v2.10.0

Add --reactCompat option to cli

.gitignore

@@ -10,3 +10,4 @@ test/tmp
 /runtime.js
 coverage
 dist
+.package.json

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "vendor/regenerator"]
 	path = vendor/regenerator
 	url = https://github.com/facebook/regenerator
+[submodule "vendor/test262"]
+	path = vendor/test262
+	url = https://github.com/tc39/test262

.npmignore

@@ -9,3 +9,4 @@ Makefile
 dist
 tests.json
 CHANGELOG.md
+.package.json

CHANGELOG.md

@@ -11,6 +11,90 @@
 
 _Note: Gaps between patch versions are faulty/broken releases._
 
+## 2.10.0
+
+ * **New Feature**
+  * Add `classesFastSuper` optional transformer that doesn't support parent getters and prototype changing.
+  * Add `forOfFast` transformer that speeds up `for...of` on arrays but produces more code.
+  * Add `--react-compat` to `bin/6to5`.
+ * **Spec Compliancy**
+  * Disallow setters without a single parameter.
+  * Add `configurable` and `writable` to defined properties.
+  * Use define instead of assignment for class methods.
+ * **Polish**
+  * Fix bin name in `6to5-node --help`.
+  * Fix shorthand `--whitelist` name in `bin/6to5`.
+ * **Internal**
+  * Hot code optimisation of traversal etc thanks to [gaearon](https://github.com/gaearon).
+
+## 2.9.4
+
+ * **Bug Fix**
+  * Support `UpdateExpression`s as `MemberExpression` objects.
+
+## 2.9.3
+
+ * **Bug Fix**
+  * Remove `exportsWildcard` helper in favor of `defaults`.
+
+## 2.9.2
+
+ * **Bug Fix**
+  * Pass `exports` to `exportWildcard` helper to allow for use inside the optional runtime.
+
+## 2.9.1
+
+ * **Bug Fix**
+  * Fix runtime generator breaking the helper inclusion loop.
+
+## 2.9.0
+
+ * **Internal**
+  * Upgrade `acorn-6to5`.
+    * Now supports destructuring shorthand properties.
+
+## 2.8.1
+
+ * **Bug Fix**
+  * Fix computed accessors on object literals.
+
+## 2.8.0
+
+ * **New Feature**
+  * Add `commonStrict`, `amdStrict` and `umdStrict` module formatters that remove `module.exports` interop assignment.
+  * Add `--indent` option to the 6to5 CLI.
+
+## 2.7.4
+
+ * **Polish**
+  * Inherit assignments from their declaration in destructuring.
+  * Properly align multi-declarator variable declarations.
+
+## 2.7.3
+
+ * **Polish**
+  * Indent and add newlines to `React.createElement` calls in `react` transformer.
+  * Remove `Object.assign` calls and replace it with an `extends` helper.
+
+## 2.7.1
+
+ * **New Feature**
+  * Expose `version` on browser and node API.
+ * **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**

Makefile

@@ -6,7 +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 bootstrap
+.PHONY: clean test test-cov test-clean lint test-travis test-simple test-all test-browser publish build bootstrap publish-core
 
 build:
 	mkdir -p dist
@@ -27,12 +27,8 @@ 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
+	$(JSHINT_CMD) --reporter node_modules/jshint-stylish/stylish.js lib bin
 
 test-clean:
 	rm -rf test/tmp
@@ -41,14 +37,23 @@ 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-spec:
-	node $(ISTANBUL_CMD) $(MOCHA_CMD) -- --reporter spec
-
-test-travis: test-spec
+test-travis: bootstrap
+	node $(ISTANBUL_CMD) $(MOCHA_CMD) --
 	if test -n "$$CODECLIMATE_REPO_TOKEN"; then codeclimate < coverage/lcov.info; fi
 
 test-browser:
@@ -66,6 +71,9 @@ publish:
 
 	make test
 
+	read -p "Version: "  version; \
+	npm version $$version --message "v%s"
+
 	make build
 	cp dist/6to5.min.js browser.js
 	cp dist/polyfill.min.js browser-polyfill.js
@@ -74,12 +82,21 @@ publish:
 	node bin/cache-templates
 	test -f templates.json
 
-	read -p "Version: "  version; \
-  npm version $$version --message "v%s"
 	npm publish
 
 	git push --follow-tags
 
+	# generate
+	bin/generate-core-package-json >package2.json
+	mv package.json .package.json
+	mv package2.json package.json
+
+	npm publish
+
+	# restore
+	rm -rf package.json
+	mv .package.json package.json
+
 	rm -rf templates.json browser.js runtime.js browser-polyfill.js
 
 bootstrap:

NOTES.md

@@ -1,8 +1,12 @@
 # Notes
 
- * Wildcard exports/imports wont normalise if `export default` is a non-object.
+ * Wildcard exports/imports wont normalise if `export default` is a non-object. See [#224](https://github.com/6to5/6to5/issues/224).
 
 ## 3.0.0 breaking changes
 
  * Remove `allowImportExportEverywhere` option from acorn.
  * Remove this shorthand from playground.
+ * Remove `super()` inside non-constructors - add descriptive error message.
+ * Split up ES5 getter/setter transforming and ES6 property methods into separate transformers.
+ * Add autoindentation.
+ * Move `super` transformation from classes into a separate transformer that also supports object expressions.

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);
-      });
-    });
-  });
-});

bin/6to5/index.js

@@ -15,14 +15,16 @@ commander.option("-e, --experimental", "Enable experimental support for proposed
 commander.option("-p, --playground", "Enable playground support");
 
 commander.option("-m, --modules [modules]", "Module formatter type to use [common]", "common");
-commander.option("-w, --whitelist [whitelist]", "Whitelist of transformers to ONLY use", util.list);
+commander.option("-l, --whitelist [whitelist]", "Whitelist of transformers to ONLY use", util.list);
 commander.option("-b, --blacklist [blacklist]", "Blacklist of transformers to NOT use", util.list);
 commander.option("-i, --optional [list]", "List of optional transformers to enable", util.list);
 commander.option("-o, --out-file [out]", "Compile all input files into a single file");
 commander.option("-d, --out-dir [out]", "Compile an input directory of modules into an output directory");
 commander.option("-c, --remove-comments", "Remove comments from the compiled code", false);
+commander.option("-I, --indent [width]", "Indent width [2]", 2);
 commander.option("-a, --amd-module-ids", "Insert module id in AMD modules", false); // todo: remove in 3.0.0
 commander.option("-m, --module-ids", "Insert module id in modules", false);
+commander.option("-R, --react-compat", "Makes the react transformer produce pre-v0.12 code");
 
 commander.on("--help", function(){
   var outKeys = function (title, obj) {
@@ -108,7 +110,13 @@ exports.opts = {
   optional:      commander.optional,
   comments:      !commander.removeComments,
   runtime:       commander.runtime,
-  modules:       commander.modules
+  modules:       commander.modules,
+  reactCompat:   commander.reactCompat,
+  format: {
+    indent: {
+      style:     util.repeat(parseInt(commander.indent))
+    }
+  }
 };
 
 var fn;

bin/_6to5-node

@@ -10,29 +10,31 @@ var util       = require("../lib/6to5/util");
 var vm         = require("vm");
 var _          = require("lodash");
 
-commander.option("-e, --eval [script]", "Evaluate script");
-commander.option("-p, --print", "Evaluate script and print result");
-commander.option("-i, --ignore [regex]", "Ignore all files that match this regex when using the require hook");
-commander.option("-x, --extensions [extensions]", "List of extensions to hook into [.es6,.js]");
-commander.option("-r, --experimental", "Enable experimental support for proposed ES7 features");
-commander.option("-g, --playground", "Enable playground support");
-commander.option("-c, --cache", "Cache compiled files and require paths");
+var program = new commander.Command("6to5-node");
+
+program.option("-e, --eval [script]", "Evaluate script");
+program.option("-p, --print", "Evaluate script and print result");
+program.option("-i, --ignore [regex]", "Ignore all files that match this regex when using the require hook");
+program.option("-x, --extensions [extensions]", "List of extensions to hook into [.es6,.js]");
+program.option("-r, --experimental", "Enable experimental support for proposed ES7 features");
+program.option("-g, --playground", "Enable playground support");
+program.option("-c, --cache", "Cache compiled files and require paths");
 
 var pkg = require("../package.json");
-commander.version(pkg.version);
-commander.usage("[options] [ -e script | script.js ] [arguments]");
-commander.parse(process.argv);
+program.version(pkg.version);
+program.usage("[options] [ -e script | script.js ] [arguments]");
+program.parse(process.argv);
 
-if (commander.cache) roadrunner.load();
+if (program.cache) roadrunner.load();
 
 //
 
 to5.register({
-  experimental: commander.experimental,
-  extensions:   commander.extensions,
-  playground:   commander.playground,
-  ignore:       commander.ignore,
-  cache:        commander.cache && roadrunner.get("6to5")
+  experimental: program.experimental,
+  extensions:   program.extensions,
+  playground:   program.playground,
+  ignore:       program.ignore,
+  cache:        program.cache && roadrunner.get("6to5")
 });
 
 //
@@ -41,17 +43,17 @@ var _eval = function (code, filename) {
   code = to5.transform(code, {
     filename: filename,
     blacklist: ["useStrict"],
-    experimental: commander.experimental,
-    playground: commander.playground
+    experimental: program.experimental,
+    playground: program.playground
   }).code;
   return vm.runInThisContext(code, filename);
 };
 
-if (commander.eval) {
-  var result = _eval(commander.eval, "eval");
-  if (commander.print) console.log(result);
+if (program.eval) {
+  var result = _eval(program.eval, "eval");
+  if (program.print) console.log(result);
 } else {
-  if (commander.args.length) {
+  if (program.args.length) {
     // slice all arguments up to the first filename since they're 6to5 args that we handle
     var args = process.argv.slice(2);
 
@@ -77,7 +79,7 @@ if (commander.eval) {
   }
 }
 
-if (commander.cache) roadrunner.save();
+if (program.cache) roadrunner.save();
 
 function replStart() {
   repl.start({

bin/generate-core-package-json

@@ -0,0 +1,11 @@
+#!/usr/bin/env node
+
+var pkg = require("../package.json");
+pkg.name += "-core";
+delete pkg.dependencies.chokidar;
+delete pkg.optionalDependencies;
+delete pkg.devDependencies;
+delete pkg.preferGlobal;
+delete pkg.scripts;
+delete pkg.bin;
+console.log(JSON.stringify(pkg, null, "  "));

doc/caveats.md

@@ -1,89 +0,0 @@
----
-layout: docs
-title: Caveats
-description: Just some things to keep in mind when using 6to5.
-permalink: /docs/caveats/
-redirect_from: /caveats.html
----
-
-## Polyfills
-
-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 on IE <= 10 so static properties
-**will not** be inherited.
-
-You can use the `protoToAssign` optional transformer that will transform all
-`__proto__` assignments to a method that will shallowly copy it over all
-properties.
-
-```javascript
-require("6to5").transform("code", { optional: ["protoToAssign"] });
-```
-
-```sh
-$ 6to5 --optional protoToAssign script.js
-```
-
-This means that the following **will** work:
-
-```javascript
-var foo = { a: 1 };
-var bar = { b: 2 };
-bar.__proto__ = foo;
-bar.a; // 1
-bar.b; // 2
-```
-
-however the following **will not**:
-
-```javascript
-var foo = { a: 1 };
-var bar = { b: 2 };
-bar.__proto__ = foo;
-bar.a; // 1
-foo.a = 2;
-bar.a; // 1 - should be 2 but remember that nothing is bound and it's a straight copy
-```
-
-### 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/compare.md

@@ -1,143 +0,0 @@
----
-layout: docs
-title: Compare
-description: Differences between 6to5 and other ES6 transpilers.
-permalink: /docs/compare/
-redirect_from: /differences.html
----
-
-## Differences
-
-### 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:
-
-```js
-var seattlers = [for (c of customers) if (c.city == "Seattle") { name: c.name, age: c.age }];
-```
-
-is generated to the following with 6to5:
-
-```js
-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:
-
-```js
-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 | es6now | jstransform |
-| ---------------------------- | ---- | ------- | -------------- | ------ | ----------- |
-| Source maps                  | ✓    | ✓       | ✓              |        | ✓           |
-| No compiler global pollution | ✓    |         | ✓              |        | ✓           |
-| Optional runtime             | ✓    |         | ✓              |        | ✓           |
-| Browser compiler             | ✓    | ✓       |                |        |             |
-
-### Language Support
-
-|                              | 6to5 | Traceur | es6-transpiler | 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/index.md

@@ -0,0 +1 @@
+See [6to5.github.io/docs](https://github.com/6to5/6to5.github.io/tree/master/docs).

