6to5-core - npm Package Compare versions

Comparing version 2.12.3 to 2.12.4

bin/6to5/dir.js

@@ -1,7 +0,7 @@
-var chokidar = require("chokidar");
-var mkdirp   = require("mkdirp");
-var path     = require("path");
-var util     = require("./util");
-var fs       = require("fs");
-var _        = require("lodash");
+var outputFileSync = require("output-file-sync");
+var chokidar       = require("chokidar");
+var path           = require("path");
+var util           = require("./util");
+var fs             = require("fs");
+var _              = require("lodash");
 
@@ -18,12 +18,9 @@ module.exports = function (commander, filenames, opts) {
 
-    var up = path.normalize(dest + "/..");
-    mkdirp.sync(up);
-
     if (commander.sourceMaps) {
       var mapLoc = dest + ".map";
       data.code = util.addSourceMappingUrl(data.code, mapLoc);
-      fs.writeFileSync(mapLoc, JSON.stringify(data.map));
+      outputFileSync(mapLoc, JSON.stringify(data.map));
     }
 
-    fs.writeFileSync(dest, data.code);
+    outputFileSync(dest, data.code);
 
@@ -30,0 +27,0 @@ console.log(src + " -> " + dest);

CONTRIBUTING.md

 # Contributing
 
-Before contributing, please read the [code of conduct](https://github.com/6to5/6to5/blob/master/CODE_OF_CONDUCT.md).
+Contributions are always welcome, no matter how large or small. Before contributing, please read the [code of conduct](https://github.com/6to5/6to5/blob/master/CODE_OF_CONDUCT.md).
 
+## Developing
+
+#### Workflow
+
+* Fork the repository
+* Clone your fork and change directory to it (`git clone [e-mail]:yourUserName/6to5.git && cd 6to5`)
+* Install the project dependencies (`make bootstrap`)
+* Link your forked clone (`npm link`)
+* Develop your changes ensuring you're fetching updates from upstream often
+* Ensure the test are passing (`make test`)
+* Create new pull request explaining your proposed change or reference an issue in your commit message
+
+#### Code Standards
+
  * **General**
@@ -6,0 +20,0 @@ * No ES6 syntax features or methods, exclusively ES5.

lib/6to5/generation/buffer.js

@@ -70,8 +70,4 @@ module.exports = Buffer;
   if (this.format.compact) return;
+  removeLast = removeLast || false;
 
-  if (_.isBoolean(i)) {
-    removeLast = i;
-    i = null;
-  }
-
   if (_.isNumber(i)) {
@@ -81,4 +77,4 @@ if (this.endsWith("{\n")) i--;
 
-    for (var j = 0; j < i; j++) {
-      this.newline(null, removeLast);
+    while (i--) {
+      this._newline(removeLast);
     }
@@ -88,2 +84,10 @@ return;
 
+  if (_.isBoolean(i)) {
+    removeLast = i;
+  }
+
+  this._newline(removeLast);
+};
+
+Buffer.prototype._newline = function (removeLast) {
   if (removeLast && this.isLast("\n")) this.removeLast("\n");
@@ -94,7 +98,28 @@
   // remove whitespace if last character was a newline
-  this.buf = this.buf.replace(/\n +$/, "\n");
-
+  this._removeSpacesAfterLastNewline();
   this._push("\n");
 };
 
+/**
+ * If buffer ends with a newline and some spaces after it, trim those spaces.
+ */
+Buffer.prototype._removeSpacesAfterLastNewline = function () {
+  var lastNewlineIndex = this.buf.lastIndexOf('\n');
+  if (lastNewlineIndex === -1)
+    return;
+
+  var index = this.buf.length - 1;
+  while (index > lastNewlineIndex) {
+    if (this.buf[index] !== ' ') {
+      break;
+    }
+
+    index--;
+  }
+
+  if (index === lastNewlineIndex) {
+    this.buf = this.buf.substring(0, index + 1);
+  }
+};
+
 Buffer.prototype.push = function (str, noIndent) {
@@ -101,0 +126,0 @@ if (this._indent && !noIndent && str !== "\n") {

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

@@ -172,3 +172,3 @@ var util = require("../../util");
   var noInits = 0;
-  for (var i in node.declarations) {
+  for (var i = 0; i < node.declarations.length; i++) {
     if (node.declarations[i].init) {
@@ -175,0 +175,0 @@ inits++;

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

@@ -16,3 +16,3 @@ module.exports = Node;
 
-    if (t["is" + type](node)) {
+    if (t.is(type, node)) {
       var fn = obj[type];
@@ -32,9 +32,7 @@ result = fn(node, parent);
 
-Node.prototype.isUserWhitespacable = function () {
-  return t.isUserWhitespacable(this.node);
+Node.isUserWhitespacable = function (node) {
+  return t.isUserWhitespacable(node);
 };
 
-Node.prototype.needsWhitespace = function (type) {
-  var parent = this.parent;
-  var node   = this.node;
+Node.needsWhitespace = function (node, parent, type) {
   if (!node) return 0;
@@ -56,14 +54,11 @@
 
