diff --git a/modules/angular2/src/core/compiler/base_query_list.dart b/modules/angular2/src/core/compiler/base_query_list.dart
index 6c38e44d13..1b1d53bc74 100644
--- a/modules/angular2/src/core/compiler/base_query_list.dart
+++ b/modules/angular2/src/core/compiler/base_query_list.dart
@@ -10,14 +10,9 @@ import 'dart:collection';
  * For now it uses a plain list of observable callbacks.
  */
 class BaseQueryList<T> extends Object with IterableMixin<T> {
-  List<T> _results;
-  List _callbacks;
-  bool _dirty;
-
-  BaseQueryList()
-      : _results = [],
-        _callbacks = [],
-        _dirty = false;
+  List<T> _results = [];
+  List _callbacks = [];
+  bool _dirty = false;
 
   Iterator<T> get iterator => _results.iterator;
 
@@ -40,14 +35,14 @@ class BaseQueryList<T> extends Object with IterableMixin<T> {
   }
 
   onChange(callback) {
-    this._callbacks.add(callback);
+    _callbacks.add(callback);
   }
 
   removeCallback(callback) {
-    this._callbacks.remove(callback);
+    _callbacks.remove(callback);
   }
 
-  get length => this._results.length;
-  get first => this._results.first;
-  get last => this._results.last;
+  get length => _results.length;
+  get first => _results.first;
+  get last => _results.last;
 }
diff --git a/modules/angular2/src/core/compiler/base_query_list.ts b/modules/angular2/src/core/compiler/base_query_list.ts
index e87c07a014..212d0c3414 100644
--- a/modules/angular2/src/core/compiler/base_query_list.ts
+++ b/modules/angular2/src/core/compiler/base_query_list.ts
@@ -10,15 +10,9 @@ import {List, ListWrapper, MapWrapper} from 'angular2/src/facade/collection';
  * @exportedAs angular2/view
  */
 export class BaseQueryList<T> {
-  protected _results: List<T>;
-  protected _callbacks;
-  protected _dirty;
-
-  constructor() {
-    this._results = [];
-    this._callbacks = [];
-    this._dirty = false;
-  }
+  protected _results: List<T> = [];
+  protected _callbacks = [];
+  protected _dirty = false;
 
   [Symbol.iterator]() { return this._results[Symbol.iterator](); }
 
diff --git a/modules/angular2/src/core/compiler/compiler.ts b/modules/angular2/src/core/compiler/compiler.ts
index 4305c2693e..2d60a6ca0a 100644
--- a/modules/angular2/src/core/compiler/compiler.ts
+++ b/modules/angular2/src/core/compiler/compiler.ts
@@ -30,8 +30,7 @@ import * as renderApi from 'angular2/src/render/api';
  */
 @Injectable()
 export class CompilerCache {
-  _cache: Map<Type, AppProtoView>;
-  constructor() { this._cache = MapWrapper.create(); }
+  _cache: Map<Type, AppProtoView> = MapWrapper.create();
 
   set(component: Type, protoView: AppProtoView): void {
     MapWrapper.set(this._cache, component, protoView);
diff --git a/modules/angular2/src/core/compiler/dynamic_component_loader.ts b/modules/angular2/src/core/compiler/dynamic_component_loader.ts
index e71119a064..eb8a798b8b 100644
--- a/modules/angular2/src/core/compiler/dynamic_component_loader.ts
+++ b/modules/angular2/src/core/compiler/dynamic_component_loader.ts
@@ -23,13 +23,7 @@ export class ComponentRef {
  */
 @Injectable()
 export class DynamicComponentLoader {
-  private _compiler: Compiler;
-  private _viewManager: AppViewManager;
-
-  constructor(compiler: Compiler, viewManager: AppViewManager) {
-    this._compiler = compiler;
-    this._viewManager = viewManager;
-  }
+  constructor(private _compiler: Compiler, private _viewManager: AppViewManager) {}
 
