.regexify);
 
   if (opts.extensions) hookExtensions(util.arrayify(opts.extensions));
 
@@ -156,16 +162,3 @@ export default function (opts = {}) {
 
   extend(transformOpts, opts);
 };
-
-//
-
-try {
-  var runtimePackage = require("babel-runtime/package");
-  var version = require("../../../../package").version;
-  if (runtimePackage.version !== version) {
-    throw new ReferenceError(`The verison of babel-runtime of ${runtimePackage.runtime} that you have installed does not match the babel verison of ${version}`);
-  }
-} catch (err) {
-  if (err.code !== "MODULE_NOT_FOUND") throw err;
-}
-

src/babel/generation/buffer.js

@@ -70,14 +70,14 @@ export default class Buffer {
   }
 
   newline(i, removeLast) {
-    if (this.format.compact) return;
+    if (this.format.compact || this.format.retainLines) return;
 
     if (this.format.concise) {
       this.space();
       return;
     }
 
-    removeLast ||= false;
+    removeLast = removeLast || false;
 
     if (isNumber(i)) {
       i = Math.min(2, i);

src/babel/generation/generators/base.js

@@ -13,7 +13,7 @@ export function BlockStatement(node, print) {
     this.push("{");
     this.newline();
     print.sequence(node.body, { indent: true });
-    this.removeLast("\n");
+    if (!this.format.retainLines) this.removeLast("\n");
     this.rightBrace();
   }
 }

src/babel/generation/generators/jsx.js

@@ -45,7 +45,7 @@ export function JSXElement(node, print) {
   this.indent();
   each(node.children, (child) => {
     if (t.isLiteral(child)) {
-      this.push(child.value);
+      this.push(child.value, true);
     } else {
       print(child);
     }

src/babel/generation/generators/statements.js

@@ -71,7 +71,7 @@ export var ForInStatement = buildForXStatement("in");
 export var ForOfStatement = buildForXStatement("of");
 
 export function DoWhileStatement(node, print) {
-  this.keyword("do");
+  this.push("do ");
   print(node.body);
   this.space();
   this.keyword("while");

src/babel/generation/index.js

@@ -12,7 +12,7 @@ import * as t from "../types";
 
 class CodeGenerator {
   constructor(ast, opts, code) {
-    opts ||= {};
+    opts = opts || {};
 
     this.comments = ast.comments || [];
     this.tokens   = ast.tokens || [];
@@ -34,9 +34,10 @@ class CodeGenerator {
     }
 
     var format = {
+      retainLines: opts.retainLines,
       comments: opts.comments == null || opts.comments,
       compact: opts.compact,
-      quotes: CodeGenerator.findCommonStringDelimeter(code, tokens),
+      quotes: CodeGenerator.findCommonStringDelimiter(code, tokens),
       indent: {
         adjustMultilineComment: true,
         style: style,
@@ -48,14 +49,14 @@ class CodeGenerator {
       format.compact = code.length > 100000; // 100KB
 
       if (format.compact) {
-        console.error(messages.get("codeGeneratorDeopt", opts.filename, "100KB"));
+        console.error("[BABEL] " + messages.get("codeGeneratorDeopt", opts.filename, "100KB"));
       }
     }
 
     return format;
   }
 
-  static findCommonStringDelimeter(code, tokens) {
+  static findCommonStringDelimiter(code, tokens) {
     var occurences = {
       single: 0,
       double: 0
@@ -146,6 +147,22 @@ class CodeGenerator {
     return print;
   }
 
+  catchUp(node, parent) {
+    // catch up to this nodes newline if we're behind
+    if (node.loc && this.format.retainLines && this.buffer.buf) {
+      var needsParens = false;
+      if (parent && this.position.line < node.loc.start.line && t.isTerminatorless(parent)) {
+        needsParens = true;
+        this._push("(");
+      }
+      while (this.position.line < node.loc.start.line) {
+        this._push("\n");
+      }
+      return needsParens;
+    }
+    return false;
+  }
+
   print(node, parent, opts = {}) {
     if (!node) return;
 
@@ -197,6 +214,8 @@ class CodeGenerator {
 
       this.printLeadingComments(node, parent);
 
+      var needsParensFromCatchup = this.catchUp(node, parent);
+
       newline(true);
 
       if (opts.before) opts.before();
@@ -208,7 +227,7 @@ class CodeGenerator {
         this.newline();
         this.dedent();
       }
-      if (needsParens) this.push(")");
+      if (needsParens || needsParensFromCatchup) this.push(")");
 
       this.map.mark(node, "end");
       if (opts.after) opts.after();
@@ -328,6 +347,8 @@ class CodeGenerator {
 
       if (skip) return;
 
+      this.catchUp(comment);
+
       // whitespace before
       this.newline(this.whitespace.getNewlinesBefore(comment));
 
@@ -340,7 +361,6 @@ class CodeGenerator {
       }
 
       //
-
       if (comment.type === "Block" && this.format.indent.adjustMultilineComment) {
         var offset = comment.loc.start.column;
         if (offset) {
@@ -356,8 +376,13 @@ class CodeGenerator {
         val = this.getIndent() + val;
       }
 
-      //
+      // force a newline for line comments when retainLines is set in case the next printed node
+      // doesn't catch up
+      if (this.format.retainLines && comment.type === "Line") {
+        val += "\n";
+      }
 
+      //
       this._push(val);
 
       // whitespace after

src/babel/generation/node/index.js

@@ -85,16 +85,7 @@ export default class Node {
       return false;
     }
 
-    if (t.isYieldExpression(parent) || t.isAwaitExpression(parent)) {
-      return true;
-    }
-
-    if (t.isContinueStatement(parent) || t.isBreakStatement(parent) ||
-        t.isReturnStatement(parent) || t.isThrowStatement(parent)) {
-      return true;
-    }
-
-    return false;
+    return t.isTerminatorless(parent);
   }
 }
 

src/babel/generation/node/parentheses.js

@@ -171,4 +171,10 @@ export function ConditionalExpression(node, parent) {
   return false;
 }
 
-export { ConditionalExpression as AssignmentExpression };
+export function AssignmentExpression(node) {
+  if (t.isObjectPattern(node.left)) {
+    return true;
+  } else {
+    return ConditionalExpression(...arguments);
+  }
+}

src/babel/generation/node/whitespace.js

@@ -16,7 +16,7 @@ function crawl(node, state = {}) {
   } else if (t.isFunction(node)) {
     state.hasFunction = true;
   } else if (t.isIdentifier(node)) {
-    state.hasHelper ||= isHelper(node.callee);
+    state.hasHelper = state.hasHelper || isHelper(node.callee);
   }
 
   return state;

src/babel/messages.js

@@ -22,7 +22,19 @@ export const MESSAGES = {
   codeGeneratorDeopt: "Note: The code generator has deoptimised the styling of $1 as it exceeds the max of $2.",
   missingTemplatesDirectory: "no templates directory - this is most likely the result of a broken `npm publish`. Please report to https://github.com/babel/babel/issues",
   unsupportedOutputType: "Unsupported output type $1",
-  illegalMethodName: "Illegal method name $1"
+  illegalMethodName: "Illegal method name $1",
+  traverseNeedsParent: "Must pass a scope and parentPath unless traversing a Program/File got a $1 node",
+  traverseVerifyRootFunction: "You passed `traverse()` a function when it expected a visitor object, are you sure you didn't mean `{ enter: Function }`?",
+  traverseVerifyVisitorFunction: "Hey! You passed \`traverse()\` a visitor object with the key $1 that's a straight up `Function` instead of `{ enter: Function }`. You need to normalise it with `traverse.explode(visitor)`.",
+  traverseVerifyVisitorProperty: "You passed `traverse()` a visitor object with the property $1 that has the invalid property $2",
+
+  pluginIllegalKind: "Illegal kind $1 for plugin $2",
+  pluginIllegalPosition: "Illegal position $1 for plugin $2",
+  pluginKeyCollision: "The plugin $1 collides with another of the same name",
+  pluginNotTransformer: "The plugin $1 didn't export a Transformer instance",
+  pluginUnknown: "Unknown plugin $1",
+
+  transformerNotFile: "Transformer $1 is resolving to a different Babel version to what is doing the actual transformation..."
 };
 
 export function get(key: String, ...args) {

src/babel/patch.js

@@ -55,4 +55,18 @@ def("ExportNamedDeclaration")
   )])
   .field("source", or(def("ModuleSpecifier"), null));
 
+def("ExportNamespaceSpecifier")
+  .bases("Specifier")
+  .field("exported", def("Identifier"));
+
+def("ExportDefaultSpecifier")
+  .bases("Specifier")
+  .field("exported", def("Identifier"));
+
+def("ExportAllDeclaration")
+  .bases("Declaration")
+  .build("exported", "source")
+  .field("exported", def("Identifier"))
+  .field("source", def("Literal"));
+
 types.finalize();

src/babel/tools/resolve-rc.js

@@ -17,24 +17,40 @@ function exists(filename) {
 export default function (loc, opts = {}) {
   var rel = ".babelrc";
 
+  if (!opts.babelrc) {
+    opts.babelrc = [];
+  }
+
   function find(start, rel) {
     var file = path.join(start, rel);
 
+    if (opts.babelrc.indexOf(file) >= 0) {
+      return;
+    }
+
     if (exists(file)) {
       var content = fs.readFileSync(file, "utf8");
       var json;
 
       try {
-        json = jsons[content] ||= JSON.parse(stripJsonComments(content));
+        json = jsons[content] = jsons[content] || JSON.parse(stripJsonComments(content));
       } catch (err) {
         err.message = `${file}: ${err.message}`;
         throw err;
       }
 
