v2.7.2

Add support for React pre v0.12 transform

.gitmodules

@@ -0,0 +1,9 @@
+[submodule "vendor/traceur"]
+	path = vendor/traceur
+	url = https://github.com/google/traceur-compiler
+[submodule "vendor/regenerator"]
+	path = vendor/regenerator
+	url = https://github.com/facebook/regenerator
+[submodule "vendor/test262"]
+	path = vendor/test262
+	url = https://github.com/tc39/test262

CHANGELOG.md

@@ -1,6 +1,77 @@
 # Changelog
 
-Gaps between patch versions are faulty/broken releases.
+> **Tags:**
+> - [New Feature]
+> - [Bug Fix]
+> - [Spec Compliancy]
+> - [Breaking Change]
+> - [Documentation]
+> - [Internal]
+> - [Polish]
+
+_Note: Gaps between patch versions are faulty/broken releases._
+
+## 2.7.1
+
+ * **New Feature**
+  * Expose `version` on browser and node API.
+ * **Internal**
+  * Upgrade `core-js` to 0.4.1
+
+## 2.7.0
+
+ * **Spec Compliancy**
+  * Disallow reassignments of imports.
+ * **New Feature**
+  * `reactCompat` option to enable pre-v0.12 react components.
+
+## 2.6.3
+
+ * **Bug Fix**
+  * Fix 2.6.0 regression caused by faulty export default from a source handling.
+
+## 2.6.2
+
+ * **Bug Fix**
+  * Fix rest parameter keys when on functions with params.
+
+## 2.6.1
+
+ * **Bug Fix**
+  * Fix rest parameter arguments key.
+
+## 2.6.0
+
+ * **Bug Fix**
+  * Better handling of number literal property keys.
+  * Handle `NewExpression` paren insertion edegcases better.
+ * **Internal**
+  * Fix incorrect AST node `identifier("this")`.
+  * Better `toIdentifier` method that handles reserved words.
+  * Upgrade `acorn-6to5`.
+    * Fix exponentiation operator precedence.
+    * Fix line terminators after async contextual keywords.
+    * Add semicolons as class elements inside of a class body.
+  * Upgrade to `core-js` 4.0.0.
+  * Upgrade to `regenerator` 0.8.3.
+    * Fix non-loop labeled statements.
+ * **New Feature**
+  * Basic destructuring defaults
+  * Add `.es` to list of supported extensions.
+  * Add optional `typeofSymbol` transformer.
+  * Use a `for` loop for rest parameters instead of `Array.prototype.slice`.
+ * **Polish**
+  * Move `"use strict";` to inside module bodies instead of at the top of the file.
+  * Better handling of dynamic imports.
+ * **Spec Compliancy**
+  * Class inheritance now has a `function` or `null` type check.
+  * Add `interopRequireWildcard` around wildcard imports and exports to handle non-object exports.
+
+## 2.5.0
+
+ * Remove `noDuplicateProperties` transformer.
+ * Better generated UIDs based on nodes.
+ * Default parameters now use `arguments[i]`, conditionals and variable declarations instead of using long-form if statements.
 
 ## 2.4.10
 

Makefile

@@ -6,44 +6,7 @@ MOCHA_CMD = node_modules/mocha/bin/_mocha
 
 export NODE_ENV = test
 
-.PHONY: clean test test-cov test-clean lint test-travis test-spec test-browser publish bench build
-
-clean:
-	rm -rf coverage templates.json test/tmp dist
-
-bench:
-	npm install es6-transpiler traceur esnext es6now jstransform
-	node node_modules/matcha/bin/_matcha
-
-lint:
-	$(JSHINT_CMD) --reporter node_modules/jshint-stylish/stylish.js lib bin benchmark/index.js
-
-test-clean:
-	rm -rf test/tmp
-
-test: lint
-	$(MOCHA_CMD)
-	make test-clean
-
-test-cov:
-	rm -rf coverage
-	node $(ISTANBUL_CMD) $(MOCHA_CMD) --
-
-test-spec:
-	node $(ISTANBUL_CMD) $(MOCHA_CMD) -- --reporter spec
-
-test-travis: test-spec
-	if test -n "$$CODECLIMATE_REPO_TOKEN"; then codeclimate < coverage/lcov.info; fi
-
-test-browser:
-	mkdir -p dist
-
-	node bin/cache-templates
-	node bin/cache-tests
-	node $(BROWSERIFY_CMD) -e test/_browser.js >dist/6to5-test.js
-	rm -rf templates.json tests.json
-
-	test -n "`which open`" && open test/browser.html
+.PHONY: clean test test-cov test-clean lint test-travis test-simple test-all test-browser publish build bootstrap
 
 build:
 	mkdir -p dist
@@ -61,6 +24,48 @@ build:
 
 	rm -rf templates.json
 
+clean:
+	rm -rf coverage templates.json test/tmp dist
+
+lint:
+	$(JSHINT_CMD) --reporter node_modules/jshint-stylish/stylish.js lib bin
+
+test-clean:
+	rm -rf test/tmp
+
+test: lint
+	$(MOCHA_CMD)
+	make test-clean
+
+test-simple:
+	# excludes test262
+	export SIMPLE_6TO5_TESTS=1
+	make test
+
+test-all:
+	# includes traceur, esnext, regenerator
+	export ALL_6TO5_TESTS=1
+	make test
+
+test-cov:
+	export SIMPLE_6TO5_TESTS=1
+	rm -rf coverage
+	node $(ISTANBUL_CMD) $(MOCHA_CMD) --
+
+test-travis: bootstrap
+	node $(ISTANBUL_CMD) $(MOCHA_CMD) --
+	if test -n "$$CODECLIMATE_REPO_TOKEN"; then codeclimate < coverage/lcov.info; fi
+
+test-browser:
+	mkdir -p dist
+
+	node bin/cache-templates
+	node bin/cache-tests
+	node $(BROWSERIFY_CMD) -e test/_browser.js >dist/6to5-test.js
+	rm -rf templates.json tests.json
+
+	test -n "`which open`" && open test/browser.html
+
 publish:
 	git pull --rebase
 
@@ -81,3 +86,8 @@ publish:
 	git push --follow-tags
 
 	rm -rf templates.json browser.js runtime.js browser-polyfill.js
+
+bootstrap:
+	npm install
+	git submodule update --init
+	cd vendor/regenerator; npm install

NOTES.md

@@ -0,0 +1,8 @@
+# Notes
+
+ * Wildcard exports/imports wont normalise if `export default` is a non-object.
+
+## 3.0.0 breaking changes
+
+ * Remove `allowImportExportEverywhere` option from acorn.
+ * Remove this shorthand from playground.

benchmark/fixtures/all.js

@@ -1,99 +0,0 @@
-var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
-var obj = {};
-var foo = "foo";
-var bar = "bar";
-
-// constants
-const MULTIPLIER = 5;
-
-// classes
-class Foo {
-  constructor() {
-    this.foo = "bar";
-  }
-}
-
-class Bar extends Foo {
-  constructor() {
-    super();
-  }
-
-  // default parameters
-  go(foo = "bar", bar = "foo") {
-
-  }
-
-  // not supported by jstransform
-  //get foo() {
-  //  return this._foo;
-  //}
-  //set foo(val) {
-  //  this._foo = val + " foo!";
-  //}
-}
-
-// arrow functions
-arr.map(x => x * x);
-
-// block binding
-for (let key in arr) {
-  let val = arr[key];
-  console.log(key, val);
-}
-
-// computed property names
-obj = {
-  ["foo" + bar]: "foobar"
-};
-
-// destructuring
-var [a, [b], c, d] = ["hello", [", ", "junk"], ["world"]];
-console.log(a + b + c);
-
-// array comprehension
-// [for (i of [1, 2, 3]) i * i]; // not supported by es6now
-
-// for-of
-for (var i of [1, 2, 3]) {
-  console.log(i * i);
-}
-
-// property method assignment
-obj = {
-  foo() {
-    return "foobar";
-  },
-
-  get bar() {
-    return this._bar;
-  },
-
-  set bar(val) {
-    this._bar = val;
-  }
-};
-
-// property name shorthand
-function f(x, y) {
-  return { x, y };
-}
-
-// rest parameters
-function printList(name, ...items) {
-  console.log("list %s has the following items", name);
-  items.forEach(function (item) {
-    console.log(item);
-  });
-}
-
-// spread
-function add(x, y) {
-  return x + y;
-}
-var numbers = [5, 10];
-add(...numbers);
-
-// template literals
-var x = 5;
-var y = 10;
-console.log(`${x} + ${y} = ${x + y}`);

benchmark/index.js

@@ -1,168 +0,0 @@
-Error.stackTraceLimit = Infinity;
-
-var jsTrans = require("jstransform");
-var traceur = require("traceur");
-//var es6tr   = require("es6-transpiler");
-var es6now  = require("es6now");
-//var esnext  = require("esnext");
-var to5     = require("../lib/6to5");
-
-//var uglify  = require("uglify-js");
-var matcha  = require("matcha");
-var path    = require("path");
-var fs      = require("fs");
-var _       = require("lodash");
-
-var readResolve = function (filename) {
-  try {
-    filename = require.resolve(filename);
-  } catch (err) {
-    return null;
-  }
-  return fs.readFileSync(filename, "utf8");
-};
-
-var getVersion = function (name) {
-  return require(name + "/package.json").version;
-};
-
-var jsTransVisitors = [];
-
-_.each([
-  "arrow-function-visitors", "class-visitors", "destructuring-visitors",
-  "object-concise-method-visitors", "object-short-notation-visitors",
-  "rest-param-visitors", "template-visitors"
-], function (name) {
-  var mod = require("jstransform/visitors/es6-" + name);
-  jsTransVisitors = jsTransVisitors.concat(mod.visitorList);
-});
-
-
-var compilers = {
-  "6to5": {
-    version: getVersion(".."),
-    compile: function (code, filename) {
-      return to5.transform(code, { filename: filename }).code;
-    }
-  },
-
-  traceur: {
-    runtime: readResolve("traceur/bin/traceur-runtime.js"),
-    compile: function (code) {
-      return traceur.compile(code, {
-        modules: "commonjs",
-        experimental: true
-      });
-    }
-  },
-
-  /*esnext: {
-    runtime: readResolve("esnext/node_modules/regenerator/runtime.js") || readResolve("regenerator/runtime.js"),
-    compile: function (code) {
-      return esnext.compile(code).code;
-    }
-  },*/
-
-  es6now: {
-    runtime: readResolve("es6now/runtime/ES6.js"),
-    compile: function (code) {
-      return es6now.translate(code);
-    }
-  },
-
-  /*"es6-transpiler": {
-    compile: function (code) {
-      var result = es6tr.run({ src: code });
-      if (result.errors.length) throw new Error(result.join("; "));
-      return result.src;
-    }
-  },*/
-
-  jstransform: {
-    compile: function (code) {
-      return jsTrans.transform(jsTransVisitors, code).code;
-    }
-  }
-};
-
-// versions
-
-//var uglifyTitle = "uglify v" + getVersion("uglify-js");
-
-_.each(compilers, function (compiler, name) {
-  compiler.title = name + " v" + (compiler.version || getVersion(name));
-});
-
-//
-
-var sizeBenchmark = function (code, loc, name, compiler) {
-  var log = function (output, title) {
-    title = [compiler.title].concat(title || []).join(" + ");
-
-    var text;
-    var color;
-    if (output.stack) {
-      text = "error";
-      color = "red";
-    } else {
-      var kilo  = (output.length / 1024).toFixed(2);
-      text = kilo + "KB";
-      color = "cyan";
-    }
-
-    text = matcha.utils.color(matcha.utils.padBefore(text, 22), color);
-
-    console.log(text, matcha.utils.color("» " + title, "gray"));
-
-    if (output.stack) {
-      console.error(output.stack);
-    }
-  };
-
-  var go = function (getOutput, title) {
-    var code;
-    try {
-      code = getOutput();
-    } catch (err) {
-      log(err, title);
-      return;
-    }
-
-    log(code, title);
-  };
-
-  var output;
-  go(function () {
-    return output = compiler.compile(code, loc);
-  });
-  if (!output) return;
-
-  //go(function () {
-  //  return uglify.minify(output, { fromString: true }).code;
-  //}, uglifyTitle);
-};
-
-//
-
-_.each(fs.readdirSync(__dirname + "/fixtures"), function (name) {
-  var alias = path.basename(name, path.extname(name));
-
-  suite(alias, function () {
-    set("delay", 0);
-
-    var loc  = __dirname + "/fixtures/" + name;
-    var code = fs.readFileSync(loc, "utf8");
-
-    before(function () {
-      _.each(compilers, function (compiler, name) {
-        sizeBenchmark(code, loc, name, compiler);
-      });
-    });
-
-    _.each(compilers, function (compiler) {
-      bench(compiler.title, function () {
-        compiler.compile(code, loc);
-      });
-    });
-  });
-});

doc/browser.md

@@ -1,65 +0,0 @@
-# Browser
-
-A browser version of 6to5 is available from `browser.js` inside the 6to5
-directory in an npm release.
-
-## Scripts
-
-While it's not recommended for serious use, when the browser version is included
-all scripts with the type `text/ecmascript-6` and `text/6to5` are automatically
-compiled and ran.
-
-For example:
-
-```html
-<script src="node_modules/6to5/browser.js"></script>
-<script type="text/6to5">
-class Test {
-  test() {
-    return "test";
-  }
-}
-
-var test = new Test;
-test.test();
-</script>
-```
-
-## Build
-
-You can build a browser version of the compiler by running the following in the
-6to5 directory:
-
-```sh
-$ make build
-```
-
-This will output the files `dist/6to5.js` and `dist/6to5.min.js`.
-
-## Test
-
-To test 6to5 in your browser run:
-
-```sh
-$ make test-browser
-```
-
-And open `test/browser.html` in your browser if it doesn't open automatically.
-
-## API
-
-### to5.transform(code, [opts])
-
-See [options](usage.md#options) for additional documentation.
-
-```javascript
-to5.transform("class Test {}").code;
-```
-
-### to5.run(code, [opts])
-
-See [options](usage.md#options) for additional documentation.
-
-```javascript
-to5.run("class Test {}");
-```

doc/caveats.md

@@ -1,62 +0,0 @@
-# Caveats
-
-In order for certain features to work they require certain polyfills. You can
-satisfy **all** 6to5 feature requirements by using the included
-[polyfill](polyfill.md).
-
-You may alternatively selectively include what you need:
-
-| Feature                     | Requirements                                                                                                           |
-| --------------------------- | ---------------------------------------------------------------------------------------------------------------------- |
-| Abstract References         | [experimental](experimental.md), `Symbol`                                                                              |
-| Array destructuring         | `Array.from`                                                                                                           |
-| Async functions, Generators | [experimental](experimental.md), [regenerator runtime](https://github.com/facebook/regenerator/blob/master/runtime.js) |
-| Comprehensions              | [experimental](experimental.md), `Array.from`                                                                          |
-| For Of                      | `Symbol`, `prototype[Symbol.iterator]`                                                                                 |
-| Modules                     | `Object.assign`*                                                                                                       |
-| Object spread/rest          | [experimental](experimental.md), `Object.assign`                                                                       |
-| Spread                      | `Array.from`                                                                                                           |
-
-*Only required for exporting a non-function `default` with additional `export`s.
-
-## ES5
-
-Since 6to5 assumes that your code will be ran in an ES5 environment it uses ES5
-functions. So if you're using an environment that has limited or no support for
-ES5 such as lower versions of IE then using the
-[es5-shim](https://github.com/es-shims/es5-shim) along with the
-[6to5 polyfill](polyfill.md) will add support for these methods.
-
-## Internet Explorer
-
-### Classes (10 and below)
-
-If you're inheriting from a class then static properties are inherited from it
-via [\_\_proto\_\_](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto),
-this is widely supported but you may run into problems with much older browsers.
-
-**NOTE:** `__proto__` is not supported in IE <= 10 so static properties
-**will not** be inherited. A possible workaround is to use `super();`:
-
-```javascript
-class Foo {
-  static foo() {
-
-  }
-}
-
-class Bar extends Foo {
-  static foo() {
-    super();
-  }
-}
-```
-
-## Getters/setters (8 and below)
-
-In IE8 `Object.defineProperty` can only be used on DOM objects. This is
-unfortunate as it's required to set getters and setters. Due to this if
-you plan on supporting IE8 or below then the user of getters and setters
-isn't recommended.
-
-**Reference**: [MDN](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty#Internet_Explorer_8_specific_notes).