   /**
    * Loads a component into the location given by the provided ElementRef. The loaded component
@@ -53,7 +47,7 @@ export class DynamicComponentLoader {
    * component's selector.
    * The loaded component receives injection normally as a hosted view.
    */
-  loadAsRoot(typeOrBinding, overrideSelector = null,
+  loadAsRoot(typeOrBinding, overrideSelector: string = null,
              injector: Injector = null): Promise<ComponentRef> {
     return this._compiler.compileInHost(this._getBinding(typeOrBinding))
         .then(hostProtoViewRef => {
diff --git a/modules/angular2/src/core/compiler/element_binder.ts b/modules/angular2/src/core/compiler/element_binder.ts
index 9e629de41a..0e25abdfa6 100644
--- a/modules/angular2/src/core/compiler/element_binder.ts
+++ b/modules/angular2/src/core/compiler/element_binder.ts
@@ -6,8 +6,10 @@ import {List, StringMap} from 'angular2/src/facade/collection';
 import * as viewModule from './view';
 
 export class ElementBinder {
-  nestedProtoView: viewModule.AppProtoView;
-  hostListeners: StringMap<string, Map<number, AST>>;
+  // updated later when events are bound
+  nestedProtoView: viewModule.AppProtoView = null;
+  // updated later, so we are able to resolve cycles
+  hostListeners: StringMap<string, Map<number, AST>> = null;
 
   constructor(public index: int, public parent: ElementBinder, public distanceToParent: int,
               public protoElementInjector: eiModule.ProtoElementInjector,
@@ -16,10 +18,6 @@ export class ElementBinder {
     if (isBlank(index)) {
       throw new BaseException('null index not allowed.');
     }
-    // updated later when events are bound
-    this.hostListeners = null;
-    // updated later, so we are able to resolve cycles
-    this.nestedProtoView = null;
   }
 
   hasStaticComponent() {
diff --git a/modules/angular2/src/core/compiler/element_ref.ts b/modules/angular2/src/core/compiler/element_ref.ts
index 593f88f160..83e60c969a 100644
--- a/modules/angular2/src/core/compiler/element_ref.ts
+++ b/modules/angular2/src/core/compiler/element_ref.ts
@@ -7,13 +7,7 @@ import {resolveInternalDomView} from 'angular2/src/render/dom/view/view';
  * @exportedAs angular2/view
  */
 export class ElementRef {
-  parentView: ViewRef;
-  boundElementIndex: number;
-
-  constructor(parentView: ViewRef, boundElementIndex: number) {
-    this.parentView = parentView;
-    this.boundElementIndex = boundElementIndex;
-  }
+  constructor(public parentView: ViewRef, public boundElementIndex: number) {}
 
   /**
    * Exposes the underlying DOM element.
diff --git a/modules/angular2/src/core/compiler/proto_view_factory.ts b/modules/angular2/src/core/compiler/proto_view_factory.ts
index 12312c3d98..38d7f0d795 100644
--- a/modules/angular2/src/core/compiler/proto_view_factory.ts
+++ b/modules/angular2/src/core/compiler/proto_view_factory.ts
@@ -20,13 +20,8 @@ import {ElementBinder} from './element_binder';
 import {ProtoElementInjector, DirectiveBinding} from './element_injector';
 
 class BindingRecordsCreator {
-  _directiveRecordsMap: Map<number, DirectiveRecord>;
-  _textNodeIndex: number;
-
-  constructor() {
-    this._directiveRecordsMap = MapWrapper.create();
-    this._textNodeIndex = 0;
-  }
+  _directiveRecordsMap: Map<number, DirectiveRecord> = MapWrapper.create();
+  _textNodeIndex: number = 0;
 
   getBindingRecords(elementBinders: List<renderApi.ElementBinder>,
                     allDirectiveMetadatas: List<renderApi.DirectiveMetadata>): List<BindingRecord> {
@@ -139,9 +134,7 @@ class BindingRecordsCreator {
 