-Node.prototype.needsWhitespaceBefore = function () {
-  return this.needsWhitespace("before");
+Node.needsWhitespaceBefore = function (node, parent) {
+  return Node.needsWhitespace(node, parent, "before");
 };
 
-Node.prototype.needsWhitespaceAfter = function () {
-  return this.needsWhitespace("after");
+Node.needsWhitespaceAfter = function (node, parent) {
+  return Node.needsWhitespace(node, parent, "after");
 };
 
-Node.prototype.needsParens = function () {
-  var parent = this.parent;
-  var node   = this.node;
-
+Node.needsParens = function (node, parent) {
   if (!parent) return false;
@@ -83,6 +78,3 @@
 
-Node.prototype.needsParensNoLineTerminator = function () {
-  var parent = this.parent;
-  var node   = this.node;
-
+Node.needsParensNoLineTerminator = function (node, parent) {
   if (!parent) return false;
@@ -107,15 +99,16 @@
 
-_.each(Node.prototype, function (fn, key) {
-  Node[key] = function (node, parent) {
-    var n = new Node(node, parent);
+_.each(Node, function (fn, key) {
+  Node.prototype[key] = function () {
+    // Avoid leaking arguments to prevent deoptimization
+    var args = new Array(arguments.length + 2);
 
-    // Avoid leaking arguments to prevent deoptimization
-    var skipCount = 2;
-    var args = new Array(arguments.length - skipCount);
+    args[0] = this.node;
+    args[1] = this.parent;
+
     for (var i = 0; i < args.length; i++) {
-      args[i] = arguments[i + 2];
+      args[i + 2] = arguments[i];
     }
 
-    return n[key].apply(n, args);
+    return Node[key].apply(null, args);
   };
 });

lib/6to5/generation/whitespace.js

 module.exports = Whitespace;
 
-var _ = require("lodash");
+var _    = require("lodash");
 
+/**
+ * Returns `i`th number from `base`, continuing from 0 when `max` is reached.
+ * Useful for shifting `for` loop by a fixed number but going over all items.
+ *
+ * @param {Number} i Current index in the loop
+ * @param {Number} base Start index for which to return 0
+ * @param {Number} max Array length
+ * @returns {Number} shiftedIndex
+ */
+function getLookupIndex(i, base, max) {
+  i += base;
+
+  if (i >= max)
+    i -= max;
+
+  return i;
+}
+
 function Whitespace(tokens, comments) {
   this.tokens = _.sortBy(tokens.concat(comments), "start");
-  this.used   = [];
+  this.used   = {};
+
+  // Profiling this code shows that while generator passes over it, indexes
+  // returned by `getNewlinesBefore` and `getNewlinesAfter` are always increasing.
+
+  // We use this implementation detail for an optimization: instead of always
+  // starting to look from `this.tokens[0]`, we will start `for` loops from the
+  // previous successful match. We will enumerate all tokens—but the common
+  // case will be much faster.
+
+  this._lastFoundIndex = 0;
 }
@@ -16,3 +44,5 @@
 
-  for (var i = 0; i < tokens.length; i++) {
+  for (var j = 0; j < tokens.length; j++) {
+    // optimize for forward traversal by shifting for loop index
+    var i = getLookupIndex(j, this._lastFoundIndex, this.tokens.length);
     token = tokens[i];
@@ -24,2 +54,4 @@
       endToken = token;
+
+      this._lastFoundIndex = i;
       break;
@@ -38,3 +70,5 @@ }
 
-  for (var i = 0; i < tokens.length; i++) {
+  for (var j = 0; j < tokens.length; j++) {
+    // optimize for forward traversal by shifting for loop index
+    var i = getLookupIndex(j, this._lastFoundIndex, this.tokens.length);
     token = tokens[i];
@@ -46,2 +80,4 @@
       endToken = tokens[i + 1];
+
+      this._lastFoundIndex = i;
       break;
@@ -67,8 +103,7 @@ }
   var end   = endToken.loc.start.line;
-
   var lines = 0;
 
   for (var line = start; line < end; line++) {
-    if (!_.contains(this.used, line)) {
-      this.used.push(line);
+    if (typeof this.used[line] === 'undefined') {
+      this.used[line] = true;
       lines++;
@@ -79,2 +114,2 @@ }
   return lines;
-};
+};

lib/6to5/register.js

@@ -24,47 +24,2 @@ require("./polyfill");
 
