v1.11.4

.travis.yml

@@ -9,3 +9,11 @@ branches:
 
 before_script: "npm install -g codeclimate-test-reporter"
 script: "make test-travis"
+
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/acf1870e9d223c65e8d5
+    on_success: always
+    on_failure: always
+    on_start: false

lib/6to5/index.js

@@ -1,4 +1,5 @@
 var transform = require("./transformation/transform");
+var util      = require("./util");
 var fs        = require("fs");
 var _         = require("lodash");
 
@@ -14,6 +15,8 @@ exports.polyfill = function () {
   require("./polyfill");
 };
 
+exports.canCompile = util.canCompile;
+
 exports.transform = transform;
 
 exports.transformFile = function (filename, opts, callback) {

lib/6to5/runtime.js

@@ -11,16 +11,7 @@ module.exports = function (namespace) {
   var container = t.functionExpression(null, [], t.blockStatement(body));
   var tree      = t.program([t.expressionStatement(t.callExpression(container, []))]);
 
-  body.push(t.variableDeclaration("var", [
-    t.variableDeclarator(t.identifier("self"), t.conditionalExpression(
-      t.binaryExpression("===",
-        t.unaryExpression("typeof", t.identifier("global"), true),
-        t.literal("undefined")
-      ),
-      t.identifier("window"),
-      t.identifier("global"))
-    )
-  ]));
+  body.push(util.template("self-global", true));
 
   body.push(t.variableDeclaration("var", [
     t.variableDeclarator(

lib/6to5/templates/let-scoping-return.js

@@ -0,0 +1 @@
+if (typeof RETURN === "object") return RETURN.v;

lib/6to5/templates/self-global.js

@@ -0,0 +1 @@
+var self = typeof global === "undefined" ? window : global;

lib/6to5/transformation/transform.js

@@ -20,7 +20,16 @@ transform._ensureTransformerNames = function (type, keys) {
   });
 };
 
-transform.transformers = {
+transform.transformers = {};
+
+transform.moduleFormatters = {
+  common: require("./modules/common"),
+  ignore: require("./modules/ignore"),
+  amd:    require("./modules/amd"),
+  umd:    require("./modules/umd")
+};
+
+_.each({
   modules:                  require("./transformers/modules"),
   propertyNameShorthand:    require("./transformers/property-name-shorthand"),
   constants:                require("./transformers/constants"),
@@ -53,15 +62,6 @@ transform.transformers = {
   useStrict:                require("./transformers/use-strict"),
 
   _moduleFormatter:         require("./transformers/_module-formatter")
-};
-
-transform.moduleFormatters = {
-  common: require("./modules/common"),
-  ignore: require("./modules/ignore"),
-  amd:    require("./modules/amd"),
-  umd:    require("./modules/umd")
-};
-
-_.each(transform.transformers, function (transformer, key) {
+}, function (transformer, key) {
   transform.transformers[key] = new Transformer(key, transformer);
 });

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

@@ -1,4 +1,5 @@
 var traverse = require("../../traverse");
+var util     = require("../../util");
 var t        = require("../../types");
 var _        = require("lodash");
 
@@ -287,10 +288,9 @@ var run = function (forParent, block, parent, file, scope) {
 
     if (has.hasReturn) {
       // typeof ret === "object"
-      retCheck = t.ifStatement(
-        t.binaryExpression("===", t.unaryExpression("typeof", ret, true), t.literal("object")),
-        t.returnStatement(t.memberExpression(ret, t.identifier("v")))
-      );
+      retCheck = util.template("let-scoping-return", {
+        RETURN: ret,
+      });
 
