microoptimize module formatters, change method names to a new API, and add support for exporting multiple variable declarators - fixes #299

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

@@ -3,15 +3,14 @@ module.exports = DefaultFormatter;
 var traverse = require("../../traverse");
 var util     = require("../../util");
 var t        = require("../../types");
-var _        = require("lodash");
 
 function DefaultFormatter(file) {
   this.exports = [];
   this.file    = file;
 
   var localExports = [];
-  _.each(file.ast.program.body, function (node) {
-    var declar = node.declaration;
+  traverse(file.ast, function (node) {
+    var declar = node && node.declaration;
     if (t.isExportDeclaration(node) && declar && t.isStatement(declar)) {
       localExports = localExports.concat(t.getIds(declar));
     }
@@ -29,7 +28,7 @@ DefaultFormatter.prototype.remapAssignments = function () {
 
     if (t.isAssignmentExpression(node)) {
       var left = node.left;
-      if (t.isIdentifier(left) && _.contains(localExports, left.name)) {
+      if (t.isIdentifier(left) && localExports.indexOf(left.name) >= 0) {
         return t.assignmentExpression(
           "=",
           left,
@@ -119,7 +118,7 @@ DefaultFormatter.prototype._exportSpecifier = function (getRef, specifier, node,
   }
 };
 
-DefaultFormatter.prototype.export = function (node, nodes) {
+DefaultFormatter.prototype.exportDeclaration = function (node, nodes) {
   var declar = node.declaration;
 
   if (node.default) {
@@ -130,14 +129,18 @@ DefaultFormatter.prototype.export = function (node, nodes) {
     var assign;
 
     if (t.isVariableDeclaration(declar)) {
-      var decl = declar.declarations[0];
+      for (var i in declar.declarations) {
+        var decl = declar.declarations[i];
 
-      decl.init = util.template("exports-assign", {
-        VALUE: decl.init,
-        KEY:   decl.id
-      });
+        decl.init = util.template("exports-assign", {
+          VALUE: decl.init,
+          KEY:   decl.id
+        });
 
-      nodes.push(declar);
+        var newDeclar = t.variableDeclaration(declar.kind, [decl]);
+        if (i == 0) t.inherits(newDeclar, declar);
+        nodes.push(newDeclar);
+      }
     } else {
       assign = util.template("exports-assign", {
         VALUE: declar.id,

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

@@ -23,9 +23,9 @@ AMDFormatter.prototype.transform = function (ast) {
   // build an array of module names
 
   var names = [t.literal("exports")];
-  _.each(this.ids, function (id, name) {
+  for (var name in this.ids) {
     names.push(t.literal(name));
-  });
+  }
   names = t.arrayExpression(names);
 
   // build up define container
@@ -68,7 +68,7 @@ AMDFormatter.prototype._push = function (node) {
   }
 };
 
-AMDFormatter.prototype.import = function (node) {
+AMDFormatter.prototype.importDeclaration = function (node) {
   this._push(node);
 };
 

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

@@ -1,15 +1,15 @@
 module.exports = CommonJSFormatter;
 
 var DefaultFormatter = require("./_default");
+var traverse         = require("../../traverse");
 var util             = require("../../util");
 var t                = require("../../types");
-var _                = require("lodash");
 
 function CommonJSFormatter(file) {
   DefaultFormatter.apply(this, arguments);
 
   var hasNonDefaultExports = false;
-  _.each(file.ast.program.body, function (node) {
+  traverse(file.ast, function (node) {
     if (t.isExportDeclaration(node) && !node.default) hasNonDefaultExports = true;
   });
   this.hasNonDefaultExports = hasNonDefaultExports;
@@ -48,7 +48,7 @@ CommonJSFormatter.prototype.importSpecifier = function (specifier, node, nodes)
   }
 };
 
-CommonJSFormatter.prototype.import = function (node, nodes) {
+CommonJSFormatter.prototype.importDeclaration = function (node, nodes) {
   // import "foo";
   nodes.push(util.template("require", {
     //inherits: node,
@@ -57,7 +57,7 @@ CommonJSFormatter.prototype.import = function (node, nodes) {
   }, true));
 };
 
-CommonJSFormatter.prototype.export = function (node, nodes) {
+CommonJSFormatter.prototype.exportDeclaration = function (node, nodes) {
   if (node.default) {
     var declar = node.declaration;
 
@@ -74,7 +74,7 @@ CommonJSFormatter.prototype.export = function (node, nodes) {
     // hoist to the top if this default is a function
     nodes.push(this._hoistExport(declar, assign));
   } else {
-    DefaultFormatter.prototype.export.apply(this, arguments);
+    DefaultFormatter.prototype.exportDeclaration.apply(this, arguments);
   }
 };
 

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

@@ -6,19 +6,13 @@ function IgnoreFormatter() {
 
 }
 
-IgnoreFormatter.prototype.import = function () {
-
-};
-
-IgnoreFormatter.prototype.importSpecifier = function () {
-
-};
-
-IgnoreFormatter.prototype.export = function (node, nodes) {
+IgnoreFormatter.prototype.exportDeclaration = function (node, nodes) {
   var declar = t.toStatement(node.declaration, true);
   if (declar) nodes.push(t.inherits(declar, node));
 };
 
+IgnoreFormatter.prototype.importDeclaration =
+IgnoreFormatter.prototype.importSpecifier =
 IgnoreFormatter.prototype.exportSpecifier = function () {
 
 };

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

@@ -18,9 +18,9 @@ UMDFormatter.prototype.transform = function (ast) {
   // build an array of module names
 
   var names = [];
-  _.each(this.ids, function (id, name) {
+  for (var name in this.ids) {
     names.push(t.literal(name));
-  });
+  }
 
   // factory