-//
-
-var blacklist  = [];
-
-var blacklistTest = function (transformer, code) {
-  try {
-    if (_.isFunction(code)) {
-      code();
-    } else {
-      new Function(code);
-    }
-    blacklist.push(transformer);
-  } catch (err) {
-    if (err.name !== "SyntaxError") throw err;
-  }
-};
-
-blacklistTest("arrayComprehension", "var foo = [for (foo of bar) foo * foo];");
-blacklistTest("generatorComprehension", "var foo = (for (foo of bar) foo * foo)");
-blacklistTest("arrowFunctions", "var foo = x => x * x;");
-blacklistTest("classes", "class Foo {}");
-blacklistTest("computedPropertyNames", "var foo = { [foo]: bar };");
-blacklistTest("constants", function () {
-  try {
-    new Function("const foo = 'foo';\nfoo = 'wow';");
-  } catch (err) {
-    return; // constants are supported
-  }
-  throw new SyntaxError;
-});
-blacklistTest("defaultParamaters", "var foo = function (bar = 0) {};");
-blacklistTest("destructuring", "var { x, y } = { x: 0, y: 0 };");
-blacklistTest("forOf", "for (var foo of bar) {}");
-blacklistTest("generators", "function* foo() {}\nasync function bar() {}"); // generators/async functions delegated to same transformer
-blacklistTest("letScoping", "let foo = 0;");
-blacklistTest("modules", 'import foo from "from";');
-blacklistTest("propertyMethodAssignment", "{ get foo() {} }");
-blacklistTest("propertyNameShorthand", "var foo = { x, y };");
-blacklistTest("restParameters", "function foo(...bar) {}");
-blacklistTest("spread", "foo(...bar);");
-blacklistTest("templateLiterals", "var foo = `foo`;");
-blacklistTest("unicodeRegex", function () { new RegExp("foo", "u"); });
-
-//
-
 var transformOpts = {};
@@ -99,3 +54,2 @@ var ignoreRegex   = /node_modules/;
     whitelist: whitelist,
-    blacklist: blacklist,
     sourceMap: true,
@@ -102,0 +56,0 @@ ast:       false

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

@@ -247,3 +247,3 @@ module.exports = DefaultFormatter;
   if (t.isVariableDeclaration(declar)) {
-    for (var i in declar.declarations) {
+    for (var i = 0; i < declar.declarations.length; i++) {
       var decl = declar.declarations[i];
@@ -254,3 +254,3 @@
       var newDeclar = t.variableDeclaration(declar.kind, [decl]);
-      if (i === "0") t.inherits(newDeclar, declar);
+      if (i === 0) t.inherits(newDeclar, declar);
       nodes.push(newDeclar);
@@ -257,0 +257,0 @@ }

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

 module.exports = SystemFormatter;
 
 var AMDFormatter = require("./amd");
-var useStrict    = require("../transformers/use-strict");
+var useStrict    = require("../helpers/use-strict");
 var traverse     = require("../../traverse");
@@ -174,3 +174,3 @@ var util         = require("../../util");
 
-  if (useStrict._has(block)) {
+  if (useStrict.has(block)) {
     handlerBody.unshift(block.body.shift());
@@ -177,0 +177,0 @@ }

lib/6to5/transformation/transform.js

@@ -23,3 +23,3 @@ module.exports = transform;
 transform._ensureTransformerNames = function (type, keys) {
-  for (var i in keys) {
+  for (var i = 0; i < keys.length; i++) {
     var key = keys[i];
@@ -26,0 +26,0 @@ if (!_.has(transform.transformers, key)) {

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

@@ -1,2 +0,2 @@
-var useStrict = require("./use-strict");
+var useStrict = require("../helpers/use-strict");
 var _         = require("lodash");
@@ -15,3 +15,3 @@
     var hasChange = false;
-    for (var i in node.body) {
+    for (var i = 0; i < node.body.length; i++) {
       var bodyNode = node.body[i];
@@ -22,3 +22,3 @@ if (bodyNode && bodyNode._blockHoist != null) hasChange = true;
 
-    useStrict._wrap(node, function () {
+    useStrict.wrap(node, function () {
       var nodePriorities = _.groupBy(node.body, function (bodyNode) {
@@ -25,0 +25,0 @@ var priority = bodyNode._blockHoist;

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

@@ -1,2 +0,2 @@
-var useStrict = require("./use-strict");
+var useStrict = require("../helpers/use-strict");
 var t         = require("../../types");
@@ -8,6 +8,8 @@
 exports.Program = function (node) {
+  if (!node._declarations) return;
+
   var kinds = {};
   var kind;
 
-  useStrict._wrap(node, function () {
+  useStrict.wrap(node, function () {
     for (var i in node._declarations) {
@@ -14,0 +16,0 @@ var declar = node._declarations[i];

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

@@ -1,5 +0,5 @@
-var propertyMethodAssignment = require("./es6-property-method-assignment");
-var traverse                 = require("../../traverse");
-var util                     = require("../../util");
-var t                        = require("../../types");
+var nameMethod = require("../helpers/name-method");
+var traverse   = require("../../traverse");
+var util       = require("../../util");
+var t          = require("../../types");
 
@@ -17,3 +17,4 @@ exports.ClassDeclaration = function (node, parent, file, scope) {
 
-    if (t.isVariableDeclarator(parent)) {
+    if (t.isVariableDeclarator(parent) && t.isIdentifier(parent.id)) {
+      // var foo = class {};
       node.id = parent.id;
@@ -135,6 +136,6 @@ }
 