doc/differences.md

@@ -1,137 +0,0 @@
-# Differences
-
-There are three main points that separate 6to5 from all other transpilers.
-
-### Readable code
-
-The fundamental concept behind 6to5 is that the generated code must be close as
-possible to the original, retaining all the same formatting and readability.
-
-Many other transpilers are just concerned with making the code work while 6to5
-is concerned with making sure it works **and** is readable at the same time.
-
-For example, given the following array comprehension:
-
-```javascript
-var seattlers = [for (c of customers) if (c.city == "Seattle") { name: c.name, age: c.age }];
-```
-
-is generated to the following with 6to5:
-
-```javascript
-var seattlers = Array.from(customers).filter(function (c) {
-  return c.city == "Seattle";
-}).map(function (c) {
-  return {
-    name: c.name,
-    age: c.age
-  };
-});
-```
-
-The following is what Traceur generates:
-
-```javascript
-var seattlers = (function() {
-  var c;
-  var $__20 = 0,
-      $__21 = [];
-  for (var $__22 = customers[$traceurRuntime.toProperty(Symbol.iterator)](),
-      $__23; !($__23 = $__22.next()).done; ) {
-    c = $__23.value;
-    if (c.city == "Seattle")
-      $traceurRuntime.setProperty($__21, $__20++, {
-        name: c.name,
-        age: c.age
-      });
-  }
-  return $__21;
-}());
-```
-
-As you can tell, it's not very pretty. Instead of mapping directly to a
-runtime, like other transpilers, 6to5 maps directly to the equivalent ES5.
-
-Sometimes there are little inline functions that 6to5 needs. These are
-placed at the top of your file much like coffee-script does. If these
-bother you then you can use the [optional runtime](optional-runtime.md).
-We promise that these inline functions will never be significant and will
-always be used as little as possible.
-
-### Static analysis
-
-6to5 uses a lot of static analysis to simplify code as much as possible.
-Not many other transpilers do this, and those that do don't do it nearly
-as much as 6to5. This process is pretty intensive but it leads to higher
-quality code.
-
-### Spec compliancy
-
-6to5 prides itself on
-[spec compliancy](https://kangax.github.io/compat-table/es6/). We have
-excellent support for edgecases, something that many other transpilers
-suffer from, including Traceur. When you use 6to5 you can be confident
-that when you turn it off and use your code in a full ES6 environment
-**it'll just work**.
-
-## Comparison to other transpilers
-
-### Features
-
-|                              | 6to5 | Traceur | es6-transpiler | esnext | es6now | jstransform |
-| ---------------------------- | ---- | ------- | -------------- | ------ | ------ | ----------- |
-| Source maps                  | ✓    | ✓       | ✓              | ✓      |        | ✓           |
-| No compiler global pollution | ✓    |         | ✓              | ✓      |        | ✓           |
-| Optional runtime             | ✓    |         | ✓              |        |        | ✓           |
-| Browser compiler             | ✓    | ✓       |                | ✓      |        |             |
-
-### Language Support
-
-|                              | 6to5 | Traceur | es6-transpiler | esnext | es6now | jstransform |
-| ---------------------------- | ---- | ------- | -------------- | ------ | ------ | ----------- |
-| Abstract references          | ✓    |         |                |        |        |             |
-| Array comprehension          | ✓    | ✓       | ✓              |        |        |             |
-| Arrow functions              | ✓    | ✓       | ✓              | ✓      | ✓      | ✓           |
-| Async functions              | ✓    | ✓       |                | ✓      |        |             |
-| Async generator functions    | ✓    | ✓       |                |        |        |             |
-| Classes                      | ✓    | ✓       | ✓              | ✓      | ✓      | ✓           |
-| Computed property names      | ✓    | ✓       | ✓              | ✓      | ✓      |             |
-| Constants                    | ✓    | ✓       | ✓              |        |        |             |
-| Default parameters           | ✓    | ✓       | ✓              | ✓      | ✓      |             |
-| Destructuring                | ✓    | ✓       | ✓              | ✓      | ✓      | ✓           |
-| Exponentiation operator      | ✓    | ✓       |                |        |        |             |
-| Flow types                   | ✓    |         |                |        |        | ✓           |
-| For-of                       | ✓    | ✓       | ✓              | ✓      | ✓      |             |
-| Generators                   | ✓    | ✓       |                | ✓      |        |             |
-| Generator comprehension      | ✓    | ✓       |                |        |        |             |
-| JSX                          | ✓    |         |                |        |        |             |
-| Let scoping                  | ✓    | ✓       | ✓              |        |        |             |
-| Modules                      | ✓    | ✓       |                |        | ✓      |             |
-| Object rest/spread           | ✓    |         |                |        |        | ✓           |
-| Property method assignment   | ✓    | ✓       | ✓              | ✓      | ✓      | ✓           |
-| Property name shorthand      | ✓    | ✓       | ✓              | ✓      | ✓      | ✓           |
-| Rest parameters              | ✓    | ✓       | ✓              | ✓      | ✓      | ✓           |
-| React                        | ✓    |         |                |        |        |             |
-| Spread                       | ✓    | ✓       | ✓              | ✓      | ✓      |             |
-| Template literals            | ✓    | ✓       | ✓              | ✓      | ✓      | ✓           |
-| Unicode regex                | ✓    | ✓       | ✓              |        |        |             |
-
-### [Traceur](https://github.com/google/traceur-compiler)
-
-Traceur requires quite a bulky runtime (~75KB) and produces quite verbose code.
-While this can be trimmed down by selectively building the runtime, it's an
-unnecessary step when a large runtime can be eliminated entirely.
-
-### [es6now](https://github.com/zenparsing/es6now)
-
-es6now doesn't output sourcemaps. This is cited as a positive as line-to-line
-mapping is the goal. This however obviously doesn't retain column mapping
-resulting in the output code not being very pleasant.
-
-### [es6-transpiler](https://github.com/termi/es6-transpiler)
-
-The es6-transpiler compiler requires shims to operate which pollutes the global
-scope resulting in possible collisions.
-
-es6-transpiler maps line-by-line, just like es6now, this results in the same
-issues such as lack of column information and unpleasant code output.

doc/experimental.md

@@ -1,8 +0,0 @@
-## Experimental
-
-6to5 also has experimental support for ES7 proposals. You can enable this with
-the `experimental: true` option when using the [Node API](#node) or
-`--experimental` when using the [CLI](#cli).
-
-**WARNING:** These proposals are subject to change so use with
-**extreme caution**.

doc/features.md

@@ -1,283 +0,0 @@
-# Features
-
-## Abstract references ([experimental](experimental.md)) ([spec](https://github.com/zenparsing/es-abstract-refs))
-
-```javascript
-foo::bar;
-foo::bar = baz;
-delete foo::bar;
-```
-
-## Array comprehensions ([experimental](experimental.md))
-
-```javascript
-var results = [for (c of customers) if (c.city == "Seattle") { name: c.name, age: c.age }]
-```
-
-## Arrow functions
-
-```javascript
-// Expression bodies
-var odds = evens.map(v => v + 1);
-var nums = evens.map((v, i) => v + i);
-
-// Statement bodies
-nums.forEach(v => {
-  if (v % 5 === 0)
-    fives.push(v);
-});
-
-// Lexical this
-var bob = {
-  _name: "Bob",
-  _friends: [],
-  printFriends() {
-    this._friends.forEach(f => {
-      console.log(this._name + " knows " + f);
-    });
-  }
-};
-```
-
-## Async functions ([experimental](experimental.md)) ([spec](https://github.com/lukehoban/ecmascript-asyncawait))
-
-```javascript
-async function chainAnimationsAsync(elem, animations) {
-  for (var anim of animations) {
-    await anim(elem);
-  }
-}
-```
-
-## Async generator functions ([experimental](experimental.md)) ([spec](https://github.com/jhusain/asyncgenerator))
-
-```javascript
-
-```
-
-## Classes
-
-```javascript
-class SkinnedMesh extends THREE.Mesh {
-  constructor(geometry, materials) {
-    super(geometry, materials);
-
-    this.idMatrix = SkinnedMesh.defaultMatrix();
-    this.bones = [];
-    this.boneMatrices = [];
-    //...
-  }
-
-  update(camera) {
-    //...
-    super.update();
-  }
-
-  static defaultMatrix() {
-    return new THREE.Matrix4();
-  }
-}
-```
-
-## Computed property names
-
-```javascript
-var foo = "foo";
-var bar = "bar";
-var obj = {
-  ["foo" + bar]: "heh",
-  ["bar" + foo]: "noo",
-  foo: "foo",
-  bar: "bar"
-};
-```
-
-## Constants
-
-```javascript
-const MULTIPLIER = 5;
-console.log(2 * MULTIPLIER);
-
-MULTIPLIER = 6; // error
-var MULTIPLIER; // error
-```
-
-## Default parameters
-
-```javascript
-function f(x, y = 12) {
-  // y is 12 if not passed (or passed as undefined)
-  return x + y;
-}
-f(3) == 15
-```
-
-## Destructuring
-
-```javascript
-// list matching
-var [a, , b] = [1,2,3];
-
-// object matching
-var { op: a, lhs: { op: b }, rhs: c } = getASTNode();
-
-// object matching shorthand
-// binds `op`, `lhs` and `rhs` in scope
-var { op, lhs, rhs } = getASTNode();
-
-// Can be used in parameter position
-function g({ name: x }) {
-  console.log(x);
-}
-g({ name: 5 });
-
-// Fail-soft destructuring
-var [a] = [];
-a === undefined;
-```
-
-## Exponentiation operator ([experimental](experimental.md)) ([spec](https://github.com/rwaldron/exponentiation-operator))
-
-```javascript
-var a = 2;
-a **= 2;
-
-var squared = 2 ** 2;
-```
-
-## For-of
-
-```javascript
-for (var i of [1, 2, 3]) {
-  console.log(i * i);
-}
-```
-
-## Generators
-
-```javascript
-function* fibonacci() {
-  var pre = 0, cur = 1;
-  for (;;) {
-    var temp = pre;
-    pre = cur;
-    cur += temp;
-    yield cur;
-  }
-}
-
-for (var n of fibonacci()) {
-  // truncate the sequence at 1000
-  if (n > 1000) break;
-  console.log(n);
-}
-```
-
-## Generator comprehensions ([experimental](experimental.md))
-
-```javascript
-var nums = [1, 2, 3, 4, 5, 6];
-var multiples = (for (i of nums) if (i % 2) i * i);
-assert.equal(multiples.next().value, 1);
-assert.equal(multiples.next().value, 9);
-assert.equal(multiples.next().value, 25);
-```
-
-## Let scoping
-
-```javascript
-for (let i in arr) {
-  let v = arr[i];
-}
-```
-
-## Modules
-
-```javascript
-import "foo";
-import foo from "foo";
-import * as foo from "foo";
-import {bar} from "foo";
-import {foo as bar} from "foo";
-
-export { test };
-export var test = 5;
-export function test() {}
-
-export default test;
-```
-
-## Numeric literals
-
-```javascript
-0b111110111 === 503; // true
-0o767 === 503; // true
-```
-
-## Object spread/rest ([experimental](experimental.md)) ([spec](https://github.com/sebmarkbage/ecmascript-rest-spread))
-
-```javascript
-var n = { x, y, ...z };
-var { x, y, ...z } = { x: 1, y: 2, a: 3, b: 4 };
-```
-
-## Property method assignment
-
-```javascript
-var obj = {
-  foo() {
-    return "foobar";
-  },
-
-  get bar() {
-    return this._bar;
-  },
-
-  set bar(val) {
-    this._bar = val;
-  }
-};
-```
-
-## Property name shorthand
-
-```javascript
-function f(x, y) {
-  return { x, y };
-}
-```
-
-## Rest parameters
-
-```javascript
-function f(x, ...y) {
-  // y is an Array
-  return x * y.length;
-}
-f(3, "hello", true) == 6
-```
-
-## Spread
-
-```javascript
-function f(x, y, z) {
-  return x + y + z;
-}
-// Pass each elem of array as argument
-f(...[1,2,3]) == 6
-```
-
-## Template literals
-
-```javascript
-var x = 5;
-var y = 10;
-console.log(`${x} + ${y} = ${x + y}`); // "5 + 10 = 15"
-```
-## Unicode regex
-
-```javascript
-var string = 'foo💩bar';
-var match = string.match(/foo(.)bar/u);
-console.log(match[1]);
-```

doc/index.md

@@ -1,62 +1 @@
-**6to5** turns ES6+ code into vanilla ES5, so you can use next generation features **today.**
-
- - **Readable** - formatting is retained if possible so your generated code is as similar as possible.
- - **Extensible** - with a large range of [plugins](plugins.md) and **browser support**.
- - **Lossless** - **source map support** so you can debug your compiled code with ease.
- - **Compact** - maps directly to the equivalent ES5 with **no runtime**[\*](caveats.md).
-
-## Installation
-
-It's as easy as:
-
-    $ npm install -g 6to5
-
-## Usage
-
-Once you've installed 6to5, there are multiple paths you can take depending on
-how you want to use it.
-
-6to5 will simply compile your ES6+ script to ES5 if you pass it as an argument
-to the command-line tool `6to5`:
-
-```sh
-$ 6to5 script.js
-```
-
-If you have a file written using ES6+ and you just want to run it, `6to5-node`
-has you covered:
-
-```sh
-$ 6to5-node script.js
-```
-
-And it doesn't end here! To see all the ways you can use 6to5, check out the
-[Usage](http://6to5.github.io/usage.html) page.
-
-## [Features](features.md)
-
- - [Abstract references](features.md#abstract-references) ([experimental](experimental.md))
- - [Array comprehension](features.md#array-comprehension) ([experimental](experimental.md))
- - [Async functions](features.md#async-functions) ([experimental](experimental.md))
- - [Async generator functions](features.md#async-generator-functions) ([experimental](experimental.md))
- - [Arrow functions](features.md#arrow-functions)
- - [Classes](features.md#classes)
- - [Computed property names](features.md#computed-property-names)
- - [Constants](features.md#constants)
- - [Default parameters](features.md#default-parameters)
- - [Destructuring](features.md#destructuring)
- - [Exponentiation operator](features.md#exponentiation-operator) ([experimental](experimental.md))
- - [For-of](features.md#for-of)
- - [Generators](features.md#generators)
- - [Generator comprehension](features.md#generator-comprehension) ([experimental](experimental.md))
- - [Let scoping](features.md#let-scoping)
- - [Modules](features.md#modules)
- - [Numeric literals](features.md#numeric-literals)
- - [Object rest/spread](features.md#object-rest-spread) ([experimental](experimental.md))
- - [Property method assignment](features.md#property-method-assignment)
- - [Property name shorthand](features.md#property-name-shorthand)
- - [React/JSX](react.md)
- - [Rest parameters](features.md#rest-parameters)
- - [Spread](features.md#spread)
- - [Template literals](features.md#template-literals)
- - [Unicode regex](features.md#unicode-regex)
+See [6to5.github.io/docs](https://github.com/6to5/6to5.github.io/tree/master/docs).