       // there's no `break` or `continue` so we can just push in the `if`
       if (!has.hasBreak && !has.hasContinue) {

lib/6to5/types/index.js

@@ -162,31 +162,17 @@ t.getIds = function (node, map) {
 
   while (search.length) {
     var id = search.shift();
+    if (!id) continue;
+
+    var nodeKey = t.getIds.nodes[id.type];
+    var arrKey  = t.getIds.arrays[id.type];
 
     if (t.isIdentifier(id)) {
       ids[id.name] = id;
-    } else if (t.isArrayPattern(id)) {
-      _.each(id.elements, function (elem) {
-        search.push(elem);
-      });
-    } else if (t.isAssignmentExpression(id)) {
-      search.push(id.left);
-    } else if (t.isObjectPattern(id)) {
-      _.each(id.properties, function (prop) {
-        search.push(prop.value);
-      });
-    } else if (t.isVariableDeclaration(id)) {
-      search = search.concat(id.declarations);
-    } else if (t.isImportSpecifier(id) || t.isExportSpecifier(id) || t.isVariableDeclarator(id) || t.isFunctionDeclaration(id) || t.isClassDeclaration(id)) {
-      search.push(id.id);
-    } else if (t.isSpreadElement(id)) {
-      search.push(id.argument);
-    } else if (t.isExportDeclaration(id) || t.isImportDeclaration(id)) {
-      search = search.concat(id.specifiers);
-    } else if (t.isMemberExpression(id)) {
-      search.push(id.object);
-    } else if (t.isParenthesizedExpression(id)) {
-      search.push(id.expression);
+    } else if (nodeKey) {
+      if (id[nodeKey]) search.push(id[nodeKey]);
+    } else if (arrKey) {
+      search = search.concat(id[arrKey] || []);
     }
   }
 
@@ -194,6 +180,27 @@ t.getIds = function (node, map) {
   return ids;
 };
 
+t.getIds.nodes = {
+  AssignmentExpression: "left",
+  ImportSpecifier: "id",
+  ExportSpecifier: "id",
+  VariableDeclarator: "id",
+  FunctionDeclaration: "id",
+  ClassDeclaration: "id",
+  ParenthesizedExpression: "expression",
+  MemeberExpression: "object",
+  SpreadElement: "argument",
+  Property: "value"
+};
+
+t.getIds.arrays = {
+  ExportDeclaration: "specifiers",
+  ImportDeclaration: "specifiers",
+  VariableDeclaration: "declarations",
+  ArrayPattern: "elements",
+  ObjectPattern: "properties"
+};
+
 t.inherits = function (child, parent) {
   child.loc   = parent.loc;
   child.end   = parent.end;

lib/6to5/util.js

@@ -11,6 +11,12 @@ var _          = require("lodash");
 
 exports.inherits = util.inherits;
 
+exports.canCompile = function (filename, altExts) {
+  var exts = altExts || [".js", ".jsx", ".es6"];
+  var ext = path.extname(filename);
+  return _.contains(exts, ext);
+};
+
 exports.resolve = function (loc) {
   try {
     return require.resolve(loc);
@@ -111,6 +117,11 @@ exports.template = function (name, nodes, keepExpression) {
   var template = exports.templates[name];
   if (!template) throw new ReferenceError("unknown template " + name);
 
+  if (nodes === true) {
+    keepExpression = true;
+    nodes = null;
+  }
+
   template = _.cloneDeep(template);
 
   var inherits = false;
@@ -192,13 +203,14 @@ exports.parse = function (opts, code, callback) {
     var tokens   = [];
 
     var ast = acorn.parse(code, {
-      preserveParens: true,
-      ecmaVersion:    Infinity,
-      strictMode:     true,
-      onComment:      comments,
-      locations:      true,
-      onToken:        tokens,
-      ranges:         true
+      allowReturnOutsideFunction: true,
+      preserveParens:             true,
+      ecmaVersion:                Infinity,
+      strictMode:                 true,
+      onComment:                  comments,
+      locations:                  true,
+      onToken:                    tokens,
+      ranges:                     true
     });
 
     estraverse.attachComments(ast, comments, tokens);

package.json

@@ -1,7 +1,7 @@
 {
   "name": "6to5",
   "description": "Turn ES6 code into readable vanilla ES5 with source maps",
-  "version": "1.11.3",
+  "version": "1.11.4",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://github.com/6to5/6to5",
   "repository": {