-  for (var i in classBody) {
+  for (var i = 0; i < classBody.length; i++) {
     var node = classBody[i];
     if (t.isMethodDefinition(node)) {
-      this.replaceInstanceSuperReferences(node);
+      this.replaceSuperReferences(node);
 
@@ -198,3 +199,3 @@ if (node.key.name === "constructor") {
   if (kind === "") {
-    propertyMethodAssignment._namedMethod(node, this.file, this.scope);
+    nameMethod(node, this.file, this.scope);
 
@@ -305,3 +306,3 @@ if (this.isLoose) {
 
-Class.prototype.replaceInstanceSuperReferences = function (methodNode) {
+Class.prototype.replaceSuperReferences = function (methodNode) {
   var method = methodNode.value;
@@ -329,2 +330,7 @@ var self   = this;
 
+        if (t.isProperty(node, { method: true }) || t.isMethodDefinition(node)) {
+          // break on object methods
+          return this.skip();
+        }
+
         var getThisReference = function () {
@@ -331,0 +337,0 @@ if (topLevel) {

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

@@ -6,3 +6,3 @@ var t = require("../../types");
 
-  for (var i in node.properties) {
+  for (var i = 0; i < node.properties.length; i++) {
     hasComputed = t.isProperty(node.properties[i], { computed: true, kind: "init" });
@@ -43,3 +43,3 @@ if (hasComputed) break;
 var loose = function (node, body, objId) {
-  for (var i in node.properties) {
+  for (var i = 0; i < node.properties.length; i++) {
     var prop = node.properties[i];
@@ -63,3 +63,3 @@
 
-  for (var i in props) {
+  for (var i = 0; i < props.length; i++) {
     prop = props[i];
@@ -79,3 +79,3 @@ if (prop.kind !== "init") continue;
 
-  for (i in props) {
+  for (i = 0; i < props.length; i++) {
     prop = props[i];
@@ -96,3 +96,3 @@
 
-  for (i in props) {
+  for (i = 0; i < props.length; i++) {
     prop = props[i];
@@ -99,0 +99,0 @@ if (!prop) continue;

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

@@ -47,3 +47,3 @@ var traverse = require("../../traverse");
     if (t.isVariableDeclaration(child, { kind: "const" })) {
-      for (var i in child.declarations) {
+      for (var i = 0; i < child.declarations.length; i++) {
         var declar = child.declarations[i];
@@ -50,0 +50,0 @@

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

@@ -14,3 +14,2 @@ var traverse = require("../../traverse");
   var iife = false;
-  var i;
   var def;
@@ -35,3 +34,3 @@
 
-  for (i in node.defaults) {
+  for (var i = 0; i < node.defaults.length; i++) {
     def = node.defaults[i];
@@ -45,4 +44,4 @@ if (!def) continue;
     var rightIds = ids.slice(i);
-    for (i in rightIds) {
-      checkTDZ(rightIds[i]);
+    for (var i2 = 0; i2 < rightIds.length; i2++) {
+      checkTDZ(rightIds[i2]);
     }
@@ -64,3 +63,3 @@
 
-  for (i in node.defaults) {
+  for (i = 0; i < node.defaults.length; i++) {
     def = node.defaults[i];
@@ -67,0 +66,0 @@ if (!def) {

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

@@ -49,3 +49,3 @@ // TODO: Clean up
 var pushObjectPattern = function (opts, nodes, pattern, parentId) {
-  for (var i in pattern.properties) {
+  for (var i = 0; i < pattern.properties.length; i++) {
     var prop = pattern.properties[i];
@@ -55,3 +55,3 @@ if (t.isSpreadProperty(prop)) {
         var keys = [];
-        for (var i2 in pattern.properties) {
+        for (var i2 = 0; i2 < pattern.properties.length; i2++) {
           var prop2 = pattern.properties[i2];
@@ -93,3 +93,3 @@
   var hasSpreadElement = false;
-  for (i in pattern.elements) {
+  for (i = 0; i < pattern.elements.length; i++) {
     if (t.isSpreadElement(pattern.elements[i])) {
@@ -109,3 +109,3 @@ hasSpreadElement = true;
 
-  for (i in pattern.elements) {
+  for (i = 0; i < pattern.elements.length; i++) {
     var elem = pattern.elements[i];
@@ -285,3 +285,3 @@ if (!elem) continue;
   var hasPattern = false;
-  for (i in node.declarations) {
+  for (i = 0; i < node.declarations.length; i++) {
     declar = node.declarations[i];
@@ -295,3 +295,3 @@ if (t.isPattern(declar.id)) {
 
-  for (i in node.declarations) {
+  for (i = 0; i < node.declarations.length; i++) {
     declar = node.declarations[i];
@@ -326,3 +326,3 @@
 
-    for (i in nodes) {
+    for (i = 0; i < nodes.length; i++) {
       node = nodes[i];
@@ -329,0 +329,0 @@ declar = declar || t.variableDeclaration(node.kind, []);

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

@@ -28,3 +28,3 @@ var traverse = require("../../traverse");
 var standardiseLets = function (declars) {
-  for (var i in declars) {
+  for (var i = 0; i < declars.length; i++) {
     delete declars[i]._let;
@@ -235,6 +235,5 @@ }
 