doc/modules.md

@@ -1,257 +0,0 @@
-# Modules
-
-## Usage
-
-### CLI
-
-```sh
-$ 6to5 --modules common script.js
-```
-
-### Node
-
-```javascript
-var to5 = require("6to5");
-to5.transform('import "foo";', { modules: "common" });
-```
-
-## Formats
-
- * [AMD](#amd)
- * [Common (Default)](#common-default)
- * [Ignore](#ignore)
- * [System](#system)
- * [UMD](#umd)
-
-### Common
-
-```sh
-$ 6to5 --modules common
-```
-
-**In**
-
-```javascript
-export default test;
-
-export {test};
-export var test = 5;
-
-import "foo";
-
-import foo from "foo";
-import * as foo from "foo";
-
-import {bar} from "foo";
-import {foo as bar} from "foo";
-```
-
-**Out**
-
-```javascript
-"use strict";
-
-var _interopRequire = function (obj) {
-  return obj && (obj["default"] || obj);
-};
-
-exports = module.exports = test;
-
-exports.test = test;
-var test = exports.test = 5;
-
-require("foo");
-
-var foo = _interopRequire(require("foo"));
-
-var foo = require("foo");
-
-var bar = require("foo").bar;
-var bar = require("foo").foo;
-```
-
-### AMD
-
-```sh
-$ 6to5 --modules amd
-```
-
-**In**
-
-```javascript
-import foo from "foo";
-
-export function bar() {
-  return foo("foobar");
-}
-```
-
-**Out**
-
-```javascript
-define(["exports", "foo"], function (exports, _foo) {
-  "use strict";
-
-  var _interopRequire = function (obj) {
-    return obj && (obj["default"] || obj);
-  };
-
-  exports.bar = bar;
-  var foo = _interopRequire(_foo);
-
-  function bar() {
-    return foo("foobar");
-  }
-});
-```
-
-You can optionally specify to include the module id (using the `--amd-module-id` argument):
-
-```javascript
-define("filename", ["exports", "foo"], function (exports, _foo) {})
-```
-
-### UMD
-
-```sh
-$ 6to5 --modules umd
-```
-
-**In**
-
-```javascript
-import foo from "foo";
-
-export function bar() {
-  return foo("foobar");
-}
-```
-
-**Out**
-
-```javascript
-(function (factory) {
-  if (typeof define === "function" && define.amd) {
-    define(["exports", "foo"], factory);
-  } else if (typeof exports !== "undefined") {
-    factory(exports, require("foo"));
-  }
-})(function (exports, _foo) {
-  "use strict";
-
-  var _interopRequire = function (obj) {
-    return obj && (obj["default"] || obj);
-  };
-
-  exports.bar = bar;
-  var foo = _interopRequire(_foo);
-
-  function bar() {
-    return foo("foobar");
-  }
-});
-```
-
-### Ignore
-
-```sh
-$ 6to5 --modules ignore
-```
-
-**In**
-
-```javascript
-import foo from "foo";
-
-export function bar() {
-  return foo("foobar");
-}
-```
-
-**Out**
-
-```javascript
-function bar() {
-  return foo("foobar");
-}
-```
-
-### System
-
-```sh
-$ 6to5 --modules system
-```
-
-**In**
-
-```javascript
-import foo from "foo";
-
-export function bar() {
-  return foo("foobar");
-}
-```
-
-**Out**
-
-```javascript
-System.register("bar", ["foo"], function (_export) {
-  "use strict";
-
-  var __moduleName = "bar";
-
-  var foo;
-  function bar() {
-    return foo("foobar");
-  }
-  return {
-    setters: [function (m) {
-      foo = m.default;
-    }],
-    execute: function () {
-      _export("bar", bar);
-    }
-  };
-});
-```
-
-## Custom
-
-You can alternatively specify module names instead of one of the built-in types.
-
-```sh
-$ 6to5 --modules custom-module-formatter
-```
-
-**node_modules/custom-module-formatter/index.js**
-
-```javascript
-module.exports = ModuleFormatter;
-
-function ModuleFormatter() {
-
-}
-
-ModuleFormatter.prototype.transform = function (ast) {
-  // this is ran after all transformers have had their turn at modifying the ast
-  // feel free to modify this however
-};
-
-ModuleFormatter.prototype.importDeclaration = function (node, nodes) {
-  // node is an ImportDeclaration
-};
-
-ModuleFormatter.prototype.importSpecifier = function (specifier, node, nodes) {
-  // specifier is an ImportSpecifier
-  // node is an ImportDeclaration
-};
-
-ModuleFormatter.prototype.exportDeclaration = function (node, nodes) {
-  // node is an ExportDeclaration
-};
-
-ModuleFormatter.prototype.exportSpecifier = function (specifier, node, nodes) {
-  // specifier is an ExportSpecifier
-  // node is an ExportDeclaration
-};
-```

doc/optional-runtime.md

@@ -1,57 +0,0 @@
-# Optional runtime
-
-6to5 has a few helper functions that'll be placed at the top of the generated
-code if needed so it's not inlined multiple times throughout that file. This may
-become an issue if you have multiple files, especially when you're sending them
-to the browser. gzip alleviates most of this concern but it's still not ideal.
-
-You can tell 6to5 to not place any declarations at the top of your files and
-instead just point them to a reference contained within the runtime.
-
-Simply use the following option if you're using the [Node API](usage.md#node):
-
-```javascript
-{
-  runtime: true
-}
-```
-
-or the following flag if you're using the [CLI](usage.md#cli):
-
-```ssh
-$ 6to5 --runtime
-```
-
-Then just include the runtime before your generated code.
-
-## Getting the runtime
-
-You can get the runtime via either:
-
-```sh
-$ 6to5-runtime
-```
-
-or
-
-```javascript
-require("6to5").runtime();
-```
-
-or from an npm release in `runtime.js` from the 6to5 directory.
-
-## Customising namespace
-
-You can also customise the runtime namespace by passing an optional namespace
-argument:
-
-```javascript
-require("6to5").runtime("myCustomNamespace");
-```
-
-```sh
-$ 6to5-runtime myCustomNamespace
-```
-
-See [Options - runtime](usage.md#options) for documentation on changing the
-reference in generated code.

doc/playground.md

@@ -1,140 +0,0 @@
-# Playground
-
-Playground is a proving ground for **possible** ES7 proposals.
-
-**NOTE: These features are in no way endorsed by Ecma International and are not a part of ES6. They might become a part of ECMAScript in the future.**
-
-## Usage
-
-    $ 6to5 --playground
-
-```javascript
-to5.transform("code", { playground: true });
-```
-
-**NOTE:** Enabling `playground` also enables [experimental support](experimental.md).
-
-## Features
-
- * [Memoization operator](#memoization-operator)
- * [Method binding](#method-binding)
- * [Method binding function shorthand](#method-binding-function-shorthand)
- * [Object getter memoization](#object-getter-memoization)
- * [This shorthand](#this-shorthand)
-
-### Memoization assignment operator
-
-The memoization assignment operator allows you to lazily set an object property.
-It checks whether there's a property defined on the object and if there isn't then
-the right hand value is set.
-
-This means that `obj.x` in the following `var x = { x: undefined }; obj.x ?= 2;`
-will still be `undefined` because it's already been defined on the object.
-
-```javascript
-var obj = {};
-obj.x ?= 2;
-obj.x; // 2
-
-obj = { x: 1 };
-obj.x ?= 2;
-obj.x; // 1
-
-obj = { x: undefined }
-obj.x ?= 2;
-obj.x; // undefined
-```
-
-```javascript
-var obj = {};
-obj.x ?= 2;
-```
-
-equivalent to
-
-```javascript
-var obj = {};
-if (!Object.prototype.hasOwnProperty.call(obj, "x")) obj.x = 2;
-```
-
-### Method binding
-
-```javascript
-var fn = obj#method;
-var fn = obj#method("foob");
-```
-
-equivalent to
-
-```javascript
-var fn = obj.method.bind(obj);
-var fn = obj.method.bind(obj, "foob");
-```
-
-### Method binding function shorthand
-
-```javascript
-["foo", "bar"].map(#toUpperCase); // ["FOO", "BAR"]
-[1.1234, 23.53245, 3].map(#toFixed(2)); // ["1.12", "23.53", "3.00"]
-```
-
-equivalent to
-
-```javascript
-["foo", "bar"].map(function (val) { return val.toUpperCase(); });
-[1.1234, 23.53245, 3].map(function (val) { return val.toFixed(2); });
-```
-
-### Object getter memoization
-
-```javascript
-var foo = {
-  memo bar() {
-    return complex();
-  }
-};
-
-class Foo {
-  memo bar() {
-    return complex();
-  }
-}
-```
-
-equivalent to
-
-```javascript
-var foo = {
-  get bar() {
-    return Object.defineProperty(this, "bar", {
-      value: complex(),
-      enumerable: true,
-      configurable: true,
-      writable: true
-    }).bar;
-  }
-};
-
-class Foo {
-  get bar() {
-    return Object.defineProperty(this, "bar", {
-      value: complex(),
-      enumerable: true,
-      configurable: true,
-      writable: true
-    }).bar;
-  }
-}
-```
-
-### This shorthand
-
-```javascript
-@foo
-```
-
-equivalent to
-
-```javascirpt
-this.foo
-```

doc/plugins.md

@@ -1,33 +0,0 @@
-# Plugins
-
-## Build systems
-
- - [Broccoli](https://github.com/6to5/broccoli-6to5-transpiler)
- - [Browserify](https://github.com/6to5/6to5ify)
- - [Brunch](https://github.com/6to5/6to5-brunch)
- - [Duo](https://github.com/6to5/duo6to5)
- - [Gobble](https://github.com/6to5/gobble-6to5)
- - [Gulp](https://github.com/6to5/gulp-6to5)
- - [Grunt](https://github.com/6to5/grunt-6to5)
- - [Sprockets](https://github.com/josh/sprockets-es6) or via [Browserify](https://github.com/6to5/6to5-rails)
- - [webpack](https://github.com/6to5/6to5-loader)
-
-## Integrations
-
- - [Isparta](https://github.com/douglasduteil/isparta) - Code coverage with `karma` and `instanbul` using 6to5
- - [JSXHint](https://github.com/STRML/JSXHint) - A wrapper around JSHint to allow linting of JSX files
-
-## Bridges
-
- - [Ruby](https://github.com/6to5/6to5-ruby)
-
-## Testing
-
- - [Jest](https://github.com/6to5/6to5-jest)
- - [Karma](https://github.com/6to5/karma-6to5-preprocessor)
- - [Mocha](https://github.com/6to5/6to5-mocha)
-
-## Misc
-
- - [Connect](https://github.com/6to5/6to5-connect)
- - [Jade](https://github.com/6to5/jade-6to5)

doc/polyfill.md

@@ -1,34 +0,0 @@
-# Polyfill
-
-6to5 includes a polyfill that includes a custom
-[regenerator runtime](https://github.com/facebook/regenerator/blob/master/runtime.js) and
-[core.js](https://github.com/zloirock/core-js).
-
-This will emulate a full ES6 environment. This polyfill is automatically loaded
-when using [6to5-node](usage.md#node) and [6to5/register](usage.md#register-hook).
-
-## Usage
-
-### Node/Browserify
-
-You need to include the polyfill require at the top the **entry point** to your
-application.
-
-```javascript
-require("6to5/polyfill");
-```
-
-Fortunately, this is automatically loaded when using:
-
-```javascript
-require("6to5/register");
-```
-
-### Browser
-
-Available from the `browser-polyfill.js` file within the 6to5 directory of an
-npm release. This needs to be included **before** all your compiled 6to5 code.
-You can either prepend it to your compiled code or include it in a `<script>`
-before it.
-
-**NOTE:** Do not `require` this via browserify etc, use `6to5/polyfill`.

