diff --git a/modules/angular2/src/common/pipes/async_pipe.ts b/modules/angular2/src/common/pipes/async_pipe.ts
index 0c6eb13482..31496e9ec4 100644
--- a/modules/angular2/src/common/pipes/async_pipe.ts
+++ b/modules/angular2/src/common/pipes/async_pipe.ts
@@ -33,7 +33,7 @@ class PromiseStrategy {
 
 var _promiseStrategy = new PromiseStrategy();
 var _observableStrategy = new ObservableStrategy();
-
+var __unused: Promise<any>;  // avoid unused import when Promise union types are erased
 
 /**
  * The `async` pipe subscribes to an Observable or Promise and returns the latest value it has
diff --git a/modules/angular2/test/web_workers/shared/web_worker_test_util.ts b/modules/angular2/test/web_workers/shared/web_worker_test_util.ts
index eb598d01d9..65255cf17e 100644
--- a/modules/angular2/test/web_workers/shared/web_worker_test_util.ts
+++ b/modules/angular2/test/web_workers/shared/web_worker_test_util.ts
@@ -17,6 +17,8 @@ import {MockEventEmitter} from './mock_event_emitter';
 import {BaseException, WrappedException} from 'angular2/src/facade/exceptions';
 import {NgZone} from 'angular2/src/core/zone/ng_zone';
 
+var __unused: Promise<any>;  // avoid unused import when Promise union types are erased
+
 /**
  * Returns two MessageBus instances that are attached to each other.
  * Such that whatever goes into one's sink comes out the others source.
diff --git a/npm-shrinkwrap.clean.json b/npm-shrinkwrap.clean.json
index 4f590bd1e2..40cec885b3 100644
--- a/npm-shrinkwrap.clean.json
+++ b/npm-shrinkwrap.clean.json
@@ -1886,6 +1886,9 @@
     "dargs": {
       "version": "4.0.1"
     },
+    "dart-style": {
+      "version": "0.2.6"
+    },
     "dart2jsaas": {
       "version": "0.0.16",
       "dependencies": {
@@ -5353,7 +5356,7 @@
       }
     },
     "ts2dart": {
-      "version": "0.7.22",
+      "version": "0.7.24",
       "dependencies": {
         "source-map": {
           "version": "0.4.4"
@@ -5836,5 +5839,5 @@
     }
   },
   "name": "angular-srcs",
-  "version": "2.0.0-beta.5"
+  "version": "2.0.0-beta.6"
 }
diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index 73a1e8d9ad..51ed922b4f 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -1,6 +1,6 @@
 {
   "name": "angular-srcs",
-  "version": "2.0.0-beta.5",
+  "version": "2.0.0-beta.6",
   "dependencies": {
     "abbrev": {
       "version": "1.0.7",
@@ -2960,6 +2960,11 @@
       "from": "dargs@>=4.0.1 <5.0.0",
       "resolved": "https://registry.npmjs.org/dargs/-/dargs-4.0.1.tgz"
     },
+    "dart-style": {
+      "version": "0.2.6",
+      "from": "dart-style@>=0.2.6 <0.3.0",
+      "resolved": "https://registry.npmjs.org/dart-style/-/dart-style-0.2.6.tgz"
+    },
     "dart2jsaas": {
       "version": "0.0.16",
       "from": "dart2jsaas@>=0.0.16 <0.0.17",
@@ -8530,9 +8535,8 @@
       }
     },
     "ts2dart": {
-      "version": "0.7.22",
-      "from": "https://registry.npmjs.org/ts2dart/-/ts2dart-0.7.22.tgz",
-      "resolved": "https://registry.npmjs.org/ts2dart/-/ts2dart-0.7.22.tgz",
+      "version": "0.7.24",
+      "from": "ts2dart@0.7.24",
       "dependencies": {
         "source-map": {
           "version": "0.4.4",
diff --git a/tools/broccoli/angular_builder.ts b/tools/broccoli/angular_builder.ts
index 032278a9d0..45d86170bb 100644
--- a/tools/broccoli/angular_builder.ts
+++ b/tools/broccoli/angular_builder.ts
@@ -2,7 +2,6 @@ var broccoli = require('broccoli');
 var fs = require('fs');
 var makeBrowserTree = require('./trees/browser_tree');
 var makeNodeTree = require('./trees/node_tree');
-var makeDartTree = require('./trees/dart_tree');
 var path = require('path');
 var printSlowTrees = require('broccoli-slow-trees');
 var Q = require('q');
@@ -111,6 +110,8 @@ export class AngularBuilder {
       logs: this.options.logs,
       projects: projects
     };
+    // Workaround for https://github.com/dart-lang/dart_style/issues/493
+    var makeDartTree = require('./trees/dart_tree');
     let tree = makeDartTree(options);
     return new broccoli.Builder(tree);
   }
diff --git a/tools/broccoli/broccoli-ts2dart.ts b/tools/broccoli/broccoli-ts2dart.ts
index 6df6fbaccc..d14dd3530d 100644
--- a/tools/broccoli/broccoli-ts2dart.ts
+++ b/tools/broccoli/broccoli-ts2dart.ts
@@ -4,17 +4,18 @@
 import fs = require('fs');
 import fse = require('fs-extra');
 import path = require('path');
-import * as ts2dart from 'ts2dart';
 import {wrapDiffingPlugin, DiffingBroccoliPlugin, DiffResult} from './diffing-broccoli-plugin';
 
 class TSToDartTranspiler implements DiffingBroccoliPlugin {
   static includeExtensions = ['.ts'];
 
-  private transpiler: ts2dart.Transpiler;
+  private transpiler: any /*ts2dart.Transpiler*/;
 
   constructor(public inputPath: string, public cachePath: string,
-              public options: ts2dart.TranspilerOptions) {
+              public options: any /*ts2dart.TranspilerOptions*/) {
     options.basePath = inputPath;
+    // Workaround for https://github.com/dart-lang/dart_style/issues/493
+    var ts2dart = require('ts2dart');
     this.transpiler = new ts2dart.Transpiler(options);
   }
 
diff --git a/tools/build/bundle.js b/tools/build/bundle.js
index c0f5693fbd..4e9ef8a464 100644
--- a/tools/build/bundle.js
+++ b/tools/build/bundle.js
@@ -5,11 +5,12 @@ var insert = require('gulp-insert');
 var fs = require('fs-extra');
 var browserify = require('browserify');
 var path = require('path');
-var Builder = require('systemjs-builder');
 
 module.exports.bundle = function(buildConfig, moduleName, outputFile, outputConfig,
     sfx) {
   var sfx = sfx || false;
+  // Workaround for https://github.com/dart-lang/dart_style/issues/493
+  var Builder = require('systemjs-builder');
   var builder = new Builder();
   builder.config(buildConfig);
   if (sfx) {