Add Uniffe to reduce closure count

xref #1309

gulpfile.js

@@ -24,6 +24,7 @@ var gulp = require('gulp');
 var fs = require('fs');
 var merge = require('merge-stream');
 var $ = require('gulp-load-plugins')();
+var uniffe = require('./utils/uniffe.js');
 var del = require('del');
 var vinylPaths = require('vinyl-paths');
 var runSequence = require('run-sequence');
@@ -217,11 +218,12 @@ gulp.task('scripts', ['jscs', 'jshint'], function() {
     'src/ripple/ripple.js'
   ];
   return gulp.src(sources)
+    .pipe(uniffe())
     .pipe($.sourcemaps.init())
     // Concatenate Scripts
     .pipe($.concat('material.js'))
     .pipe($.iife({
-      useStrict: false,
+      useStrict: true,
     }))
     .pipe(gulp.dest('./dist'))
     // Minify Scripts

package.json

@@ -7,12 +7,14 @@
   "author": "Google",
   "repository": "google/material-design-lite",
   "devDependencies": {
+    "acorn": "^2.2.0",
     "apache-server-configs": "^2.7.1",
     "browser-sync": "^2.2.3",
     "chai": "^2.0.0",
     "chai-jquery": "^2.0.0",
     "del": "^1.1.1",
     "drool": "^0.2.1",
+    "escodegen": "^1.6.1",
     "gulp": "^3.8.11",
     "gulp-autoprefixer": "^2.0.0",
     "gulp-cache": "^0.2.6",
@@ -61,7 +63,7 @@
     "require-dir": "^0.3.0",
     "run-sequence": "^1.0.2",
     "swig": "^1.4.2",
-    "through2": "^0.6.3",
+    "through2": "^2.0.0",
     "vinyl-paths": "^1.0.0"
   },
   "engines": {

utils/uniffe.js

@@ -0,0 +1,60 @@
+/**
+ *
+ *  Material Design Lite
+ *  Copyright 2015 Google Inc. All rights reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License
+ *
+ */
+'use strict';
+
+var through = require('through2');
+var escodegen = require('escodegen');
+var acorn = require('acorn');
+
+function uniffe(contents) {
+  var comments = [];
+  var tokens = [];
+
+  var ast = acorn.parse(contents, {
+    ranges: true,
+    onComment: comments,
+    onToken: tokens
+  });
+
+  escodegen.attachComments(ast, comments, tokens);
+
+  if (ast.body[0].expression.callee === undefined) {
+    return contents;
+  }
+
+  var rootProgram = ast.body[0].expression.callee.body;
+
+  rootProgram.type = 'Program';
+  // drop use strict
+  rootProgram.body = rootProgram.body.slice(1);
+  // attach all leading comments from outside iffe
+  rootProgram.leadingComments = ast.body[0].leadingComments;
+
+  return escodegen.generate(rootProgram, {comment: true});
+}
+
+module.exports = function() {
+  return through.obj(function(file, enc, cb) {
+    if (file.isBuffer()) {
+      file.contents = new Buffer(uniffe(file.contents.toString(enc)), enc);
+    }
+
+    cb(null, file);
+  });
+};