-  var i;
   var declar;
 
-  for (i in opts.declarators) {
+  for (var i in opts.declarators) {
     declar = opts.declarators[i];
@@ -251,10 +250,12 @@ opts.declarators.push(declar);
 
-  for (i in block.body) {
-    declar = block.body[i];
-    if (!isLet(declar, block)) continue;
+  if (block.body) {
+    for (i = 0; i < block.body.length; i++) {
+      declar = block.body[i];
+      if (!isLet(declar, block)) continue;
 
-    var declars = t.getIds(declar, true);
-    for (var key in declars) {
-      duplicates(declars[key], key);
-      opts.keys.push(key);
+      var declars = t.getIds(declar, true);
+      for (var key in declars) {
+        duplicates(declars[key], key);
+        opts.keys.push(key);
+      }
     }
@@ -418,3 +419,3 @@ }
 
-  for (var i in node.declarations) {
+  for (var i = 0; i < node.declarations.length; i++) {
     var declar = node.declarations[i];
@@ -421,0 +422,0 @@ if (!declar.init) continue;

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

@@ -13,3 +13,3 @@ var t = require("../../types");
   if (node.specifiers.length) {
-    for (var i in node.specifiers) {
+    for (var i = 0; i < node.specifiers.length; i++) {
       file.moduleFormatter.importSpecifier(node.specifiers[i], node, nodes, parent);
@@ -43,3 +43,3 @@ }
   } else {
-    for (var i in node.specifiers) {
+    for (var i = 0; i < node.specifiers.length; i++) {
       file.moduleFormatter.exportSpecifier(node.specifiers[i], node, nodes, parent);
@@ -46,0 +46,0 @@ }

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

@@ -1,45 +0,5 @@
-var traverse = require("../../traverse");
-var util     = require("../../util");
-var t        = require("../../types");
+var nameMethod = require("../helpers/name-method");
+var util       = require("../../util");
+var t          = require("../../types");
 
-exports._namedMethod = function (node, file, scope) {
-  var key = t.toComputedKey(node, node.key);
-  if (!t.isLiteral(key)) return node; // we can't set a function id with this
-
-  var id = t.toIdentifier(key.value);
-  key = t.identifier(id);
-
-  var selfReference = false;
-  var outerDeclar = scope.get(id, true);
-
-  traverse(node, {
-    enter: function (node, parent, scope) {
-      // check if this node is an identifier that matches the same as our function id
-      if (!t.isIdentifier(node, { name: id })) return;
-
-      // check if this node is the one referenced
-      if (!t.isReferenced(node, parent)) return;
-
-      // check that we don't have a local variable declared as that removes the need
-      // for the wrapper
-      var localDeclar = scope.get(id, true);
-      if (localDeclar !== outerDeclar) return;
-
-      selfReference = true;
-      this.stop();
-    }
-  }, scope);
-
-  if (selfReference) {
-    node.value = util.template("property-method-assignment-wrapper", {
-      FUNCTION: node.value,
-      FUNCTION_ID: key,
-      FUNCTION_KEY: file.generateUidIdentifier(id, scope),
-      WRAPPER_KEY: file.generateUidIdentifier(id + "Wrapper", scope)
-    });
-  } else {
-    node.value.id = key;
-  }
-};
-
 exports.Property = function (node, parent, file, scope) {
@@ -50,3 +10,3 @@ if (!node.method) return;
 
-  exports._namedMethod(node, file, scope);
+  nameMethod(node, file, scope);
 };
@@ -53,0 +13,0 @@

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

@@ -13,2 +13,4 @@ var util = require("../../util");
   var argsId = t.identifier("arguments");
+
+  // otherwise `arguments` will be remapped in arrow functions
   argsId._ignoreAliasFunctions = true;
@@ -18,21 +20,34 @@
   var key = file.generateUidIdentifier("key");
+  var len = file.generateUidIdentifier("len");
 
   var arrKey = key;
+  var arrLen = len;
   if (node.params.length) {
-    arrKey = t.binaryExpression("-", arrKey, start);
+    // this method has additional params, so we need to subtract
+    // the index of the current argument position from the
+    // position in the array that we want to populate
+    arrKey = t.binaryExpression("-", key, start);
+
+    // we need to work out the size of the array that we're
+    // going to store all the rest parameters in, if there
+    // are less arguments than params then the array can be
+    // constructed with <1 which will cause an error
+    arrLen = t.conditionalExpression(
+      t.binaryExpression(">", len, start),
+      t.binaryExpression("-", len, start),
+      t.literal(0)
+    );
   }
 
   node.body.body.unshift(
-    t.variableDeclaration("var", [
-      t.variableDeclarator(rest, t.arrayExpression([]))
-    ]),
-
     util.template("rest", {
       ARGUMENTS: argsId,
       ARRAY_KEY: arrKey,
+      ARRAY_LEN: arrLen,
       START: start,
       ARRAY: rest,
-      KEY: key
+      KEY: key,
+      LEN: len,
     })
   );
 };