doc/react.md

@@ -1,17 +0,0 @@
-# React/JSX
-
-6to5 has built-in support for React v0.12. Tags are automatically transformed to
-their equivalent `React.createElement(...)` and `displayName` is automatically
-inferred and added to all `React.createClass` calls.
-
-## Blacklist
-
-To disable this behaviour add `react` to your blacklist:
-
-```javascript
-to5.transform("code", { blacklist: ["react"] });
-```
-
-```sh
-$ 6to5 --blacklist react
-```

doc/usage.md

@@ -1,259 +0,0 @@
-# Usage
-
-## CLI
-
-Compile the file `script.js` and output it to stdout.
-
-```sh
-$ 6to5 script.js
-```
-
-Compile the file `script.js` and output it to `script-compiled.js`.
-
-```sh
-$ 6to5 script.js --out-file script-compiled.js
-```
-
-Compile the file `script.js` and output it to `script-compiled.js` and save a
-source map to `script-compiled.js.map`.
-
-```sh
-$ 6to5 script.js --source-maps --out-file script-compiled.js
-```
-
-Compile the file `script.js` and output it to `script-compiled.js` with a source
-map embedded in a comment at the bottom.
-
-```sh
-$ 6to5 script.js --source-maps-inline --out-file script-compiled.js
-```
-
-Compile the entire `src` directory and output it to the `lib` directory.
-
-```sh
-$ 6to5 src --out-dir lib
-```
-
-Compile the entire `src` directory and output it to the one concatenated file.
-
-```sh
-$ 6to5 src --out-file script-compiled.js
-```
-
-Pipe a file in via stdin and output it to `script-compiled.js`
-
-```sh
-$ 6to5 --out-file script-compiled.js < script.js
-```
-
-### Node
-
-Launch a repl.
-
-```sh
-$ 6to5-node
-```
-
-Evaluate code.
-
-```sh
-$ 6to5-node -e "class Test { }"
-```
-
-Compile and run `test.js`.
-
-```sh
-$ 6to5-node test
-```
-
-## Node
-
-```javascript
-var to5 = require("6to5");
-```
-
-### to5.transform(code, [opts]);
-
-```javascript
-var result = to5.transform("code();", options);
-result.code;
-result.map;
-result.ast;
-```
-
-### to5.transformFileSync(filename, [opts])
-
-```javascript
-to5.transformFileSync("filename.js", options).code;
-```
-
-### to5.transformFile(filename, [opts], callback)
-
-```javascript
-to5.transformFile("filename.js", options, function (err, result) {
-  result.code;
-});
-```
-
-### to5.transform.fromAst(ast, [code], [opts])
-
-```javascript
-var result = to5.transform.fromAst(ast, "var a = 2;", opts);
-result.code;
-result.map;
-result.ast;
-```
-
-#### Options
-
-```javascript
-{
-  // Filename for use in errors etc.
-  // Default: "unknown"
-  filename: "filename",
-
-  // Filename relative to `sourceRoot`
-  // Default: `filename` option.
-  filenameRelative: "",
-
-  // List of transformers to EXCLUDE.
-  // Run `6to5 --help` to see a full list of transformers.
-  blacklist: [],
-
-  // List of transformers to ONLY use.
-  // Run `6to5 --help` to see a full list of transformers.
-  whitelist: [],
-
-  // Module formatter to use
-  // Run `6to5 --help` to see a full list of module formatters.
-  // Default: "common"
-  modules: "common",
-
-  // If truthy, adds a `map` property to returned output.
-  // If set to "inline", a comment with a sourceMappingURL directive is added to
-  // the bottom of the returned code.
-  // Default: false
-  sourceMap: true,
-
-  // Set `file` on returned source map.
-  // Default: `filenameRelative` option.
-  sourceMapName: "filename",
-
-  // Set `sources[0]` on returned source map.
-  // Default: `filenameRelative` option.
-  sourceFileName: "filename",
-
-  // The root from which all sources are relative
-  // Default: `moduleRoot` option.
-  sourceRoot: "assets/scripts",
-
-  // Optional prefix for the AMD module formatter that will be prepend to the
-  // filename on module definitions
-  // Default: `sourceRoot` option.
-  moduleRoot: "my-app",
-
-  // If truthy, insert an explicit id for each defined AMD/System module.
-  // By default, AMD/System modules are anonymous.
-  // Default: false
-  moduleIds: true,
-
-  // Optionally replace all 6to5 helper declarations with a referenece to this
-  // variable. If set to `true` then the default namespace is used "to5Runtime".
-  // Default: false
-  runtime: true,
-
-  // Enable support for experimental ES7 features
-  // Default: false
-  experimental: true,
-
-  // Set this to `false` if you don't want the transformed AST in the returned
-  // result
-  // Default: true
-  ast: true,
-
-  // Set this to `false` if you don't want the transformed code in the returned
-  // result
-  // Default: true
-  code: true,
-
-  format: {
-    // Output comments in generated output
-    // Default: true
-    comments: true,
-
-    // Do not include superfluous whitespace characters and line terminators
-    // Default: false
-    compact: false,
-
-    indent: {
-      // Preserve parentheses in new expressions that have no arguments
-      // Default: true
-      parentheses: true,
-
-      // Adjust the indentation of multiline comments to keep asterisks vertically aligned
-      // Default: true
-      adjustMultilineComment: true,
-
-      // Indent string
-      // Default: "  "
-      style: "  ",
-
-      // Base indent level
-      // Default: 0
-      base: 0
-    }
-  }
-}
-```
-
-### Require hook
-
-All subsequent files required by node with the extensions `.es6` and `.js` will
-be transformed by 6to5. The polyfill specified in [Polyfill](polyfill.md) is
-also required; but this is automatically loaded when using:
-
-Source maps are automatically configured so if any errors a thrown then line
-number info is mapped and you'll get the correct source location.
-
-```javascript
-require("6to5/register");
-```
-
-**NOTE:** By default all requires to `node_modules` will be ignored. You can
-override this by passing an ignore regex via:
-
-```javascript
-require("6to5/register")({
-  // This will override `node_modules` ignoring - you can alternatively pass
-  // a regex
-  ignore: false
-});
-```
-
-**NOTE:** Using 6to5-node or `require("6to5/register")`, 6to5 will check what features are available in the current environment and blacklists them if they're supported.
-
-#### Options
-
-```javascript
-require("6to5/register")({
-  // Optional ignore regex - if any filenames **do** match this regex then they
-  // aren't compiled
-  ignore: /regex/,
-
-  // Optional only regex - if any filenames **don't** match this regex then they
-  // aren't compiled
-  only: /my_es6_folder/,
-
-  // See options above for usage
-  whitelist: [],
-  blacklist: [],
-
-  // This will remove the currently hooked extensions of .es6 and .js so you'll
-  // have to add them back if you want them to be used again.
-  extensions: [".js", ".es6"],
-
-  // Enables `roadrunner` cache that will save to a `.roadrunner.json` file in your cwd
-  // Do not check this into git as it's user-specific
-  cache: true
-});
-```

lib/6to5/browser.js

@@ -1,5 +1,7 @@
 var transform = module.exports = require("./transformation/transform");
 
+transform.version = require("../../package").version;
+
 transform.transform = transform;
 
 transform.run = function (code, opts) {

lib/6to5/file.js

@@ -10,11 +10,12 @@ var t         = require("./types");
 var _         = require("lodash");
 
 function File(opts) {
-  this.dynamicImports = [];
-  this.opts           = File.normaliseOptions(opts);
-  this.transformers   = this.getTransformers();
-  this.uids           = {};
-  this.ast            = {};
+  this.dynamicImports   = [];
+  this.dynamicImportIds = {};
+  this.opts             = File.normaliseOptions(opts);
+  this.transformers     = this.getTransformers();
+  this.uids             = {};
+  this.ast              = {};
 }
 
 File.helpers = [
@@ -29,12 +30,17 @@ File.helpers = [
   "object-without-properties",
   "has-own",
   "slice",
+  "bind",
   "define-property",
-  "async-to-generator"
+  "async-to-generator",
+  "interop-require-wildcard",
+  "typeof",
+  "exports-wildcard"
 ];
 
 File.excludeHelpersFromRuntime = [
-  "async-to-generator"
+  "async-to-generator",
+  "typeof"
 ];
 
 File.normaliseOptions = function (opts) {
@@ -42,6 +48,7 @@ File.normaliseOptions = function (opts) {
 
   _.defaults(opts, {
     experimental: false,
+    reactCompat:  false,
     playground:   false,
     whitespace:   true,
     moduleIds:    opts.amdModuleIds || false,
@@ -160,11 +167,20 @@ File.prototype.parseShebang = function (code) {
   return code;
 };
 
-File.prototype.addImport = function (id, source) {
-  var specifiers = [t.importSpecifier(t.identifier("default"), id)];
-  var declar = t.importDeclaration(specifiers, t.literal(source));
-  declar._blockHoist = 3;
-  this.dynamicImports.push(declar);
+File.prototype.addImport = function (source, name) {
+  name = name || source;
+  var id = this.dynamicImportIds[name];
+
+  if (!id) {
+    id = this.dynamicImportIds[name] = this.generateUidIdentifier(name);
+
+    var specifiers = [t.importSpecifier(t.identifier("default"), id)];
+    var declar = t.importDeclaration(specifiers, t.literal(source));
+    declar._blockHoist = 3;
+    this.dynamicImports.push(declar);
+  }
+
+  return id;
 };
 
 File.prototype.addHelper = function (name) {
@@ -273,7 +289,7 @@ File.prototype.generate = function () {
 };
 
 File.prototype.generateUid = function (name, scope) {
-  name = t.toIdentifier(name);
+  name = t.toIdentifier(name).replace(/^_+/, "");
 
   scope = scope || this.scope;
 

lib/6to5/generation/generator.js

@@ -148,11 +148,11 @@ CodeGenerator.prototype.print = function (node, parent, opts) {
   };
 
   if (this[node.type]) {
-    var needsCommentParens = t.isExpression(node) && node.leadingComments && node.leadingComments.length;
-    var needsParens        = needsCommentParens || n.needsParens(node, parent);
+    var needsNoLineTermParens = n.needsParensNoLineTerminator(node, parent);
+    var needsParens           = needsNoLineTermParens || n.needsParens(node, parent);
 
     if (needsParens) this.push("(");
-    if (needsCommentParens) this.indent();
+    if (needsNoLineTermParens) this.indent();
 
     this.printLeadingComments(node, parent);
 
@@ -163,7 +163,7 @@ CodeGenerator.prototype.print = function (node, parent, opts) {
 
     this[node.type](node, this.buildPrint(node), parent);
 
-    if (needsCommentParens) {
+    if (needsNoLineTermParens) {
       this.newline();
       this.dedent();
     }

lib/6to5/generation/generators/expressions.js

@@ -1,5 +1,6 @@
 var util = require("../../util");
 var t    = require("../../types");
+var _    = require("lodash");
 
 exports.UnaryExpression = function (node, print) {
   var hasSpace = /[a-z]$/.test(node.operator);
@@ -86,6 +87,7 @@ exports.ExpressionStatement = function (node, print) {
 
 exports.BinaryExpression =
 exports.LogicalExpression =
+exports.AssignmentPattern =
 exports.AssignmentExpression = function (node, print) {
   print(node.left);
   this.push(" " + node.operator + " ");
@@ -102,7 +104,12 @@ exports.MemberExpression = function (node, print) {
     throw new TypeError("Got a MemberExpression for MemberExpression property");
   }
 
-  if (node.computed) {
+  var computed = node.computed;
+  if (t.isLiteral(node.property) && _.isNumber(node.property.value)) {
+    computed = true;
+  }
+
+  if (computed) {
     this.push("[");
     print(node.property);
     this.push("]");

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

@@ -61,14 +61,40 @@ Node.prototype.needsParens = function () {
   if (!parent) return false;
 
   if (t.isNewExpression(parent) && parent.callee === node) {
-    return t.isCallExpression(node) || _.some(node, function (val) {
+    if (t.isCallExpression(node)) return true;
+
+    var hasCall = _.some(node, function (val) {
       return t.isCallExpression(val);
     });
+    if (hasCall) return true;
   }
 
   return find(parens, node, parent);
 };
 
+Node.prototype.needsParensNoLineTerminator = function () {
+  var parent = this.parent;
+  var node   = this.node;
+
+  if (!parent) return false;
+
+  // no comments
+  if (!node.leadingComments || !node.leadingComments.length) {
+    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;
+};
+
 _.each(Node.prototype, function (fn, key) {
   Node[key] = function (node, parent) {
     var n = new Node(node, parent);

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

@@ -13,15 +13,30 @@ _.each([
   ["<", ">", "<=", ">=", "in", "instanceof"],
   [">>", "<<", ">>>"],
   ["+", "-"],
-  ["*", "/", "%"]
+  ["*", "/", "%"],
+  ["**"]
 ], function (tier, i) {
   _.each(tier, function (op) {
     PRECEDENCE[op] = i;
   });
 });
 
+exports.ObjectExpression = function (node, parent) {
+  if (t.isExpressionStatement(parent)) {
+    // ({ foo: "bar" });
+    return true;
+  }
+
+  if (t.isMemberExpression(parent) && parent.object === node) {
+    // ({ foo: "bar" }).foo
+    return true;
+  }
+
+  return false;
+};
+
 exports.Binary = function (node, parent) {
-  if (t.isCallExpression(parent) && parent.callee === node) {
+  if ((t.isCallExpression(parent) || t.isNewExpression(parent)) && parent.callee === node) {
     return true;
   }
 

lib/6to5/index.js

@@ -3,6 +3,8 @@ var util      = require("./util");
 var fs        = require("fs");
 var _         = require("lodash");
 
+exports.version = require("../../package").version;
+
 exports.types = require("./types");
 
 exports.runtime = require("./runtime-generator");

lib/6to5/patch.js

@@ -12,6 +12,12 @@ var types = require("ast-types");
 var def   = types.Type.def;
 var or    = types.Type.or;
 
+def("AssignmentPattern")
+    .bases("Pattern")
+    .build("left", "right")
+    .field("left", def("Pattern"))
+    .field("right", def("Expression"));
+
 // Acorn - Same as ImportNamespaceSpecifier but `id` is `name`
 def("ImportBatchSpecifier")
   .bases("Specifier")

lib/6to5/register.js

@@ -123,7 +123,7 @@ var hookExtensions = function (_exts) {
   });
 };
 
-hookExtensions([".es6", ".js"]);
+hookExtensions([".es6", ".es", ".js"]);
 
 module.exports = function (opts) {
   // normalise options

lib/6to5/transformation/modules/_default.js

@@ -9,7 +9,11 @@ function DefaultFormatter(file) {
   this.file = file;
 
   this.localExports = this.getLocalExports();
+  this.localImports = this.getLocalImports();
+
   this.remapAssignments();
+
+  //this.checkCollisions();
 }
 
 DefaultFormatter.prototype.getLocalExports = function () {
@@ -27,6 +31,53 @@ DefaultFormatter.prototype.getLocalExports = function () {
   return localExports;
 };
 
