chore(build): Add traceur transpiler for broccoli.

This exactly reproduces the output tree from one of the gulp tasks, which is now removed.
Next step is to migrate another sibling task to broccoli.

Brocfile.js

@@ -0,0 +1,38 @@
+/**
+ * Build pipeline for Angular2.
+ * First time setup:
+ * $ npm install --global broccoli-cli
+ */
+var merge = require('merge');
+var TraceurCompiler = require('./tools/broccoli/traceur');
+var Funnel = require('broccoli-funnel');
+var stew = require('broccoli-stew');
+
+var _COMPILER_CONFIG_JS_DEFAULT = {
+  sourceMaps: true,
+  annotations: true,      // parse annotations
+  types: true,            // parse types
+  script: false,          // parse as a module
+  memberVariables: true,  // parse class fields
+  modules: 'instantiate'
+};
+
+var modulesTree = new Funnel('modules', {include: ['**/**'], destDir: '/'});
+
+var transpiledTree = new TraceurCompiler(modulesTree, merge(true, _COMPILER_CONFIG_JS_DEFAULT, {
+  typeAssertionModule: 'rtts_assert/rtts_assert',
+  typeAssertions: true,
+  outputLanguage: 'es6'
+}));
+
+transpiledTree = stew.rename(transpiledTree, function(relativePath) {
+  return relativePath.replace(/\.(js|es6)\.map$/, '.map')
+              .replace(/\.js$/, '.es6');
+});
+transpiledTree = stew.mv(transpiledTree, 'js/dev/es6')
+
+//transpiledTree = stew.log(transpiledTree);
+
+
+module.exports = transpiledTree;
+

gulpfile.js

@@ -1,3 +1,7 @@
+var broccoli = require('broccoli');
+var copyDereferenceSync = require('copy-dereference').sync;
+var fse = require('fs-extra');
+
 var format = require('gulp-clang-format');
 var gulp = require('gulp');
 var gulpPlugins = require('gulp-load-plugins')();
@@ -278,6 +282,47 @@ var CONFIG = {
 };
 CONFIG.test.js.cjs = CONFIG.test.js.cjs.map(function(s) {return CONFIG.dest.js.cjs + s});
 
+// ------------
+// integration point to run broccoli build
+
+var broccoliExecuted = false;
+
+gulp.task('broccoli', function() {
+  if (broccoliExecuted) {
+    throw new Error('The broccoli task can be called only once!');
+  }
+  broccoliExecuted = true;
+
+  var broccoliDist = path.join('dist', 'js', 'dev', 'es6');
+  fse.removeSync(broccoliDist);
+  fse.mkdirsSync(path.join('dist', 'js', 'dev'));
+
+  var tree = broccoli.loadBrocfile();
+  var builder = new broccoli.Builder(tree);
+  return builder.build()
+    .then(function (hash) {
+      var dir = hash.directory;
+      try {
+        copyDereferenceSync(path.join(dir, 'js', 'dev', 'es6'), broccoliDist);
+      } catch (err) {
+        if (err.code === 'EEXIST') err.message += ' (we cannot build into an existing directory)';
+        throw err;
+      }
+    })
+    .finally(function () {
+      builder.cleanup();
+    })
+    .catch(function (err) {
+      // Should show file and line/col if present
+      if (err.file) {
+        console.error('File: ' + err.file);
+      }
+      console.error(err.stack);
+      console.error('\nBuild failed');
+      process.exit(1);
+    });
+});
+
 // ------------
 // clean
 
@@ -317,15 +362,6 @@ gulp.task('build/transpile.ts.cjs', function() {
   ]);
 });
 