doc/setup.md

@@ -1,708 +0,0 @@
----
-layout: docs
-title: Setup
-description: Guides on how to setup 6to5 in whatever environment you might be working in.
-permalink: /docs/setup/
-redirect_from: /plugins.html
----
-
-<blockquote class="to5-callout to5-callout-info">
-  <h4>Find your guide</h4>
-  <p>
-    It doesn't matter if you're using Node.js or Rails, Gulp or Grunt, there's likely a guide on
-    this page to help guide you. Go ahead and <span class="label label-info">&#8984; + F</span>
-    whatever you're looking for. If it doesn't happen to be on this page you might want to stop by
-    our <a href="https://gitter.im/6to5/6to5">support chat</a>.
-  </p>
-</blockquote>
-
-## Node.js
-
-### CLI
-
-**Install**
-
-```sh
-$ npm install --global 6to5
-```
-
-**Usage**
-
-```sh
-$ 6to5 script.js
-```
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    For full documentation on the 6to5 CLI see the
-    <a href="/docs/usage/cli/">usage docs</a>.
-  </p>
-</blockquote>
-
-### Require Hook
-
-**Install**
-
-```sh
-$ npm install 6to5
-```
-
-**Usage**
-
-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.
-
-```javascript
-require('6to5/register');
-```
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    For full documentation on the 6to5 require hook see the
-    <a href="/docs/usage/require/">usage docs</a>.
-  </p>
-</blockquote>
-
-## Rails
-
-### Sprockets
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>sprockets-es6</strong>'s
-    <a href="https://github.com/josh/sprockets-es6">repo</a> for more info. If
-    you find any bugs please
-    <a href="https://github.com/josh/sprockets-es6/issues">report them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```sh
-$ gem install sprockets-es6
-```
-
-**Usage**
-
-```rb
-# Gemfile
-gem 'sprockets'
-gem 'sprockets-es6'
-```
-
-```rb
-require 'sprockets/es6'
-```
-
-## Build Systems
-
-### Brocolli
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>broccoli-6to5-transpiler</strong>'s
-    <a href="https://github.com/6to5/broccoli-6to5-transpiler">repo</a> for more
-    info. If you find any bugs please
-    <a href="https://github.com/6to5/broccoli-6to5-transpiler/issues">report
-    them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```sh
-$ npm install --save-dev broccoli-6to5-transpiler
-```
-
-**Usage**
-
-```js
-var to5Transpiler = require('broccoli-6to5-transpiler');
-var scriptTree = to5Transpiler(inputTree, options);
-```
-
-<blockquote class="to5-callout to5-callout-warning">
-  <h4>Source maps</h4>
-  <p>
-    Currently this plugin only support inline source maps. If you need separate
-    source map feature, we welcome you to submit a pull request.
-  </p>
-</blockquote>
-
-### Browserify
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>6to5ify</strong>'s
-    <a href="https://github.com/6to5/6to5ify">repo</a> for more info. If you
-    find any bugs please
-    <a href="https://github.com/6to5/6to5ify/issues">report them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```sh
-$ npm install --save-dev 6to5ify
-```
-
-**Usage via CLI**
-
-```sh
-$ browserify script.js -t 6to5ify --outfile bundle.js
-```
-
-**Usage via Node.js**
-
-```js
-browserify({ debug: true })
-  .transform(to5ify);
-```
-
-Or a more complete example:
-
-```js
-var fs = require('fs');
-var browserify = require('browserify');
-var to5ify = require('6to5ify');
-
-browserify({ debug: true })
-  .transform(to5ify)
-  .require('./script.js', { entry: true })
-  .bundle()
-  .on('error', function (err) { console.log('Error: ' + err.message); })
-  .pipe(fs.createWriteStream("bundle.js"));
-```
-**Passing Options**
-
-```sh
-$ browserify -d -e script.js -t [ 6to5ify --blacklist generators ]
-```
-
-```js
-browserify().transform(to5ify.configure({
-  blacklist: ['generators']
-}))
-```
-
-<blockquote class="to5-callout to5-callout-info">
-  <h4>More info</h4>
-  <p>
-    For more information see the
-    <a href="https://github.com/6to5/6to5ify">6to5ify README</a>
-  </p>
-</blockquote>
-
-### Brunch
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>6to5-brunch</strong>'s
-    <a href="https://github.com/6to5/6to5-brunch">repo</a> for more info. If you
-    find any bugs please
-    <a href="https://github.com/6to5/6to5-brunch/issues">report them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```sh
-$ npm install --save-dev 6to5-brunch
-```
-
-**Configuring**
-
-Set 6to5 options in your brunch config (such as `brunch-config.coffee`) except
-for `filename` and `sourceMap` which are handled internally.
-
-```coffee
-plugins:
-  ES6to5:
-    whitelist: ['arrowFunctions']
-    format:
-      semicolons: false
-```
-
-### Duo
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>duo-6to5</strong>'s
-    <a href="https://github.com/6to5/duo-6to5">repo</a> for more info. If you
-    find any bugs please
-    <a href="https://github.com/6to5/duo-6to5/issues">report them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```sh
-$ npm install --save-dev duo-6to5
-```
-
-**Usage via CLI**
-
-```sh
-$ duo --use duo-6to5
-```
-
-**Usage via Node.js**
-
-```js
-Duo(root)
-  .entry(entry)
-  .use(to5)
-  .run(fn);
-```
-
-### Gobble
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>gobble-6to5</strong>'s
-    <a href="https://github.com/6to5/gobble-6to5">repo</a> for more info. If you
-    find any bugs please
-    <a href="https://github.com/6to5/gobble-6to5/issues">report them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```sh
-$ npm install --save-dev gobble-6to5
-```
-
-**Usage**
-
-The `options` argument, if specified, is passed to 6to5.
-
-```
-var gobble = require('gobble');
-module.exports = gobble('src').transform('6to5', options);
-```
-
-**Source maps**
-
-Sourcemaps are created by default (all the relevant information is filled in by
-Gobble, you don't need to specify `sourceMapName` options etc). If you don't
-want that, pass `sourceMap: false`.
-
-### Grunt
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>grunt-6to5</strong>'s
-    <a href="https://github.com/6to5/grunt-6to5">repo</a> for more info. If you
-    find any bugs please
-    <a href="https://github.com/6to5/grunt-6to5/issues">report them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```sh
-$ npm install --save-dev grunt-6to5
-```
-
-**Usage**
-
-```js
-require('load-grunt-tasks')(grunt); // npm install --save-dev load-grunt-tasks
-
-grunt.initConfig({
-  '6to5': {
-    options: {
-      sourceMap: true
-    },
-    dist: {
-      files: {
-        'dist/app.js': 'src/app.js'
-      }
-    }
-  }
-});
-
-grunt.registerTask('default', ['6to5']);
-```
-
-### Gulp
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>gulp-6to5</strong>'s
-    <a href="https://github.com/6to5/gulp-6to5">repo</a> for more info. If you
-    find any bugs please
-    <a href="https://github.com/6to5/gulp-6to5/issues">report them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```sh
-$ npm install --save-dev gulp-6to5
-```
-
-**Usage**
-
-```js
-var gulp = require('gulp');
-var to5 = require('gulp-6to5');
-
-gulp.task('default', function () {
-  return gulp.src('src/app.js')
-    .pipe(to5())
-    .pipe(gulp.dest('dist'));
-});
-```
-
-**Source maps**
-
-Use [gulp-sourcemaps](https://github.com/floridoo/gulp-sourcemaps) like this:
-
-```js
-var gulp = require('gulp');
-var sourcemaps = require('gulp-sourcemaps');
-var to5 = require('gulp-6to5');
-var concat = require('gulp-concat');
-
-gulp.task('default', function () {
-  return gulp.src('src/**/*.js')
-    .pipe(sourcemaps.init())
-    .pipe(to5())
-    .pipe(concat('all.js'))
-    .pipe(sourcemaps.write('.'))
-    .pipe(gulp.dest('dist'));
-});
-```
-
-### Webpack
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>6to5-loader</strong>'s
-    <a href="https://github.com/6to5/6to5-loader">repo</a> for more info. If you
-    find any bugs please
-    <a href="https://github.com/6to5/6to5-loader/issues">report them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```sh
-$ npm install --save-dev 6to5-loader
-```
-
-**Usage via loader**
-
-```js
-import Animal from '6to5!./Animal.js';
-
-class Person extends Animal {
-  constructor(arg='default') {
-    this.eat = 'Happy Meal';
-  }
-}
-
-export default Person;
-```
-```js
-var Person = require('6to5!./Person.js').default;
-new Person();
-```
-
-**Usage via config**
-
-```js
-module: {
-  loaders: [
-    { test: /\.js$/, exclude: /node_modules/, loader: '6to5-loader'}
-  ]
-}
-```
-
-and then import normally:
-
-```js
-import Person from './Person.js';
-```
-
-<blockquote class="to5-callout to5-callout-warning">
-  <h4>Troubleshooting</h4>
-  <p>
-    For additional information on how to troubleshoot **6to5-loader** please
-    see the
-    <a href="https://github.com/6to5/6to5-loader#troubleshooting">README</a>.
-  </p>
-</blockquote>
-
-## Misc
-
-### Connect
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>6to5-connect</strong>'s
-    <a href="https://github.com/6to5/6to5-connect">repo</a> for more info. If
-    you find any bugs please
-    <a href="https://github.com/6to5/6to5-connect/issues">report them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```js
-$ npm install 6to5-connect
-```
-
-**Usage**
-
-```js
-var to5Middleware = require('6to5-connect');
-
-app.use(to5Middleware({
-  options: {
-    // options to use when transforming files
-  },
-  src: 'assets',
-  dest: 'cache'
-}));
-
-app.use(connect.static('cache'));
-```
-
-### Jade
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>jade-6to5</strong>'s
-    <a href="https://github.com/6to5/jade-6to5">repo</a> for more info. If you
-    find any bugs please
-    <a href="https://github.com/6to5/jade-6to5/issues">report them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```js
-$ npm install jade-6to5
-```
-
-**Usage**
-
-```js
-var jade = require('jade');
-var to5 = require('jade-6to5');
-
-jade.filters.to5 = to5({});
-```
-
-OR
-
-```js
-var jade = require('jade');
-var to5 = require('jade-6to5');
-
-jade = to5({}, jade);
-```
-
-Now you can use ES6 in your jade templates as following.
-
-```jade
-script
-  :to5
-    console.log('Hello World !!!');
-    class Person {
-      constructor(name) {
-        this.name = name;
-      }
-      sayName(){
-        console.log(`Hello, my name is ${this.name}`);
-      }
-    }
-    var person = new Person('Apoxx');
-    person.sayName();
-```
-
-### Jest
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>6to5-jest</strong>'s
-    <a href="https://github.com/6to5/6to5-jest">repo</a> for more info. If you
-    find any bugs please
-    <a href="https://github.com/6to5/6to5-jest/issues">report them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```sh
-$ npm install --save-dev 6to5-jest
-```
-
-**Usage**
-
-In your `package.json` file please make the following changes:
-
-```
-{
-  "dependencies": {
-    "6to5-jest": "*",
-    "jest": "*"
-  },
-  "scripts": {
-    "test": "jest"
-  },
-  "jest": {
-    "scriptPreprocessor": "<rootDir>/node_modules/6to5-jest",
-    "testFileExtensions": ["es6", "js"],
-    "moduleFileExtensions": ["js", "json", "es6"]
-  }
-}
-```
-
-### Karma
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>karma-6to5-preprocessor</strong>'s
-    <a href="https://github.com/6to5/karma-6to5-preprocessor">repo</a> for more
-    info. If you find any bugs please
-    <a href="https://github.com/6to5/karma-6to5-preprocessor/issues">report them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```js
-npm install --save-dev karma-6to5-preprocessor
-```
-
-**Usage**
-
-See 6to5 options for more details.
-
-Given `options` properties are passed to 6to5 with no change except:
-
-- `filename`
-- `sourceMapName`
-- `sourceFileName`
-
-Because they should differ from file to file, corresponding configuration
-functions are available.
-
-For example, inline sourcemap configuration would look like the following.
-
-```js
-module.exports = function(config) {
-  config.set({
-    files: [
-      'src/**/*.js',
-      'test/**/*.js'
-    ],
-    preprocessors: {
-      'src/**/*.js': ['6to5'],
-      'test/**/*.js': ['6to5']
-    },
-    '6to5Preprocessor': {
-      options: {
-        sourceMap: 'inline'
-      },
-      filename: function(file) {
-        return file.originalPath.replace(/\.js$/, '.es5.js');
-      },
-      sourceFileName: function(file) {
-        return file.originalPath;
-      }
-    }
-  });
-};
-```
-
-### Mocha
-
-<blockquote class="to5-callout to5-callout-info">
-  <p>
-    See <strong>6to5-mocha</strong>'s
-    <a href="https://github.com/6to5/6to5-mocha">repo</a> for more info. If you
-    find any bugs please
-    <a href="https://github.com/6to5/6to5-mocha/issues">report them</a>.
-  </p>
-  <p>
-    <em>Issues with the output should be reported on the 6to5
-    <a href="https://github.com/6to5/6to5/issues">issue tracker</a></em>.
-  </p>
-</blockquote>
-
-**Install**
-
-```sh
-$ npm install --save-dev 6to5
-```
-
-**Usage**
-
-```js
-{
-  "scripts": {
-    "test": "mocha --require 6to5/register"
-  },
-  "devDependencies": {
-    "6to5": "*",
-    "mocha": "*"
-  }
-}
-```