+      opts.babelrc.push(file);
+
       if (json.breakConfig) return;
       merge(opts, json, function(a, b) {
         if (Array.isArray(a)) {
-          return a.concat(b);
+          var c = a.slice(0);
+          for (var v of b) {
+            if (a.indexOf(v) < 0) {
+              c.push(v);
+            }
+          }
+          return c;
         }
       });
     }
@@ -45,7 +61,7 @@ export default function (loc, opts = {}) {
     }
   }
 
-  if (opts.breakConfig !== true) {
+  if (opts.babelrc.indexOf(loc) < 0 && opts.breakConfig !== true) {
     find(loc, rel);
   }
 

src/babel/transformation/file/index.js

@@ -1,5 +1,7 @@
 import convertSourceMap from "convert-source-map";
 import * as optionParsers from "./option-parsers";
+import moduleFormatters from "../modules";
+import PluginManager from "./plugin-manager";
 import shebangRegex from "shebang-regex";
 import TraversalPath from "../../traversal/path";
 import isFunction from "lodash/lang/isFunction";
@@ -16,39 +18,42 @@ import Logger from "./logger";
 import parse from "../../helpers/parse";
 import Scope from "../../traversal/scope";
 import slash from "slash";
+import clone from "lodash/lang/clone";
 import * as util from  "../../util";
+import * as api from  "../../api/node";
 import path from "path";
 import each from "lodash/collection/each";
 import * as t from "../../types";
 
 var checkTransformerVisitor = {
-  enter(node, parent, scope, state) {
-    checkNode(state.stack, node, scope);
+  exit(node, parent, scope, state) {
+    checkPath(state.stack, this);
   }
 };
 
-function checkNode(stack, node, scope) {
+function checkPath(stack, path) {
   each(stack, function (pass) {
     if (pass.shouldRun || pass.ran) return;
-    pass.checkNode(node, scope);
+    pass.checkPath(path);
   });
 }
 
 export default class File {
-  constructor(opts = {}) {
-    this.dynamicImportAbsoluteDefaults = [];
-    this.dynamicImportIds              = {};
-    this.dynamicImports                = [];
+  constructor(opts = {}, pipeline) {
+    this.dynamicImportTypes = {};
+    this.dynamicImportIds   = {};
+    this.dynamicImports     = [];
 
-    this.usedHelpers = {};
-    this.dynamicData = {};
-    this.data        = {};
-    this.uids        = {};
+    this.declarations = {};
+    this.usedHelpers  = {};
+    this.dynamicData  = {};
+    this.data         = {};
+    this.uids         = {};
 
-    this.lastStatements = [];
-    this.log            = new Logger(this, opts.filename || "unknown");
-    this.opts           = this.normalizeOptions(opts);
-    this.ast            = {};
+    this.pipeline = pipeline;
+    this.log      = new Logger(this, opts.filename || "unknown");
+    this.opts     = this.normalizeOptions(opts);
+    this.ast      = {};
 
     this.buildTransformers();
   }
@@ -59,9 +64,9 @@ export default class File {
     "create-class",
     "create-decorated-class",
     "create-decorated-object",
+    "define-decorated-property-descriptor",
     "tagged-template-literal",
     "tagged-template-literal-loose",
-    "interop-require",
     "to-array",
     "to-consumable-array",
     "sliced-to-array",
@@ -73,6 +78,7 @@ export default class File {
     "define-property",
     "async-to-generator",
     "interop-require-wildcard",
+    "interop-require-default",
     "typeof",
     "extends",
     "get",
@@ -82,10 +88,17 @@ export default class File {
     "temporal-undefined",
     "temporal-assert-defined",
     "self-global",
-    "default-props"
+    "default-props",
+    "instanceof",
+
+    // legacy
+    "interop-require",
   ];
 
-  static soloHelpers = [];
+  static soloHelpers = [
+    "ludicrous-proxy-create",
+    "ludicrous-proxy-directory"
+  ];
 
   static options = require("./options");
 
@@ -117,13 +130,15 @@ export default class File {
         throw new Error("Deprecated option " + key + ": " + option.deprecated);
       }
 
-      if (val == null) val = option.default || val;
+      if (val == null) {
+        val = clone(option.default);
+      }
 
       var optionParser = optionParsers[option.type];
-      if (optionParser) val = optionParser(key, val);
+      if (optionParser) val = optionParser(key, val, this.pipeline);
 
       if (option.alias) {
-        opts[option.alias] ||= val;
+        opts[option.alias] = opts[option.alias] || val;
       } else {
         opts[key] = val;
       }
@@ -187,7 +202,7 @@ export default class File {
     var stack = [];
 
     // build internal transformers
-    each(transform.transformers, function (transformer, key) {
+    each(this.pipeline.transformers, function (transformer, key) {
       var pass = transformers[key] = transformer.buildPass(file);
 
       if (pass.canTransform()) {
@@ -206,8 +221,14 @@ export default class File {
     // init plugins!
     var beforePlugins = [];
     var afterPlugins = [];
+    var pluginManager = new PluginManager({
+      file: this,
+      transformers: this.transformers,
+      before: beforePlugins,
+      after: afterPlugins
+    });
     for (var i = 0; i < file.opts.plugins.length; i++) {
-      this.addPlugin(file.opts.plugins[i], beforePlugins, afterPlugins);
+      pluginManager.add(file.opts.plugins[i]);
     }
     stack = beforePlugins.concat(stack, afterPlugins);
 
@@ -216,7 +237,7 @@ export default class File {
   }
 
   getModuleFormatter(type: string) {
-    var ModuleFormatter = isFunction(type) ? type : transform.moduleFormatters[type];
+    var ModuleFormatter = isFunction(type) ? type : moduleFormatters[type];
 
     if (!ModuleFormatter) {
       var loc = util.resolveRelative(type);
@@ -230,57 +251,6 @@ export default class File {
     return new ModuleFormatter(this);
   }
 
-  addPlugin(name, before, after) {
-    var position = "before";
-    var plugin;
-
-    if (name) {
-      if (typeof name === "string") {
-        // this is a plugin in the form of "foobar" or "foobar:after"
-        // where the optional colon is the delimiter for plugin position in the transformer stack
-
-        [name, position = "before"] = name.split(":");
-
-        var loc = util.resolveRelative(name) || util.resolveRelative(`babel-plugin-${name}`);
-        if (loc) {
-          plugin = require(loc)
-        } else {
-          throw new ReferenceError(`Unknown plugin ${JSON.stringify(name)}`);
-        }
-      } else {
-        // not a string so we'll just assume that it's a direct Transformer instance, if not then
-        // the checks later on will complain
-        plugin = name;
-      }
-    } else {
-      throw new TypeError(`Ilegal kind ${typeof name} for plugin name ${JSON.stringify(name)}`);
-    }
-
-    // validate position
-    if (position !== "before" && position !== "after") {
-      throw new TypeError(`Plugin ${JSON.stringify(name)} has an illegal position of ${JSON.stringify(position)}`);
-    }
-
-    // validate transformer key
-    var key = plugin.key;
-    if (this.transformers[key]) {
-      throw new ReferenceError(`The key for plugin ${JSON.stringify(name)} of ${key} collides with an existing plugin`);
-    }
-
-    // validate Transformer instance
-    if (!plugin.buildPass || plugin.constructor.name !== "Transformer") {
-      throw new TypeError(`Plugin ${JSON.stringify(name)} didn't export a default Transformer instance`);
-    }
-
-    // build!
-    var pass = this.transformers[key] = plugin.buildPass(this);
-    if (pass.canTransform()) {
-      var stack = before;
-      if (position === "after") stack = after;
-      stack.push(pass);
-    }
-  }
-
   parseInputSourceMap(code: string) {
     var opts = this.opts;
 
@@ -334,8 +304,8 @@ export default class File {
     return source;
   }
 
-  addImport(source: string, name?: string, absoluteDefault?: boolean): Object {
-    name ||= source;
+  addImport(source: string, name?: string, type?: string): Object {
+    name = name || source;
     var id = this.dynamicImportIds[name];
 
     if (!id) {
@@ -345,7 +315,11 @@ export default class File {
       var specifiers = [t.importDefaultSpecifier(id)];
       var declar = t.importDeclaration(specifiers, t.literal(source));
       declar._blockHoist = 3;
-      if (absoluteDefault) this.dynamicImportAbsoluteDefaults.push(declar);
+
+      if (type) {
+        var modules = this.dynamicImportTypes[type] = this.dynamicImportTypes[type] || [];
+        modules.push(declar);
+      }
 
       if (this.transformers["es6.modules"].canTransform()) {
         this.moduleFormatter.importSpecifier(specifiers[0], declar, this.dynamicImports);
@@ -358,14 +332,10 @@ export default class File {
     return id;
   }
 
-  isConsequenceExpressionStatement(node: Object): boolean {
-    return t.isExpressionStatement(node) && this.lastStatements.indexOf(node) >= 0;
-  }
-
   attachAuxiliaryComment(node: Object): Object {
     var comment = this.opts.auxiliaryComment;
     if (comment) {
-      node.leadingComments ||= [];
+      node.leadingComments = node.leadingComments || [];
       node.leadingComments.push({
         type: "Line",
         value: " " + comment
@@ -383,8 +353,8 @@ export default class File {
 
     var program = this.ast.program;
 
-    var declar = program._declarations && program._declarations[name];
-    if (declar) return declar.id;
+    var declar = this.declarations[name];
+    if (declar) return declar;
 
     this.usedHelpers[name] = true;
 