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

@@ -9,3 +9,3 @@ var t = require("../../types");
 var hasSpread = function (nodes) {
-  for (var i in nodes) {
+  for (var i = 0; i < nodes.length; i++) {
     if (t.isSpreadElement(nodes[i])) {
@@ -29,3 +29,3 @@ return true;
 
-  for (var i in props) {
+  for (var i = 0; i < props.length; i++) {
     var prop = props[i];
@@ -32,0 +32,0 @@ if (t.isSpreadElement(prop)) {

lib/6to5/transformation/transformers/es6-template-literals.js

@@ -14,3 +14,3 @@ var t = require("../../types");
 
-  for (var i in quasi.quasis) {
+  for (var i = 0; i < quasi.quasis.length; i++) {
     var elem = quasi.quasis[i];
@@ -37,3 +37,3 @@ strings.push(t.literal(elem.value.cooked));
 
-  for (i in node.quasis) {
+  for (i = 0; i < node.quasis.length; i++) {
     var elem = node.quasis[i];
@@ -54,3 +54,3 @@
 
-    for (i in nodes) {
+    for (i = 0; i < nodes.length; i++) {
       root = buildBinaryExpression(root, nodes[i]);
@@ -57,0 +57,0 @@ }

lib/6to5/transformation/transformers/es7-array-comprehension.js

@@ -1,4 +0,5 @@
-var traverse = require("../../traverse");
-var util     = require("../../util");
-var t        = require("../../types");
+var buildComprehension = require("../helpers/build-comprehension");
+var traverse           = require("../../traverse");
+var util               = require("../../util");
+var t                  = require("../../types");
 
@@ -25,3 +26,3 @@ exports.experimental = true;
 
-  body.push(exports._build(node, function () {
+  body.push(buildComprehension(node, function () {
     return util.template("array-push", {
@@ -37,24 +38,2 @@ STATEMENT: node.body,
 
-exports._build = function (node, buildBody) {
-  var self = node.blocks.shift();
-  if (!self) return;
-
-  var child = exports._build(node, buildBody);
-  if (!child) {
-    // last item
-    child = buildBody();
-
-    // add a filter as this is our final stop
-    if (node.filter) {
-      child = t.ifStatement(node.filter, t.blockStatement([child]));
-    }
-  }
-
-  return t.forOfStatement(
-    t.variableDeclaration("let", [t.variableDeclarator(self.left)]),
-    self.right,
-    t.blockStatement([child])
-  );
-};
-
 exports.ComprehensionExpression = function (node, parent, file, scope) {
@@ -61,0 +40,0 @@ if (node.generator) return;

lib/6to5/transformation/transformers/es7-generator-comprehension.js

@@ -1,2 +0,2 @@
-var arrayComprehension = require("./es7-array-comprehension");
+var buildComprehension = require("../helpers/build-comprehension");
 var t                  = require("../../types");
@@ -13,3 +13,3 @@
 
-  body.push(arrayComprehension._build(node, function () {
+  body.push(buildComprehension(node, function () {
     return t.expressionStatement(t.yieldExpression(node.body));
@@ -16,0 +16,0 @@ }));

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

@@ -11,3 +11,3 @@ // https://github.com/sebmarkbage/ecmascript-rest-spread
   var prop;
-  for (i in node.properties) {
+  for (i = 0; i < node.properties.length; i++) {
     prop = node.properties[i];
@@ -30,3 +30,3 @@ if (t.isSpreadProperty(prop)) {
 
-  for (i in node.properties) {
+  for (i = 0; i < node.properties.length; i++) {
     prop = node.properties[i];
@@ -33,0 +33,0 @@ if (t.isSpreadProperty(prop)) {

lib/6to5/transformation/transformers/optional-async-to-generator.js

@@ -1,2 +0,3 @@
-var bluebirdCoroutines = require("./optional-bluebird-coroutines");
+var remapAsyncToGenerator = require("../helpers/remap-async-to-generator");
+var bluebirdCoroutines    = require("./optional-bluebird-coroutines");
 
@@ -10,3 +11,3 @@ exports.optional = true;
 
-  return bluebirdCoroutines._Function(node, file.addHelper("async-to-generator"));
+  return remapAsyncToGenerator(node, file.addHelper("async-to-generator"));
 };

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

@@ -1,3 +0,3 @@
-var traverse = require("../../traverse");
-var t        = require("../../types");
+var remapAsyncToGenerator = require("../helpers/remap-async-to-generator");
+var t                     = require("../../types");
 
@@ -11,34 +11,10 @@ exports.manipulateOptions = function (opts) {
 
-exports._Function = function (node, callId) {
-  node.async = false;
-  node.generator = true;
 
-  traverse(node, {
-    enter: function (node) {
-      if (t.isFunction(node)) this.skip();
-
-      if (t.isAwaitExpression(node)) {
-        node.type = "YieldExpression";
-      }
-    }
-  });
-
-  var call = t.callExpression(callId, [node]);
-
-  if (t.isFunctionDeclaration(node)) {
-    var declar = t.variableDeclaration("var", [
-      t.variableDeclarator(node.id, call)
-    ]);
-    declar._blockHoist = true;
-    return declar;
-  } else {
-    return call;
-  }
-};
-
 exports.Function = function (node, parent, file) {
   if (!node.async || node.generator) return;
 