doc/tour.md

@@ -1,771 +0,0 @@
----
-layout: docs
-title: Tour
-description: A detailed overview of ECMAScript 6 features.
-permalink: /docs/tour/
-redirect_from: /features.html
----
-
-<blockquote class="to5-callout to5-callout-info">
-  <h4>es6features</h4>
-  <p>
-    This document is taken from Luke Hoban's excellent
-    <a href="http://git.io/es6features">es6features</a> repo. Go give it a star
-    on GitHub!
-  </p>
-</blockquote>
-
-<blockquote class="to5-callout to5-callout-info">
-  <h4>REPL</h4>
-  <p>
-    Be sure to try these features out in the online
-    <a href="repl.html">REPL</a>.
-  </p>
-</blockquote>
-
-## Introduction
-
-> ECMAScript 6 is the upcoming version of the ECMAScript standard.  This
-standard is targeting ratification in June 2015.  ES6 is a significant update to
-the language, and the first update to the language since ES5 was standardized in
-2009. Implementation of these features in major JavaScript engines is
-[underway now](http://kangax.github.io/es5-compat-table/es6/).
-
-See the [draft ES6 standard](https://people.mozilla.org/~jorendorff/es6-draft.html)
-for full specification of the ECMAScript 6 language.
-
-## ECMAScript 6 Features
-
-### Arrows
-
-Arrows are a function shorthand using the `=>` syntax.  They are syntactically
-similar to the related feature in C#, Java 8 and CoffeeScript.  They support
-both expression and statement bodies.  Unlike functions, arrows share the same
-lexical `this` as their surrounding code.
-
-```js
-// 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));
-  }
-}
-```
-
-### Classes
-
-ES6 classes are a simple sugar over the prototype-based OO pattern.  Having a
-single convenient declarative form makes class patterns easier to use, and
-encourages interoperability.  Classes support prototype-based inheritance, super
-calls, instance and static methods and constructors.
-
-```js
-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();
-  }
-}
-```
-
-### Enhanced Object Literals
-
-Object literals are extended to support setting the prototype at construction,
-shorthand for `foo: foo` assignments, defining methods and making super calls.
-Together, these also bring object literals and class declarations closer
-together, and let object-based design benefit from some of the same
-conveniences.
-
-```js
-var obj = {
-    // __proto__
-    __proto__: theProtoObj,
-    // Shorthand for ‘handler: handler’
-    handler,
-    // Methods
-    toString() {
-     // Super calls
-     return "d " + super.toString();
-    },
-    // Computed (dynamic) property names
-    [ 'prop_' + (() => 42)() ]: 42
-};
-```
-
-<blockquote class="to5-callout to5-callout-warning">
-  <p>
-    <code>__proto__</code> support comes from the JavaScript engine running
-    your program. Although most support the now standard property,
-    <a href="http://kangax.github.io/compat-table/es6/#__proto___in_object_literals">some do not</a>.
-  </p>
-</blockquote>
-
-### Template Strings
-
-Template strings provide syntactic sugar for constructing strings. This is
-similar to string interpolation features in Perl, Python and more. Optionally, a
-tag can be added to allow the string construction to be customized, avoiding
-injection attacks or constructing higher level data structures from string
-contents.
-
-```js
-// Basic literal string creation
-`In JavaScript '\n' is a line-feed.`
-
-// Multiline strings
-`In JavaScript this is
- not legal.`
-
-// Construct a DOM query
-var name = "Bob", time = "today";
-`Hello ${name}, how are you ${time}?`
-
-// Construct an HTTP request prefix is used to interpret the replacements and construction
-GET`http://foo.org/bar?a=${a}&b=${b}
-    Content-Type: application/json
-    X-Credentials: ${credentials}
-    { "foo": ${foo},
-      "bar": ${bar}}`(myOnReadyStateChangeHandler);
-```
-
-### Destructuring
-
-Destructuring allows binding using pattern matching, with support for matching
-arrays and objects.  Destructuring is fail-soft, similar to standard object
-lookup `foo["bar"]`, producing `undefined` values when not found.
-
-```js
-// 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;
-
-// Fail-soft destructuring with defaults
-var [a = 1] = [];
-a === 1;
-```
-
-### Default + Rest + Spread
-
-Callee-evaluated default parameter values. Turn an array into consecutive
-arguments in a function call. Bind trailing parameters to an array. Rest
-replaces the need for `arguments` and addresses common cases more directly.
-
-```js
-function f(x, y=12) {
-  // y is 12 if not passed (or passed as undefined)
-  return x + y;
-}
-f(3) == 15
-```
-```js
-function f(x, ...y) {
-  // y is an Array
-  return x * y.length;
-}
-f(3, "hello", true) == 6
-```
-```js
-function f(x, y, z) {
-  return x + y + z;
-}
-// Pass each elem of array as argument
-f(...[1,2,3]) == 6
-```
-
-### Let + Const
-
-Block-scoped binding constructs. `let` is the new `var`. `const` is
-single-assignment. Static restrictions prevent use before assignment.
-
-
-```js
-function f() {
-  {
-    let x;
-    {
-      // okay, block scoped name
-      const x = "sneaky";
-      // error, const
-      x = "foo";
-    }
-    // error, already declared in block
-    let x = "inner";
-  }
-}
-```
-
-### Iterators + For..Of
-
-Iterator objects enable custom iteration like CLR IEnumerable or Java
-Iteratable. Generalize `for..in` to custom iterator-based iteration with
-`for..of`. Don’t require realizing an array, enabling lazy design patterns like
-LINQ.
-
-```js
-let fibonacci = {
-  [Symbol.iterator]() {
-    let pre = 0, cur = 1;
-    return {
-      next() {
-        [pre, cur] = [cur, pre + cur];
-        return { done: false, value: cur }
-      }
-    }
-  }
-}
-
-for (var n of fibonacci) {
-  // truncate the sequence at 1000
-  if (n > 1000)
-    break;
-  print(n);
-}
-```
-
-Iteration is based on these duck-typed interfaces (using
-[TypeScript](http://typescriptlang.org) type syntax for exposition only):
-
-```ts
-interface IteratorResult {
-  done: boolean;
-  value: any;
-}
-interface Iterator {
-  next(): IteratorResult;
-}
-interface Iterable {
-  [Symbol.iterator](): Iterator
-}
-```
-
-### Generators
-
-Generators simplify iterator-authoring using `function*` and `yield`. A function
-declared as function* returns a Generator instance. Generators are subtypes of
-iterators which include additional `next` and `throw`. These enable values to
-flow back into the generator, so `yield` is an expression form which returns a
-value (or throws).
-
-Note: Can also be used to enable ‘await’-like async programming, see also ES7
-`await` proposal.
-
-```js
-var fibonacci = {
-  [Symbol.iterator]: function*() {
-    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;
-  print(n);
-}
-```
-
-The generator interface is (using [TypeScript](http://typescriptlang.org) type
-syntax for exposition only):
-
-```ts
-interface Generator extends Iterator {
-    next(value?: any): IteratorResult;
-    throw(exception: any);
-}
-```
-
-### Comprehensions
-
-Array and generator comprehensions provide simple declarative list processing
-similar as used in many functional programming patterns.
-
-```js
-// Array comprehensions
-var results = [
-  for(c of customers)
-    if (c.city == "Seattle")
-      { name: c.name, age: c.age }
-]
-
-// Generator comprehensions
-var results = (
-  for(c of customers)
-    if (c.city == "Seattle")
-      { name: c.name, age: c.age }
-)
-```
-
-### Unicode
-
-Non-breaking additions to support full Unicode, including new unicode literal
-form in strings and new RegExp `u` mode to handle code points, as well as new
-APIs to process strings at the 21bit code points level.  These additions support
-building global apps in JavaScript.
-
-```js
-// same as ES5.1
-"𠮷".length == 2
-
-// new RegExp behaviour, opt-in ‘u’
-"𠮷".match(/./u)[0].length == 2
-
-// new form
-"\u{20BB7}"=="𠮷" == "\uD842\uDFB7"
-
-// new String ops
-"𠮷".codePointAt(0) == 0x20BB7
-
-// for-of iterates code points
-for(var c of "𠮷") {
-  console.log(c);
-}
-```
-
-### Modules
-
-Language-level support for modules for component definition. Codifies patterns
-from popular JavaScript module loaders (AMD, CommonJS). Runtime behaviour
-defined by a host-defined default loader. Implicitly async model – no code
-executes until requested modules are available and processed.
-
-```js
-// lib/math.js
-export function sum(x, y) {
-  return x + y;
-}
-export var pi = 3.141593;
-```
-```js
-// app.js
-module math from "lib/math";
-alert("2π = " + math.sum(math.pi, math.pi));
-```
-```js
-// otherApp.js
-import {sum, pi} from "lib/math";
-alert("2π = " + sum(pi, pi));
-```
-
-Some additional features include `export default` and `export *`:
-
-```js
-// lib/mathplusplus.js
-export * from "lib/math";
-export var e = 2.71828182846;
-export default function(x) {
-    return Math.exp(x);
-}
-```
-```js
-// app.js
-module math from "lib/mathplusplus";
-import exp from "lib/mathplusplus";
-alert("2π = " + exp(math.pi, math.e));
-```
-
-<blockquote class="to5-callout to5-callout-info">
-  <h4>Module Formatters</h4>
-  <p>
-    6to5 can transpile ES6 Modules to several different formats including
-    Common.js, AMD, System, and UMD. You can even create your own. For more
-    details see the <a href="modules.html">modules docs</a>.
-  </p>
-</blockquote>
-
-### Module Loaders
-
-Module loaders support:
-- Dynamic loading
-- State isolation
-- Global namespace isolation
-- Compilation hooks
-- Nested virtualization
-
-The default module loader can be configured, and new loaders can be constructed
-to evaluated and load code in isolated or constrained contexts.
-
-```js
-// Dynamic loading – ‘System’ is default loader
-System.import('lib/math').then(function(m) {
-  alert("2π = " + m.sum(m.pi, m.pi));
-});
-
-// Create execution sandboxes – new Loaders
-var loader = new Loader({
-  global: fixup(window) // replace ‘console.log’
-});
-loader.eval("console.log('hello world!');");
-
-// Directly manipulate module cache
-System.get('jquery');
-System.set('jquery', Module({$: $})); // WARNING: not yet finalized
-```
-
-<blockquote class="to5-callout to5-callout-warning">
-  <h4>Additional polyfill needed</h4>
-  <p>
-    Since 6to5 defaults to using common.js modules, it does not include the
-    polyfill for the module loader api. Get it
-    <a href="https://github.com/ModuleLoader/es6-module-loader">here</a>.
-  </p>
-</blockquote>
-
-<blockquote class="to5-callout to5-callout-info">
-  <h4>Using Module Loader</h4>
-  <p>
-    In order to use this, you'll need to tell 6to5 to use the
-    <code>system</code> module formatter. Also be sure to check out
-    <a href="https://github.com/systemjs/systemjs">System.js</a>
-  </p>
-</blockquote>
-
-
-### Map + Set + WeakMap + WeakSet
-
-Efficient data structures for common algorithms.  WeakMaps provides leak-free
-object-key’d side tables.
-
-```js
-// Sets
-var s = new Set();
-s.add("hello").add("goodbye").add("hello");
-s.size === 2;
-s.has("hello") === true;
-
-// Maps
-var m = new Map();
-m.set("hello", 42);
-m.set(s, 34);
-m.get(s) == 34;
-
-// Weak Maps
-var wm = new WeakMap();
-wm.set(s, { extra: 42 });
-wm.size === undefined
-
-// Weak Sets
-var ws = new WeakSet();
-ws.add({ data: 42 });
-// Because the added object has no other references, it will not be held in the set
-```
-
-<blockquote class="to5-callout to5-callout-info">
-  <h4>Support via polyfill</h4>
-  <p>
-    In order to support Promises you must include the 6to5 Polyfill.
-  </p>
-</blockquote>
-
-### Proxies
-
-Proxies enable creation of objects with the full range of behaviors available to
-host objects.  Can be used for interception, object virtualization,
-logging/profiling, etc.
-
-```js
-// Proxying a normal object
-var target = {};
-var handler = {
-  get: function (receiver, name) {
-    return `Hello, ${name}!`;
-  }
-};
-
-var p = new Proxy(target, handler);
-p.world === 'Hello, world!';
-```
-
-```js
-// Proxying a function object
-var target = function () { return 'I am the target'; };
-var handler = {
-  apply: function (receiver, ...args) {
-    return 'I am the proxy';
-  }
-};
-
-var p = new Proxy(target, handler);
-p() === 'I am the proxy';
-```
-
-There are traps available for all of the runtime-level meta-operations:
-
-```js
-var handler =
-{
-  get:...,
-  set:...,
-  has:...,
-  deleteProperty:...,
-  apply:...,
-  construct:...,
-  getOwnPropertyDescriptor:...,
-  defineProperty:...,
-  getPrototypeOf:...,
-  setPrototypeOf:...,
-  enumerate:...,
-  ownKeys:...,
-  preventExtensions:...,
-  isExtensible:...
-}
-```
-
-<blockquote class="to5-callout to5-callout-danger">
-  <h4>Unsupported feature</h4>
-  <p>
-    Due to the limitations of ES5, Proxies cannot be transpiled or polyfilled.
-    See support from various
-    <a href="http://kangax.github.io/compat-table/es6/#Proxy">JavaScript
-    engines</a>.
-  </p>
-</blockquote>
-
-### Symbols
-
-Symbols enable access control for object state. Symbols allow properties to be
-keyed by either `string` (as in ES5) or `symbol`. Symbols are a new primitive
-type. Optional `name` parameter used in debugging - but is not part of identity.
-Symbols are unique (like gensym), but not private since they are exposed via
-reflection features like `Object.getOwnPropertySymbols`.
-
-```js
-(function() {
-
-  // module scoped symbol
-  var key = Symbol("key");
-
-  function MyClass(privateData) {
-    this[key] = privateData;
-  }
-
-  MyClass.prototype = {
-    doStuff: function() {
-      ... this[key] ...
-    }
-  };
-
-})();
-
-var c = new MyClass("hello")
-c["key"] === undefined
-```
-
-<blockquote class="to5-callout to5-callout-info">
-  <h4>Support via polyfill</h4>
-  <p>
-    In order to support Promises you must include the 6to5 Polyfill.
-  </p>
-</blockquote>
-
-### Subclassable Built-ins
-In ES6, built-ins like `Array`, `Date` and DOM `Element`s can be subclassed.
-
-Object construction for a function named `Ctor` now uses two-phases (both
-virtually dispatched):
-
-- Call `Ctor[@@create]` to allocate the object, installing any special behavior
-- Invoke constructor on new instance to initialize
-
-The known `@@create` symbol is available via `Symbol.create`. Built-ins now
-expose their `@@create` explicitly.
-
-```js
-// Pseudo-code of Array
-class Array {
-    constructor(...args) { /* ... */ }
-    static [Symbol.create]() {
-        // Install special [[DefineOwnProperty]]
-        // to magically update 'length'
-    }
-}
-
-// User code of Array subclass
-class MyArray extends Array {
-    constructor(...args) { super(...args); }
-}
-
-// Two-phase 'new':
-// 1) Call @@create to allocate object
-// 2) Invoke constructor on new instance
-var arr = new MyArray();
-arr[1] = 12;
-arr.length == 2
-```
-
-### Math + Number + String + Object APIs
-
-Many new library additions, including core Math libraries, Array conversion
-helpers, and Object.assign for copying.
-
-```js
-Number.EPSILON
-Number.isInteger(Infinity) // false
-Number.isNaN("NaN") // false
-
-Math.acosh(3) // 1.762747174039086
-Math.hypot(3, 4) // 5
-Math.imul(Math.pow(2, 32) - 1, Math.pow(2, 32) - 2) // 2
-
-"abcde".contains("cd") // true
-"abc".repeat(3) // "abcabcabc"
-
-Array.from(document.querySelectorAll('*')) // Returns a real Array
-Array.of(1, 2, 3) // Similar to new Array(...), but without special one-arg behavior
-[0, 0, 0].fill(7, 1) // [0,7,7]
-[1,2,3].findIndex(x => x == 2) // 1
-["a", "b", "c"].entries() // iterator [0, "a"], [1,"b"], [2,"c"]
-["a", "b", "c"].keys() // iterator 0, 1, 2
-["a", "b", "c"].values() // iterator "a", "b", "c"
-
-Object.assign(Point, { origin: new Point(0,0) })
-```
-
-<blockquote class="to5-callout to5-callout-warning">
-  <h4>Limited support from polyfill</h4>
-  <p>
-    Most of these APIs are supported by the 6to5 Polyfill. However, certain
-    features are omitted for various reasons (ie.
-    <code>String.prototype.normalize</code> needs a lot of additional code to
-    support). You can find more polyfills
-    <a href="https://github.com/addyosmani/es6-tools#polyfills">here</a>.
-  </p>
-</blockquote>
-
-### Binary and Octal Literals
-Two new numeric literal forms are added for binary (`b`) and octal (`o`).
-
-```js
-0b111110111 === 503 // true
-0o767 === 503 // true
-```
-
-<blockquote class="to5-callout to5-callout-warning">
-  <h4>Only supports literal form</h4>
-  <p>
-    6to5 is only able to transform <code>0o767</code> and not
-    <code>Number('0o767')</code>.
-  </p>
-</blockquote>
-
-
-### Promises
-
-Promises are a library for asynchronous programming. Promises are a first class
-representation of a value that may be made available in the future. Promises are
-used in many existing JavaScript libraries.
-
-```js
-function timeout(duration = 0) {
-    return new Promise((resolve, reject) => {
-        setTimeout(resolve, duration);
-    })
-}
-
-var p = timeout(1000).then(() => {
-    return timeout(2000);
-}).then(() => {
-    throw new Error("hmm");
-}).catch(err => {
-    return Promise.all([timeout(100), timeout(200)]);
-})
-```
-
-<blockquote class="to5-callout to5-callout-info">
-  <h4>Support via polyfill</h4>
-  <p>
-    In order to support Promises you must include the 6to5 Polyfill.
-  </p>
-</blockquote>
-
-### Reflect API
-
-Full reflection API exposing the runtime-level meta-operations on objects. This
-is effectively the inverse of the Proxy API, and allows making calls
-corresponding to the same meta-operations as the proxy traps. Especially useful
-for implementing proxies.
-
-```js
-// No sample yet
-```
-
-<blockquote class="to5-callout to5-callout-danger">
-  <h4>Limited support from polyfill</h4>
-  <p>
-    Core.js only currently supports <code>Reflect.ownKeys</code>, if you would
-    like a much more complete Reflect API, include another polyfill such as
-    <a href="https://github.com/tvcutsem/harmony-reflect">Harmony Reflect</a>.
-  </p>
-</blockquote>
-
-### Tail Calls
-
-Calls in tail-position are guaranteed to not grow the stack unboundedly. Makes
-recursive algorithms safe in the face of unbounded inputs.
-
-```js
-function factorial(n, acc = 1) {
-    'use strict';
-    if (n <= 1) return acc;
-    return factorial(n - 1, n * acc);
-}
-
-// Stack overflow in most implementations today,
-// but safe on arbitrary inputs in eS6
-factorial(100000)
-```
-
-<blockquote class="to5-callout to5-callout-danger">
-  <h4>Unsupported feature</h4>
-  <p>
-    Due to high complexity of transpiling Tail Calls, 6to5 does not currently
-    have them implemented. See
-    <a href="https://github.com/6to5/6to5/issues/256">#256</a>.
-  </p>
-</blockquote>

doc/usage/api.md

@@ -1,59 +0,0 @@
----
-layout: docs
-title: API
-description: How to use the Node.js API.
-permalink: /docs/usage/api/
----
-
-
-```javascript
-var to5 = require('6to5');
-```
-
-## to5.transform
-
-Transforms the passed in `code`.
-
-```
-to5.transform(code, [options])
-```
-
-**Example**
-
-```js
-var result = to5.transform('code();', options);
-result.code;
-result.map;
-result.ast;
-```
-
-## to5.transformFile
-
-Asynchronously transforms the entire contents of a file.
-
-```js
-to5.transformFile(filename, [options], callback)
-```
-
-**Example**
-
-```js
-to5.transformFile('filename.js', options, function (err, result) {
-  result.code;
-});
-```
-
-## to5.transformFileSync
-
-Synchronous version of `to5.transformFile`. Returns the transformed contents of
-the `filename`.
-
-```js
-to5.transformFileSync(filename, [options])
-```
-
-**Example**
-
-```js
-to5.transformFileSync('filename.js', options).code;
-```