@@ -401,11 +371,11 @@ export default class File {
 
     var ref = util.template("helper-" + name);
     ref._compact = true;
-    var uid = this.scope.generateUidIdentifier(name);
+    var uid = this.declarations[name] = this.scope.generateUidIdentifier(name);
     this.scope.push({
-      key: name,
       id: uid,
-      init: ref
+      init: ref,
+      unique: true
     });
     return uid;
   }
@@ -462,9 +432,12 @@ export default class File {
     parseOpts.strictMode = features.strict;
     parseOpts.sourceType = "module";
 
+    this.log.debug("Parse start");
+
     //
 
     return parse(parseOpts, code, (tree) => {
+      this.log.debug("Parse stop");
       this.transform(tree);
       return this.generate();
     });
@@ -487,25 +460,25 @@ export default class File {
   }
 
   transform(ast) {
-    this.log.debug();
-
+    this.log.debug("Start set AST");
     this.setAst(ast);
+    this.log.debug("End set AST");
 
-    this.lastStatements = t.getLastStatements(ast.program);
+    this.log.debug("Start prepass");
+    this.checkPath(this.path);
+    this.log.debug("End prepass");
 
+    this.log.debug("Start module formatter init");
     var modFormatter = this.moduleFormatter = this.getModuleFormatter(this.opts.modules);
     if (modFormatter.init && this.transformers["es6.modules"].canTransform()) {
       modFormatter.init();
     }
-
-    this.checkNode(ast);
+    this.log.debug("End module formatter init");
 
     this.call("pre");
-
     each(this.transformerStack, function (pass) {
       pass.transform();
     });
-
     this.call("post");
   }
 
@@ -518,20 +491,19 @@ export default class File {
     }
   }
 
-  checkNode(node, scope) {
-    if (Array.isArray(node)) {
-      for (var i = 0; i < node.length; i++) {
-        this.checkNode(node[i], scope);
+  checkPath(path) {
+    if (Array.isArray(path)) {
+      for (var i = 0; i < path.length; i++) {
+        this.checkPath(path[i]);
       }
       return;
     }
 
     var stack = this.transformerStack;
-    scope ||= this.scope;
 
-    checkNode(stack, node, scope);
+    checkPath(stack, path);
 
-    scope.traverse(node, checkTransformerVisitor, {
+    path.traverse(checkTransformerVisitor, {
       stack: stack
     });
   }
@@ -581,10 +553,14 @@ export default class File {
     if (opts.ast) result.ast = ast;
     if (!opts.code) return result;
 
+    this.log.debug("Generation start");
+
     var _result = generate(ast, opts, this.code);
     result.code = _result.code;
     result.map  = _result.map;
 
+    this.log.debug("Generation end");
+
     if (this.shebang) {
       // add back shebang
       result.code = `${this.shebang}\n${result.code}`;

src/babel/transformation/file/logger.js

@@ -7,7 +7,7 @@ export default class Logger {
   }
 
   _buildMessage(msg: string): string {
-    var parts = this.filename;
+    var parts = `[BABEL] ${this.filename}`;
     if (msg) parts += `: ${msg}`;
     return parts;
   }
@@ -18,7 +18,7 @@ export default class Logger {
 
   deprecate(msg) {
     if (!this.file.opts.suppressDeprecationMessages) {
-      console.error(msg);
+      console.error(this._buildMessage(msg));
     }
   }
 

src/babel/transformation/file/option-parsers.js

@@ -1,14 +1,13 @@
-import transform from "./../index";
 import * as util from  "../../util";
 
-export function transformerList(key, val) {
+export function transformerList(key, val, pipeline) {
   val = util.arrayify(val);
 
   if (val.indexOf("all") >= 0 || val.indexOf(true) >= 0) {
-    val = Object.keys(transform.transformers);
+    val = Object.keys(pipeline.transformers);
   }
 
-  return transform._ensureTransformerNames(key, val);
+  return pipeline._ensureTransformerNames(key, val);
 }
 
 export function number(key, val) {

src/babel/transformation/file/options.json

@@ -15,11 +15,23 @@
     "hidden": true
   },
 
+  "extra": {
+    "hidden": true,
+    "default": {}
+  },
+
   "moduleId": {
     "description": "specify a custom name for module ids",
     "type": "string"
   },
 
+  "retainLines": {
+    "hidden": true,
+    "type": "boolean",
+    "default": false,
+    "description": "retain line numbers - will result in really ugly code"
+  },
+
   "nonStandard": {
     "type": "boolean",
     "default": true,
@@ -152,7 +164,7 @@
   },
 
   "externalHelpers": {
-    "type": "string",
+    "type": "boolean",
     "default": false,
     "shorthand": "r",
     "description": "uses a reference to `babelHelpers` instead of placing helpers at the top of your code."
@@ -201,6 +213,10 @@
     "default": false,
     "hidden": true,
     "description": "stop trying to load .babelrc files"
-  }
+  },
 
+  "babelrc": {
+    "hidden": true,
+    "description": "do not load the same .babelrc file twice"
+  }
 }

src/babel/transformation/file/plugin-manager.js

@@ -0,0 +1,105 @@
+import * as node from  "../../api/node";
+import * as messages from "../../messages";
+import * as util from  "../../util";
+
+export default class PluginManager {
+  static memoisedPlugins = [];
+
+  static memoisePluginContainer(fn) {
+    for (var i = 0; i < PluginManager.memoisedPlugins.length; i++) {
+      var plugin = PluginManager.memoisedPlugins[i];
+      if (plugin.container === fn) return plugin.transformer;
+    }
+
+    var transformer = fn(node);
+    PluginManager.memoisedPlugins.push({
+      container: fn,
+      transformer: transformer
+    });
+    return transformer;
+  }
+
+  static positions = ["before", "after"];
+
+  constructor({ file, transformers, before, after } = { transformers: {}, before: [], after: [] }) {
+    this.transformers = transformers;
+    this.file         = file;
+    this.before       = before;
+    this.after        = after;
+  }
+
+  subnormaliseString(name, position) {
+    // this is a plugin in the form of "foobar" or "foobar:after"
+    // where the optional colon is the delimiter for plugin position in the transformer stack
+
+    var match = name.match(/^(.*?):(after|before)$/);
+    if (match) [, name, position] = match;
+
+    var loc = util.resolveRelative(name) || util.resolveRelative(`babel-plugin-${name}`);
+    if (loc) {
+      return {
+        position: position,
+        plugin:   require(loc)
+      };
+    } else {
+      throw new ReferenceError(messages.get("pluginUnknown", name));
+    }
+  }
+
+  validate(name, plugin) {
+    // validate transformer key
+    var key = plugin.key;
+    if (this.transformers[key]) {
+      throw new ReferenceError(messages.get("pluginKeyCollision", key));
+    }
+
+    // validate Transformer instance
+    if (!plugin.buildPass || plugin.constructor.name !== "Transformer") {
+      throw new TypeError(messages.get("pluginNotTransformer", name));
+    }
+  }
+
+  add(name) {
+    var position;
+    var plugin;
+
+    if (name) {
+      if (typeof name === "object" && name.transformer) {
+        ({ plugin: name, position } = name);
+      } else if (typeof name !== "string") {
+        // not a string so we'll just assume that it's a direct Transformer instance, if not then
+        // the checks later on will complain
+        plugin = name;
+      }
+
+      if (typeof name === "string") {
+        ({ plugin, position } = this.subnormaliseString(name, position));
+      }
+    } else {
+      throw new TypeError(messages.get("pluginIllegalKind", typeof name, name));
+    }
+
+    // default position
+    position = position || "before";
+
+    // validate position
+    if (PluginManager.positions.indexOf(position) < 0) {
+      throw new TypeError(messages.get("pluginIllegalPosition", position, name));
+    }
+
+    // allow plugin containers to be specified so they don't have to manually require
+    if (typeof plugin === "function") {
+      plugin = PluginManager.memoisePluginContainer(plugin);
+    }
+
+    //
+    this.validate(name, plugin);
+
+    // build!
+    var pass = this.transformers[plugin.key] = plugin.buildPass(this.file);
+    if (pass.canTransform()) {
+      var stack = position === "before" ? this.before : this.after;
+      stack.push(pass);
+    }
+  }
+}

src/babel/transformation/helpers/build-binary-assignment-operator-transformer.js

@@ -10,9 +10,13 @@ export default function (exports, opts) {
     return t.assignmentExpression("=", left, right);
   };
 
+  exports.shouldVisit = function (node) {
+    return node.operator && (node.operator === opts.operator || node.operator === opts.operator + "=");
+  };
+
   exports.ExpressionStatement = function (node, parent, scope, file) {
     // hit the `AssignmentExpression` one below
-    if (file.isConsequenceExpressionStatement(node)) return;
+    if (this.isCompletionRecord()) return;
 
     var expr = node.expression;
     if (!isAssignment(expr)) return;

src/babel/transformation/helpers/build-conditional-assignment-operator-transformer.js

@@ -8,7 +8,7 @@ export default function (exports, opts) {
 
   exports.ExpressionStatement = function (node, parent, scope, file) {
     // hit the `AssignmentExpression` one below
-    if (file.isConsequenceExpressionStatement(node)) return;
+    if (this.isCompletionRecord()) return;
 
     var expr = node.expression;
     if (!opts.is(expr, file)) return;

src/babel/transformation/helpers/build-react-transformer.js

@@ -57,6 +57,8 @@ export default function (exports, opts) {
 
   exports.JSXOpeningElement = {
     exit(node, parent, scope, file) {
+      parent.children = react.buildChildren(parent);
+
       var tagExpr = node.name;
       var args = [];
 