+DefaultFormatter.prototype.getLocalImports = function () {
+  var localImports = {};
+
+  traverse(this.file.ast, {
+    enter: function (node) {
+      if (t.isImportDeclaration(node)) {
+        _.extend(localImports, t.getIds(node, true));
+      }
+    }
+  });
+
+  return localImports;
+};
+
+DefaultFormatter.prototype.checkCollisions = function () {
+  // todo: all check export collissions
+
+  var localImports = this.localImports;
+  var file = this.file;
+
+  var isLocalReference = function (node) {
+    return t.isIdentifier(node) && _.has(localImports, node.name) && localImports[node.name] !== node;
+  };
+
+  var check = function (node) {
+    if (isLocalReference(node)) {
+      throw file.errorWithNode(node, "Illegal assignment of module import");
+    }
+  };
+
+  traverse(file.ast, {
+    enter: function (node) {
+      if (t.isAssignmentExpression(node)) {
+
+        var left = node.left;
+        if (t.isMemberExpression(left)) {
+          while (left.object) left = left.object;
+        }
+
+        check(left);
+      } else if (t.isDeclaration(node)) {
+        _.each(t.getIds(node, true), check);
+      }
+    }
+  });
+};
+
 DefaultFormatter.prototype.remapExportAssignment = function (node) {
   return t.assignmentExpression(
     "=",
@@ -141,10 +192,18 @@ DefaultFormatter.prototype._exportSpecifier = function (getRef, specifier, node,
       // export * from "foo";
       nodes.push(this._exportsWildcard(getRef(), node));
     } else {
+      var ref;
+      if (t.isSpecifierDefault(specifier) && !this.noInteropRequire) {
+        // importing a default so we need to normalise it
+        ref = t.callExpression(this.file.addHelper("interop-require"), [getRef()]);
+      } else {
+        ref = t.memberExpression(getRef(), specifier.id);
+      }
+
       // export { foo } from "test";
       nodes.push(this._exportsAssign(
         t.getSpecifierName(specifier),
-        t.memberExpression(getRef(), specifier.id),
+        ref,
         node
       ));
     }
@@ -155,9 +214,9 @@ DefaultFormatter.prototype._exportSpecifier = function (getRef, specifier, node,
 };
 
 DefaultFormatter.prototype._exportsWildcard = function (objectIdentifier) {
-  return util.template("exports-wildcard", {
-    OBJECT: objectIdentifier
-  }, true);
+  return t.expressionStatement(t.callExpression(this.file.addHelper("exports-wildcard"), [
+    t.callExpression(this.file.addHelper("interop-require-wildcard"), [objectIdentifier])
+  ]));
 };
 
 DefaultFormatter.prototype._exportsAssign = function (id, init) {

lib/6to5/transformation/modules/amd.js

@@ -1,6 +1,7 @@
 module.exports = AMDFormatter;
 
 var DefaultFormatter = require("./_default");
+var CommonFormatter  = require("./common");
 var util             = require("../../util");
 var t                = require("../../types");
 var _                = require("lodash");
@@ -30,12 +31,15 @@ AMDFormatter.prototype.transform = function (ast) {
 
   // build an array of module names
 
-  var names = [t.literal("exports")].concat(this.buildDependencyLiterals());
+  var names = [t.literal("exports")];
+  if (this.passModuleArg) names.push(t.literal("module"));
+  names = names.concat(this.buildDependencyLiterals());
   names = t.arrayExpression(names);
 
   // build up define container
 
   var params = _.values(this.ids);
+  if (this.passModuleArg) params.unshift(t.identifier("module"));
   params.unshift(t.identifier("exports"));
 
   var container = t.functionExpression(null, params, t.blockStatement(body));
@@ -96,6 +100,14 @@ AMDFormatter.prototype.importSpecifier = function (specifier, node, nodes) {
   ]));
 };
 
+AMDFormatter.prototype.exportDeclaration = function (node) {
+  if (node.default) {
+    this.passModuleArg = true;
+  }
+
+  CommonFormatter.prototype.exportDeclaration.apply(this, arguments);
+};
+
 AMDFormatter.prototype.exportSpecifier = function (specifier, node, nodes) {
   var self = this;
   return this._exportSpecifier(function () {

lib/6to5/transformation/modules/common.js

@@ -32,18 +32,24 @@ CommonJSFormatter.prototype.importSpecifier = function (specifier, node, nodes)
       )
     ]));
   } else {
-    // import foo from "foo";
-
-    var templateName = "require-assign";
-
-    // import * as bar from "foo";
-    if (specifier.type !== "ImportBatchSpecifier") templateName += "-key";
-
-    nodes.push(util.template(templateName, {
-      VARIABLE_NAME: variableName,
-      MODULE_NAME:   node.source,
-      KEY:           specifier.id
-    }));
+    if (specifier.type === "ImportBatchSpecifier") {
+      // import * as bar from "foo";
+      nodes.push(t.variableDeclaration("var", [
+        t.variableDeclarator(
+          variableName,
+          t.callExpression(this.file.addHelper("interop-require-wildcard"), [
+            t.callExpression(t.identifier("require"), [node.source])
+          ])
+        )
+      ]));
+    } else {
+      // import foo from "foo";
+      nodes.push(util.template("require-assign-key", {
+        VARIABLE_NAME: variableName,
+        MODULE_NAME:   node.source,
+        KEY:           specifier.id
+      }));
+    }
   }
 };
 
@@ -55,7 +61,7 @@ CommonJSFormatter.prototype.importDeclaration = function (node, nodes) {
 };
 
 CommonJSFormatter.prototype.exportDeclaration = function (node, nodes) {
-  if (node.default) {
+  if (node.default && !this.exportIdentifier) {
     var declar = node.declaration;
     var assign;
 
@@ -65,7 +71,7 @@ CommonJSFormatter.prototype.exportDeclaration = function (node, nodes) {
     // exports = module.exports = VALUE;
     if (this.hasNonDefaultExports) templateName = "exports-default-module-override";
 
-    if (t.isFunction(declar) || !this.hasNonDefaultExports) {
+    if (t.isFunctionDeclaration(declar) || !this.hasNonDefaultExports) {
       assign = util.template(templateName, {
         VALUE: this._pushStatement(declar, nodes)
       }, true);

lib/6to5/transformation/modules/system.js

@@ -1,6 +1,7 @@
 module.exports = SystemFormatter;
 
 var AMDFormatter = require("./amd");
+var useStrict    = require("../transformers/use-strict");
 var traverse     = require("../../traverse");
 var util         = require("../../util");
 var t            = require("../../types");
@@ -31,7 +32,7 @@ SystemFormatter.prototype._exportsWildcard = function (objectIdentifier, node) {
   var right = objectIdentifier;
 
   var block = t.blockStatement([
-    this.buildExportCall(leftIdentifier, valIdentifier)
+    t.expressionStatement(this.buildExportCall(leftIdentifier, valIdentifier))
   ]);
 
   return this._addImportSource(t.forInStatement(left, right, block), node);
@@ -170,5 +171,9 @@ SystemFormatter.prototype.transform = function (ast) {
 
   handlerBody.push(returnStatement);
 
+  if (useStrict._has(block)) {
+    handlerBody.unshift(block.body.shift());
+  }
+
   program.body = [runner];
 };

lib/6to5/transformation/modules/umd.js

@@ -25,22 +25,37 @@ UMDFormatter.prototype.transform = function (ast) {
   // factory
 
   var ids  = _.values(this.ids);
-  var args = [t.identifier("exports")].concat(ids);
+  var args = [t.identifier("exports")];
+  if (this.passModuleArg) args.push(t.identifier("module"));
+  args = args.concat(ids);
 
   var factory = t.functionExpression(null, args, t.blockStatement(body));
 
   // runner
 
-  var defineArgs = [t.arrayExpression([t.literal("exports")].concat(names))];
+  var defineArgs = [t.literal("exports")];
+  if (this.passModuleArg) defineArgs.push(t.literal("module"));
+  defineArgs = defineArgs.concat(names);
+  defineArgs = [t.arrayExpression(defineArgs)];
+
+  // typeof exports !== "undefined" && typeof module !== "undefined"
+  var testExports = t.binaryExpression("!==", t.unaryExpression("typeof", t.identifier("exports"), true), t.literal("undefined")),
+      testModule = t.binaryExpression("!==", t.unaryExpression("typeof", t.identifier("module"), true), t.literal("undefined")),
+      commonTests = this.passModuleArg ? t.logicalExpression("&&", testExports, testModule) : testExports;
+
+  var commonArgs = [t.identifier("exports")];
+  if (this.passModuleArg) commonArgs.push(t.identifier("module"));
+  commonArgs = commonArgs.concat(names.map(function (name) {
+    return t.callExpression(t.identifier("require"), [name]);
+  }));
+
   var moduleName = this.getModuleName();
   if (moduleName) defineArgs.unshift(t.literal(moduleName));
 
   var runner = util.template("umd-runner-body", {
     AMD_ARGUMENTS: defineArgs,
-
-    COMMON_ARGUMENTS: names.map(function (name) {
-      return t.callExpression(t.identifier("require"), [name]);
-    })
+    COMMON_TEST: commonTests,
+    COMMON_ARGUMENTS: commonArgs
   });
 
   //

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

@@ -0,0 +1 @@
+Function.prototype.bind

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

@@ -1,3 +1,3 @@
-if (SUPER_NAME) {
+if (SUPER_NAME !== null) {
   SUPER_NAME.apply(this, arguments);
 }

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

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

lib/6to5/transformation/templates/exports-wildcard.js

@@ -1,5 +1,7 @@
 (function (obj) {
   for (var i in obj) {
-    exports[i] = obj[i];
+    if (exports[i] !== undefined) {
+      exports[i] = obj[i];
+    }
   }
-})(OBJECT);
+})

lib/6to5/transformation/templates/if-undefined-set-to.js

@@ -1 +0,0 @@
-if (VARIABLE === undefined) VARIABLE = DEFAULT;

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

@@ -1,4 +1,7 @@
 (function (child, parent) {
+  if (typeof parent !== "function" && parent !== null) {
+    throw new TypeError("Super expression must either be null or a function, not " + typeof parent);
+  }
   child.prototype = Object.create(parent && parent.prototype, {
     constructor: {
       value: child,

lib/6to5/transformation/templates/interop-require-wildcard.js

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

lib/6to5/transformation/templates/object-define-properties-closure.js

@@ -0,0 +1,5 @@
+
+(function (KEY) {
+  CONTENT;
+  return KEY;
+})(OBJECT);

lib/6to5/transformation/templates/require-assign.js

@@ -1 +0,0 @@
-var VARIABLE_NAME = require(MODULE_NAME);

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

@@ -0,0 +1,3 @@
+for (var KEY = START; KEY < ARGUMENTS.length; KEY++) {
+  ARRAY[ARRAY_KEY] = ARGUMENTS[KEY];
+}

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

@@ -0,0 +1,3 @@
+(function (obj) {
+  return obj && obj.constructor === Symbol ? "symbol" : typeof obj;
+});

lib/6to5/transformation/templates/umd-runner-body.js

@@ -1,7 +1,7 @@
 (function (factory) {
   if (typeof define === "function" && define.amd) {
     define(AMD_ARGUMENTS, factory);
-  } else if (typeof exports !== "undefined") {
-    factory(exports, COMMON_ARGUMENTS);
+  } else if (COMMON_TEST) {
+    factory(COMMON_ARGUMENTS);
   }
 });

lib/6to5/transformation/transform.js

@@ -39,10 +39,7 @@ transform.moduleFormatters = {
 };
 
 _.each({
-  // spec
-  specBlockHoistFunctions:   require("./transformers/spec-block-hoist-functions"),
   specNoForInOfAssignment:   require("./transformers/spec-no-for-in-of-assignment"),
-  specNoDuplicateProperties: require("./transformers/spec-no-duplicate-properties"),
 
   // playground
   methodBinding:             require("./transformers/playground-method-binding"),
@@ -86,10 +83,11 @@ _.each({
   _declarations:             require("./transformers/_declarations"),
 
   // wrap up
+  useStrict:                 require("./transformers/use-strict"),
   _aliasFunctions:           require("./transformers/_alias-functions"),
   _moduleFormatter:          require("./transformers/_module-formatter"),
-  useStrict:                 require("./transformers/use-strict"),
 
+  typeofSymbol:              require("./transformers/optional-typeof-symbol"),
   coreAliasing:              require("./transformers/optional-core-aliasing"),
   undefinedToVoid:           require("./transformers/optional-undefined-to-void"),
 

lib/6to5/transformation/transformer.js

@@ -8,20 +8,25 @@ function Transformer(key, transformer, opts) {
   this.manipulateOptions = transformer.manipulateOptions;
   this.experimental      = !!transformer.experimental;
   this.secondPass        = !!transformer.secondPass;
-  this.transformer       = Transformer.normalise(transformer);
+  this.transformer       = this.normalise(transformer);
   this.optional          = !!transformer.optional;
   this.opts              = opts || {};
   this.key               = key;
 }
 
-Transformer.normalise = function (transformer) {
+Transformer.prototype.normalise = function (transformer) {
+  var self = this;
+
   if (_.isFunction(transformer)) {
     transformer = { ast: transformer };
   }
 
   _.each(transformer, function (fns, type) {
     // hidden property
-    if (type[0] === "_") return;
+    if (type[0] === "_") {
+      self[type] = fns;
+      return;
+    }
 
     if (_.isFunction(fns)) fns = { enter: fns };
 

lib/6to5/transformation/transformers/_alias-functions.js

@@ -67,7 +67,7 @@ var go = function (getBody, node, file, scope) {
   }
 
   if (thisId) {
-    pushDeclaration(thisId, t.identifier("this"));
+    pushDeclaration(thisId, t.thisExpression());
   }
 };
 

lib/6to5/transformation/transformers/_block-hoist.js

@@ -1,4 +1,5 @@
-var _ = require("lodash");
+var useStrict = require("./use-strict");
+var _         = require("lodash");
 
 // Priority:
 //
@@ -17,13 +18,15 @@ exports.Program = {
     }
     if (!hasChange) return;
 
-    var nodePriorities = _.groupBy(node.body, function (bodyNode) {
-      var priority = bodyNode._blockHoist;
-      if (priority == null) priority = 1;
-      if (priority === true) priority = 2;
-      return priority;
-    });
+    useStrict._wrap(node, function () {
+      var nodePriorities = _.groupBy(node.body, function (bodyNode) {
+        var priority = bodyNode._blockHoist;
+        if (priority == null) priority = 1;
+        if (priority === true) priority = 2;
+        return priority;
+      });
 
-    node.body = _.flatten(_.values(nodePriorities).reverse());
+      node.body = _.flatten(_.values(nodePriorities).reverse());
+    });
   }
 };

lib/6to5/transformation/transformers/_declarations.js

@@ -1,4 +1,5 @@
-var t = require("../../types");
+var useStrict = require("./use-strict");
+var t         = require("../../types");
 
 exports.secondPass = true;
 
@@ -7,23 +8,25 @@ exports.Program = function (node) {
   var kinds = {};
   var kind;
 
-  for (var i in node._declarations) {
-    var declar = node._declarations[i];
+  useStrict._wrap(node, function () {
+    for (var i in node._declarations) {
+      var declar = node._declarations[i];
 
-    kind = declar.kind || "var";
-    var declarNode = t.variableDeclarator(declar.id, declar.init);
+      kind = declar.kind || "var";
+      var declarNode = t.variableDeclarator(declar.id, declar.init);
 
-    if (!declar.init) {
-      kinds[kind] = kinds[kind] || [];
-      kinds[kind].push(declarNode);
-    } else {
-      node.body.unshift(t.variableDeclaration(kind, [declarNode]));
+      if (!declar.init) {
+        kinds[kind] = kinds[kind] || [];
+        kinds[kind].push(declarNode);
+      } else {
+        node.body.unshift(t.variableDeclaration(kind, [declarNode]));
+      }
     }
-  }
 