doc/usage/browser.md

@@ -1,59 +0,0 @@
----
-layout: docs
-title: Browser
-description: How to transpile in the browser.
-permalink: /docs/usage/browser/
-redirect_from: /browser.html
----
-
-<p class="lead">
-  A browser version of 6to5 is available from `browser.js` inside the 6to5
-  directory in an npm release.
-</p>
-
-<blockquote class="to5-callout to5-callout-warning">
-  <h4>Not intended for serious use</h4>
-  <p>
-    Compiling in the browser has a fairly limited use case, so if you are
-    working on a production site you should be precompiling your scripts
-    server-side. See <a href="../setup/#build-systems">setup build systems</a>
-    for more information.
-  </p>
-</blockquote>
-
-## Script tags
-
-When the `browser.js` file is included all scripts with the type
-`text/ecmascript-6` and `text/6to5` are automatically compiled and ran.
-
-```html
-<script src="node_modules/6to5/browser.js"></script>
-<script type="text/6to5">
-class Test {
-  test() {
-    return 'test';
-  }
-}
-
-var test = new Test;
-test.test(); // "test"
-</script>
-```
-
-## API
-
-Programmatically transpile and execute strings of ES6 code.
-
-See [options](#options) for additional documentation.
-
-### `to5.transform(code, [opts])`
-
-```js
-to5.transform('class Test {}').code;
-```
-
-### `to5.run(code, [opts])`
-
-````js
-to5.run('class Test {}');
-````

doc/usage/cli.md

@@ -1,99 +0,0 @@
----
-layout: docs
-title: CLI
-description: How to use the CLI tools.
-permalink: /docs/usage/cli/
-redirect_from: /usage.html
----
-
-<p class="lead">
-  6to5 comes with a built-in CLI which can be used to compile files from the
-  command line.
-</p>
-
-## Install
-
-Using [npm](https://www.npmjs.com/) you can install 6to5 globally, making it
-available from the command line.
-
-```sh
-$ npm install --global 6to5
-```
-
-## 6to5
-
-#### Compile Files
-
-Compile the file `script.js` and **output to stdout**.
-
-```sh
-$ 6to5 script.js
-# output...
-```
-
-If you would like to **output to a file** you may use `--out-file` or `-o`.
-
-```sh
-$ 6to5 script.js --out-file script-compiled.js
-```
-
-### Compile with Source Maps
-
-If you would then like to add a **source map file** you can use
-`--source-maps` or `-s`. [Learn more about source maps](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/).
-
-```sh
-$ 6to5 script.js --out-file script-compiled.js --source-maps
-```
-
-If you would rather have **inline source maps**, you may use
-`--source-maps-inline` or `-t`.
-
-```sh
-$ 6to5 script.js --out-file script-compiled.js --source-maps-inline
-```
-
-### Compile Directories
-
-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
-```
-
-### Piping Files
-
-Pipe a file in via stdin and output it to `script-compiled.js`
-
-```sh
-$ 6to5 --out-file script-compiled.js < script.js
-```
-
-## 6to5-node
-
-6to5 comes with a second CLI which works exactly the same as Node.js's CLI, only
-it will compile ES6 code before running it.
-
-Launch a REPL (Read-Eval-Print-Loop).
-
-```sh
-$ 6to5-node
-```
-
-Evaluate code.
-
-```sh
-$ 6to5-node -e "class Test { }"
-```
-
-Compile and run `test.js`.
-
-```sh
-$ 6to5-node test
-```

doc/usage/experimental.md

@@ -1,28 +0,0 @@
----
-layout: docs
-title: Experimental
-description: How to use experimental ES7 features.
-permalink: /docs/usage/experimental/
-redirect_from: /experimental.html
----
-
-> 6to5 also has experimental support for ES7 proposals.
-
-<blockquote class="to5-callout to5-callout-danger">
-  <h4>Subject to change</h4>
-  <p>
-    These proposals are subject to change so <strong><em>use with extreme
-    caution</em></strong>. 6to5 may update without warning in order to track spec
-    changes. Please do not use them in production applications.
-  </p>
-</blockquote>
-
-#### Usage
-
-```js
-$ 6to5 --experimental
-```
-
-```js
-to5.transform('code', { experimental: true });
-```

doc/usage/jsx.md

@@ -1,22 +0,0 @@
----
-layout: docs
-title: JSX
-description: How to use JSX.
-permalink: /docs/usage/jsx/
----
-
-<p class="lead">
-  6to5 has built-in support for React v0.12. Tags are automatically transformed
-  to their equivalent <code>React.createElement(...)</code> and
-  <code>displayName</code> is automatically inferred and added to all
-  <code>React.createClass</code> calls.
-</p>
-
-## Blacklist
-
-To disable this behaviour add react to your blacklist:
-
-````js
-to5.transform("code", { blacklist: ["react"] });
-$ 6to5 --blacklist react
-```

doc/usage/modules.md

@@ -1,260 +0,0 @@
----
-layout: docs
-title: Modules
-description: How to use module formatters.
-permalink: /docs/usage/modules/
-redirect_from: /modules.html
----
-
-<p class="lead">
-  6to5 has the ability to transpile ES6 modules to the module system of your
-  choice. You can even easily create your own.
-</p>
-
-## Usage
-
-```sh
-$ 6to5 --modules common script.js
-```
-
-```js
-to5.transform('import "foo";', { modules: "common" });
-```
-
-## Formats
-
-### Common (Default)
-
-**Usage**
-
-```sh
-$ 6to5 --modules common
-```
-
-**Example**
-
-```js
-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";
-```
-
-```js
-"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
-
-**Usage**
-
-```sh
-$ 6to5 --modules amd
-```
-
-**Example**
-
-```js
-import foo from "foo";
-
-export function bar() {
-  return foo("foobar");
-}
-```
-
-```js
-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):
-
-```js
-define("filename", ["exports", "foo"], function (exports, _foo) {})
-```
-
-### System
-
-**Usage**
-
-```sh
-$ 6to5 --modules system
-```
-
-**Example**
-
-```js
-import foo from "foo";
-
-export function bar() {
-  return foo("foobar");
-}
-```
-
-```js
-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);
-    }
-  };
-});
-```
-
-### UMD
-
-**Usage**
-
-```sh
-$ 6to5 --modules umd
-```
-
-**Example**
-
-```js
-import foo from "foo";
-
-export function bar() {
-  return foo("foobar");
-}
-```
-
-```js
-(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
-
-**Usage**
-
-```sh
-$ 6to5 --modules ignore
-```
-
-**Example**
-
-```js
-import foo from "foo";
-
-export function bar() {
-  return foo("foobar");
-}
-```
-
-```js
-function bar() {
-  return foo("foobar");
-}
-```
-
-### Custom
-
-You can alternatively specify module names instead of one of the built-in types.
-
-**Usage**
-
-```js
-$ 6to5 --modules custom-module-formatter
-```
-
-**Example**
-
-**`node_modules/custom-module-formatter/index.js`**
-
-```js
-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/usage/options.md

@@ -1,35 +0,0 @@
----
-layout: docs
-title: Options
-description: Options for 6to5 transpiling.
-permalink: /docs/usage/options/
----
-
-## Usage
-
-```js
-to5.transform(code, options);
-```
-
-```sh
-$ 6to5 --name=value
-```
-
-## Options
-
-| Option             | Default              | Description                     |
-| ------------------ | -------------------- | ------------------------------- |
-| `filename`         | `"unknown"`          | Filename for use in errors etc. |
-| `fileNameRelative` | `(filename)`         | Filename relative to `sourceRoot`. |
-| `blacklist`        | `[]`                 | Array of transformers to **exclude**. Run `6to5 --help` to see a full list of transformers. |
-| `whitelist`        | `[]`                 | Array of transformers to **only** use. Run `6to5 --help` to see a full list of transformers. |
-| `modules`          | `"common"`           | Which module formatter to use. Run `6to5 --help` to see a full list of module formatters. |
-| `sourceMap`        | `false`              | 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. |
-| `sourceMapName`    | `(filenameRelative)` | Set `file` on returned source map. |
-| `sourceFileName`   | `(filenameRelative)` | Set `sources[0]` on returned source map. |
-| `sourceRoot`       | `(moduleRoot)`       | The root from which all sources are relative. |
-| `moduleRoot`       | `(sourceRoot)`       | Optional prefix for the AMD module formatter that will be prepend to the filename on module definitions. |
-| `amdModuleIds`     | `false`              | If truthy, insert an explicit id for each defined AMD module. By default, AMD modules are anonymous. |
-| `runtime`          | `false`              | Optionally replace all 6to5 helper declarations with a referenece to this variable. If set to `true` then the default namespace is used `to5Runtime`. |
-| `comments`         | `true`               | Output comments in generated output. |
-| `experimental`     | `false`              | Enable support for experimental ES7 features. |

doc/usage/playground.md

@@ -1,173 +0,0 @@
----
-layout: docs
-title: Playground
-description: How to use the playground.
-permalink: /docs/usage/playground/
-redirect_from: /playground.html
----
-
-> Playground is a proving ground for language ideas.
-
-<blockquote class="to5-callout to5-callout-danger">
-  <h4>Unofficial</h4>
-  <p>
-    These features are in no way endorsed by Ecma International and are not a
-    part of any ECMAScript standard, nor are they necessarily on track to become
-    part of any standard. <strong><em>Use with extreme caution</em></strong>.
-  </p>
-</blockquote>
-
-<blockquote class="to5-callout to5-callout-info">
-  <h4>Proposal Authors</h4>
-  <p>
-    If you are actively working on an
-    <a href="https://github.com/tc39/ecma262">ECMAScript proposal</a>, this is a
-    good place to get your ideas implemented with so that they may be tested
-    with all of the latest language and API features.
-  </p>
-  <p>
-    Please feel free to <a href="https://github.com/6to5/6to5/issues/new">open
-    an issue</a> on the 6to5 repository with your WIP spec, and we can discuss
-    getting it implemented. Be sure to include as much information as possible.
-  </p>
-</blockquote>
-
-## Usage
-
-```js
-$ 6to5 --playground
-```
-
-```js
-to5.transform('code', { playground: true });
-```
-
-<blockquote class="to5-callout to5-callout-info">
-  <h4>Enables experimental</h4>
-  <p>
-    Enabling playground also enables experimental support.
-  </p>
-</blockquote>
-
-## Features
-
-### 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.
-
-**Uses**
-
-```js
-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
-```
-
-**Example**
-
-```js
-var obj = {};
-obj.x ?= 2;
-```
-
-is equivalent to
-
-```js
-var obj = {};
-if (!Object.prototype.hasOwnProperty.call(obj, 'x')) obj.x = 2;
-```
-
-### Method binding
-
-```javascript
-var fn = obj#method;
-var fn = obj#method("foob");
-```
-
-is 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
-
-```js
-var foo = {
-  memo bar() {
-    return complex();
-  }
-};
-
-class Foo {
-  memo bar() {
-    return complex();
-  }
-}
-```
-
-is equivalent to
-
-```js
-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
-
-```js
-@foo
-```
-
-is equivalent to
-
-```
-this.foo
-```

doc/usage/polyfill.md

@@ -1,56 +0,0 @@
----
-layout: docs
-title: Polyfill
-description: How to use the Polyfill.
-permalink: /docs/usage/polyfill/
----
-
-<p class="lead">
-  6to5 includes a polyfill that includes a custom
-  <a href="https://github.com/facebook/regenerator/blob/master/runtime.js">regenerator runtime</a>
-  and <a href="https://github.com/zloirock/core-js">core.js</a>.
-</p>
-
-This will emulate a full ES6 environment. This polyfill is automatically loaded
-when using `6to5-node` and `6to5/register`.
-
-## Usage in Node/Browserify
-
-You need to include the polyfill require at the top the **entry point** to
-your application.
-
-```js
-require('6to5/polyfill');
-```
-
-Fortunately, this is automatically loaded when using:
-
-```js
-require('6to5/register');
-```
-
-## Usage in 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`.
-
-<blockquote class="to5-callout to5-callout-warning">
-<h4>Polyfills are not perfect</h4>
-<p>
-Due to limitations in various ES5 environments not every polyfill will work
-in every environment.
-</p>
-</blockquote>
-
-<blockquote class="to5-callout to5-callout-warning">
-<h4>Certain polyfills not included</h4>
-<p>
-Certain polyfills are too large/complex for their implemented features to
-justify including them for all builds. You may have to include additional
-polyfills for a subset of ES6 features.
-</p>
-</blockquote>

doc/usage/require.md

@@ -1,55 +0,0 @@
----
-layout: docs
-title: Require Hook
-description: How to use the require hook.
-permalink: /docs/usage/require/
----
-
-## Install
-
-```sh
-$ npm install 6to5
-```
-
-## Usage
-
-```js
-require('6to5/register');
-```
-
-All subsequent files required by node with the extensions `.es6`, `.es`, and
-`.js` will be transformed by 6to5. The polyfill specified in Polyfill is also
-required.
-
-**NOTE:** By default all requires to `node_modules` will be ignored. You can
-override this by passing an ignore regex via:
-
-```js
-require('6to5/register')({
-  // This will override `node_modules` ignoring - you can alternatively pass
-  // a regex
-  ignore: false
-});
-```
-
-## Register 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']
-});
-```

doc/usage/runtime.md

@@ -1,56 +0,0 @@
----
-layout: docs
-title: Optional Runtime
-description: How to use the optional runtime.
-permalink: /docs/usage/runtime/
----
-
-## Details
-
-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.
-
-## Usage
-
-```js
-$ 6to5 --runtime
-```
-
-```js
-to5.transform('code', { runtime: true });
-```
-
-### Getting the runtime
-
-```sh
-$ 6to5-runtime
-```
-
-or
-
-```js
-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:
-
-```sh
-$ 6to5-runtime myCustomNamespace
-```
-
-```js
-require("6to5").runtime('myCustomNamespace');
-```
-
-See [Options - runtime](../options) for documentation on changing the reference in
-generated code.