@@ -144,10 +146,6 @@ export default function (exports, opts) {
   };
 
   exports.JSXElement = {
-    enter(node) {
-      node.children = react.buildChildren(node);
-    },
-
     exit(node) {
       var callExpr = node.openingElement;
 

src/babel/transformation/helpers/define-map.js

@@ -15,7 +15,7 @@ export function push(mutatorMap, node, kind, file) {
 
   //
 
-  map._inherits ||= [];
+  map._inherits = map._inherits || [];
   map._inherits.push(node);
 
   map._key = node.key;
@@ -25,7 +25,7 @@ export function push(mutatorMap, node, kind, file) {
   }
 
   if (node.decorators) {
-    var decorators = map.decorators ||= t.arrayExpression([]);
+    var decorators = map.decorators = map.decorators || t.arrayExpression([]);
     decorators.elements = decorators.elements.concat(node.decorators.map(dec => dec.expression));
   }
 

src/babel/transformation/helpers/memoise-decorators.js

@@ -0,0 +1,37 @@
+import * as t from "../../types";
+
+export default function (decorators, scope) {
+  for (var i = 0; i < decorators.length; i++) {
+    var decorator = decorators[i];
+    var expression = decorator.expression;
+    if (!t.isMemberExpression(expression)) continue;
+
+    var temp = scope.generateMemoisedReference(expression.object);
+    var ref;
+
+    var nodes = [];
+
+    if (temp) {
+      ref = temp;
+      nodes.push(t.assignmentExpression("=", temp, expression.object));
+    } else {
+      ref = expression.object;
+    }
+
+    nodes.push(t.callExpression(
+      t.memberExpression(
+        t.memberExpression(ref, expression.property, expression.computed),
+        t.identifier("bind")
+      ),
+      [ref]
+    ));
+
+    if (nodes.length === 1) {
+      decorator.expression = nodes[0];
+    } else {
+      decorator.expression = t.sequenceExpression(nodes);
+    }
+  }
+
+  return decorators;
+}

src/babel/transformation/helpers/name-method.js

@@ -20,27 +20,32 @@ var visitor = {
 
 var wrap = function (state, method, id, scope) {
   if (state.selfReference) {
-    var templateName = "property-method-assignment-wrapper";
-    if (method.generator) templateName += "-generator";
-    var template = util.template(templateName, {
-      FUNCTION: method,
-      FUNCTION_ID: id,
-      FUNCTION_KEY: scope.generateUidIdentifier(id.name)
-    });
-    template.callee._skipModulesRemap = true;
+    if (scope.hasBinding(id.name)) {
+      // we can just munge the local binding
+      scope.rename(id.name);
+    } else {
+      // need to add a wrapper since we can't change the references
+      var templateName = "property-method-assignment-wrapper";
+      if (method.generator) templateName += "-generator";
+      var template = util.template(templateName, {
+        FUNCTION: method,
+        FUNCTION_ID: id,
+        FUNCTION_KEY: scope.generateUidIdentifier(id.name)
+      });
+      template.callee._skipModulesRemap = true;
 
-    // shim in dummy params to retain function arity, if you try to read the
-    // source then you'll get the original since it's proxied so it's all good
-    var params = template.callee.body.body[0].params;
-    for (var i = 0, len = getFunctionArity(method); i < len; i++) {
-      params.push(scope.generateUidIdentifier("x"));
+      // shim in dummy params to retain function arity, if you try to read the
+      // source then you'll get the original since it's proxied so it's all good
+      var params = template.callee.body.body[0].params;
+      for (var i = 0, len = getFunctionArity(method); i < len; i++) {
+        params.push(scope.generateUidIdentifier("x"));
+      }
+
+      return template;
     }
-
-    return template;
-  } else {
-    method.id = id;
-    return method;
   }
+
+  method.id = id;
 };
 
 var visit = function (node, name, scope) {
@@ -82,7 +87,7 @@ var visit = function (node, name, scope) {
       // so we can safely just set the id and move along as it shadows the
       // bound function id
     }
-  } else {
+  } else if (state.outerDeclar || scope.hasGlobal(name)) {
     scope.traverse(node, visitor, state);
   }
 
@@ -96,7 +101,7 @@ export function custom(node, id, scope) {
 
 export function property(node, file, scope) {
   var key = t.toComputedKey(node, node.key);
-  if (!t.isLiteral(key)) return node; // we can't set a function id with this
+  if (!t.isLiteral(key)) return; // we can't set a function id with this
 
   var name = t.toIdentifier(key.value);
   if (name === "eval" || name === "arguments") name = "_" + name;
@@ -104,12 +109,12 @@ export function property(node, file, scope) {
 
   var method = node.value;
   var state  = visit(method, name, scope);
-  node.value = wrap(state, method, id, scope);
+  node.value = wrap(state, method, id, scope) || method;
 }
 
 export function bare(node, parent, scope) {
   // has an `id` so we don't need to infer one
-  if (node.id) return node;
+  if (node.id) return;
 
   var id;
   if (t.isProperty(parent) && parent.kind === "init" && (!parent.computed || t.isLiteral(parent.key))) {
@@ -118,8 +123,17 @@ export function bare(node, parent, scope) {
   } else if (t.isVariableDeclarator(parent)) {
     // var foo = function () {};
     id = parent.id;
+
+    if (t.isIdentifier(id)) {
+      var bindingInfo = scope.parent.getBinding(id.name);
+      if (bindingInfo && bindingInfo.constant && scope.getBinding(id.name) === bindingInfo) {
+        // always going to reference this method
+        node.id = id;
+        return;
+      }
+    }
   } else {
-    return node;
+    return;
   }
 
   var name;

src/babel/transformation/helpers/react.js

@@ -34,9 +34,8 @@ function cleanJSXElementLiteralChild(child, args) {
   var lines = child.value.split(/\r\n|\n|\r/);
 
   var lastNonEmptyLine = 0;
-  var i;
 
-  for (i = 0; i < lines.length; i++) {
+  for (let i = 0; i < lines.length; i++) {
     if (lines[i].match(/[^ \t]/)) {
       lastNonEmptyLine = i;
     }
@@ -44,7 +43,7 @@ function cleanJSXElementLiteralChild(child, args) {
 
   var str = "";
 
-  for (i = 0; i < lines.length; i++) {
+  for (let i = 0; i < lines.length; i++) {
     var line = lines[i];
 
     var isFirstLine = i === 0;

src/babel/transformation/helpers/remap-async-to-generator.js

@@ -20,7 +20,7 @@ var referenceVisitor = {
   enter(node, parent, scope, state) {
     var name = state.id.name;
     if (t.isReferencedIdentifier(node, parent, { name: name }) && scope.bindingIdentifierEquals(name, state.id)) {
-      return state.ref ||= scope.generateUidIdentifier(name);
+      return state.ref = state.ref || scope.generateUidIdentifier(name);
     }
   }
 };

src/babel/transformation/helpers/replace-supers.js

@@ -218,7 +218,7 @@ export default class ReplaceSupers {
       return this.setSuperProperty(node.left.property, node.right, node.left.computed, getThisReference());
     } else {
       // super.age += 2; -> var _ref = super.age; super.age = _ref + 2;
-      ref ||= path.scope.generateUidIdentifier("ref");
+      ref = ref || path.scope.generateUidIdentifier("ref");
       return [
         t.variableDeclaration("var", [
           t.variableDeclarator(ref, node.left)

src/babel/transformation/index.js

@@ -1,68 +1,34 @@
-import normalizeAst from "../helpers/normalize-ast";
-import Transformer from "./transformer";
-import object from "../helpers/object";
-import File from "./file";
-import each from "lodash/collection/each";
+import Pipeline from "./transformer-pipeline";
 
-export default function transform(code: string, opts?: Object) {
-  var file = new File(opts);
-  return file.parse(code);
-}
+var pipeline = new Pipeline;
 
-transform.fromAst = function (ast, code, opts) {
-  ast = normalizeAst(ast);
+//
 
-  var file = new File(opts);
-  file.addCode(code);
-  file.transform(ast);
-  return file.generate();
-};
+import transformers from "./transformers";
+pipeline.addTransformers(transformers);
 
-transform._ensureTransformerNames = function (type: string, rawKeys: Array<string>) {
-  var keys = [];
+//
 
-  for (var i = 0; i < rawKeys.length; i++) {
-    var key = rawKeys[i];
+import deprecated from "./transformers/deprecated";
+pipeline.addDeprecated(deprecated);
 
-    var deprecatedKey = transform.deprecatedTransformerMap[key];
-    var aliasKey = transform.aliasTransformerMap[key];
-    if (aliasKey) {
-      keys.push(aliasKey);
-    } else if (deprecatedKey) {
-      // deprecated key, remap it to the new one
-      console.error(`The transformer ${key} has been renamed to ${deprecatedKey}`);
-      rawKeys.push(deprecatedKey);
-    } else if (transform.transformers[key]) {
-      // valid key
-      keys.push(key);
-    } else if (transform.namespaces[key]) {
-      // namespace, append all transformers within this namespace
-      keys = keys.concat(transform.namespaces[key]);
-    } else {
-      // invalid key
-      throw new ReferenceError(`Unknown transformer ${key} specified in ${type}`);
-    }
-  }
+//
 
-  return keys;
-};
+import aliases from "./transformers/aliases";
+pipeline.addAliases(aliases);
 
-transform.transformerNamespaces = object();
-transform.transformers          = object();
-transform.namespaces            = object();
+//
 
-transform.deprecatedTransformerMap = require("./transformers/deprecated");
-transform.aliasTransformerMap = require("./transformers/aliases");
-transform.moduleFormatters = require("./modules");
+import * as filters from "./transformers/filters";
+pipeline.addFilter(filters.internal);
+pipeline.addFilter(filters.blacklist);
+pipeline.addFilter(filters.whitelist);
+pipeline.addFilter(filters.stage);
+pipeline.addFilter(filters.optional);
 