-  for (kind in kinds) {
-    node.body.unshift(t.variableDeclaration(kind, kinds[kind]));
-  }
+    for (kind in kinds) {
+      node.body.unshift(t.variableDeclaration(kind, kinds[kind]));
+    }
+  });
 
   node._declarations = null;
 };

lib/6to5/transformation/transformers/es6-default-parameters.js

@@ -49,16 +49,29 @@ exports.Function = function (node, parent, file, scope) {
 
   var body = [];
 
+  var argsIdentifier = t.identifier("arguments");
+  argsIdentifier._ignoreAliasFunctions = true;
+
+  var lastNonDefaultParam = 0;
+
   for (i in node.defaults) {
     def = node.defaults[i];
-    if (!def) continue;
+    if (!def) {
+      lastNonDefaultParam = +i + 1;
+      continue;
+    }
 
-    body.push(util.template("if-undefined-set-to", {
-      VARIABLE: node.params[i],
-      DEFAULT:  def
+    body.push(util.template("default-parameter", {
+      VARIABLE_NAME: node.params[i],
+      DEFAULT_VALUE: def,
+      ARGUMENT_KEY:  t.literal(+i),
+      ARGUMENTS:     argsIdentifier
     }, true));
   }
 
+  // we need to cut off all trailing default parameters
+  node.params = node.params.slice(0, lastNonDefaultParam);
+
   if (iife) {
     var container = t.functionExpression(null, [], node.body, node.generator);
     container._aliasFunction = true;

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

@@ -20,11 +20,31 @@ var push = function (opts, nodes, elem, parentId) {
     pushObjectPattern(opts, nodes, elem, parentId);
   } else if (t.isArrayPattern(elem)) {
     pushArrayPattern(opts, nodes, elem, parentId);
+  } else if (t.isAssignmentPattern(elem)) {
+    pushAssignmentPattern(opts, nodes, elem, parentId);
   } else {
     nodes.push(buildVariableAssign(opts, elem, parentId));
   }
 };
 
+var pushAssignmentPattern = function (opts, nodes, pattern, parentId) {
+  var tempParentId = opts.scope.generateUidBasedOnNode(parentId, opts.file);
+
+  nodes.push(t.variableDeclaration("var", [
+    t.variableDeclarator(tempParentId, parentId)
+  ]));
+
+  nodes.push(buildVariableAssign(
+    opts,
+    pattern.left,
+    t.conditionalExpression(
+      t.binaryExpression("===", tempParentId, t.identifier("undefined")),
+      pattern.right,
+      tempParentId
+    )
+  ));
+};
+
 var pushObjectPattern = function (opts, nodes, pattern, parentId) {
   for (var i in pattern.properties) {
     var prop = pattern.properties[i];
@@ -48,6 +68,8 @@ var pushObjectPattern = function (opts, nodes, pattern, parentId) {
         var value = t.callExpression(opts.file.addHelper("object-without-properties"), [parentId, keys]);
         nodes.push(buildVariableAssign(opts, prop.argument, value));
     } else {
+      if (t.isLiteral(prop.key)) prop.computed = true;
+
       var pattern2   = prop.value;
       var patternId2 = t.memberExpression(parentId, prop.key, prop.computed);
 
@@ -183,6 +205,24 @@ exports.Function = function (node, parent, file, scope) {
   block.body = nodes.concat(block.body);
 };
 
+exports.CatchClause = function (node, parent, file, scope) {
+  var pattern = node.param;
+  if (!t.isPattern(pattern)) return;
+
+  var ref = file.generateUidIdentifier("ref", scope);
+  node.param = ref;
+
+  var nodes = [];
+
+  push({
+    kind: "var",
+    file: file,
+    scope: scope
+  }, nodes, pattern, ref);
+
+  node.body.body = nodes.concat(node.body.body);
+};
+
 exports.ExpressionStatement = function (node, parent, file, scope) {
   var expr = node.expression;
   if (expr.type !== "AssignmentExpression") return;

lib/6to5/transformation/transformers/es6-let-scoping.js

@@ -376,7 +376,7 @@ LetScoping.prototype.getLetReferences = function () {
 
             // this scope has a variable with the same name so it couldn't belong
             // to our let scope
-            if (scope.hasOwn(node.name)) return;
+            if (scope.hasOwn(node.name, true)) return;
 
             closurify = true;
 
@@ -388,8 +388,6 @@ LetScoping.prototype.getLetReferences = function () {
           }
         });
 
-        return this.skip();
-      } else if (t.isLoop(node)) {
         return this.skip();
       }
     }

lib/6to5/transformation/transformers/es6-rest-parameters.js

@@ -1,4 +1,5 @@
-var t = require("../../types");
+var util = require("../../util");
+var t    = require("../../types");
 
 exports.Function = function (node, parent, file) {
   if (!node.rest) return;
@@ -8,15 +9,28 @@ exports.Function = function (node, parent, file) {
 
   t.ensureBlock(node);
 
-  var call = file.toArray(t.identifier("arguments"));
+  var argsId = t.identifier("arguments");
+  argsId._ignoreAliasFunctions = true;
 
+  var start = t.literal(node.params.length);
+  var key = file.generateUidIdentifier("key");
+
+  var arrKey = key;
   if (node.params.length) {
-    call.arguments.push(t.literal(node.params.length));
+    arrKey = t.binaryExpression("-", arrKey, start);
   }
 
-  call._ignoreAliasFunctions = true;
+  node.body.body.unshift(
+    t.variableDeclaration("var", [
+      t.variableDeclarator(rest, t.arrayExpression([]))
+    ]),
 
-  node.body.body.unshift(t.variableDeclaration("var", [
-    t.variableDeclarator(rest, call)
-  ]));
+    util.template("rest", {
+      ARGUMENTS: argsId,
+      ARRAY_KEY: arrKey,
+      START: start,
+      ARRAY: rest,
+      KEY: key
+    })
+  );
 };

lib/6to5/transformation/transformers/es6-spread.js

@@ -1,4 +1,5 @@
 var t = require("../../types");
+var _ = require("lodash");
 
 var getSpreadLiteral = function (spread, file) {
   return file.toArray(spread.argument);
@@ -58,7 +59,7 @@ exports.CallExpression = function (node, parent, file, scope) {
   var args = node.arguments;
   if (!hasSpread(args)) return;
 
-  var contextLiteral = t.literal(null);
+  var contextLiteral = t.identifier("undefined");
 
   node.arguments = [];
 
@@ -83,6 +84,8 @@ exports.CallExpression = function (node, parent, file, scope) {
     if (temp) {
       callee.object = t.assignmentExpression("=", temp, callee.object);
       contextLiteral = temp;
+    } else {
+      contextLiteral = callee.object;
     }
     t.appendToMemberExpression(callee, t.identifier("apply"));
   } else {
@@ -96,7 +99,14 @@ exports.NewExpression = function (node, parent, file) {
   var args = node.arguments;
   if (!hasSpread(args)) return;
 
+  var nativeType = t.isIdentifier(node.callee) && _.contains(t.NATIVE_TYPE_NAMES, node.callee.name);
+
   var nodes = build(args, file);
+
+  if (nativeType) {
+    nodes.unshift(t.arrayExpression([t.literal(null)]));
+  }
+
   var first = nodes.shift();
 
   if (nodes.length) {
@@ -105,5 +115,15 @@ exports.NewExpression = function (node, parent, file) {
     args = first;
   }
 
-  return t.callExpression(file.addHelper("apply-constructor"), [node.callee, args]);
+  if (nativeType) {
+    return t.newExpression(
+      t.callExpression(
+        t.memberExpression(file.addHelper("bind"), t.identifier("apply")),
+        [node.callee, args]
+      ),
+      []
+    );
+  } else {
+    return t.callExpression(file.addHelper("apply-constructor"), [node.callee, args]);
+  }
 };

lib/6to5/transformation/transformers/optional-bluebird-coroutines.js

@@ -38,8 +38,6 @@ exports._Function = function (node, callId) {
 exports.Function = function (node, parent, file) {
   if (!node.async || node.generator) return;
 
-  var id = t.identifier("Bluebird");
-  file.addImport(id, "bluebird");
-
+  var id = file.addImport("bluebird");
   return exports._Function(node, t.memberExpression(id, t.identifier("coroutine")));
 };

lib/6to5/transformation/transformers/optional-core-aliasing.js

@@ -12,8 +12,7 @@ exports.optional = true;
 
 exports.ast = {
   enter: function (ast, file) {
-    file._coreId = file.generateUidIdentifier("core");
-    file.addImport(file._coreId, "core-js/library");
+    file._coreId = file.addImport("core-js/library", "core");
   },
 
   exit: function (ast, file) {

lib/6to5/transformation/transformers/optional-typeof-symbol.js

@@ -0,0 +1,9 @@
+var t = require("../../types");
+
+exports.optional = true;
+
+exports.UnaryExpression = function (node, parent, file) {
+  if (node.operator === "typeof") {
+    return t.callExpression(file.addHelper("typeof"), [node.argument]);
+  }
+};

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

@@ -36,8 +36,13 @@ exports.XJSAttribute = {
   }
 };
 
+var isTag = function(tagName) {
+  return (/^[a-z]|\-/).test(tagName);
+};
+
 exports.XJSOpeningElement = {
-  exit: function (node) {
+  exit: function (node, parent, file) {
+    var reactCompat = file.opts.reactCompat;
     var tagExpr = node.name;
     var args = [];
 
@@ -48,10 +53,12 @@ exports.XJSOpeningElement = {
       tagName = tagExpr.value;
     }
 
-    if (tagName && (/[a-z]/.exec(tagName[0]) || tagName.indexOf("-") >= 0)) {
-      args.push(t.literal(tagName));
-    } else {
-      args.push(tagExpr);
+    if (!reactCompat) {
+      if (tagName && isTag(tagName)) {
+        args.push(t.literal(tagName));
+      } else {
+        args.push(tagExpr);
+      }
     }
 
     var props = node.attributes;
@@ -96,8 +103,30 @@ exports.XJSOpeningElement = {
 
     args.push(props);
 
-    tagExpr = t.memberExpression(t.identifier("React"), t.identifier("createElement"));
-    return t.callExpression(tagExpr, args);
+    if (reactCompat) {
+      if (tagName && isTag(tagName)) {
+        return t.callExpression(
+          t.memberExpression(
+            t.memberExpression(
+              t.identifier('React'),
+              t.identifier('DOM'),
+              false
+            ),
+            tagExpr,
+            t.isLiteral(tagExpr)
+          ),
+          args
+        );
+      } else {
+        return t.callExpression(
+          tagExpr,
+          args
+        );
+      }
+    } else {
+      tagExpr = t.memberExpression(t.identifier("React"), t.identifier("createElement"));
+      return t.callExpression(tagExpr, args);
+    }
   }
 };
 

lib/6to5/transformation/transformers/spec-block-hoist-functions.js

@@ -1,18 +0,0 @@
-var t = require("../../types");
-
-exports.BlockStatement = function (node, parent) {
-  if (t.isFunction(parent)) return;
-
-  node.body = node.body.map(function (node) {
-    if (t.isFunction(node)) {
-      node.type = "FunctionExpression";
-      var declar = t.variableDeclaration("let", [
-        t.variableDeclarator(node.id, node)
-      ]);
-      declar._blockHoist = true;
-      return declar;
-    } else {
-      return node;
-    }
-  });
-};

lib/6to5/transformation/transformers/spec-member-expression-literals.js

@@ -1,5 +1,4 @@
-var esutils = require("esutils");
-var t       = require("../../types");
+var t = require("../../types");
 
 exports.MemberExpression = function (node) {
   var prop = node.property;
@@ -7,7 +6,7 @@ exports.MemberExpression = function (node) {
     // computed literal that is a valid identifier
     node.property = t.identifier(prop.value);
     node.computed = false;
-  } else if (!node.computed && t.isIdentifier(prop) && esutils.keyword.isKeywordES6(prop.name, true)) {
+  } else if (!node.computed && t.isIdentifier(prop) && !t.isValidIdentifier(prop.name)) {
     node.property = t.literal(prop.name);
     node.computed = true;
   }

lib/6to5/transformation/transformers/spec-no-duplicate-properties.js

@@ -1,25 +0,0 @@
-var t = require("../../types");
-
-exports.ObjectExpression = function (node, parent, file) {
-  var keys = [];
-
-  for (var i in node.properties) {
-    var prop = node.properties[i];
-    if (prop.computed || prop.kind !== "init") continue;
-
-    var key = prop.key;
-    if (t.isIdentifier(key)) {
-      key = key.name;
-    } else if (t.isLiteral(key)) {
-      key = key.value;
-    } else {
-      continue;
-    }
-
-    if (keys.indexOf(key) >= 0) {
-      throw file.errorWithNode(prop.key, "Duplicate property key");
-    } else {
-      keys.push(key);
-    }
-  }
-};

lib/6to5/transformation/transformers/spec-property-literals.js

@@ -1,5 +1,4 @@
-var esutils = require("esutils");
-var t       = require("../../types");
+var t = require("../../types");
 
 exports.Property = function (node) {
   var key = node.key;
@@ -7,7 +6,7 @@ exports.Property = function (node) {
     // property key is a literal but a valid identifier
     node.key = t.identifier(key.value);
     node.computed = false;
-  } else if (!node.computed && t.isIdentifier(key) && esutils.keyword.isKeywordES6(key.name, true)) {
+  } else if (!node.computed && t.isIdentifier(key) && !t.isValidIdentifier(key.name)) {
     // property key is a keyword
     node.key = t.literal(key.name);
   }

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

@@ -1,14 +1,27 @@
 var t = require("../../types");
 
+exports._has = function (node) {
+  var first = node.body[0];
+  return t.isExpressionStatement(first) && t.isLiteral(first.expression, { value: "use strict" });
+};
+
+exports._wrap = function (node, callback) {
+  var useStrictNode;
+  if (exports._has(node)) {
+    useStrictNode = node.body.shift();
+  }
+
+  callback();
+
+  if (useStrictNode) {
+    node.body.unshift(useStrictNode);
+  }
+};
+
 exports.ast = {
   exit: function (ast) {
-    var body = ast.program.body;
-    var first = body[0];
-
-    var noStrict = !first || !t.isExpressionStatement(first) || !t.isLiteral(first.expression) || first.expression.value !== "use strict";
-
-    if (noStrict) {
-      body.unshift(t.expressionStatement(t.literal("use strict")));
+    if (!exports._has(ast.program)) {
+      ast.program.body.unshift(t.expressionStatement(t.literal("use strict")));
     }
   }
 };

lib/6to5/traverse/scope.js

@@ -63,38 +63,29 @@ Scope.prototype.generateUidBasedOnNode = function (parent, file) {
     node = parent.left;
   } else if (t.isVariableDeclarator(parent)) {
     node = parent.id;
-  }
-
-  var id = "ref";
-
-  if (t.isProperty(node)) {
+  } else if (t.isProperty(node)) {
     node = node.key;
   }
 