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

@@ -35,7 +35,8 @@ File.helpers = [
   "async-to-generator",
   "interop-require-wildcard",
   "typeof",
-  "exports-wildcard"
+  "extends",
+  "get"
 ];
 
 File.excludeHelpersFromRuntime = [
@@ -48,6 +49,7 @@ File.normaliseOptions = function (opts) {
 
   _.defaults(opts, {
     experimental: false,
+    reactCompat:  false,
     playground:   false,
     whitespace:   true,
     moduleIds:    opts.amdModuleIds || false,

lib/6to5/generation/buffer.js

@@ -61,7 +61,7 @@ Buffer.prototype.space = function () {
 Buffer.prototype.removeLast = function (cha) {
   if (!this.isLast(cha)) return;
 
-  this.buf = this.buf.slice(0, -1);
+  this.buf = this.buf.substr(0, this.buf.length - 1);
   this.position.unshift(cha);
 };
 
@@ -77,10 +77,9 @@ Buffer.prototype.newline = function (i, removeLast) {
     if (this.endsWith("{\n")) i--;
     if (this.endsWith(util.repeat(i, "\n"))) return;
 
-    var self = this;
-    _.times(i, function () {
-      self.newline(null, removeLast);
-    });
+    for (var j = 0; j < i; j++) {
+      this.newline(null, removeLast);
+    }
     return;
   }
 
@@ -115,13 +114,18 @@ Buffer.prototype._push = function (str) {
 };
 
 Buffer.prototype.endsWith = function (str) {
-  return this.buf.slice(-str.length) === str;
+  var d = this.buf.length - str.length;
+  return d >= 0 && this.buf.lastIndexOf(str) === d;
 };
 
 Buffer.prototype.isLast = function (cha, trimRight) {
   var buf = this.buf;
   if (trimRight) buf = util.trimRight(buf);
+  var last = buf[buf.length - 1];
 
-  var chars = [].concat(cha);
-  return _.contains(chars, _.last(buf));
+  if (Array.isArray(cha)) {
+    return _.contains(cha, last);
+  } else {
+    return cha === last;
+  }
 };

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

@@ -57,8 +57,28 @@ exports.ThisExpression = function () {
 
 exports.CallExpression = function (node, print) {
   print(node.callee);
+
   this.push("(");
-  print.join(node.arguments, { separator: ", " });
+
+  var separator = ",";
+
+  if (node._prettyCall) {
+    separator += "\n";
+    this.newline();
+    this.indent();
+  } else {
+    separator += " ";
+  }
+
+  print.join(node.arguments, {
+    separator: separator
+  });
+
+  if (node._prettyCall) {
+    this.newline();
+    this.dedent();
+  }
+
   this.push(")");
 };
 

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

@@ -1,4 +1,5 @@
-var t = require("../../types");
+var util = require("../../util");
+var t    = require("../../types");
 
 exports.WithStatement = function (node, print) {
   this.keyword("with");
@@ -157,7 +158,24 @@ exports.DebuggerStatement = function () {
 exports.VariableDeclaration = function (node, print, parent) {
   this.push(node.kind + " ");
 
-  print.join(node.declarations, { separator: ", " });
+  var inits = 0;
+  var noInits = 0;
+  for (var i in node.declarations) {
+    if (node.declarations[i].init) {
+      inits++;
+    } else {
+      noInits++;
+    }
+  }
+
+  var sep = ",";
+  if (inits > noInits) { // more inits than noinits
+    sep += "\n" + util.repeat(node.kind.length + 1);
+  } else {
+    sep += " ";
+  }
+
+  print.join(node.declarations, { separator: sep });
 
   if (!t.isFor(parent)) {
     this.semicolon();

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

@@ -6,14 +6,19 @@ var t          = require("../../types");
 var _          = require("lodash");
 
 var find = function (obj, node, parent) {
+  if (!obj) return;
   var result;
 
-  _.each(obj, function (fn, type) {
+  var types = Object.keys(obj);
+  for (var i = 0; i < types.length; i++) {
+    var type = types[i];
+
     if (t["is" + type](node)) {
+      var fn = obj[type];
       result = fn(node, parent);
-      if (result != null) return false;
+      if (result != null) break;
     }
-  });
+  }
 
   return result;
 };
@@ -99,7 +104,13 @@ _.each(Node.prototype, function (fn, key) {
   Node[key] = function (node, parent) {
     var n = new Node(node, parent);
 
-    var args = _.toArray(arguments).slice(2);
+    // Avoid leaking arguments to prevent deoptimization
+    var skipCount = 2;
+    var args = new Array(arguments.length - skipCount);
+    for (var i = 0; i < args.length; i++) {
+      args[i] = arguments[i + 2];
+    }
+
     return n[key].apply(n, args);
   };
 });

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

@@ -21,6 +21,13 @@ _.each([
   });
 });
 
+exports.UpdateExpression = function (node, parent) {
+  if (t.isMemberExpression(parent) && parent.object === node) {
+    // (foo++).test()
+    return true;
+  }
+};
+
 exports.ObjectExpression = function (node, parent) {
   if (t.isExpressionStatement(parent)) {
     // ({ foo: "bar" });

lib/6to5/generation/position.js

@@ -1,33 +1,27 @@
 module.exports = Position;
 
-var _ = require("lodash");
-
 function Position() {
   this.line = 1;
   this.column = 0;
 }
 
 Position.prototype.push = function (str) {
-  var self = this;
-
-  _.each(str, function (cha) {
-    if (cha === "\n") {
-      self.line++;
-      self.column = 0;
+  for (var i = 0; i < str.length; i++) {
+    if (str[i] === "\n") {
+      this.line++;
+      this.column = 0;
     } else {
-      self.column++;
+      this.column++;
     }
-  });
+  }
 };
 
 Position.prototype.unshift = function (str) {
-  var self = this;
-
-  _.each(str, function (cha) {
-    if (cha === "\n") {
-      self.line--;
+  for (var i = 0; i < str.length; i++) {
+    if (str[i] === "\n") {
+      this.line--;
     } else {
-      self.column--;
+      this.column--;
     }
-  });
+  }
 };

lib/6to5/generation/whitespace.js

@@ -11,15 +11,18 @@ Whitespace.prototype.getNewlinesBefore = function (node) {
   var startToken;
   var endToken;
   var tokens = this.tokens;
+  var token;
+
+  for (var i = 0; i < tokens.length; i++) {
+    token = tokens[i];
 
-  _.each(tokens, function (token, i) {
     // this is the token this node starts with
     if (node.start === token.start) {
       startToken = tokens[i - 1];
       endToken = token;
-      return false;
+      break;
     }
-  });
+  }
 
   return this.getNewlinesBetween(startToken, endToken);
 };
@@ -28,15 +31,18 @@ Whitespace.prototype.getNewlinesAfter = function (node) {
   var startToken;
   var endToken;
   var tokens = this.tokens;
+  var token;
+
+  for (var i = 0; i < tokens.length; i++) {
+    token = tokens[i];
 
-  _.each(tokens, function (token, i) {
     // this is the token this node ends with
     if (node.end === token.end) {
       startToken = token;
       endToken = tokens[i + 1];
-      return false;
+      break;
     }
-  });
+  }
 
   if (endToken.type.type === "eof") {
     return 1;

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/runtime-generator.js

@@ -20,7 +20,7 @@ module.exports = function (namespace) {
 
   _.each(File.helpers, function (name) {
     if (_.contains(File.excludeHelpersFromRuntime, name)) {
-      return false;
+      return;
     }
 
     var key = t.identifier(t.toIdentifier(name));

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(
     "=",
@@ -110,6 +161,9 @@ DefaultFormatter.prototype.getModuleName = function () {
 
   moduleName += filenameRelative;
 
+  // normalise path separators
+  moduleName = moduleName.replace(/\\/g, "/");
+
   return moduleName;
 };
 
@@ -142,10 +196,11 @@ DefaultFormatter.prototype._exportSpecifier = function (getRef, specifier, node,
       nodes.push(this._exportsWildcard(getRef(), node));
     } else {
       var ref;
-      if (t.isSpecifierDefault(specifier.id) || this.noInteropRequire) {
-        ref = t.memberExpression(getRef(), specifier.id);
-      } else {
+      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";
@@ -162,7 +217,8 @@ DefaultFormatter.prototype._exportSpecifier = function (getRef, specifier, node,
 };
 
 DefaultFormatter.prototype._exportsWildcard = function (objectIdentifier) {
-  return t.expressionStatement(t.callExpression(this.file.addHelper("exports-wildcard"), [
+  return t.expressionStatement(t.callExpression(this.file.addHelper("defaults"), [
+    t.identifier("exports"),
     t.callExpression(this.file.addHelper("interop-require-wildcard"), [objectIdentifier])
   ]));
 };

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

@@ -0,0 +1,12 @@
+var util = require("../../util");
+
+module.exports = function (Parent) {
+  var Constructor = function () {
+    this.noInteropExport = true;
+    Parent.apply(this, arguments);
+  };
+
+  util.inherits(Constructor, Parent);
+
+  return Constructor;
+};

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

@@ -0,0 +1 @@
+module.exports = require("./_strict")(require("./amd"));

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

@@ -1,13 +1,14 @@
 module.exports = AMDFormatter;
 
 var DefaultFormatter = require("./_default");
+var CommonFormatter  = require("./common");
 var util             = require("../../util");
 var t                = require("../../types");
 var _                = require("lodash");
 
 function AMDFormatter() {
-  DefaultFormatter.apply(this, arguments);
-  this.ids  = {};
+  CommonFormatter.apply(this, arguments);
+  this.ids = {};
 }
 
 util.inherits(AMDFormatter, DefaultFormatter);
@@ -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.noInteropExport) {
+    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-strict.js

@@ -0,0 +1 @@
+module.exports = require("./_strict")(require("./common"));

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

@@ -61,7 +61,7 @@ CommonJSFormatter.prototype.importDeclaration = function (node, nodes) {
 };
 
 CommonJSFormatter.prototype.exportDeclaration = function (node, nodes) {
-  if (node.default) {
+  if (node.default && !this.noInteropRequire && !this.noInteropExport) {
     var declar = node.declaration;
     var assign;
 
@@ -83,10 +83,12 @@ CommonJSFormatter.prototype.exportDeclaration = function (node, nodes) {
       // this export isn't a function so we can't hoist it to the top so we need to set it
       // at the very end of the file with something like:
       //
-      //   module.exports = Object.assign(exports["default"], exports)
+      //   module.exports = _extends(exports["default"], exports)
       //
 
-      assign = util.template("common-export-default-assign", true);
+      assign = util.template("common-export-default-assign", {
+        EXTENDS_HELPER: this.file.addHelper("extends")
+      }, true);
       assign._blockHoist = 0;
 
       nodes.push(assign);

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

@@ -0,0 +1 @@
+module.exports = require("./_strict")(require("./umd"));

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

@@ -25,22 +25,36 @@ 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)];
+
+  var testExports = util.template("test-exports");
+  var testModule = util.template("test-module");
+  var 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/class-super-constructor-call-fast.js

@@ -0,0 +1,5 @@
+(function () {
+  if (SUPER_NAME != null) {
+    SUPER_NAME.apply(this, arguments);
+  }
+});

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

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

lib/6to5/transformation/templates/common-export-default-assign.js

@@ -1 +1 @@
-module.exports = Object.assign(exports["default"], exports);
+module.exports = EXTENDS_HELPER(exports["default"], exports);

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

@@ -1,7 +0,0 @@
-(function (obj) {
-  for (var i in obj) {
-    if (exports[i] !== undefined) {
-      exports[i] = obj[i];
-    }
-  }
-})

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

@@ -0,0 +1,9 @@
+(function (target) {
+  for (var i = 1; i < arguments.length; i++) {
+    var source = arguments[i];
+    for (var key in source) {
+      target[key] = source[key];
+    }
+  }
+  return target;
+})

lib/6to5/transformation/templates/for-of-fast.js

@@ -0,0 +1,13 @@
+for (var LOOP_OBJECT = OBJECT,
+         IS_ARRAY = Array.isArray(LOOP_OBJECT),
+         INDEX = 0,
+         LOOP_OBJECT = IS_ARRAY ? LOOP_OBJECT : LOOP_OBJECT[Symbol.iterator]();;) {
+  if (IS_ARRAY) {
+    if (INDEX >= LOOP_OBJECT.length) break;
+    ID = LOOP_OBJECT[INDEX++];
+  } else {
+    INDEX = LOOP_OBJECT.next();
+    if (INDEX.done) break;
+    ID = INDEX.value;
+  }
+}

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

@@ -0,0 +1,23 @@
+(function get(object, property, receiver) {
+  var desc = Object.getOwnPropertyDescriptor(object, property);
+
+  if (desc === undefined) {
+    var parent = Object.getPrototypeOf(object);
+
+    if (parent === null) {
+      return undefined;
+    } else {
+      return get(parent, property, receiver);
+    }
+  } else if ("value" in desc && desc.writable) {
+    return desc.value;
+  } else {
+    var getter = desc.get;
+
+    if (getter === undefined) {
+      return undefined;
+    }
+
+    return getter.call(receiver);
+  }
+});

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

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

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

@@ -1 +0,0 @@
-Object.defineProperties(OBJECT, PROPS);

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

@@ -0,0 +1 @@
+typeof exports !== "undefined"

lib/6to5/transformation/templates/test-module.js

@@ -0,0 +1 @@
+typeof module !== "undefined"

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

@@ -31,17 +31,19 @@ transform._ensureTransformerNames = function (type, keys) {
 transform.transformers = {};
 
 transform.moduleFormatters = {
-  common: require("./modules/common"),
-  system: require("./modules/system"),
-  ignore: require("./modules/ignore"),
-  amd:    require("./modules/amd"),
-  umd:    require("./modules/umd")
+  commonStrict: require("./modules/common-strict"),
+  umdStrict:    require("./modules/umd-strict"),
+  amdStrict:    require("./modules/amd-strict"),
+  common:       require("./modules/common"),
+  system:       require("./modules/system"),
+  ignore:       require("./modules/ignore"),
+  amd:          require("./modules/amd"),
+  umd:          require("./modules/umd")
 };
 
 _.each({
-  // spec
-  specBlockHoistFunctions:   require("./transformers/spec-block-hoist-functions"),
   specNoForInOfAssignment:   require("./transformers/spec-no-for-in-of-assignment"),
+  specSetters:               require("./transformers/spec-setters"),
 
   // playground
   methodBinding:             require("./transformers/playground-method-binding"),
@@ -57,17 +59,18 @@ _.each({
   arrayComprehension:        require("./transformers/es7-array-comprehension"),
   generatorComprehension:    require("./transformers/es7-generator-comprehension"),
   arrowFunctions:            require("./transformers/es6-arrow-functions"),
+  classesFastSuper:          require("./transformers/optional-classes-fast-super"),
   classes:                   require("./transformers/es6-classes"),
 
-  computedPropertyNames:     require("./transformers/es6-computed-property-names"),
-
   objectSpread:              require("./transformers/es7-object-spread"),
   exponentiationOperator:    require("./transformers/es7-exponentiation-operator"),
   spread:                    require("./transformers/es6-spread"),
   templateLiterals:          require("./transformers/es6-template-literals"),
   propertyMethodAssignment:  require("./transformers/es6-property-method-assignment"),
+  computedPropertyNames:     require("./transformers/es6-computed-property-names"),
   destructuring:             require("./transformers/es6-destructuring"),
   defaultParameters:         require("./transformers/es6-default-parameters"),
+  forOfFast:                 require("./transformers/optional-for-of-fast"),
   forOf:                     require("./transformers/es6-for-of"),
   unicodeRegex:              require("./transformers/es6-unicode-regex"),
   abstractReferences:        require("./transformers/es7-abstract-references"),

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

@@ -3,36 +3,11 @@ var util     = require("../../util");
 var t        = require("../../types");
 
 exports.ClassDeclaration = function (node, parent, file, scope) {
-  var closure = true;
-  if (t.isProgram(parent) || t.isBlockStatement(parent)) {
-    closure = false;
-  }
-
-  var factory = new Class(node, file, scope, closure);
-  var newNode = factory.run();
-  if (factory.closure) {
-    if (closure) {
-      // declaration in an expression context...
-      // export default class Foo {}
-      scope.push({
-        kind: "var",
-        key: node.id.key,
-        id: node.id
-      });
-      return t.assignmentExpression("=", node.id, newNode);
-    } else {
-      // has a super class or PrivateDeclaration etc
-      return t.variableDeclaration("let", [
-        t.variableDeclarator(node.id, newNode)
-      ]);
-    }
-  } else {
-    return newNode;
-  }
+  return new Class(node, file, scope, true).run();
 };
 
 exports.ClassExpression = function (node, parent, file, scope) {
-  return new Class(node, file, scope, true).run();
+  return new Class(node, file, scope, false).run();
 };
 
 /**
@@ -44,11 +19,11 @@ exports.ClassExpression = function (node, parent, file, scope) {
  * @param {Boolean} closure
  */
 
-function Class(node, file, scope, closure) {
-  this.closure = closure;
-  this.scope   = scope;
-  this.node    = node;
-  this.file    = file;
+function Class(node, file, scope, isStatement) {
+  this.isStatement = isStatement;
+  this.scope       = scope;
+  this.node        = node;
+  this.file        = file;
 
   this.hasInstanceMutators = false;
   this.hasStaticMutators   = false;
@@ -83,17 +58,20 @@ Class.prototype.run = function () {
     t.variableDeclarator(className, constructor)
   ]));
 