-import rawTransformers from "./transformers";
+//
 
-each(rawTransformers, function (transformer, key) {
-  var namespace = key.split(".")[0];
-
-  transform.namespaces[namespace] ||= [];
-  transform.namespaces[namespace].push(key);
-  transform.transformerNamespaces[key] = namespace;
-
-  transform.transformers[key] = new Transformer(key, transformer);
-});
+var transform = pipeline.transform.bind(pipeline);
+transform.fromAst = pipeline.transformFromAst.bind(pipeline);
+transform.pipeline = pipeline;
+export default transform;

src/babel/transformation/modules/_default.js

@@ -49,11 +49,12 @@ var remapVisitor = {
     if (node._skipModulesRemap) {
       return this.skip();
     }
+  },
 
+  exit(node, parent, scope, formatter) {
     if (t.isAssignmentExpression(node) && !node._ignoreModulesRemap) {
       var exported = formatter.getExport(node.left, scope);
       if (exported) {
-        this.skip();
         return formatter.remapExportAssignment(node, exported);
       }
     }
@@ -123,6 +124,11 @@ export default class DefaultFormatter {
     this.getLocalImports();
   }
 
+  isModuleType(node, type) {
+    var modules = this.file.dynamicImportTypes[type];
+    return modules && modules.indexOf(node) >= 0;
+  }
+
   transform() {
     this.remapAssignments();
   }
@@ -160,7 +166,7 @@ export default class DefaultFormatter {
   }
 
   _addExport(name, exported) {
-    var info = this.localExports[name] ||= {
+    var info = this.localExports[name] = this.localExports[name] || {
       binding: this.scope.getBindingIdentifier(name),
       exported: []
     };

src/babel/transformation/modules/amd.js

@@ -80,7 +80,9 @@ export default class AMDFormatter extends DefaultFormatter {
       this.defaultIds[key] = specifier.local;
     }
 
-    if (includes(this.file.dynamicImportAbsoluteDefaults, node)) {
+    if (this.isModuleType(node, "absolute")) {
+      // absolute module reference
+    } else if (this.isModuleType(node, "absoluteDefault")) {
       // prevent unnecessary renaming of dynamic imports
       this.ids[node.source.value] = ref;
       ref = t.memberExpression(ref, t.identifier("default"));
@@ -105,6 +107,7 @@ export default class AMDFormatter extends DefaultFormatter {
 
   exportSpecifier(specifier, node, nodes) {
     if (this.doDefaultExportInterop(specifier)) {
+      this.passModuleArg = true;
       nodes.push(util.template("exports-default-assign", {
         VALUE: specifier.local
       }, true));

src/babel/transformation/modules/common.js

@@ -20,7 +20,7 @@ export default class CommonJSFormatter extends DefaultFormatter {
       if (this.file.isLoose("es6.modules")) templateName += "-loose";
       var declar = util.template(templateName, true);
       declar._blockHoist = 3;
-      file.ast.program.body.unshift(declar);
+      file.path.unshiftContainer("body", [declar]);
     }
   }
 
@@ -45,7 +45,9 @@ export default class CommonJSFormatter extends DefaultFormatter {
 
     // import foo from "foo";
     if (t.isSpecifierDefault(specifier)) {
-      if (includes(this.file.dynamicImportAbsoluteDefaults, node)) {
+      if (this.isModuleType(node, "absolute")) {
+        // absolute module reference
+      } else if (this.isModuleType(node, "absoluteDefault")) {
         this.internalRemap[variableName.name] = ref;
       } else if (this.noInteropRequireImport) {
         this.internalRemap[variableName.name] = t.memberExpression(ref, t.identifier("default"));
@@ -53,7 +55,7 @@ export default class CommonJSFormatter extends DefaultFormatter {
         var uid = this.scope.generateUidBasedOnNode(node, "import");
 
         nodes.push(t.variableDeclaration("var", [
-          t.variableDeclarator(uid, t.callExpression(this.file.addHelper("interop-require-wildcard"), [ref]))
+          t.variableDeclarator(uid, t.callExpression(this.file.addHelper("interop-require-default"), [ref]))
         ]));
 
         this.internalRemap[variableName.name] = t.memberExpression(uid, t.identifier("default"));
@@ -104,13 +106,16 @@ export default class CommonJSFormatter extends DefaultFormatter {
     var call = t.callExpression(t.identifier("require"), [node.source]);
     var uid;
 
-    if (includes(this.file.dynamicImportAbsoluteDefaults, node)) {
+    if (this.isModuleType(node, "absolute")) {
+      // absolute module reference
+    } else if (this.isModuleType(node, "absoluteDefault")) {
       call = t.memberExpression(call, t.identifier("default"));
-      uid = node.specifiers[0].local;
     } else {
       uid = this.scope.generateUidBasedOnNode(node, "import");
     }
 
+    uid = uid || node.specifiers[0].local;
+
     var declar = t.variableDeclaration("var", [
       t.variableDeclarator(uid, call)
     ]);

src/babel/transformation/modules/system.js

@@ -77,11 +77,11 @@ var runnerSettersVisitor = {
 
 export default class SystemFormatter extends AMDFormatter {
   constructor(file) {
+    super(file);
+
     this.exportIdentifier = file.scope.generateUidIdentifier("export");
     this.noInteropRequireExport = true;
     this.noInteropRequireImport = true;
-
-    DefaultFormatter.apply(this, arguments);
   }
 
   _addImportSource(node, exportNode) {

src/babel/transformation/templates/call-instance-decorator.js

@@ -1 +0,0 @@
-this.KEY = INITIALIZERS.KEY.call(this);

src/babel/transformation/templates/call-static-decorator.js

@@ -1 +0,0 @@
-CONSTRUCTOR.KEY = INITIALIZERS.KEY.call(CONSTRUCTOR);

src/babel/transformation/templates/helper-create-decorated-class.js

@@ -23,7 +23,11 @@
             throw new TypeError("The decorator for method " + descriptor.key + " is of the invalid type " + typeof decorator);
           }
         }
-        if (initializers) initializers[key] = descriptor.initializer;
+
+        if (descriptor.initializer !== undefined) {
+          initializers[key] = descriptor;
+          continue;
+        }
       }
 
       Object.defineProperty(target, key, descriptor);

src/babel/transformation/templates/helper-create-decorated-object.js

@@ -13,7 +13,7 @@
 
     descriptor.enumerable = true;
     descriptor.configurable = true;
-    if ("value" in descriptor) descriptor.writable = true;
+    descriptor.writable = true;
 
     if (decorators) {
       for (var f = 0; f < decorators.length; f++) {
@@ -26,7 +26,10 @@
       }
     }
 
-    Object.defineProperty(target, key, descriptor);
+    if (descriptor.initializer) {
+      descriptor.value = descriptor.initializer.call(target);
+      Object.defineProperty(target, key, descriptor);
+    }
   }
 
   return target;

src/babel/transformation/templates/helper-define-decorated-property-descriptor.js

@@ -0,0 +1,13 @@
+(function (target, key, descriptors) {
+  var _descriptor = descriptors[key];
+
+  // clone it
+  var descriptor = {};
+  for (var _key in _descriptor) descriptor[_key] = _descriptor[_key];
+
+  // initialize it
+  if (!descriptor.initializer) return;
+  descriptor.value = descriptor.initializer.call(target);
+
+  Object.defineProperty(target, key, descriptor);
+})

src/babel/transformation/templates/helper-define-property.js

@@ -1,7 +1,7 @@
 (function (obj, key, value) {
   return Object.defineProperty(obj, key, {
     value: value,
-    enumerable: key == null || typeof Symbol == "undefined" || key.constructor !== Symbol,
+    enumerable: true,
     configurable: true,
     writable: true
   });

src/babel/transformation/templates/helper-instanceof.js

@@ -0,0 +1,7 @@
+(function (left, right) {
+  if (right != null && right[Symbol.hasInstance]) {
+    return right[Symbol.hasInstance](left);
+  } else {
+    return left instanceof right;
+  }
+});

src/babel/transformation/templates/helper-interop-require-default.js

@@ -0,0 +1,3 @@
+(function (obj) {
+  return obj && obj.__esModule ? obj : { default: obj };
+})

src/babel/transformation/templates/helper-interop-require-wildcard.js

@@ -1,3 +1,14 @@
 (function (obj) {
-  return obj && obj.__esModule ? obj : { default: obj };
+  if (obj && obj.__esModule) {
+    return obj;
+  } else {
+    var newObj = {};
+    if (obj != null) {
+      for (var key in obj) {
+        if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key];
+      }
+    }
+    newObj.default = obj;
+    return newObj;
+  }
 })

src/babel/transformation/templates/helper-ludicrous-proxy-create.js

@@ -0,0 +1,4 @@
+(function (proxy, directory) {
+  directory.push(proxy);
+  return proxy;
+})

src/babel/transformation/templates/helper-ludicrous-proxy-directory.js

@@ -0,0 +1 @@
+[];

src/babel/transformation/templates/property-method-assignment-wrapper-generator.js

@@ -1,6 +1,6 @@
 (function (FUNCTION_KEY) {
   function* FUNCTION_ID() {
-    return yield* FUNCTION_ID.apply(this, arguments);
+    return yield* FUNCTION_KEY.apply(this, arguments);
   }
 