-  var id = file.addImport("bluebird");
-  return exports._Function(node, t.memberExpression(id, t.identifier("coroutine")));
+  return remapAsyncToGenerator(
+    node,
+    t.memberExpression(file.addImport("bluebird"), t.identifier("coroutine"))
+  );
 };

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

@@ -47,3 +47,3 @@ var t = require("../../types");
 
-  for (var i in node.properties) {
+  for (var i = 0; i < node.properties.length; i++) {
     var prop = node.properties[i];
@@ -50,0 +50,0 @@

lib/6to5/transformation/transformers/playground-memoization-operator.js

@@ -9,5 +9,7 @@ var t = require("../../types");
 
-var getPropRef = function (nodes, prop, file, scope) {
-  if (t.isIdentifier(prop)) {
-    return t.literal(prop.name);
+var getPropRef = function (nodes, member, file, scope) {
+  var prop = member.property;
+  var key = t.toComputedKey(member, member.property);
+  if (t.isLiteral(key)) {
+    return key;
   } else {
@@ -58,3 +60,3 @@ var temp = scope.generateUidBasedOnNode(prop, file);
   var obj  = getObjRef(nodes, left.object, file, scope);
-  var prop = getPropRef(nodes, left.property, file, scope);
+  var prop = getPropRef(nodes, left, file, scope);
 
@@ -77,3 +79,3 @@ nodes.push(t.ifStatement(
   var obj  = getObjRef(nodes, left.object, file, scope);
-  var prop = getPropRef(nodes, left.property, file, scope);
+  var prop = getPropRef(nodes, left, file, scope);
 
@@ -80,0 +82,0 @@ nodes.push(t.logicalExpression(

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

@@ -137,5 +137,4 @@ // Based upon the excellent jsx-transpiler by Ingvar Stepanyan (RReverser)
     var callExpr = node.openingElement;
-    var i;
 
-    for (i in node.children) {
+    for (var i = 0; i < node.children.length; i++) {
       var child = node.children[i];
@@ -146,7 +145,7 @@
 
-        for (i in lines) {
-          var line = lines[i];
+        for (var i2 = 0; i2 < lines.length; i2++) {
+          var line = lines[i2];
 
-          var isFirstLine = i === "0";
-          var isLastLine = +i === lines.length - 1;
+          var isFirstLine = i2 === 0;
+          var isLastLine = i2 === lines.length - 1;
 
@@ -214,3 +213,3 @@ // replace rendered whitespace tabs with spaces
 
-  for (var i in props) {
+  for (var i = 0; i < props.length; i++) {
     prop = props[i];
@@ -217,0 +216,0 @@ if (t.isIdentifier(prop.key, { name: "displayName" })) {

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

@@ -1,24 +0,7 @@
-var t = require("../../types");
+var useStrict = require("../helpers/use-strict");
+var t         = require("../../types");
 
-exports._has = function (node) {
-  var first = node.body[0];
-  return t.isExpressionStatement(first) && t.isLiteral(first.expression, { value: "use strict" });
-};
-
-exports._wrap = function (node, callback) {
-  var useStrictNode;
-  if (exports._has(node)) {
-    useStrictNode = node.body.shift();
-  }
-
-  callback();
-
-  if (useStrictNode) {
-    node.body.unshift(useStrictNode);
-  }
-};
-
 exports.ast = {
   exit: function (ast) {
-    if (!exports._has(ast.program)) {
+    if (!useStrict.has(ast.program)) {
       ast.program.body.unshift(t.expressionStatement(t.literal("use strict")));
@@ -25,0 +8,0 @@ }

lib/6to5/types/index.js

@@ -10,3 +10,14 @@ var esutils = require("esutils");
 
-var addAssert = function (type, is) {
+/**
+ * Registers `is[Type]` and `assert[Type]` generated functions for a given `type`.
+ * Pass `skipAliasCheck` to force it to directly compare `node.type` with `type`.
+ *
+ * @param {String} type
+ * @param {Boolean?} skipAliasCheck
+ */
+function registerType(type, skipAliasCheck) {
+  var is = t["is" + type] = function (node, opts) {
+    return t.is(type, node, opts, skipAliasCheck);
+  };
+
   t["assert" + type] = function (node, opts) {
@@ -18,3 +29,3 @@ opts = opts || {};
   };
-};
+}
 
@@ -27,10 +38,55 @@ t.STATEMENT_OR_BLOCK_KEYS = ["consequent", "body"];
 
+t.ALIAS_KEYS = require("./alias-keys");
+
+t.FLIPPED_ALIAS_KEYS = {};
+
 _.each(t.VISITOR_KEYS, function (keys, type) {
-  var is = t["is" + type] = function (node, opts) {
-    return node && node.type === type && t.shallowEqual(node, opts);
-  };
+  registerType(type, true);
+});
 