+  var closureArgs = [];
+  var closureParams = [];
+
   //
 
   if (superName) {
-    this.closure = true;
+    closureArgs.push(superName);
 
-    // so we're only evaluating it once
-    var superRef = this.scope.generateUidBasedOnNode(superName, this.file);
-    body.unshift(t.variableDeclaration("var", [
-      t.variableDeclarator(superRef, superName)
-    ]));
-    superName = superRef;
+    if (!t.isIdentifier(superName)) {
+      var superRef = this.scope.generateUidBasedOnNode(superName, this.file);
+      superName = superRef;
+    }
+
+    closureParams.push(superName);
 
     this.superName = superName;
     body.push(t.expressionStatement(t.callExpression(file.addHelper("inherits"), [className, superName])));
@@ -103,19 +81,25 @@ Class.prototype.run = function () {
 
   t.inheritsComments(body[0], this.node);
 
-  if (this.closure) {
-    if (body.length === 1) {
-      // only a constructor so no need for a closure container
-      return constructor;
-    } else {
-      body.push(t.returnStatement(className));
-      return t.callExpression(
-        t.functionExpression(null, [], t.blockStatement(body)),
-        []
-      );
-    }
+  var init;
+
+  if (body.length === 1) {
+    // only a constructor so no need for a closure container
+    init = constructor;
   } else {
-    return body;
+    body.push(t.returnStatement(className));
+    init = t.callExpression(
+      t.functionExpression(null, closureParams, t.blockStatement(body)),
+      closureArgs
+    );
+  }
+
+  if (this.isStatement) {
+    return t.variableDeclaration("let", [
+      t.variableDeclarator(className, init)
+    ]);
+  } else {
+    return init;
   }
 };
 
@@ -149,7 +133,7 @@ Class.prototype.buildBody = function () {
 
   if (!this.hasConstructor && superName && !t.isFalsyExpression(superName)) {
     constructor.body.body.push(util.template("class-super-constructor-call", {
-      SUPER_NAME: superName
+      CLASS_NAME: className
     }, true));
   }
 
@@ -157,15 +141,11 @@ Class.prototype.buildBody = function () {
   var staticProps;
 
   if (this.hasInstanceMutators) {
-    var protoId = util.template("prototype-identifier", {
-      CLASS_NAME: className
-    });
-
-    instanceProps = util.buildDefineProperties(this.instanceMutatorMap, protoId);
+    instanceProps = util.buildDefineProperties(this.instanceMutatorMap);
   }
 
   if (this.hasStaticMutators) {
-    staticProps = util.buildDefineProperties(this.staticMutatorMap, className);
+    staticProps = util.buildDefineProperties(this.staticMutatorMap);
   }
 
   if (instanceProps || staticProps) {
@@ -190,70 +170,49 @@ Class.prototype.pushMethod = function (node) {
   var methodName = node.key;
 
   var kind = node.kind;
+  var mutatorMap = this.instanceMutatorMap;
+  if (node.static) {
+    this.hasStaticMutators = true;
+    mutatorMap = this.staticMutatorMap;
+  } else {
+    this.hasInstanceMutators = true;
+  }
 
   if (kind === "") {
-    // method
-
-    var className = this.className;
-    if (!node.static) className = t.memberExpression(className, t.identifier("prototype"));
-    methodName = t.memberExpression(className, methodName, node.computed);
-
-    var expr = t.expressionStatement(t.assignmentExpression("=", methodName, node.value));
-    t.inheritsComments(expr, node);
-    this.body.push(expr);
-  } else {
-    // mutator
-    var mutatorMap = this.instanceMutatorMap;
-    if (node.static) {
-      this.hasStaticMutators = true;
-      mutatorMap = this.staticMutatorMap;
-    } else {
-      this.hasInstanceMutators = true;
-    }
-    util.pushMutatorMap(mutatorMap, methodName, kind, node);
+    kind = "value";
   }
+
+  util.pushMutatorMap(mutatorMap, methodName, kind, node.computed, node);
 };
 
 /**
- * Given a `methodNode`, produce a `MemberExpression` super class reference.
+ * Gets a node representing the super class value of the named property.
  *
- * @param {Node} methodNode MethodDefinition
- * @param {Node} node Identifier
- * @param {Node} parent
+ * @example
+ *
+ *   _get(Object.getPrototypeOf(CLASS.prototype), "METHOD", this)
+ *
+ * @param {Node} property
+ * @param {boolean} isStatic
+ * @param {boolean} isComputed
  *
  * @returns {Node}
  */
 
-Class.prototype.superIdentifier = function (methodNode, id, parent) {
-  var methodName = methodNode.key;
-  var superName  = this.superName || t.identifier("Function");
-
-  if (parent.property === id) {
-    return;
-  } else if (t.isCallExpression(parent, { callee: id })) {
-    // super(); -> ClassName.prototype.MethodName.call(this);
-    parent.arguments.unshift(t.thisExpression());
-
-    if (methodName.name === "constructor") {
-      // constructor() { super(); }
-      return t.memberExpression(superName, t.identifier("call"));
-    } else {
-      id = superName;
-
-      // foo() { super(); }
-      if (!methodNode.static) {
-        id = t.memberExpression(id, t.identifier("prototype"));
-      }
-
-      id = t.memberExpression(id, methodName, methodNode.computed);
-      return t.memberExpression(id, t.identifier("call"));
-    }
-  } else if (t.isMemberExpression(parent) && !methodNode.static) {
-    // super.test -> ClassName.prototype.test
-    return t.memberExpression(superName, t.identifier("prototype"));
-  } else {
-    return superName;
-  }
+Class.prototype.superProperty = function (property, isStatic, isComputed, thisExpression) {
+  return t.callExpression(
+    this.file.addHelper("get"),
+    [
+      t.callExpression(
+        t.memberExpression(t.identifier("Object"), t.identifier("getPrototypeOf")),
+        [
+          isStatic ? this.className : t.memberExpression(this.className, t.identifier("prototype"))
+        ]
+      ),
+      isComputed ? property : t.literal(property.name),
+      thisExpression
+    ]
+  );
 };
 
 /**
@@ -264,20 +223,53 @@ Class.prototype.superIdentifier = function (methodNode, id, parent) {
 
 Class.prototype.replaceInstanceSuperReferences = function (methodNode) {
   var method = methodNode.value;
-  var self = this;
+  var self   = this;
 
   traverse(method, {
     enter: function (node, parent) {
+      var property;
+      var computed;
+      var args;
+
       if (t.isIdentifier(node, { name: "super" })) {
-        return self.superIdentifier(methodNode, node, parent);
+        if (!(t.isMemberExpression(parent) && !parent.computed && parent.property === node)) {
+          throw self.file.errorWithNode(node, "illegal use of bare super");
+        }
       } else if (t.isCallExpression(node)) {
         var callee = node.callee;
-        if (!t.isMemberExpression(callee)) return;
-        if (callee.object.name !== "super") return;
+        if (t.isIdentifier(callee, { name: "super" })) {
+          // super(); -> _get(Object.getPrototypeOf(ClassName), "MethodName", this).call(this);
+          property = methodNode.key;
+          computed = methodNode.computed;
+          args = node.arguments;
+        } else {
+          if (!t.isMemberExpression(callee)) return;
+          if (callee.object.name !== "super") return;
 
-        // super.test(); -> ClassName.prototype.MethodName.call(this);
-        t.appendToMemberExpression(callee, t.identifier("call"));
-        node.arguments.unshift(t.thisExpression());
+          // super.test(); -> _get(Object.getPrototypeOf(ClassName.prototype), "test", this).call(this);
+          property = callee.property;
+          computed = callee.computed;
+          args = node.arguments;
+        }
+      } else if (t.isMemberExpression(node)) {
+        if (!t.isIdentifier(node.object, { name: "super" })) return;
+
+        // super.name; -> _get(Object.getPrototypeOf(ClassName.prototype), "name", this);
+        property = node.property;
+        computed = node.computed;
+      }
+
+      if (property) {
+        var thisExpression = t.thisExpression();
+        var superProperty = self.superProperty(property, methodNode.static, computed, thisExpression);
+        if (args) {
+          return t.callExpression(
+            t.memberExpression(superProperty, t.identifier("call"), false),
+            [thisExpression].concat(args)
+          );
+        } else {
+          return superProperty;
+        }
       }
     }
   });
@@ -290,7 +282,7 @@ Class.prototype.replaceInstanceSuperReferences = function (methodNode) {
  */
 
 Class.prototype.pushConstructor = function (method) {
-  if (method.kind !== "") {
+  if (method.kind) {
     throw this.file.errorWithNode(method, "illegal kind for constructor method");
   }
 

lib/6to5/transformation/transformers/es6-computed-property-names.js

@@ -7,7 +7,7 @@ exports.ObjectExpression = function (node, parent, file, scope) {
   var i;
 
   for (i in node.properties) {
-    hasComputed = t.isProperty(node.properties[i], { computed: true });
+    hasComputed = t.isProperty(node.properties[i], { computed: true, kind: "init" });
     if (hasComputed) break;
   }
 
@@ -25,6 +25,8 @@ exports.ObjectExpression = function (node, parent, file, scope) {
 
   for (i in props) {
     prop = props[i];
+    if (prop.kind !== "init") continue;
+
     key = prop.key;
 
     if (!prop.computed && t.isIdentifier(key)) {
@@ -44,7 +46,7 @@ exports.ObjectExpression = function (node, parent, file, scope) {
       broken = true;
     }
 
-    if (!broken || t.isLiteral(t.toComputedKey(prop, prop.key), { value: "__proto__" })) {
+    if (prop.kind !== "init" || !broken || t.isLiteral(t.toComputedKey(prop, prop.key), { value: "__proto__" })) {
       initProps.push(prop);
       props[i] = null;
     }

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

@@ -134,7 +134,7 @@ var pushPattern = function (opts) {
   var file = opts.file;
   var scope = opts.scope;
 
-  if (!t.isMemberExpression(parentId) && !t.isIdentifier(parentId)) {
+  if (!t.isArrayExpression(parentId) && !t.isMemberExpression(parentId) && !t.isIdentifier(parentId)) {
     var key = scope.generateUidBasedOnNode(parentId, file);
 
     nodes.push(t.variableDeclaration("var", [
@@ -300,10 +300,17 @@ exports.VariableDeclaration = function (node, parent, file, scope) {
       file:    file,
       scope:   scope
     };
+
     if (t.isPattern(pattern) && patternId) {
       pushPattern(opts);
+
+      if (+i !== node.declarations.length - 1) {
+        // we aren't the last declarator so let's just make the
+        // last transformed node inherit from us
+        t.inherits(nodes[nodes.length - 1], declar);
+      }
     } else {
-      nodes.push(buildVariableAssign(opts, declar.id, declar.init));
+      nodes.push(t.inherits(buildVariableAssign(opts, declar.id, declar.init), declar));
     }
   }
 

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

@@ -8,7 +8,7 @@ exports.ForOfStatement = function (node, parent, file, scope) {
   var stepKey   = file.generateUidIdentifier("step", scope);
   var stepValue = t.memberExpression(stepKey, t.identifier("value"));
 
-  if (t.isIdentifier(left)) {
+  if (t.isIdentifier(left) || t.isPattern(left)) {
     declar = t.expressionStatement(t.assignmentExpression("=", left, stepValue));
   } else if (t.isVariableDeclaration(left)) {
     declar = t.variableDeclaration(left.kind, [

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

@@ -37,7 +37,6 @@ exports.VariableDeclaration = function (node, parent) {
 exports.Loop = function (node, parent, file, scope) {
   var init = node.left || node.init;
   if (isLet(init, node)) {
-    t.ensureBlock(node);
     node.body._letDeclars = [init];
   }
 

lib/6to5/transformation/transformers/es6-property-method-assignment.js

@@ -46,14 +46,14 @@ exports.Property = function (node, parent, file, scope) {
   }
 };
 
-exports.ObjectExpression = function (node, parent, file, scope) {
+exports.ObjectExpression = function (node) {
   var mutatorMap = {};
   var hasAny = false;
 
   node.properties = node.properties.filter(function (prop) {
     if (prop.kind === "get" || prop.kind === "set") {
       hasAny = true;
-      util.pushMutatorMap(mutatorMap, prop.key, prop.kind, prop.value);
+      util.pushMutatorMap(mutatorMap, prop.key, prop.kind, prop.computed, prop.value);
       return false;
     } else {
       return true;
@@ -62,21 +62,8 @@ exports.ObjectExpression = function (node, parent, file, scope) {
 
   if (!hasAny) return;
 
-  if (node.properties.length) {
-    var objId = scope.generateUidBasedOnNode(parent, file);
-
-    return util.template("object-define-properties-closure", {
-      KEY: objId,
-      OBJECT: node,
-      CONTENT: util.template("object-define-properties", {
-        OBJECT: objId,
-        PROPS:  util.buildDefineProperties(mutatorMap)
-      })
-    });
-  } else {
-    return util.template("object-define-properties", {
-      OBJECT: node,
-      PROPS:  util.buildDefineProperties(mutatorMap)
-    });
-  }
+  return t.callExpression(
+    t.memberExpression(t.identifier("Object"), t.identifier("defineProperties")),
+    [node, util.buildDefineProperties(mutatorMap)]
+  );
 };

lib/6to5/transformation/transformers/es7-object-spread.js

@@ -4,7 +4,7 @@ var t = require("../../types");
 
 exports.experimental = true;
 
-exports.ObjectExpression = function (node) {
+exports.ObjectExpression = function (node, parent, file) {
   var hasSpread = false;
   var i;
   var prop;
@@ -42,5 +42,5 @@ exports.ObjectExpression = function (node) {
     args.unshift(t.objectExpression([]));
   }
 
-  return t.callExpression(t.memberExpression(t.identifier("Object"), t.identifier("assign")), args);
+  return t.callExpression(file.addHelper("extends"), args);
 };

lib/6to5/transformation/transformers/optional-classes-fast-super.js

@@ -0,0 +1,74 @@
+var traverse = require("../../traverse");
+var util     = require("../../util");
+var t        = require("../../types");
+
+exports.optional = true;
+
+exports.Class = function (node) {
+  var superClass = node.superClass || t.identifier("Function");
+
+  var hasConstructor = false;
+  var body = node.body.body;
+
+  for (var i in body) {
+    var methodNode = body[i];
+
+    hasConstructor = hasConstructor || methodNode.key.name === "constructor";
+
+    traverse(methodNode, {
+      enter: function (node, parent) {
+        if (t.isIdentifier(node, { name: "super" })) {
+          return superIdentifier(superClass, methodNode, node, parent);
+        } else if (t.isCallExpression(node)) {
+          var callee = node.callee;
+          if (!t.isMemberExpression(callee)) return;
+          if (callee.object.name !== "super") return;
+
+          // super.test(); -> ClassName.prototype.MethodName.call(this);
+          t.appendToMemberExpression(callee, t.identifier("call"));
+          node.arguments.unshift(t.thisExpression());
+        }
+      }
+    });
+  }
+
+  if (node.superClass && !hasConstructor) {
+    body.unshift(t.methodDefinition(
+      t.identifier("constructor"),
+      util.template("class-super-constructor-call-fast", {
+        SUPER_NAME: superClass
+      })
+    ));
+  }
+};
+
+var superIdentifier = function (superClass, methodNode, id, parent) {
+  var methodName = methodNode.key;
+
+  if (parent.property === id) {
+    return;
+  } else if (t.isCallExpression(parent, { callee: id })) {
+    // super(); -> ClassName.prototype.MethodName.call(this);
+    parent.arguments.unshift(t.thisExpression());
+
+    if (methodName.name === "constructor") {
+      // constructor() { super(); }
+      return t.memberExpression(superClass, t.identifier("call"));
+    } else {
+      id = superClass;
+
+      // foo() { super(); }
+      if (!methodNode.static) {
+        id = t.memberExpression(id, t.identifier("prototype"));
+      }
+
+      id = t.memberExpression(id, methodName, methodNode.computed);
+      return t.memberExpression(id, t.identifier("call"));
+    }
+  } else if (t.isMemberExpression(parent) && !methodNode.static) {
+    // super.test -> ClassName.prototype.test
+    return t.memberExpression(superClass, t.identifier("prototype"));
+  } else {
+    return superClass;
+  }
+};