   FUNCTION_ID.toString = function () {

src/babel/transformation/transformer-pass.js

@@ -8,58 +8,35 @@ import traverse from "../traversal";
 
 export default class TransformerPass {
   constructor(file: File, transformer: Transformer) {
-    this.transformer = transformer;
-    this.shouldRun   = !transformer.check;
-    this.handlers    = transformer.handlers;
-    this.file        = file;
-    this.ran         = false;
+    this.shouldTransform = !transformer.shouldVisit;
+    this.transformer     = transformer;
+    this.handlers        = transformer.handlers;
+    this.skipKey         = transformer.skipKey;
+    this.file            = file;
+    this.ran             = false;
   }
 
   canTransform(): boolean {
-    var transformer = this.transformer;
-
-    var opts = this.file.opts;
-    var key  = transformer.key;
-
-    // internal
-    if (key[0] === "_") return true;
-
-    // blacklist
-    var blacklist = opts.blacklist;
-    if (blacklist.length && includes(blacklist, key)) return false;
-
-    // whitelist
-    var whitelist = opts.whitelist;
-    if (whitelist) return includes(whitelist, key);
-
-    // stage
-    var stage = transformer.metadata.stage;
-    if (stage != null && stage >= opts.stage) return true;
-
-    // optional
-    if (transformer.metadata.optional && !includes(opts.optional, key)) return false;
-
-    return true;
+    return this.file.pipeline.canTransform(this.transformer, this.file.opts);
   }
 
-  checkNode(node: Object): boolean {
-    var check = this.transformer.check;
-    if (check) {
-      return this.shouldRun = check(node);
-    } else {
-      return true;
-    }
+  checkPath(path: TraversalPath): boolean {
+    if (this.shouldTransform || this.ran) return;
+
+    this.shouldTransform = this.transformer.shouldVisit(path.node);
   }
 
   transform() {
-    if (!this.shouldRun) return;
+    if (!this.shouldTransform) return;
 
     var file = this.file;
 
-    file.log.debug(`Running transformer ${this.transformer.key}`);
+    file.log.debug(`Start transformer ${this.transformer.key}`);
 
     traverse(file.ast, this.handlers, file.scope, file);
 
+    file.log.debug(`Finish transformer ${this.transformer.key}`);
+
     this.ran = true;
   }
 }

src/babel/transformation/transformer-pipeline.js

@@ -0,0 +1,100 @@
+import Transformer from "./transformer";
+import normalizeAst from "../helpers/normalize-ast";
+import assign from "lodash/object/assign";
+import object from "../helpers/object";
+import File from "./file";
+
+export default class TransformerPipeline {
+  constructor() {
+    this.transformers = object();
+    this.namespaces   = object();
+    this.deprecated   = object();
+    this.aliases      = object();
+    this.filters      = [];
+  }
+
+  addTransformers(transformers) {
+    for (var key in transformers) {
+      this.addTransformer(key, transformers[key]);
+    }
+    return this;
+  }
+
+  addTransformer(key, transformer) {
+    if (this.transformers[key]) throw new Error(); // todo: error
+
+    var namespace = key.split(".")[0];
+    this.namespaces[namespace] = this.namespaces[namespace] || [];
+    this.namespaces[namespace].push(key);
+    this.namespaces[key] = namespace;
+
+    this.transformers[key] = new Transformer(key, transformer);
+  }
+
+  addAliases(names) {
+    assign(this.aliases, names);
+    return this;
+  }
+
+  addDeprecated(names) {
+    assign(this.deprecated, names);
+    return this;
+  }
+
+  addFilter(filter: Function) {
+    this.filters.push(filter);
+    return this;
+  }
+
+  canTransform(transformer, fileOpts) {
+    for (var filter of (this.filters: Array)) {
+      var result = filter(transformer, fileOpts);
+      if (result != null) return result;
+    }
+
+    return true;
+  }
+
+  transform(code: string, opts?: Object) {
+    var file = new File(opts, this);
+    return file.parse(code);
+  }
+
+  transformFromAst(ast, code, opts) {
+    ast = normalizeAst(ast);
+
+    var file = new File(opts, this);
+    file.addCode(code);
+    file.transform(ast);
+    return file.generate();
+  }
+
+  _ensureTransformerNames(type: string, rawKeys: Array<string>) {
+    var keys = [];
+
+    for (var i = 0; i < rawKeys.length; i++) {
+      var key = rawKeys[i];
+
+      var deprecatedKey = this.deprecated[key];
+      var aliasKey = this.aliases[key];
+      if (aliasKey) {
+        keys.push(aliasKey);
+      } else if (deprecatedKey) {
+        // deprecated key, remap it to the new one
+        console.error(`[BABEL] The transformer ${key} has been renamed to ${deprecatedKey}`);
+        rawKeys.push(deprecatedKey);
+      } else if (this.transformers[key]) {
+        // valid key
+        keys.push(key);
+      } else if (this.namespaces[key]) {
+        // namespace, append all transformers within this namespace
+        keys = keys.concat(this.namespaces[key]);
+      } else {
+        // invalid key
+        throw new ReferenceError(`Unknown transformer ${key} specified in ${type}`);
+      }
+    }
+
+    return keys;
+  }
+}

src/babel/transformation/transformer.js

@@ -1,4 +1,5 @@
 import TransformerPass from "./transformer-pass";
+import * as messages from "../messages";
 import isFunction from "lodash/lang/isFunction";
 import traverse from "../traversal";
 import isObject from "lodash/lang/isObject";
@@ -14,7 +15,7 @@ import each from "lodash/collection/each";
  */
 
 export default class Transformer {
-  constructor(transformerKey: key, transformer: Object, opts: Object) {
+  constructor(transformerKey: string, transformer: Object) {
     transformer = assign({}, transformer);
 
     var take = function (key) {
@@ -24,19 +25,34 @@ export default class Transformer {
     };
 
     this.manipulateOptions = take("manipulateOptions");
+    this.shouldVisit       = take("shouldVisit");
     this.metadata          = take("metadata") || {};
     this.parser            = take("parser");
-    this.check             = take("check");
     this.post              = take("post");
     this.pre               = take("pre");
 
+    //
+
     if (this.metadata.stage != null) {
       this.metadata.optional = true;
     }
 
+    //
+
     this.handlers = this.normalize(transformer);
-    this.opts     ||= {};
     this.key      = transformerKey;
+
+    //
+
+    if (!this.shouldVisit) {
+      var types = Object.keys(this.handlers);
+      this.shouldVisit = function (node) {
+        for (var i = 0; i < types.length; i++) {
+          if (node.type === types[i]) return true;
+        }
+        return false;
+      };
+    }
   }
 
   normalize(transformer: Object): Object {
@@ -71,7 +87,7 @@ export default class Transformer {
   buildPass(file: File): TransformerPass {
     // validate Transformer instance
     if (!(file instanceof File)) {
-      throw new TypeError(`Transformer ${this.key} is resolving to a different Babel version to what is doing the actual transformation...`);
+      throw new TypeError(messages.get("transformerNotFile", this.key));
     }
 
     return new TransformerPass(file, this);

src/babel/transformation/transformers/es5/properties.mutators.js

@@ -1,7 +1,7 @@
 import * as defineMap from "../../helpers/define-map";
 import * as t from "../../../types";
 
-export function check(node) {
+export function shouldVisit(node) {
   return t.isProperty(node) && (node.kind === "get" || node.kind === "set");
 }
 

src/babel/transformation/transformers/es6/arrow-functions.js

@@ -1,6 +1,6 @@
 import * as t from "../../../types";
 
-export var check = t.isArrowFunctionExpression;
+export var shouldVisit = t.isArrowFunctionExpression;
 
 export function ArrowFunctionExpression(node) {
   t.ensureBlock(node);

src/babel/transformation/transformers/es6/block-scoping.js

@@ -14,7 +14,7 @@ function isLet(node, parent) {
   if (isLetInitable(node, parent)) {
     for (var i = 0; i < node.declarations.length; i++) {
       var declar = node.declarations[i];
-      declar.init ||= t.identifier("undefined");
+      declar.init = declar.init || t.identifier("undefined");
     }
   }
 
@@ -37,7 +37,7 @@ function standardizeLets(declars) {
   }
 }
 
-export function check(node) {
+export function shouldVisit(node) {
   return t.isVariableDeclaration(node) && (node.kind === "let" || node.kind === "const");
 }
 
@@ -139,7 +139,12 @@ var hoistVarDeclarationsVisitor = {
   enter(node, parent, scope, self) {
     if (this.isForStatement()) {
       if (isVar(node.init, node)) {
-        node.init = t.sequenceExpression(self.pushDeclar(node.init));
+        var nodes = self.pushDeclar(node.init);
+        if (nodes.length === 1) {
+          node.init = nodes[0];
+        } else {
+          node.init = t.sequenceExpression(nodes);
+        }
       }
     } else if (this.isFor()) {
       if (isVar(node.left, node)) {
@@ -465,14 +470,14 @@ class BlockScoping {
     var declar;
 
     //
-    for (var i = 0; i < declarators.length; i++) {
+    for (let i = 0; i < declarators.length; i++) {
       declar = declarators[i];
       extend(this.outsideLetReferences, t.getBindingIdentifiers(declar));
     }
 
     //
     if (block.body) {
-      for (i = 0; i < block.body.length; i++) {
+      for (let i = 0; i < block.body.length; i++) {
         declar = block.body[i];
         if (isLet(declar, block)) {
           declarators = declarators.concat(declar.declarations);
@@ -481,7 +486,7 @@ class BlockScoping {
     }
 
     //
-    for (i = 0; i < declarators.length; i++) {
+    for (let i = 0; i < declarators.length; i++) {
       declar = declarators[i];
       var keys = t.getBindingIdentifiers(declar);
       extend(this.letReferences, keys);
@@ -606,7 +611,7 @@ class BlockScoping {
         for (var i = 0; i < cases.length; i++) {
           var caseConsequent = cases[i].consequent[0];
           if (t.isBreakStatement(caseConsequent) && !caseConsequent.label) {
-            caseConsequent.label = this.loopLabel ||= this.file.scope.generateUidIdentifier("loop");
+            caseConsequent.label = this.loopLabel = this.loopLabel || this.file.scope.generateUidIdentifier("loop");
           }
         }
 

src/babel/transformation/transformers/es6/classes.js

@@ -1,3 +1,4 @@
+import memoiseDecorators from "../../helpers/memoise-decorators";
 import ReplaceSupers from "../../helpers/replace-supers";
 import * as nameMethod from "../../helpers/name-method";
 import * as defineMap from "../../helpers/define-map";
@@ -10,7 +11,7 @@ import * as t from "../../../types";
 
 const PROPERTY_COLLISION_METHOD_NAME = "__initializeProperties";
 