-gulp.task('build/transpile.js.dev.es6', transpile(gulp, gulpPlugins, {
-  src: CONFIG.transpile.src.js,
-  dest: CONFIG.dest.js.dev.es6,
-  outputExt: 'es6',
-  options: CONFIG.transpile.options.js.dev,
-  srcFolderInsertion: CONFIG.srcFolderInsertion.js
-}));
-
-
 gulp.task('build/transpile.ts.dev.es5', function() {
   var tsResult = gulp.src(CONFIG.transpile.src.ts)
                      .pipe(sourcemaps.init())
@@ -353,7 +389,7 @@ gulp.task('build/transpile.js.dev.es5', function() {
 
 gulp.task('build/transpile.js.dev', function(done) {
   runSequence(
-    'build/transpile.js.dev.es6',
+    // broccoli runs the ES6 version of this task
     'build/transpile.js.dev.es5',
     done
   );
@@ -806,6 +842,7 @@ gulp.task('build.dart', function(done) {
 
 gulp.task('build.js.dev', function(done) {
   runSequence(
+    'broccoli',
     ['build/transpile.js.dev', 'build/html.js.dev', 'build/copy.js.dev', 'build/multicopy.js.dev.es6'],
     'build/checkCircularDependencies',
     done

package.json

@@ -26,6 +26,7 @@
   },
   "dependencies": {
     "es6-module-loader": "^0.9.2",
+    "fs-extra": "^0.18.0",
     "googleapis": "1.0.x",
     "gulp-insert": "^0.4.0",
     "gulp-modify": "0.0.4",
@@ -41,7 +42,12 @@
   "devDependencies": {
     "angular": "1.3.5",
     "bower": "^1.3.12",
+    "broccoli": "^0.15.3",
+    "broccoli-funnel": "^0.2.3",
+    "broccoli-stew": "^0.2.1",
+    "broccoli-writer": "^0.1.1",
     "canonical-path": "0.0.2",
+    "copy-dereference": "^1.0.0",
     "css": "mlaval/css#issue65",
     "del": "~1",
     "dgeni": "^0.4.1",
@@ -87,6 +93,8 @@
     "through2": "^0.6.1",
     "typescript": "alexeagle/TypeScript#93dbbe2a2d0b42cefd02ac949e4bc8ab6b5b5823",
     "vinyl": "^0.4.6",
+    "walk-sync": "^0.1.3",
+    "xtend": "^4.0.0",
     "yargs": "2.3.*"
   }
 }

tools/broccoli/traceur/index.ts

@@ -0,0 +1,44 @@
+var fs = require('fs');
+var fse = require('fs-extra');
+var path = require('path');
+var traceur = require('../../transpiler');
+var walkSync = require('walk-sync');
+var Writer = require('broccoli-writer');
+var xtend = require('xtend');
+
+class TraceurFilter extends Writer {
+  constructor(private inputTree, private options = {}) {}
+
+  write(readTree, destDir) {
+    return readTree(this.inputTree)
+      .then(srcDir => {
+        walkSync(srcDir)
+          .filter(filepath => {
+            var extension = path.extname(filepath).toLowerCase();
+            return extension === '.js' || extension === '.es6';
+          })
+          .map(filepath => {
+            var options = xtend({filename: filepath}, this.options);
+
+            var fsOpts = {encoding: 'utf-8'};
+            var sourcecode = fs.readFileSync(path.join(srcDir, filepath), fsOpts);
+
+            var result = traceur.compile(options, filepath, sourcecode);
+
+            result.js = result.js + '\n//# sourceMappingURL=./' + path.basename(filepath).replace(/\.\w+$/, '.map');
+
+            var destFilepath = filepath.replace(/\.\w+$/, '.es6');
+            var destFile = path.join(destDir, destFilepath);
+            fse.mkdirsSync(path.dirname(destFile));
+            var destMap = path.join(destDir, filepath + '.map');
+
+
+            fs.writeFileSync(destFile, result.js, fsOpts);
+            result.sourceMap.file = destFilepath;
+            fs.writeFileSync(destMap, JSON.stringify(result.sourceMap), fsOpts);
+          });
+      });
+  }
+}
+
+module.exports = TraceurFilter;

tools/build/html.js

@@ -5,6 +5,7 @@ var path = require('path');
 var fs = require('fs');
 var VinylFile = require('vinyl');
 
+// used for generating html files and bootstrapping benchmarks and examples
 module.exports = function(gulp, plugins, config) {
   return function() {
     return gulp.src(config.src)