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

@@ -31,8 +31,8 @@ exports.ast = {
             this.skip();
             return t.prependToMemberExpression(node, file._coreId);
           }
-        } else if (t.isIdentifier(node) && !t.isMemberExpression(parent) && t.isReferenced(node, parent) && coreHas(node)) {
-          // new Promise -> new _core.Promise
+        } else if (t.isIdentifier(node) && !t.isMemberExpression(parent) && t.isReferenced(node, parent) && node.name === "Symbol") {
+          // new Symbol -> new _core.Symbol
           return t.memberExpression(file._coreId, node);
         } else if (t.isCallExpression(node)) {
           // arr[Symbol.iterator]() -> _core.$for.getIterator(arr)

lib/6to5/transformation/transformers/optional-for-of-fast.js

@@ -0,0 +1,37 @@
+var util = require("../../util");
+var t    = require("../../types");
+
+exports.optional = true;
+
+exports.ForOfStatement = function (node, parent, file, scope) {
+  var left = node.left;
+  var declar, id;
+
+  if (t.isIdentifier(left) || t.isPattern(left)) {
+    id = left;
+  } else if (t.isVariableDeclaration(left)) {
+    id = left.declarations[0].id;
+    declar = t.variableDeclaration(left.kind, [
+      t.variableDeclarator(id)
+    ]);
+  } else {
+    throw file.errorWithNode(left, "Unknown node type " + left.type + " in ForOfStatement");
+  }
+
+  var node2 = util.template("for-of-fast", {
+    LOOP_OBJECT:  file.generateUidIdentifier("loopObject", scope),
+    IS_ARRAY:     file.generateUidIdentifier("isArray", scope),
+    OBJECT:       node.right,
+    INDEX:        file.generateUidIdentifier("i", scope),
+    ID:           id
+  });
+
+  t.inheritsComments(node2, node);
+  t.ensureBlock(node);
+
+  var block = node2.body;
+  if (declar) block.body.unshift(declar);
+  block.body = block.body.concat(node.body.body);
+
+  return node2;
+};

lib/6to5/transformation/transformers/optional-proto-to-assign.js

@@ -1,8 +1,6 @@
 var t = require("../../types");
 var _ = require("lodash");
 
-var OBJECT_ASSIGN_MEMBER = t.memberExpression(t.identifier("Object"), t.identifier("assign"));
-
 var isProtoKey = function (node) {
   return t.isLiteral(t.toComputedKey(node, node.key), { value: "__proto__" });
 };
@@ -43,7 +41,7 @@ exports.ExpressionStatement = function (node, parent, file) {
   }
 };
 
-exports.ObjectExpression = function (node) {
+exports.ObjectExpression = function (node, parent, file) {
   var proto;
 
   for (var i in node.properties) {
@@ -58,6 +56,6 @@ exports.ObjectExpression = function (node) {
   if (proto) {
     var args = [t.objectExpression([]), proto];
     if (node.properties.length) args.push(node);
-    return t.callExpression(OBJECT_ASSIGN_MEMBER, args);
+    return t.callExpression(file.addHelper("extends"), args);
   }
 };

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

@@ -32,12 +32,17 @@ exports.XJSExpressionContainer = function (node) {
 exports.XJSAttribute = {
   exit: function (node) {
     var value = node.value || t.literal(true);
-    return t.property("init", node.name, value);
+    return t.inherits(t.property("init", node.name, value), node);
   }
 };
 
+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;
@@ -96,7 +103,21 @@ exports.XJSOpeningElement = {
 
     args.push(props);
 
-    tagExpr = t.memberExpression(t.identifier("React"), t.identifier("createElement"));
+    if (reactCompat) {
+      if (tagName && isTag(tagName)) {
+        return t.callExpression(
+          t.memberExpression(
+            t.memberExpression(t.identifier("React"), t.identifier("DOM")),
+            tagExpr,
+            t.isLiteral(tagExpr)
+          ),
+          args
+        );
+      }
+    } else {
+      tagExpr = t.memberExpression(t.identifier("React"), t.identifier("createElement"));
+    }
+
     return t.callExpression(tagExpr, args);
   }
 };
@@ -119,16 +140,16 @@ exports.XJSElement = {
           var isLastLine = +i === lines.length - 1;
 
           // replace rendered whitespace tabs with spaces
-          var trimmedLine = line.replace(/\t/g, ' ');
+          var trimmedLine = line.replace(/\t/g, " ");
 
           // trim whitespace touching a newline
           if (!isFirstLine) {
-            trimmedLine = trimmedLine.replace(/^[ ]+/, '');
+            trimmedLine = trimmedLine.replace(/^[ ]+/, "");
           }
 
           // trim whitespace touching an endline
           if (!isLastLine) {
-            trimmedLine = trimmedLine.replace(/[ ]+$/, '');
+            trimmedLine = trimmedLine.replace(/[ ]+$/, "");
           }
 
           if (trimmedLine) {
@@ -144,6 +165,10 @@ exports.XJSElement = {
       callExpr.arguments.push(child);
     }
 
+    if (callExpr.arguments.length >= 3) {
+      callExpr._prettyCall = true;
+    }
+
     return t.inherits(callExpr, node);
   }
 };

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-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/spec-setters.js

@@ -0,0 +1,6 @@
+exports.MethodDefinition =
+exports.Property = function (node, parent, file) {
+  if (node.kind === "set" && node.value.params.length !== 1) {
+    throw file.errorWithNode(node.value, "Setters must have only one parameter");
+  }
+};

lib/6to5/traverse/index.js

@@ -4,15 +4,101 @@ var Scope = require("./scope");
 var t     = require("../types");
 var _     = require("lodash");
 
+function TraversalContext(previousContext) {
+  this.didSkip = false;
+  this.didRemove = false;
+  this.didStop = false;
+  this.didFlatten = previousContext ? previousContext.didFlatten : false;
+}
+
+TraversalContext.prototype.flatten = function () {
+  this.didFlatten = true;
+};
+
+TraversalContext.prototype.remove = function () {
+  this.didRemove = true;
+  this.skip();
+};
+
+TraversalContext.prototype.skip = function () {
+  this.didSkip = true;
+};
+
+TraversalContext.prototype.stop = function () {
+  this.didStop = true;
+  this.skip();
+};
+
+TraversalContext.prototype.maybeReplace = function (result, obj, key, node) {
+  if (result === false) return node;
+  if (result == null) return node;
+
+  var isArray = Array.isArray(result);
+
+  // inherit comments from original node to the first replacement node
+  var inheritTo = result;
+  if (isArray) inheritTo = result[0];
+  if (inheritTo) t.inheritsComments(inheritTo, node);
+
+  // replace the node
+  node = obj[key] = result;
+
+  // we're replacing a statement or block node with an array of statements so we better
+  // ensure that it's a block
+  if (isArray && _.contains(t.STATEMENT_OR_BLOCK_KEYS, key) && !t.isBlockStatement(obj)) {
+    t.ensureBlock(obj, key);
+  }
+
+  if (isArray) {
+    this.flatten();
+  }
+
+  return node;
+};
+
+TraversalContext.prototype.visit = function (obj, key, opts, scope, parent) {
+  var node = obj[key];
+  if (!node) return;
+
+  // type is blacklisted
+  if (opts.blacklist && opts.blacklist.indexOf(node.type) > -1) return;
+
+  var result;
+  var ourScope = scope;
+  if (t.isScope(node)) ourScope = new Scope(node, scope);
+
+  // enter
+  if (opts.enter) {
+    result = opts.enter.call(this, node, parent, ourScope);
+    node = this.maybeReplace(result, obj, key, node);
+
+    if (this.didRemove) {
+      obj[key] = null;
+      this.flatten();
+    }
+
+    // stop traversal
+    if (this.didSkip) return;
+  }
+
+  // traverse node
+  traverse(node, opts, ourScope);
+
+  // exit
+  if (opts.exit) {
+    result = opts.exit.call(this, node, parent, ourScope);
+    node = this.maybeReplace(result, obj, key, node);
+  }
+};
+
 function traverse(parent, opts, scope) {
   // falsy node
   if (!parent) return;
 
   // array of nodes
-  if (_.isArray(parent)) {
-    _.each(parent, function (node) {
-      traverse(node, opts, scope);
-    });
+  if (Array.isArray(parent)) {
+    for (var i = 0; i < parent.length; i++)
+      traverse(parent[i], opts, scope);
     return;
   }
 
@@ -21,99 +107,21 @@ function traverse(parent, opts, scope) {
   if (!keys) return;
 
   opts = opts || {};
+  var context = null;
 
-  var stopped = false;
-
-  for (var i in keys) {
-    var key = keys[i];
+  for (var j = 0; j < keys.length; j++) {
+    var key = keys[j];
     var nodes = parent[key];
     if (!nodes) continue;
 
-    var flatten = false;
-
-    var handle = function (obj, key) {
-      var node = obj[key];
-      if (!node) return;
-
-      // type is blacklisted
-      if (opts.blacklist && opts.blacklist.indexOf(node.type) > -1) return;
-
-      // replace node
-      var maybeReplace = function (result) {
-        if (result === false) return;
-        if (result == null) return;
-
-        var isArray = _.isArray(result);
-
-        // inherit comments from original node to the first replacement node
-        var inheritTo = result;
-        if (isArray) inheritTo = result[0];
-        if (inheritTo) t.inheritsComments(inheritTo, node);
-
-        // replace the node
-        node = obj[key] = result;
-
-        if (isArray) flatten = true;
-
-        // we're replacing a statement or block node with an array of statements so we better
-        // ensure that it's a block
-        if (isArray && _.contains(t.STATEMENT_OR_BLOCK_KEYS, key) && !t.isBlockStatement(obj)) {
-          t.ensureBlock(obj, key);
-        }
-      };
-
-      var skipped = false;
-      var removed = false;
-
-      var context = {
-        stop: function () {
-          skipped = stopped = true;
-        },
-
-        skip: function () {
-          skipped = true;
-        },
-
-        remove: function () {
-          this.skip();
-          removed = true;
-        }
-      };
-
-      //
-      var ourScope = scope;
-      if (t.isScope(node)) ourScope = new Scope(node, scope);
-
-      // enter
-      if (opts.enter) {
-        var result = opts.enter.call(context, node, parent, ourScope);
-        maybeReplace(result);
-
-        if (removed) {
-          obj[key] = null;
-          flatten = true;
-        }
-
-        // stop iteration
-        if (skipped) return;
+    if (Array.isArray(nodes)) {
+      for (var k = 0; k < nodes.length; k++) {
+        context = new TraversalContext(context);
+        context.visit(nodes, k, opts, scope, parent);
+        if (context.didStop) return;
       }
 
-      // traverse node
-      traverse(node, opts, ourScope);
-
-      // exit
-      if (opts.exit) {
-        maybeReplace(opts.exit.call(context, node, parent, ourScope));
-      }
-    };
-
-    if (_.isArray(nodes)) {
-      for (i in nodes) {
-        handle(nodes, i);
-        if (stopped) return;
-      }
-
-      if (flatten) {
+      if (context && context.didFlatten) {
         parent[key] = _.flatten(parent[key]);
 
         if (key === "body") {
@@ -122,8 +130,9 @@ function traverse(parent, opts, scope) {
         }
       }
     } else {
-      handle(parent, key);
-      if (stopped) return;
+      context = new TraversalContext(context);
+      context.visit(parent, key, opts, scope, parent);
+      if (context.didStop) return;
     }
   }
 }

lib/6to5/traverse/scope.js

@@ -24,7 +24,13 @@ function Scope(block, parent) {
 }
 
 var vars = require("jshint/src/vars");
-Scope.defaultDeclarations = _.flatten([vars.newEcmaIdentifiers, vars.node, vars.ecmaIdentifiers, vars.reservedVars].map(_.keys));
+
+Scope.defaultDeclarations = _.flatten([
+  vars.newEcmaIdentifiers,
+  vars.node,
+  vars.ecmaIdentifiers,
+  vars.reservedVars
+].map(_.keys));
 
 Scope.add = function (node, references) {
   if (!node) return;

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

@@ -16,6 +16,7 @@
   "Literal":                 ["value"],
   "LogicalExpression":       ["operator", "left", "right"],
   "MemberExpression":        ["object", "property", "computed"],
+  "MethodDefinition":        ["key", "value", "computed", "kind"],
   "NewExpression":           ["callee", "arguments"],
   "ObjectExpression":        ["properties"],
   "Program":                 ["body"],

lib/6to5/types/index.js

@@ -320,7 +320,11 @@ t.toBlock = function (node, parent) {
     return node;
   }
 
-  if (!_.isArray(node)) {
+  if (t.isEmptyStatement(node)) {
+    node = [];
+  }
+
+  if (!Array.isArray(node)) {
     if (!t.isStatement(node)) {
       if (t.isFunction(parent)) {
         node = t.returnStatement(node);
@@ -355,16 +359,24 @@ 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] || []);
       }
     }
@@ -375,15 +387,16 @@ 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/util.js

@@ -39,7 +39,7 @@ exports.list = function (val) {
 
 exports.regexify = function (val) {
   if (!val) return new RegExp(/.^/);
-  if (_.isArray(val)) val = val.join("|");
+  if (Array.isArray(val)) val = val.join("|");
   if (_.isString(val)) return new RegExp(val);
   if (_.isRegExp(val)) return val;
   throw new TypeError("illegal type for regexify");
@@ -48,7 +48,7 @@ exports.regexify = function (val) {
 exports.arrayify = function (val) {
   if (!val) return [];
   if (_.isString(val)) return exports.list(val);
-  if (_.isArray(val)) return val;
+  if (Array.isArray(val)) return val;
   throw new TypeError("illegal type for arrayify");
 };
 
@@ -65,12 +65,12 @@ exports.sourceMapToComment = function (map) {
   return "//# sourceMappingURL=data:application/json;base64," + base64;
 };
 
-exports.pushMutatorMap = function (mutatorMap, key, kind, method) {
+exports.pushMutatorMap = function (mutatorMap, key, kind, computed, method) {
   var alias;
 
   if (t.isIdentifier(key)) {
     alias = key.name;
-    if (method.computed) alias = "computed:" + alias;
+    if (computed) alias = "computed:" + alias;
   } else if (t.isLiteral(key)) {
     alias = String(key.value);
   } else {
@@ -86,7 +86,7 @@ exports.pushMutatorMap = function (mutatorMap, key, kind, method) {
   mutatorMap[alias] = map;
 
   map._key = key;
-  if (method.computed) {
+  if (computed) {
     map._computed = true;
   }
 
@@ -101,7 +101,12 @@ exports.buildDefineProperties = function (mutatorMap) {
 
     var propNode = t.property("init", map._key, mapNode, map._computed);
 
+    if (!map.get && !map.set) {
+      map.writable = t.literal(true);
+    }
+
     map.enumerable = t.literal(true);
+    map.configurable = t.literal(true);
 