-export var check = t.isClass;
+export var shouldVisit = t.isClass;
 
 export function ClassDeclaration(node, parent, scope, file) {
   return t.variableDeclaration("let", [
@@ -36,6 +37,22 @@ var collectPropertyReferencesVisitor = {
   }
 };
 
+var constructorVisitor = traverse.explode({
+  ThisExpression: {
+    enter(node, parent, scope, ref) {
+      return ref;
+    }
+  },
+
+  Function: {
+    enter(node) {
+      if (!node.shadow) {
+        this.skip();
+      }
+    }
+  }
+});
+
 var verifyConstructorVisitor = traverse.explode({
   MethodDefinition: {
     enter() {
@@ -50,7 +67,7 @@ var verifyConstructorVisitor = traverse.explode({
   },
 
   CallExpression: {
-    enter(node, parent, scope, state) {
+    exit(node, parent, scope, state) {
       if (this.get("callee").isSuper()) {
         state.hasBareSuper = true;
         state.bareSuper = this;
@@ -228,7 +245,7 @@ class ClassTransformer {
       if (body.length === 1) return t.toExpression(body[0]);
     } else {
       // infer class name if this is a nameless class expression
-      constructor = nameMethod.bare(constructor, this.parent, this.scope);
+      constructor = nameMethod.bare(constructor, this.parent, this.scope) || constructor;
 
       body.unshift(t.variableDeclaration("var", [
         t.variableDeclarator(classRef, constructor)
@@ -292,6 +309,10 @@ class ClassTransformer {
       var node = classBody[i];
       var path = classBodyPaths[i];
 
+      if (node.decorators) {
+        memoiseDecorators(node.decorators, this.scope);
+      }
+
       if (t.isMethodDefinition(node)) {
         var isConstructor = node.kind === "constructor";
         if (isConstructor) this.verifyConstructor(path);
@@ -326,7 +347,7 @@ class ClassTransformer {
       if (this.isNativeSuper) helperName = "class-super-native-constructor-call";
       constructorBody.body.push(util.template(helperName, {
         NATIVE_REF: this.nativeSuperRef,
-        CLASS_NAME: className,
+        CLASS_NAME: this.classRef,
         SUPER_NAME: this.superName
       }, true));
     }
@@ -529,34 +550,47 @@ class ClassTransformer {
 
     if (node.decorators) {
       var body = [];
-      if (node.value) body.push(t.returnStatement(node.value));
-      node.value = t.functionExpression(null, [], t.blockStatement(body));
+      if (node.value) {
+        body.push(t.returnStatement(node.value));
+        node.value = t.functionExpression(null, [], t.blockStatement(body));
+      } else {
+        node.value = t.literal(null);
+      }
       this.pushToMap(node, true, "initializer");
 
+      var initializers;
+      var body;
+      var target;
       if (node.static) {
-        this.staticPropBody.push(util.template("call-static-decorator", {
-          INITIALIZERS: this.staticInitializersId ||= this.scope.generateUidIdentifier("staticInitializers"),
-          CONSTRUCTOR:  this.classRef,
-          KEY:          node.key,
-        }, true));
+        initializers = this.staticInitializersId = this.staticInitializersId || this.scope.generateUidIdentifier("staticInitializers");
+        body = this.staticPropBody;
+        target = this.classRef;
       } else {
-        this.instancePropBody.push(util.template("call-instance-decorator", {
-          INITIALIZERS: this.instanceInitializersId ||= this.scope.generateUidIdentifier("instanceInitializers"),
-          KEY:          node.key
-        }, true));
+        initializers = this.instanceInitializersId = this.instanceInitializersId || this.scope.generateUidIdentifier("instanceInitializers");
+        body = this.instancePropBody;
+        target = t.thisExpression();
       }
+
+      body.push(t.expressionStatement(
+        t.callExpression(this.file.addHelper("define-decorated-property-descriptor"), [
+          target,
+          t.literal(node.key.name),
+          initializers
+        ])
+      ));
     } else {
-      if (!node.static && node.value) {
+      if (!node.value && !node.decorators) return;
+
+      if (node.static) {
+        // can just be added to the static map
+        this.pushToMap(node, true);
+      } else if (node.value) {
         // add this to the instancePropBody which will be added after the super call in a derived constructor
         // or at the start of a constructor for a non-derived constructor
         this.instancePropBody.push(t.expressionStatement(
           t.assignmentExpression("=", t.memberExpression(t.thisExpression(), node.key), node.value)
         ));
-        node.value = t.identifier("undefined");
       }
-
-      // can just be added to the static map
-      this.pushToMap(node, true);
     }
   }
 
@@ -571,6 +605,10 @@ class ClassTransformer {
       fnPath.scope.rename(this.classRef.name);
     }
 
+    if (this.isNativeSuper) {
+      fnPath.traverse(constructorVisitor, this.nativeSuperRef);
+    }
+
     var construct = this.constructor;
     var fn        = method.value;
 

src/babel/transformation/transformers/es6/constants.js

@@ -1,7 +1,7 @@
 import * as messages from "../../../messages";
 import * as t from "../../../types";
 
-export function check(node) {
+export function shouldVisit(node) {
   return t.isVariableDeclaration(node, { kind: "const" }) || t.isImportDeclaration(node);
 }
 

src/babel/transformation/transformers/es6/destructuring.js

@@ -1,7 +1,7 @@
 import * as messages from "../../../messages";
 import * as t from "../../../types";
 
-export var check = t.isPattern;
+export var shouldVisit = t.isPattern;
 
 export function ForOfStatement(node, parent, scope, file) {
   var left = node.left;
@@ -78,11 +78,11 @@ exports.Function = function (node, parent, scope, file) {
 
   if (!hasDestructuring) return;
 
-  file.checkNode(nodes);
   t.ensureBlock(node);
 
   var block = node.body;
   block.body = nodes.concat(block.body);
+  return node;
 };
 
 export function CatchClause(node, parent, scope, file) {
@@ -111,7 +111,7 @@ export function ExpressionStatement(node, parent, scope, file) {
   var expr = node.expression;
   if (expr.type !== "AssignmentExpression") return;
   if (!t.isPattern(expr.left)) return;
-  if (file.isConsequenceExpressionStatement(node)) return;
+  if (this.isCompletionRecord()) return;
 
   var destructuring = new DestructuringTransformer({
     operator: expr.operator,
@@ -200,7 +200,7 @@ export function VariableDeclaration(node, parent, scope, file) {
 
     for (i = 0; i < nodes.length; i++) {
       node = nodes[i];
-      declar ||= t.variableDeclaration(node.kind, []);
+      declar = declar || t.variableDeclaration(node.kind, []);
 
       if (!t.isVariableDeclaration(node) && declar.kind !== node.kind) {
         throw file.errorWithNode(node, messages.get("invalidParentForThisNode"));

src/babel/transformation/transformers/es6/for-of.js

@@ -2,7 +2,7 @@ import * as messages from "../../../messages";
 import * as util from  "../../../util";
 import * as t from "../../../types";
 
-export var check = t.isForOfStatement;
+export var shouldVisit = t.isForOfStatement;
 
 export function ForOfStatement(node, parent, scope, file) {
   if (this.get("right").isArrayExpression()) {

src/babel/transformation/transformers/es6/object-super.js

@@ -1,7 +1,7 @@
 import ReplaceSupers from "../../helpers/replace-supers";
 import * as t from "../../../types";
 
-export var check = t.isSuper;
+export var shouldVisit = t.isSuper;
 
 function Property(path, node, scope, getObjectRef, file) {
   if (!node.method) return;
@@ -32,7 +32,7 @@ function Property(path, node, scope, getObjectRef, file) {
 
 export function ObjectExpression(node, parent, scope, file) {
   var objectRef;
-  var getObjectRef = () => objectRef ||= scope.generateUidIdentifier("obj");
+  var getObjectRef = () => objectRef = objectRef || scope.generateUidIdentifier("obj");
 
   var propPaths = this.get("properties");
   for (var i = 0; i < node.properties.length; i++) {

src/babel/transformation/transformers/es6/parameters.default.js

@@ -2,7 +2,7 @@ import callDelegate from "../../helpers/call-delegate";
 import * as util from  "../../../util";
 import * as t from "../../../types";
 
-export function check(node) {
+export function shouldVisit(node) {
   return t.isFunction(node) && hasDefaults(node);
 }
 
@@ -45,7 +45,6 @@ exports.Function = function (node, parent, scope, file) {
       ARGUMENT_KEY:  t.literal(i),
       ARGUMENTS:     argsIdentifier
     }, true);
-    file.checkNode(defNode);
     defNode._blockHoist = node.params.length - i;
     body.push(defNode);
   };
@@ -97,4 +96,6 @@ exports.Function = function (node, parent, scope, file) {
   } else {
     node.body.body = body.concat(node.body.body);
   }
+
+  return node;
 };

src/babel/transformation/transformers/es6/parameters.rest.js

@@ -2,7 +2,7 @@ import isNumber from "lodash/lang/isNumber";
 import * as util from  "../../../util";
 import * as t from "../../../types";
 