 @Injectable()
 export class ProtoViewFactory {
-  _changeDetection: ChangeDetection;
-
-  constructor(changeDetection: ChangeDetection) { this._changeDetection = changeDetection; }
+  constructor(public _changeDetection: ChangeDetection) {}
 
   createAppProtoViews(hostComponentBinding: DirectiveBinding,
                       rootRenderProtoView: renderApi.ProtoViewDto,
@@ -432,24 +425,10 @@ function _bindDirectiveEvents(protoView, elementBinders: List<renderApi.ElementB
 
 
 class RenderProtoViewWithIndex {
-  renderProtoView: renderApi.ProtoViewDto;
-  index: number;
-  parentIndex: number;
-  boundElementIndex: number;
-  constructor(renderProtoView: renderApi.ProtoViewDto, index: number, parentIndex: number,
-              boundElementIndex: number) {
-    this.renderProtoView = renderProtoView;
-    this.index = index;
-    this.parentIndex = parentIndex;
-    this.boundElementIndex = boundElementIndex;
-  }
+  constructor(public renderProtoView: renderApi.ProtoViewDto, public index: number,
+              public parentIndex: number, public boundElementIndex: number) {}
 }
 
 class ParentProtoElementInjectorWithDistance {
-  protoElementInjector: ProtoElementInjector;
-  distance: number;
-  constructor(protoElementInjector: ProtoElementInjector, distance: number) {
-    this.protoElementInjector = protoElementInjector;
-    this.distance = distance;
-  }
+  constructor(public protoElementInjector: ProtoElementInjector, public distance: number) {}
 }
diff --git a/modules/angular2/src/core/compiler/template_resolver.ts b/modules/angular2/src/core/compiler/template_resolver.ts
index c43e4e56b7..c70d62dc29 100644
--- a/modules/angular2/src/core/compiler/template_resolver.ts
+++ b/modules/angular2/src/core/compiler/template_resolver.ts
@@ -9,9 +9,7 @@ import {reflector} from 'angular2/src/reflection/reflection';
 
 @Injectable()
 export class TemplateResolver {
-  _cache: Map<Type, /*node*/ any>;
-
-  constructor() { this._cache = MapWrapper.create(); }
+  _cache: Map<Type, /*node*/ any> = MapWrapper.create();
 
   resolve(component: Type): View {
     var view = MapWrapper.get(this._cache, component);
diff --git a/modules/angular2/src/core/compiler/view.ts b/modules/angular2/src/core/compiler/view.ts
index 2b383f40ed..ef1dec150e 100644
--- a/modules/angular2/src/core/compiler/view.ts
+++ b/modules/angular2/src/core/compiler/view.ts
@@ -33,24 +33,24 @@ export class AppViewContainer {
  *
  */
 export class AppView implements ChangeDispatcher, EventDispatcher {
-  render: renderApi.RenderViewRef;
+  render: renderApi.RenderViewRef = null;
   /// This list matches the _nodes list. It is sparse, since only Elements have ElementInjector
   rootElementInjectors: List<ElementInjector>;
-  elementInjectors: List<ElementInjector>;
-  changeDetector: ChangeDetector;
-  componentChildViews: List<AppView>;
+  elementInjectors: List<ElementInjector> = null;
+  changeDetector: ChangeDetector = null;
+  componentChildViews: List<AppView> = null;
   /// Host views that were added by an imperative view.
   /// This is a dynamically growing / shrinking array.
-  freeHostViews: List<AppView>;
+  freeHostViews: List<AppView> = [];
   viewContainers: List<AppViewContainer>;
-  preBuiltObjects: List<PreBuiltObjects>;
+  preBuiltObjects: List<PreBuiltObjects> = null;
 
   /**
    * The context against which data-binding expressions in this view are evaluated against.
    * This is always a component instance.
    */
 
-  context: any;
+  context: any = null;
 