     _.each(map, function (node, key) {
       if (key[0] === "_") return;
@@ -146,10 +151,10 @@ 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) {
@@ -188,7 +193,13 @@ exports.codeFrame = function (lines, lineNumber, colNumber) {
 
 exports.repeat = function (width, cha) {
   cha = cha || " ";
-  return new Array(width + 1).join(cha);
+
+  var result = "";
+  for (var i = 0; i < width; i++) {
+    result += cha;
+  }
+
+  return result;
 };
 
 exports.normaliseAst = function (ast, comments, tokens) {
@@ -256,7 +267,7 @@ var loadTemplates = function () {
   if (!fs.existsSync(templatesLoc)) {
     throw new Error("no templates directory - this is most likely the " +
                     "result of a broken `npm publish`. Please report to " +
-                    "https://githut.com/6to5/6to5/issues");
+                    "https://github.com/6to5/6to5/issues");
   }
 
   _.each(fs.readdirSync(templatesLoc), function (name) {

package.json

@@ -1,7 +1,7 @@
 {
   "name": "6to5",
   "description": "Turn ES6 code into readable vanilla ES5 with source maps",
-  "version": "2.6.2",
+  "version": "2.10.0",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://github.com/6to5/6to5",
   "repository": {
@@ -39,11 +39,11 @@
     "test": "make test"
   },
   "dependencies": {
-    "acorn-6to5": "0.11.1-11",
+    "acorn-6to5": "0.11.1-13",
     "ast-types": "~0.6.1",
     "chokidar": "0.11.1",
     "commander": "2.5.0",
-    "core-js": "^0.4.0",
+    "core-js": "^0.4.1",
     "estraverse": "1.8.0",
     "esutils": "1.1.6",
     "esvalid": "^1.1.0",

test/esnext.js

@@ -1,5 +1,3 @@
-if (!process.env.ALL_6TO5_TESTS) return;
-
 require("./_transformation-helper")({
   name: "esnext"
 });

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

@@ -1,9 +1,11 @@
-class Animal {
+class Base {
   get sound() {
     return 'I am a ' + this.type + '.';
   }
 }
 
+class Animal extends Base {}
+
 class Cat extends Animal {
   get type() { return 'cat'; }
 

test/fixtures/generation/comments/computed-property-comments-2/expected.js

@@ -7,4 +7,5 @@ var test = {
     * Inside bracket init
     */
   "b"]: "2"
-}, ok = 42;
+},
+    ok = 42;

test/fixtures/generation/comments/variable-declarator-line-comment/expected.js

@@ -3,6 +3,7 @@ function test() {
   // Leading to VariableDeclarator
   // Leading to VariableDeclarator
   i = 20,
+
   // Leading to VariableDeclarator
   // Leading to VariableDeclarator
   j = 20;

test/fixtures/generation/comments/variable-declarator-multi-comment/expected.js

@@ -5,6 +5,7 @@ function test() {
    * Leading to VariableDeclarator
    */
   i = 20,
+
   /*
    * Leading to VariableDeclarator
    * Leading to VariableDeclarator

test/fixtures/generation/harmony-edgecase/yield-precedence/expected.js

@@ -1,5 +1,6 @@
 function* foo() {
-  var a = yield wat(), b = 2;
+  var a = yield wat(),
+      b = 2;
   var c = yield a = b;
   yield a, yield b;
   yield a = b;

test/fixtures/generation/types/UpdateExpression/actual.js

@@ -1,2 +1,3 @@
 ++i;
 i++;
+(foo++).test();

test/fixtures/generation/types/UpdateExpression/expected.js

@@ -1,2 +1,3 @@
 ++i;
 i++;
+(foo++).test();

test/fixtures/generation/types/VariableDeclaration-VariableDeclarator/expected.js

@@ -8,6 +8,9 @@ const foo = "foo";
 let foo, bar = "bar";
 var foo, bar = "bar";
 
-let foo = "foo", bar = "bar";
-var foo = "foo", bar = "bar";
-const foo = "foo", bar = "bar";
+let foo = "foo",
+    bar = "bar";
+var foo = "foo",
+    bar = "bar";
+const foo = "foo",
+      bar = "bar";

test/fixtures/transformation/es6-classes/accessing-super-class/actual.js

@@ -3,7 +3,6 @@ class Test extends Foo {
     woops.super.test();
     super();
     super.test();
-    foob(super);
 
     super(...arguments);
     super("test", ...arguments);

test/fixtures/transformation/es6-classes/accessing-super-class/expected.js

@@ -1,6 +1,33 @@
 "use strict";
 
 var _slice = Array.prototype.slice;
+var _prototypeProperties = function (child, staticProps, instanceProps) {
+  if (staticProps) Object.defineProperties(child, staticProps);
+  if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
+};
+
+var _get = function get(object, property, receiver) {
+  var desc = Object.getOwnPropertyDescriptor(object, property);
+
+  if (desc === undefined) {
+    var parent = Object.getPrototypeOf(object);
+
+    if (parent === null) {
+      return undefined;
+    } else {
+      return get(parent, property, receiver);
+    }
+  } else if ("value" in desc && desc.writable) {
+    return desc.value;
+  } else {
+    var getter = desc.get;
+    if (getter === undefined) {
+      return undefined;
+    }
+    return getter.call(receiver);
+  }
+};
+
 var _inherits = function (child, parent) {
   if (typeof parent !== "function" && parent !== null) {
     throw new TypeError("Super expression must either be null or a function, not " + typeof parent);
@@ -16,37 +43,47 @@ var _inherits = function (child, parent) {
   if (parent) child.__proto__ = parent;
 };
 
-var Test = (function () {
-  var _Foo = Foo;
+var Test = (function (Foo) {
   var Test = function Test() {
-    var _Foo$prototype$test, _Foo$prototype$test2;
+    var _get2, _get3, _get4, _get5;
     woops["super"].test();
-    _Foo.call(this);
-    _Foo.prototype.test.call(this);
-    foob(_Foo);
+    _get(Object.getPrototypeOf(Test.prototype), "constructor", this).call(this);
+    _get(Object.getPrototypeOf(Test.prototype), "test", this).call(this);
 
-    _Foo.call.apply(_Foo, [this].concat(_slice.call(arguments)));
-    _Foo.call.apply(_Foo, [this, "test"].concat(_slice.call(arguments)));
+    (_get2 = _get(Object.getPrototypeOf(Test.prototype), "constructor", this)).call.apply(_get2, [this].concat(_slice.call(arguments)));
+    (_get3 = _get(Object.getPrototypeOf(Test.prototype), "constructor", this)).call.apply(_get3, [this, "test"].concat(_slice.call(arguments)));
 
-    (_Foo$prototype$test = _Foo.prototype.test).call.apply(_Foo$prototype$test, [this].concat(_slice.call(arguments)));
-    (_Foo$prototype$test2 = _Foo.prototype.test).call.apply(_Foo$prototype$test2, [this, "test"].concat(_slice.call(arguments)));
+    (_get4 = _get(Object.getPrototypeOf(Test.prototype), "test", this)).call.apply(_get4, [this].concat(_slice.call(arguments)));
+    (_get5 = _get(Object.getPrototypeOf(Test.prototype), "test", this)).call.apply(_get5, [this, "test"].concat(_slice.call(arguments)));
   };
 
-  _inherits(Test, _Foo);
+  _inherits(Test, Foo);
 
-  Test.prototype.test = function () {
-    var _Foo$prototype$test3, _Foo$prototype$test4;
-    _Foo.prototype.test.call(this);
-    (_Foo$prototype$test3 = _Foo.prototype.test).call.apply(_Foo$prototype$test3, [this].concat(_slice.call(arguments)));
-    (_Foo$prototype$test4 = _Foo.prototype.test).call.apply(_Foo$prototype$test4, [this, "test"].concat(_slice.call(arguments)));
-  };
-
-  Test.foo = function () {
-    var _Foo$foo, _Foo$foo2;
-    _Foo.foo.call(this);
-    (_Foo$foo = _Foo.foo).call.apply(_Foo$foo, [this].concat(_slice.call(arguments)));
-    (_Foo$foo2 = _Foo.foo).call.apply(_Foo$foo2, [this, "test"].concat(_slice.call(arguments)));
-  };
+  _prototypeProperties(Test, {
+    foo: {
+      value: function () {
+        var _get6, _get7;
+        _get(Object.getPrototypeOf(Test), "foo", this).call(this);
+        (_get6 = _get(Object.getPrototypeOf(Test), "foo", this)).call.apply(_get6, [this].concat(_slice.call(arguments)));
+        (_get7 = _get(Object.getPrototypeOf(Test), "foo", this)).call.apply(_get7, [this, "test"].concat(_slice.call(arguments)));
+      },
+      writable: true,
+      enumerable: true,
+      configurable: true
+    }
+  }, {
+    test: {
+      value: function () {
+        var _get8, _get9;
+        _get(Object.getPrototypeOf(Test.prototype), "test", this).call(this);
+        (_get8 = _get(Object.getPrototypeOf(Test.prototype), "test", this)).call.apply(_get8, [this].concat(_slice.call(arguments)));
+        (_get9 = _get(Object.getPrototypeOf(Test.prototype), "test", this)).call.apply(_get9, [this, "test"].concat(_slice.call(arguments)));
+      },
+      writable: true,
+      enumerable: true,
+      configurable: true
+    }
+  });
 
   return Test;
-})();
+})(Foo);

test/fixtures/transformation/es6-classes/accessing-super-properties/expected.js

@@ -1,5 +1,27 @@
 "use strict";
 
+var _get = function get(object, property, receiver) {
+  var desc = Object.getOwnPropertyDescriptor(object, property);
+
+  if (desc === undefined) {
+    var parent = Object.getPrototypeOf(object);
+
+    if (parent === null) {
+      return undefined;
+    } else {
+      return get(parent, property, receiver);
+    }
+  } else if ("value" in desc && desc.writable) {
+    return desc.value;
+  } else {
+    var getter = desc.get;
+    if (getter === undefined) {
+      return undefined;
+    }
+    return getter.call(receiver);
+  }
+};
+
 var _inherits = function (child, parent) {
   if (typeof parent !== "function" && parent !== null) {
     throw new TypeError("Super expression must either be null or a function, not " + typeof parent);
@@ -15,14 +37,13 @@ var _inherits = function (child, parent) {
   if (parent) child.__proto__ = parent;
 };
 
-var Test = (function () {
-  var _Foo = Foo;
+var Test = (function (Foo) {
   var Test = function Test() {
-    _Foo.prototype.test;
-    _Foo.prototype.test.whatever;
+    _get(Object.getPrototypeOf(Test.prototype), "test", this);
+    _get(Object.getPrototypeOf(Test.prototype), "test", this).whatever;
   };
 
-  _inherits(Test, _Foo);
+  _inherits(Test, Foo);
 
   return Test;
-})();
+})(Foo);

test/fixtures/transformation/es6-classes/bare-super/actual.js

@@ -0,0 +1,5 @@
+class Test {
+  constructor() {
+    console.log(super);
+  }
+}

test/fixtures/transformation/es6-classes/bare-super/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "illegal use of bare super"
+}

test/fixtures/transformation/es6-classes/calling-super-properties/expected.js

@@ -1,5 +1,32 @@
 "use strict";
 
+var _prototypeProperties = function (child, staticProps, instanceProps) {
+  if (staticProps) Object.defineProperties(child, staticProps);
+  if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
+};
+
+var _get = function get(object, property, receiver) {
+  var desc = Object.getOwnPropertyDescriptor(object, property);
+
+  if (desc === undefined) {
+    var parent = Object.getPrototypeOf(object);
+
+    if (parent === null) {
+      return undefined;
+    } else {
+      return get(parent, property, receiver);
+    }
+  } else if ("value" in desc && desc.writable) {
+    return desc.value;
+  } else {
+    var getter = desc.get;
+    if (getter === undefined) {
+      return undefined;
+    }
+    return getter.call(receiver);
+  }
+};
+
 var _inherits = function (child, parent) {
   if (typeof parent !== "function" && parent !== null) {
     throw new TypeError("Super expression must either be null or a function, not " + typeof parent);
@@ -15,18 +42,24 @@ var _inherits = function (child, parent) {
   if (parent) child.__proto__ = parent;
 };
 
-var Test = (function () {
-  var _Foo = Foo;
+var Test = (function (Foo) {
   var Test = function Test() {
-    _Foo.prototype.test.whatever();
-    _Foo.prototype.test.call(this);
+    _get(Object.getPrototypeOf(Test.prototype), "test", this).whatever();
+    _get(Object.getPrototypeOf(Test.prototype), "test", this).call(this);
   };
 
-  _inherits(Test, _Foo);
+  _inherits(Test, Foo);
 
-  Test.test = function () {
-    return _Foo.wow.call(this);
-  };
+  _prototypeProperties(Test, {
+    test: {
+      value: function () {
+        return _get(Object.getPrototypeOf(Test), "wow", this).call(this);
+      },
+      writable: true,
+      enumerable: true,
+      configurable: true
+    }
+  });
 
   return Test;
-})();
+})(Foo);

test/fixtures/transformation/es6-classes/constructor/expected.js

@@ -19,13 +19,12 @@ var Test = function Test() {
   this.state = "test";
 };
 
-var Foo = (function () {
-  var _Bar = Bar;
+var Foo = (function (Bar) {
   var Foo = function Foo() {
     this.state = "test";
   };
 
-  _inherits(Foo, _Bar);
+  _inherits(Foo, Bar);
 
   return Foo;
-})();
+})(Bar);

test/fixtures/transformation/es6-classes/instance-getter-and-setter/expected.js

@@ -5,16 +5,21 @@ var _prototypeProperties = function (child, staticProps, instanceProps) {
   if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
 };
 
-var Test = function Test() {};
+var Test = (function () {
+  var Test = function Test() {};
 
-_prototypeProperties(Test, null, {
-  test: {
-    get: function () {
-      return 5 + 5;
-    },
-    set: function (val) {
-      this._test = val;
-    },
-    enumerable: true
-  }
-});
+  _prototypeProperties(Test, null, {
+    test: {
+      get: function () {
+        return 5 + 5;
+      },
+      set: function (val) {
+        this._test = val;
+      },
+      enumerable: true,
+      configurable: true
+    }
+  });
+
+  return Test;
+})();

test/fixtures/transformation/es6-classes/instance-getter/expected.js

@@ -5,13 +5,18 @@ var _prototypeProperties = function (child, staticProps, instanceProps) {
   if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
 };
 
-var Test = function Test() {};
+var Test = (function () {
+  var Test = function Test() {};
 
-_prototypeProperties(Test, null, {
-  test: {
-    get: function () {
-      return 5 + 5;
-    },
-    enumerable: true
-  }
-});
+  _prototypeProperties(Test, null, {
+    test: {
+      get: function () {
+        return 5 + 5;
+      },
+      enumerable: true,
+      configurable: true
+    }
+  });
+
+  return Test;
+})();

test/fixtures/transformation/es6-classes/instance-method/expected.js

@@ -1,7 +1,23 @@
 "use strict";
 
-var Test = function Test() {};
-
-Test.prototype.test = function () {
-  return 5 + 5;
+var _prototypeProperties = function (child, staticProps, instanceProps) {
+  if (staticProps) Object.defineProperties(child, staticProps);
+  if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
 };
+
+var Test = (function () {
+  var Test = function Test() {};
+
+  _prototypeProperties(Test, null, {
+    test: {
+      value: function () {
+        return 5 + 5;
+      },
+      writable: true,
+      enumerable: true,
+      configurable: true
+    }
+  });
+
+  return Test;
+})();