-  if (t.isIdentifier(node)) {
-    id = node.name;
-  } else if (t.isLiteral(node)) {
-    id = node.value;
-  } else if (t.isMemberExpression(node)) {
-    var parts = [];
+  var parts = [];
 
-    var add = function (node) {
-      if (t.isMemberExpression(node)) {
-        add(node.object);
-        add(node.property);
-      } else if (t.isIdentifier(node)) {
-        parts.push(node.name);
-      } else if (t.isLiteral(node)) {
-        parts.push(node.value);
-      }
-    };
+  var add = function (node) {
+    if (t.isMemberExpression(node)) {
+      add(node.object);
+      add(node.property);
+    } else if (t.isIdentifier(node)) {
+      parts.push(node.name);
+    } else if (t.isLiteral(node)) {
+      parts.push(node.value);
+    } else if (t.isCallExpression(node)) {
+      add(node.callee);
+    }
+  };
 
-    add(node);
+  add(node);
 
-    id = parts.join("$");
-  }
-
-  id = id.replace(/^_/, "");
+  var id = parts.join("$");
+  id = id.replace(/^_/, "") || "ref";
 
   return file.generateUidIdentifier(id, this);
 };
@@ -108,10 +99,6 @@ Scope.prototype.generateUidBasedOnNode = function (parent, file) {
  */
 
 Scope.prototype.generateTempBasedOnNode = function (node, file) {
-  if (!t.isIdentifier(node) && !t.isMemberExpression(node)) {
-    throw new TypeError("Invalid node type " + JSON.stringify(node.type) + " passed to Scope.prototype.generateTempBasedOnNode");
-  }
-
   if (t.isIdentifier(node) && this.has(node.name, true)) {
     return null;
   }

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

@@ -39,8 +39,9 @@
   "ForInStatement": ["Statement", "For", "Scope", "Loop"],
   "ForStatement":   ["Statement", "For", "Scope", "Loop"],
 
-  "ObjectPattern": ["Pattern"],
-  "ArrayPattern":  ["Pattern"],
+  "ObjectPattern":     ["Pattern"],
+  "ArrayPattern":      ["Pattern"],
+  "AssignmentPattern": ["Pattern"],
 
   "Property": ["UserWhitespacable"],
   "XJSElement": ["UserWhitespacable", "Expression"],

lib/6to5/types/index.js

@@ -3,6 +3,10 @@ var _       = require("lodash");
 
 var t = exports;
 
+t.NATIVE_TYPE_NAMES = ["Array", "Object", "Number", "Boolean", "Date", "Array", "String"];
+
+//
+
 var addAssert = function (type, is) {
   t["assert" + type] = function (node, opts) {
     opts = opts || {};
@@ -214,7 +218,7 @@ t.isReferenced = function (node, parent) {
  */
 
 t.isValidIdentifier = function (name) {
-  return _.isString(name) && esutils.keyword.isIdentifierName(name) && !esutils.keyword.isKeywordES6(name, true);
+  return _.isString(name) && esutils.keyword.isIdentifierName(name) && !esutils.keyword.isReservedWordES6(name, true);
 };
 
 /*
@@ -227,6 +231,8 @@ t.isValidIdentifier = function (name) {
 t.toIdentifier = function (name) {
   if (t.isIdentifier(name)) return name.name;
 
+  name = name + "";
+
   // replace all non-valid identifiers with dashes
   name = name.replace(/[^a-zA-Z0-9$_]/g, "-");
 
@@ -241,6 +247,10 @@ t.toIdentifier = function (name) {
   // remove underscores from start of name
   name = name.replace(/^\_/, "");
 
+  if (!t.isValidIdentifier(name)) {
+    name = "_" + name;
+  }
+
   return name || '_';
 };
 
@@ -345,16 +355,24 @@ t.getIds = function (node, map, ignoreTypes) {
     if (!id) continue;
     if (_.contains(ignoreTypes, id.type)) continue;
 
-    var nodeKey = t.getIds.nodes[id.type];
+    var nodeKeys = t.getIds.nodes[id.type];
     var arrKeys  = t.getIds.arrays[id.type];
 
+    var i, key;
+
     if (t.isIdentifier(id)) {
       ids[id.name] = id;
-    } else if (nodeKey) {
-      if (id[nodeKey]) search.push(id[nodeKey]);
+    } else if (nodeKeys) {
+      for (i in nodeKeys) {
+        key = nodeKeys[i];
+        if (id[key]) {
+          search.push(id[key]);
+          break;
+        }
+      }
     } else if (arrKeys) {
-      for (var i in arrKeys) {
-        var key = arrKeys[i];
+      for (i in arrKeys) {
+        key = arrKeys[i];
         search = search.concat(id[key] || []);
       }
     }
@@ -365,15 +383,16 @@ t.getIds = function (node, map, ignoreTypes) {
 };
 
 t.getIds.nodes = {
-  AssignmentExpression: "left",
-  ImportSpecifier: "name",
-  ExportSpecifier: "name",
-  VariableDeclarator: "id",
-  FunctionDeclaration: "id",
-  ClassDeclaration: "id",
-  MemeberExpression: "object",
-  SpreadElement: "argument",
-  Property: "value"
+  AssignmentExpression: ["left"],
+  ImportBatchSpecifier: ["name"],
+  ImportSpecifier: ["name", "id"],
+  ExportSpecifier: ["name", "id"],
+  VariableDeclarator: ["id"],
+  FunctionDeclaration: ["id"],
+  ClassDeclaration: ["id"],
+  MemeberExpression: ["object"],
+  SpreadElement: ["argument"],
+  Property: ["value"]
 };
 
 t.getIds.arrays = {

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

@@ -3,6 +3,7 @@
   "ArrayPattern":              ["elements"],
   "ArrowFunctionExpression":   ["params", "defaults", "rest", "body"],
   "AssignmentExpression":      ["left", "right"],
+  "AssignmentPattern":         ["left", "right"],
   "AwaitExpression":           ["argument"],
   "BinaryExpression":          ["left", "right"],
   "BindFunctionExpression":    ["callee", "arguments"],

lib/6to5/util.js

@@ -12,7 +12,7 @@ var _          = require("lodash");
 exports.inherits = util.inherits;
 
 exports.canCompile = function (filename, altExts) {
-  var exts = altExts || [".js", ".jsx", ".es6"];
+  var exts = altExts || [".js", ".jsx", ".es6", ".es"];
   var ext = path.extname(filename);
   return _.contains(exts, ext);
 };
@@ -146,10 +146,10 @@ exports.template = function (name, nodes, keepExpression) {
   var node = template.body[0];
 
   if (!keepExpression && t.isExpressionStatement(node)) {
-    node = node.expression;
+    return node.expression;
+  } else {
+    return node;
   }
-
-  return node;
 };
 
 exports.codeFrame = function (lines, lineNumber, colNumber) {

package.json

@@ -1,7 +1,7 @@
 {
   "name": "6to5",
   "description": "Turn ES6 code into readable vanilla ES5 with source maps",
-  "version": "2.4.10",
+  "version": "2.7.2",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://github.com/6to5/6to5",
   "repository": {
@@ -39,19 +39,20 @@
     "test": "make test"
   },
   "dependencies": {
-    "acorn-6to5": "0.11.1-8",
+    "acorn-6to5": "0.11.1-11",
     "ast-types": "~0.6.1",
     "chokidar": "0.11.1",
     "commander": "2.5.0",
-    "core-js": "^0.3.3",
+    "core-js": "^0.4.1",
     "estraverse": "1.8.0",
     "esutils": "1.1.6",
+    "esvalid": "^1.1.0",
     "fs-readdir-recursive": "0.1.0",
     "jshint": "^2.5.10",
     "lodash": "2.4.1",
     "mkdirp": "0.5.0",
     "private": "0.1.6",
-    "regenerator": "^0.8.2",
+    "regenerator": "^0.8.3",
     "regexpu": "0.3.0",
     "roadrunner": "^1.0.4",
     "source-map": "0.1.40",

test/_helper.js

@@ -1,8 +1,9 @@
-var fs = require("fs");
-var _  = require("lodash");
+var path = require("path");
+var fs   = require("fs");
+var _    = require("lodash");
 
 var humanise = function (val) {
-  return val.replace(/-/g, " ");
+  return path.basename(val, path.extname(val)).replace(/-/g, " ");
 };
 
 var readFile = exports.readFile = function (filename) {
@@ -15,11 +16,11 @@ var readFile = exports.readFile = function (filename) {
   }
 };
 
-exports.get = function (entryName) {
+exports.get = function (entryName, entryLoc) {
   if (exports.cache[entryName]) return exports.cache[entryName];
 
   var suites = [];
-  var entryLoc = __dirname + "/fixtures/" + entryName;
+  var entryLoc = entryLoc || __dirname + "/fixtures/" + entryName;
 
   _.each(fs.readdirSync(entryLoc), function (suiteName) {
     if (suiteName[0] === ".") return;
@@ -35,9 +36,18 @@ exports.get = function (entryName) {
     var suiteOptsLoc = suite.filename + "/options.json";
     if (fs.existsSync(suiteOptsLoc)) suite.options = require(suiteOptsLoc);
 
-    _.each(fs.readdirSync(suite.filename), function (taskName) {
-      var taskDir = suite.filename + "/" + taskName;
-      if (fs.statSync(taskDir).isFile()) return;
+    if (fs.statSync(suite.filename).isFile()) {
+      push(suiteName, suite.filename);
+    } else {
+      _.each(fs.readdirSync(suite.filename), function (taskName) {
+        var taskDir = suite.filename + "/" + taskName;
+        push(taskName, taskDir);
+      });
+    }
+
+    function push(taskName, taskDir) {
+      // tracuer error tests
+      if (taskName.indexOf("Error_") >= 0) return;
 
       var actualLocAlias = suiteName + "/" + taskName + "/actual.js";
       var expectLocAlias = suiteName + "/" + taskName + "/expected.js";
@@ -47,6 +57,13 @@ exports.get = function (entryName) {
       var expectLoc = taskDir + "/expected.js";
       var execLoc   = taskDir + "/exec.js";
 
+      if (fs.statSync(taskDir).isFile()) {
+        var ext = path.extname(taskDir);
+        if (ext !== ".js" && ext !== ".module.js") return;
+
+        execLoc = taskDir;
+      }
+
       var taskOpts = _.merge({
         filenameRelative: expectLocAlias,
         sourceFileName:   actualLocAlias,
@@ -77,6 +94,18 @@ exports.get = function (entryName) {
         }
       };
 
+      // traceur checks
+
+      var shouldSkip = function (code) {
+        return code.indexOf("// Error:") >= 0 || code.indexOf("// Skip.") >= 0;
+      };
+
+      if (shouldSkip(test.actual.code) || shouldSkip(test.exec.code)) {
+        return;
+      } else if (test.exec.code.indexOf("// Async.") >= 0) {
+        //test.options.asyncExec = true;
+      }
+
       suite.tests.push(test);
 
       var sourceMappingsLoc = taskDir + "/source-mappings.json";
@@ -90,7 +119,7 @@ exports.get = function (entryName) {
         test.options.sourceMap = true;
         test.sourceMap = require(sourceMap);
       }
-    });
+    }
   });
 
   return exports.cache[entryName] = suites;
@@ -104,4 +133,5 @@ try {
   var cache = exports.cache = {};
   cache.transformation = exports.get("transformation");
   cache.generation     = exports.get("generation");
+  cache.esnext         = exports.get("esnext");
 }

test/_transformation-helper.js

@@ -0,0 +1,168 @@
+var genHelpers = require("./_generator-helpers");
+var transform  = require("../lib/6to5/transformation/transform");
+var sourceMap  = require("source-map");
+var esvalid    = require("esvalid");
+var Module     = require("module");
+var helper     = require("./_helper");
+var assert     = require("assert");
+var chai       = require("chai");
+var path       = require("path");
+var util       = require("../lib/6to5/util");
+var _          = require("lodash");
+
+require("../lib/6to5/polyfill");
+
+global.assertNoOwnProperties = function (obj) {
+  assert.equal(Object.getOwnPropertyNames(obj).length, 0);
+};
+
+global.assertArrayEquals = assert.deepEqual;
+global.assert = chai.assert;
+global.chai = chai;
+global.genHelpers = genHelpers;
+
+// Different Traceur generator message
+chai.assert._throw = chai.assert.throw;
+chai.assert.throw = function (fn, msg) {
+  if (msg === '"throw" on executing generator' ||
+      msg === '"next" on executing generator') {
+    msg = "Generator is already running";
+  } else if (msg === "Sent value to newborn generator") {
+    msg = /^attempt to send (.*?) to newborn generator$/;
+  }
+
+  return chai.assert._throw(fn, msg);
+};
+
+var run = function (task, done) {
+  var actual = task.actual;
+  var expect = task.expect;
+  var exec   = task.exec;
+  var opts   = task.options;
+
+  var getOpts = function (self) {
+    return _.merge({
+      filename: self.loc
+    }, opts);
+  };
+
+  var execCode = exec.code;
+  var result;
+
+  var checkAst = function (result) {
+    if (opts.noCheckAst) return;
+
+    var errors = esvalid.errors(result.ast.program);
+    if (errors.length) {
+      var msg = [];
+      _.each(errors, function (err) {
+        msg.push(err.message + " - " + JSON.stringify(err.node));
+      });
+      throw new Error(msg.join(". "));
+    }
+  };
+
+  if (execCode) {
+    result = transform(execCode, getOpts(exec));
+    checkAst(result);
+    execCode = result.code;
+
+    try {
+      var fakeRequire = function (loc) {
+        if (loc === "../../../src/runtime/polyfills/Number.js") {
+          return Number;
+        } else if (loc === "../../../src/runtime/polyfills/Math.js") {
+          return Math;
+        } else {
+          return require(path.resolve(exec.loc, "..", loc));
+        }
+      };
+
+      var fn = new Function("require", "done", execCode);
+      fn.call(global, fakeRequire, chai.assert, done);
+    } catch (err) {
+      err.message = exec.loc + ": " + err.message;
+      err.message += util.codeFrame(execCode);
+      throw err;
+    }
+  }
+
+  var actualCode = actual.code;
+  var expectCode = expect.code;
+  if (!execCode || actualCode) {
+    result     = transform(actualCode, getOpts(actual));
+    checkAst(result);
+    actualCode = result.code;
+
+    chai.expect(actualCode).to.be.equal(expectCode, actual.loc + " !== " + expect.loc);
+  }
+
+  if (task.sourceMap) {
+    chai.expect(result.map).to.deep.equal(task.sourceMap);
+  }
+
+  if (task.sourceMappings) {
+    var consumer = new sourceMap.SourceMapConsumer(result.map);
+
+    _.each(task.sourceMappings, function (mapping, i) {
+      var expect = mapping.original;
+
+      var actual = consumer.originalPositionFor(mapping.generated);
+      chai.expect({ line: actual.line, column: actual.column }).to.deep.equal(expect);
+    });
+  }
+};
+
+module.exports = function (suiteOpts, taskOpts, dynamicOpts) {
+  taskOpts = taskOpts || {};
+
+  require("../register")(taskOpts);
+
+  _.each(helper.get(suiteOpts.name, suiteOpts.loc), function (testSuite) {
+    if (_.contains(suiteOpts.ignoreSuites, testSuite.title)) return;
+
+    suite(suiteOpts.name + "/" + testSuite.title, function () {
+      _.each(testSuite.tests, function (task) {
+        if (_.contains(suiteOpts.ignoreTasks, task.title) || _.contains(suiteOpts.ignoreTasks, testSuite.title + "/" + task.title)) return;
+
+        var runTest = function (done) {
+          var runTask = function () {
+            try {
+              run(task, done);
+            } catch (err) {
+              if (task.options.after) task.options.after();
+              throw err;
+            }
+          };
+
+          _.extend(task.options, taskOpts);
+          if (dynamicOpts) dynamicOpts(task.options, task);
+
+          var throwMsg = task.options.throws;
+          if (throwMsg) {
+            // internal api doesn't have this option but it's best not to pollute
+            // the options object with useless options
+            delete task.options.throws;
+
+            assert.throws(runTask, function (err) {
+              return throwMsg === true || err.message.indexOf(throwMsg) >= 0;
+            });
+          } else {
+            runTask();
+          }
+        };
+
+        var callback;
+        if (task.options.asyncExec) {
+          callback = runTest;
+        } else {
+          callback = function () {
+            return runTest();
+          };
+        }
+
+        test(task.title, !task.disabled && callback);
+      });
+    });
+  });
+};