-export var check = t.isRestElement;
+export var shouldVisit = t.isRestElement;
 
 var memberExpressionOptimisationVisitor = {
   enter(node, parent, scope, state) {
@@ -74,7 +74,6 @@ exports.Function = function (node, parent, scope, file) {
       var accessExpr = t.memberExpression(rest, t.literal(index), true);
       return t.variableDeclarator(elem, accessExpr);
     }));
-    file.checkNode(declar);
     node.body.body.unshift(declar);
   }
 
@@ -97,7 +96,7 @@ exports.Function = function (node, parent, scope, file) {
       candidate.replaceWith(argsId);
       optimizeMemberExpression(candidate.parent, node.params.length);
     }
-    return;
+    return node;
   }
 
   //
@@ -138,4 +137,5 @@ exports.Function = function (node, parent, scope, file) {
   });
   loop._blockHoist = node.params.length + 1;
   node.body.body.unshift(loop);
+  return node;
 };

src/babel/transformation/transformers/es6/properties.computed.js

@@ -84,7 +84,7 @@ function spec(node, body, objId, initProps, file) {
   }
 }
 
-export function check(node) {
+export function shouldVisit(node) {
   return t.isProperty(node) && node.computed;
 }
 

src/babel/transformation/transformers/es6/properties.shorthand.js

@@ -1,6 +1,6 @@
 import * as t from "../../../types";
 
-export function check(node) {
+export function shouldVisit(node) {
   return t.isProperty(node) && (node.method || node.shorthand);
 }
 

src/babel/transformation/transformers/es6/regex.sticky.js

@@ -1,7 +1,7 @@
 import * as regex from "../../helpers/regex";
 import * as t from "../../../types";
 
-export function check(node) {
+export function shouldVisit(node) {
   return regex.is(node, "y");
 }
 

src/babel/transformation/transformers/es6/regex.unicode.js

@@ -1,7 +1,7 @@
 import rewritePattern from "regexpu/rewrite-pattern";
 import * as regex from "../../helpers/regex";
 
-export function check(node) {
+export function shouldVisit(node) {
   return regex.is(node, "u");
 }
 

src/babel/transformation/transformers/es6/spec.symbols.js

@@ -5,14 +5,16 @@ export var metadata = {
 };
 
 export function UnaryExpression(node, parent, scope, file) {
-  this.skip();
+  if (node._ignoreSpecSymbols) return;
 
   if (node.operator === "typeof") {
     var call = t.callExpression(file.addHelper("typeof"), [node.argument]);
     if (this.get("argument").isIdentifier()) {
       var undefLiteral = t.literal("undefined");
+      var unary = t.unaryExpression("typeof", node.argument);
+      unary._ignoreSpecSymbols = true;
       return t.conditionalExpression(
-        t.binaryExpression("===", t.unaryExpression("typeof", node.argument), undefLiteral),
+        t.binaryExpression("===", unary, undefLiteral),
         undefLiteral,
         call
       );
@@ -21,3 +23,13 @@ export function UnaryExpression(node, parent, scope, file) {
     }
   }
 }
+
+export function BinaryExpression(node, parent, scope, file) {
+  if (node.operator === "instanceof") {
+    return t.callExpression(file.addHelper("instanceof"), [node.left, node.right]);
+  }
+}
+
+export function VariableDeclaration(node) {
+  if (node._generated) this.skip();
+}

src/babel/transformation/transformers/es6/spread.js

@@ -44,7 +44,7 @@ function build(props, scope) {
   return nodes;
 }
 
-export var check = t.isSpreadElement;
+export var shouldVisit = t.isSpreadElement;
 
 export function ArrayExpression(node, parent, scope) {
   var elements = node.elements;

src/babel/transformation/transformers/es6/tail-call.js

@@ -101,23 +101,23 @@ class TailCallTransformer {
   }
 
   getArgumentsId() {
-    return this.argumentsId ||= this.scope.generateUidIdentifier("arguments");
+    return this.argumentsId = this.argumentsId || this.scope.generateUidIdentifier("arguments");
   }
 
   getThisId() {
-    return this.thisId ||= this.scope.generateUidIdentifier("this");
+    return this.thisId = this.thisId || this.scope.generateUidIdentifier("this");
   }
 
   getLeftId() {
-    return this.leftId ||= this.scope.generateUidIdentifier("left");
+    return this.leftId = this.leftId || this.scope.generateUidIdentifier("left");
   }
 
   getFunctionId() {
-    return this.functionId ||= this.scope.generateUidIdentifier("function");
+    return this.functionId = this.functionId || this.scope.generateUidIdentifier("function");
   }
 
   getAgainId() {
-    return this.againId ||= this.scope.generateUidIdentifier("again");
+    return this.againId = this.againId || this.scope.generateUidIdentifier("again");
   }
 
   getParams() {

src/babel/transformation/transformers/es6/template-literals.js

@@ -4,7 +4,7 @@ var buildBinaryExpression = function (left, right) {
   return t.binaryExpression("+", left, right);
 };
 
-export function check(node) {
+export function shouldVisit(node) {
   return t.isTemplateLiteral(node) || t.isTaggedTemplateExpression(node);
 }
 

src/babel/transformation/transformers/es7/async-functions.js

@@ -2,6 +2,6 @@ export var metadata = {
   stage: 1
 };
 
-export function check() {
+export function shouldVisit() {
   return false;
 }

src/babel/transformation/transformers/es7/class-properties.js

@@ -2,6 +2,6 @@ export var metadata = {
   stage: 0
 };
 
-export function check() {
+export function shouldVisit() {
   return false;
 }

src/babel/transformation/transformers/es7/decorators.js

@@ -1,3 +1,4 @@
+import memoiseDecorators from "../../helpers/memoise-decorators";
 import * as defineMap from "../../helpers/define-map";
 import * as t from "../../../types";
 
@@ -6,7 +7,7 @@ export var metadata = {
   stage: 1
 };
 
-export function check(node) {
+export function shouldVisit(node) {
   return !!node.decorators;
 }
 
@@ -24,7 +25,18 @@ export function ObjectExpression(node, parent, scope, file) {
   var mutatorMap = {};
 
   for (var i = 0; i < node.properties.length; i++) {
-    defineMap.push(mutatorMap, node.properties[i], null, file);
+    var prop = node.properties[i];
+    if (prop.decorators) memoiseDecorators(prop.decorators, scope);
+
+
+    if (prop.kind === "init") {
+      prop.kind = "";
+      prop.value = t.functionExpression(null, [], t.blockStatement([
+        t.returnStatement(prop.value)
+      ]));
+    }
+
+    defineMap.push(mutatorMap, prop, "initializer", file);
   }
 
   var obj = defineMap.toClassObject(mutatorMap);

src/babel/transformation/transformers/es7/do-expressions.js

@@ -5,7 +5,7 @@ export var metadata = {
   stage: 0
 };
 
-export var check = t.isDoExpression;
+export var shouldVisit = t.isDoExpression;
 
 export function DoExpression(node) {
   var body = node.body.body;

src/babel/transformation/transformers/es7/export-extensions.js

@@ -6,7 +6,7 @@ export var metadata = {
   stage: 1
 };
 
-export function check(node) {
+export function shouldVisit(node) {
   return t.isExportDefaultSpecifier(node) || t.isExportNamespaceSpecifier(node);
 }
 

src/babel/transformation/transformers/es7/trailing-function-commas.js

@@ -2,6 +2,6 @@ export var metadata = {
   stage: 1
 };
 
-export function check() {
+export function shouldVisit() {
   return false;
 }

src/babel/transformation/transformers/filters.js

@@ -0,0 +1,24 @@
+import includes from "lodash/collection/includes";
+
+export function internal(transformer, opts) {
+  if (transformer.key[0] === "_") return true;
+}
+
+export function blacklist(transformer, opts) {
+  var blacklist = opts.blacklist;
+  if (blacklist.length && includes(blacklist, transformer.key)) return false;
+}
+
+export function whitelist(transformer, opts) {
+  var whitelist = opts.whitelist;
+  if (whitelist) return includes(whitelist, transformer.key);
+}
+
+export function stage(transformer, opts) {
+  var stage = transformer.metadata.stage;
+  if (stage != null && stage >= opts.stage) return true;
+}
+
+export function optional(transformer, opts) {
+  if (transformer.metadata.optional && !includes(opts.optional, transformer.key)) return false;
+}

src/babel/transformation/transformers/index.js

@@ -1,4 +1,6 @@
 export default {
+  _modules:                                require("./internal/modules"),
+
   "es7.classProperties":                   require("./es7/class-properties"),
   "es7.trailingFunctionCommas":            require("./es7/trailing-function-commas"),
   "es7.asyncFunctions":                    require("./es7/async-functions"),
@@ -24,8 +26,6 @@ export default {
   reactCompat:                             require("./other/react-compat"),
   react:                                   require("./other/react"),
 
-  _modules:                                require("./internal/modules"),
-
   // needs to be before `regenerator` due to generator comprehensions
   // needs to be before `_shadowFunctions`
   "es7.comprehensions":                    require("./es7/comprehensions"),
@@ -94,8 +94,6 @@ export default {
 
   "spec.protoToAssign":                    require("./spec/proto-to-assign"),
 
-  _declarations:                           require("./internal/declarations"),
-
   _shadowFunctions:                        require("./internal/shadow-functions"),
 
   "es7.doExpressions":                     require("./es7/do-expressions"),
@@ -117,6 +115,6 @@ export default {
   "utility.inlineExpressions":             require("./utility/inline-expressions"),
   "utility.deadCodeElimination":           require("./utility/dead-code-elimination"),
 
-  flow:                                    require("./other/flow"),
-  _cleanUp:                                require("./internal/cleanup")
+  jscript:                                 require("./other/jscript"),
+  flow:                                    require("./other/flow")
 };