-  addAssert(type, is);
+_.each(t.ALIAS_KEYS, function (aliases, type) {
+  _.each(aliases, function (alias) {
+    var types = t.FLIPPED_ALIAS_KEYS[alias] = t.FLIPPED_ALIAS_KEYS[alias] || [];
+    types.push(type);
+  });
 });
 
+_.each(t.FLIPPED_ALIAS_KEYS, function (types, type) {
+  t[type.toUpperCase() + "_TYPES"] = types;
+  registerType(type, false);
+});
+
+/**
+ * Returns whether `node` is of given `type`.
+ * For better performance, use this instead of `is[Type]` when `type` is unknown.
+ * Optionally, pass `skipAliasCheck` to directly compare `node.type` with `type`.
+ *
+ * @param {String} type
+ * @param {Node} node
+ * @param {Object?} opts
+ * @param {Boolean?} skipAliasCheck
+ * @returns {Boolean} isOfType
+ */
+t.is = function (type, node, opts, skipAliasCheck) {
+  if (!node) return;
+
+  var typeMatches = (type === node.type);
+
+  if (!typeMatches && !skipAliasCheck) {
+    var aliases = t.FLIPPED_ALIAS_KEYS[type];
+
+    if (typeof aliases !== 'undefined')
+      typeMatches = aliases.indexOf(node.type) > -1;
+  }
+
+  if (!typeMatches) {
+    return false;
+  }
+
+  if (typeof opts !== 'undefined')
+    return t.shallowEqual(node, opts);
+
+  return true;
+};
+
 //
@@ -51,25 +107,2 @@
 
-//
-
-t.ALIAS_KEYS = require("./alias-keys");
-
-t.FLIPPED_ALIAS_KEYS = {};
-
-_.each(t.ALIAS_KEYS, function (aliases, type) {
-  _.each(aliases, function (alias) {
-    var types = t.FLIPPED_ALIAS_KEYS[alias] = t.FLIPPED_ALIAS_KEYS[alias] || [];
-    types.push(type);
-  });
-});
-
-_.each(t.FLIPPED_ALIAS_KEYS, function (types, type) {
-  t[type.toUpperCase() + "_TYPES"] = types;
-
-  var is = t["is" + type] = function (node, opts) {
-    return node && types.indexOf(node.type) >= 0 && t.shallowEqual(node, opts);
-  };
-
-  addAssert(type, is);
-});
-
 /**
@@ -146,13 +179,13 @@ * Description
 t.shallowEqual = function (actual, expected) {
-  var same = true;
+  var keys = Object.keys(expected);
+  var key;
 
-  if (expected) {
-    _.each(expected, function (val, key) {
-      if (actual[key] !== val) {
-        return same = false;
-      }
-    });
+  for (var i = 0; i < keys.length; i++) {
+    key = keys[i];
+
+    if (actual[key] !== expected[key])
+      return false;
   }
 
-  return same;
+  return true;
 };
@@ -206,3 +239,3 @@
     // we're a rest parameter
-    if (_.contains(parent.params, node)) return false;
+    if (parent.rest === node) return false;
   }
@@ -416,3 +449,3 @@
     } else if (nodeKeys) {
-      for (i in nodeKeys) {
+      for (i = 0; i < nodeKeys.length; i++) {
         key = nodeKeys[i];
@@ -425,3 +458,3 @@ if (id[key]) {
     } else if (arrKeys) {
-      for (i in arrKeys) {
+      for (i = 0; i < arrKeys.length; i++) {
         key = arrKeys[i];
@@ -428,0 +461,0 @@ search = search.concat(id[key] || []);

package.json

 {
   "name": "6to5-core",
   "description": "Turn ES6 code into readable vanilla ES5 with source maps",
-  "version": "2.12.3",
+  "version": "2.12.4",
   "author": "Sebastian McKenzie <[e-mail]>",
-  "homepage": "https://github.com/6to5/6to5",
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/6to5/6to5.git"
-  },
-  "bugs": {
-    "url": "https://github.com/6to5/6to5/issues"
-  },
+  "homepage": "https://6to5.org/",
+  "repository": "6to5/6to5",
   "main": "lib/6to5/index.js",
@@ -32,3 +26,3 @@ "browser": {
   "dependencies": {
-    "acorn-6to5": "0.11.1-14",
+    "acorn-6to5": "0.11.1-16",
     "ast-types": "~0.6.1",
@@ -43,3 +37,3 @@ "commander": "2.5.0",
     "lodash": "2.4.1",
-    "mkdirp": "0.5.0",
+    "output-file-sync": "^1.1.0",
     "private": "0.1.6",
@@ -46,0 +40,0 @@ "regenerator": "0.8.3",

templates.json

@@ -1,1 +0,1 @@
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Dependency changes

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• + Addedacorn-6to5@0.11.1-16(transitive)

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• - Removedacorn-6to5@0.11.1-14(transitive)

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• Updatedacorn-6to5@0.11.1-16