test/esnext.js

@@ -0,0 +1,5 @@
+if (!process.env.ALL_6TO5_TESTS) return;
+
+require("./_transformation-helper")({
+  name: "esnext"
+});

test/fixtures/esnext/es6-arrow-functions/arguments-refers-to-parent-function.js

@@ -0,0 +1,57 @@
+function makeMultiplier() {
+  // `arguments` should refer to `makeMultiplier`'s arguments.
+  return (n) => [].slice.call(arguments).reduce((a, b) => a * b) * n;
+}
+
+function toArray() {
+  // Intentionally nest arrow functions to ensure `arguments` is put inside
+  // `toArray`'s scope.
+  return (() => (arguments, (() => [].slice.call(arguments)).call())).call();
+}
+
+function returnDotArguments(object) {
+  // Ensure `arguments` is not treated as a reference to the magic value.
+  return (() => object.arguments).call();
+}
+
+function returnArgumentsObject() {
+  // Ensure `arguments` is not treated as a reference to the magic value.
+  return (() => ({arguments: 1})).call();
+}
+
+function makeArgumentsReturner() {
+  return (() => function() {
+    return [].slice.call(arguments);
+  }).call();
+}
+
+// i.e. 2 * 3 * 4 == 24, not 16 (4 * 4)
+assert.equal(
+  makeMultiplier(2, 3)(4),
+  24,
+  'ensure `arguments` is hoisted out to the first non-arrow scope'
+);
+
+assert.deepEqual(
+  toArray(1, 2, 3),
+  [1, 2, 3],
+  'ensure `arguments` is hoisted out to the first non-arrow scope'
+);
+
+assert.equal(
+  returnDotArguments({arguments: 1}),
+  1,
+  'member accesses with `arguments` property should not be replaced'
+);
+
+assert.deepEqual(
+  returnArgumentsObject(),
+  {arguments: 1},
+  'object property keys named `arguments` should not be replaced'
+);
+
+assert.deepEqual(
+  makeArgumentsReturner()(1, 2, 3),
+  [1, 2, 3],
+  'arguments should not be hoisted from inside non-arrow functions'
+);

test/fixtures/esnext/es6-arrow-functions/does-not-bind-this-from-standard-function.js

@@ -0,0 +1,5 @@
+var dynamicThisGetter = () => function () { return this; };
+assert.equal(
+  '(' + dynamicThisGetter.toString() + ')',
+  '(function () {\n  return function () {\n    return this;\n  };\n})'
+);

test/fixtures/esnext/es6-arrow-functions/empty-arrow-function.js

@@ -0,0 +1,2 @@
+var empty = () => {};
+assert.equal(empty(), undefined);

test/fixtures/esnext/es6-arrow-functions/handles-nested-context-bindings.js

@@ -0,0 +1,12 @@
+var obj = {
+  method: function() {
+    return () => (this, () => this);
+  },
+
+  method2: function() {
+    return () => () => this;
+  }
+};
+
+assert.strictEqual(obj.method()()(), obj);
+assert.strictEqual(obj.method2()()(), obj);

test/fixtures/esnext/es6-arrow-functions/no-parens-for-low-precedence-expression-body.js

@@ -0,0 +1,2 @@
+var square = x => x * x;
+assert.equal(square(4), 16);

test/fixtures/esnext/es6-arrow-functions/object-literal-needs-parens.js

@@ -0,0 +1,2 @@
+var keyMaker = val => ({ key: val });
+assert.deepEqual(keyMaker(9), { key: 9 });

test/fixtures/esnext/es6-arrow-functions/only-lexical-this-not-dynamic-this.js

@@ -0,0 +1,7 @@
+var obj = {
+  method: function() {
+    return () => this;
+  }
+};
+
+assert.strictEqual(obj.method()(), obj);

test/fixtures/esnext/es6-arrow-functions/passed-to-function.js

@@ -0,0 +1,2 @@
+var odds = [0, 2, 4].map(v => v + 1);
+assert.deepEqual(odds, [1, 3, 5]);

test/fixtures/esnext/es6-arrow-functions/single-param-does-not-need-parens.js

@@ -0,0 +1,2 @@
+var identity = x => x;
+assert.equal(identity(1), 1);

test/fixtures/esnext/es6-classes/anonymous-class.js

@@ -0,0 +1,29 @@
+var Animal = class {
+  sayHi() {
+    return 'Hi, I am a '+this.type()+'.';
+  }
+
+  static getName() {
+    return 'Animal';
+  }
+};
+
+var Dog = class extends Animal {
+  type() { return 'dog'; }
+
+  sayHi() {
+    return super() + ' WOOF!';
+  }
+
+  static getName() {
+    return super() + '/Dog';
+  }
+};
+
+assert.equal(new Dog().sayHi(), 'Hi, I am a dog. WOOF!');
+assert.equal(Dog.getName(), 'Animal/Dog');
+
+var count = 0;
+var Cat = class extends (function(){ count++; return Animal; })() {};
+
+assert.equal(count, 1);

test/fixtures/esnext/es6-classes/call-super-function.js

@@ -0,0 +1,21 @@
+class Animal {
+  sayHi() {
+    return 'I am an animal.'
+  }
+
+  sayOther() {
+    return 'WAT?!';
+  }
+}
+
+class Horse extends Animal {
+  sayHi() {
+    return super.sayOther();
+  }
+
+  sayOther() {
+    return 'I see dead objects.';
+  }
+}
+
+assert.equal(new Horse().sayHi(), 'WAT?!');

test/fixtures/esnext/es6-classes/class-expressions.js

@@ -0,0 +1,9 @@
+var Person = (class Person {});
+assert.equal(typeof Person, 'function');
+
+assert.equal(
+  (function(){ return (class Person {}); })().name,
+  'Person'
+);
+
+assert.equal(typeof (class {}), 'function');

test/fixtures/esnext/es6-classes/class-extend.js

@@ -0,0 +1,15 @@
+class Animal {
+  sayHi() {
+    return 'Hi, I am a '+this.type()+'.';
+  }
+}
+
+class Dog extends Animal {
+  type() { return 'dog'; }
+
+  sayHi() {
+    return super() + ' WOOF!';
+  }
+}
+
+assert.equal(new Dog().sayHi(), 'Hi, I am a dog. WOOF!');

test/fixtures/esnext/es6-classes/class-with-constructor.js

@@ -0,0 +1,14 @@
+class Multiplier {
+  constructor(n=1) {
+    this.n = n;
+  }
+
+  multiply(n=1) {
+    return n * this.n;
+  }
+}
+
+assert.equal(new Multiplier().n, 1);
+assert.equal(new Multiplier(6).n, 6);
+assert.equal(new Multiplier().multiply(), 1);
+assert.equal(new Multiplier(2).multiply(3), 6);

test/fixtures/esnext/es6-classes/class-with-method-declaration.js

@@ -0,0 +1,10 @@
+class Person {
+  getName() {
+    return this.firstName + ' ' + this.lastName;
+  }
+}
+
+var me = new Person();
+me.firstName = 'Brian';
+me.lastName = 'Donovan';
+assert.equal(me.getName(), 'Brian Donovan');

test/fixtures/esnext/es6-classes/empty-named-class.js

@@ -0,0 +1,5 @@
+class Foo {
+}
+
+assert.equal(new Foo().constructor, Foo, 'Foo instances should have Foo as constructor');
+assert.ok(new Foo() instanceof Foo, 'Foo instances should be `instanceof` Foo');

test/fixtures/esnext/es6-classes/enumerable.js

@@ -0,0 +1,20 @@
+class Point {
+  constructor(x, y) {
+    this.x = x;
+    this.y = y;
+  }
+
+  toString() {
+    return '(' + this.x + ', ' + this.y + ')';
+  }
+}
+
+var point = new Point(1, 2);
+var keys = [];
+
+for (var key in point) {
+  keys.push(key);
+}
+
+assert.equal(point.toString(), '(1, 2)');
+assert.deepEqual(keys.sort(), ['toString', 'x', 'y']);

test/fixtures/esnext/es6-classes/explicit-super-in-constructor.js

@@ -0,0 +1,15 @@
+class Point {
+  constructor(x, y) {
+    this.x = x;
+    this.y = y;
+  }
+}
+
+class ZeroPoint extends Point {
+  constructor() {
+    super(0, 0);
+  }
+}
+
+assert.equal(new ZeroPoint().x, 0);
+assert.equal(new ZeroPoint().y, 0);

test/fixtures/esnext/es6-classes/extends-null.js

@@ -0,0 +1,4 @@
+class Obj extends null {}
+
+assert.strictEqual(Obj.toString, Function.toString);
+assert.strictEqual(new Obj().toString, undefined);

test/fixtures/esnext/es6-classes/getter-setter-super.js

@@ -0,0 +1,15 @@
+class Animal {
+  get sound() {
+    return 'I am a ' + this.type + '.';
+  }
+}
+
+class Cat extends Animal {
+  get type() { return 'cat'; }
+
+  get sound() {
+    return super.sound + ' MEOW!';
+  }
+}
+
+assert.equal(new Cat().sound, 'I am a cat. MEOW!');

test/fixtures/esnext/es6-classes/getter-setter.js

@@ -0,0 +1,28 @@
+class Person {
+  constructor(firstName, lastName) {
+    this.firstName = firstName;
+    this.lastName = lastName;
+  }
+
+  get name() {
+    return this.firstName + ' ' + this.lastName;
+  }
+
+  set name(name) {
+    var parts = name.split(' ');
+    this.firstName = parts[0];
+    this.lastName = parts[1];
+  }
+}
+
+var mazer = new Person('Mazer', 'Rackham');
+assert.equal(mazer.name, 'Mazer Rackham');
+mazer.name = 'Ender Wiggin';
+assert.equal(mazer.firstName, 'Ender');
+assert.equal(mazer.lastName, 'Wiggin');
+
+var forLoopProperties = [];
+for (var key in mazer) {
+  forLoopProperties.push(key);
+}
+assert.ok(forLoopProperties.indexOf('name') >= 0, 'getters/setters are enumerable');

test/fixtures/esnext/es6-classes/implicit-superclass.js

@@ -0,0 +1,9 @@
+class Obj {
+  constructor() {
+    super();
+  }
+}
+
+assert.doesNotThrow(function() {
+  new Obj();
+});

test/fixtures/esnext/es6-classes/method-declaration-with-arguments.js

@@ -0,0 +1,7 @@
+class Tripler {
+  triple(n) {
+    return n * 3;
+  }
+}
+
+assert.equal(new Tripler().triple(2), 6);

test/fixtures/esnext/es6-classes/methods-are-writable.js

@@ -0,0 +1,12 @@
+var value;
+
+class Foo {
+  foo() {
+    value = 1;
+  }
+}
+
+var foo = new Foo();
+foo.foo = function() { value = 2; };
+foo.foo();
+assert.equal(value, 2);

test/fixtures/esnext/es6-classes/methods-with-rest-params.js

@@ -0,0 +1,28 @@
+class Joiner {
+  constructor(string) {
+    this.string = string;
+  }
+
+  join(...items) {
+    return items.join(this.string);
+  }
+
+  static join(string, ...items) {
+    var joiner = new this(string);
+    // TODO: use spread params here
+    return joiner.join.apply(joiner, items);
+  }
+}
+
+class ArrayLike {
+  constructor(...items) {
+    items.forEach(function(item, i) {
+      this[i] = item;
+    }.bind(this));
+    this.length = items.length;
+  }
+}
+
+var joiner = new Joiner(' & ');
+assert.equal(joiner.join(4, 5, 6), '4 & 5 & 6');
+assert.equal(new ArrayLike('a', 'b')[1], 'b');

test/fixtures/esnext/es6-classes/static-getter.js

@@ -0,0 +1,12 @@
+class Point {
+  constructor(x, y) {
+    this.x = x;
+    this.y = y;
+  }
+
+  static get ORIGIN() {
+    return new this(0, 0);
+  }
+}
+
+assert.deepEqual(Point.ORIGIN, new Point(0, 0));

test/fixtures/esnext/es6-classes/static-method.js

@@ -0,0 +1,30 @@
+class Tripler {
+  static triple(n=1) {
+    return n * 3;
+  }
+
+  static toString() {
+    return '3' + super() + '3';
+  }
+}
+
+class MegaTripler extends Tripler {
+  static triple(n=1) {
+    return super(n) * super(n);
+  }
+}
+
+var tripler = new Tripler();
+
+assert.equal(Tripler.triple(), 3);
+assert.equal(Tripler.triple(2), 6);
+assert.equal(tripler.triple, undefined);
+
+assert.equal(Tripler.toString(), '3' + Object.toString.call(Tripler) + '3');
+
+var mega = new MegaTripler();
+
+assert.equal(MegaTripler.triple(2), 36);
+assert.equal(mega.triple, undefined);
+
+assert.equal(MegaTripler.toString(), '3' + Object.toString.call(MegaTripler) + '3');