   /**
    * Variables, local to this view, that can be used in binding expressions (in addition to the
@@ -61,16 +61,8 @@ export class AppView implements ChangeDispatcher, EventDispatcher {
 
   constructor(public renderer: renderApi.Renderer, public proto: AppProtoView,
               protoLocals: Map<string, any>) {
-    this.render = null;
-    this.changeDetector = null;
-    this.elementInjectors = null;
-    this.rootElementInjectors = null;
-    this.componentChildViews = null;
     this.viewContainers = ListWrapper.createFixedSize(this.proto.elementBinders.length);
-    this.preBuiltObjects = null;
-    this.context = null;
     this.locals = new Locals(null, MapWrapper.clone(protoLocals));  // TODO optimize this
-    this.freeHostViews = [];
   }
 
   init(changeDetector: ChangeDetector, elementInjectors: List<ElementInjector>,
@@ -166,14 +158,12 @@ export class AppView implements ChangeDispatcher, EventDispatcher {
  *
  */
 export class AppProtoView {
-  elementBinders: List<ElementBinder>;
-  protoLocals: Map<string, any>;
+  elementBinders: List<ElementBinder> = [];
+  protoLocals: Map<string, any> = MapWrapper.create();
 
   constructor(public render: renderApi.RenderProtoViewRef,
               public protoChangeDetector: ProtoChangeDetector,
               public variableBindings: Map<string, string>) {
-    this.elementBinders = [];
-    this.protoLocals = MapWrapper.create();
     if (isPresent(variableBindings)) {
       MapWrapper.forEach(variableBindings, (templateName, _) => {
         MapWrapper.set(this.protoLocals, templateName, null);
diff --git a/modules/angular2/src/core/compiler/view_container_ref.ts b/modules/angular2/src/core/compiler/view_container_ref.ts
index 3373656bdc..36e723fb7d 100644
--- a/modules/angular2/src/core/compiler/view_container_ref.ts
+++ b/modules/angular2/src/core/compiler/view_container_ref.ts
@@ -26,7 +26,7 @@ export class ViewContainerRef {
 
   get(index: number): ViewRef { return new ViewRef(this._getViews()[index]); }
 
-  get length() /* :int */ { return this._getViews().length; }
+  get length(): number { return this._getViews().length; }
 
   // TODO(rado): profile and decide whether bounds checks should be added
   // to the methods below.
diff --git a/modules/angular2/src/core/compiler/view_manager.ts b/modules/angular2/src/core/compiler/view_manager.ts
index d4c28894fc..ec5213fb73 100644
--- a/modules/angular2/src/core/compiler/view_manager.ts
+++ b/modules/angular2/src/core/compiler/view_manager.ts
@@ -16,18 +16,8 @@ import {AppViewListener} from './view_listener';
  */
 @Injectable()
 export class AppViewManager {
-  _viewPool: AppViewPool;
-  _viewListener: AppViewListener;
-  _utils: AppViewManagerUtils;
-  _renderer: Renderer;
-
-  constructor(viewPool: AppViewPool, viewListener: AppViewListener, utils: AppViewManagerUtils,
-              renderer: Renderer) {
-    this._viewPool = viewPool;
-    this._viewListener = viewListener;
-    this._utils = utils;
-    this._renderer = renderer;
-  }
+  constructor(public _viewPool: AppViewPool, public _viewListener: AppViewListener,
+              public _utils: AppViewManagerUtils, public _renderer: Renderer) {}
 
   getComponentView(hostLocation: ElementRef): ViewRef {
     var hostView = internalView(hostLocation.parentView);
diff --git a/modules/angular2/src/core/compiler/view_manager_utils.ts b/modules/angular2/src/core/compiler/view_manager_utils.ts
index 46cf5720f0..52031e1105 100644
--- a/modules/angular2/src/core/compiler/view_manager_utils.ts
+++ b/modules/angular2/src/core/compiler/view_manager_utils.ts
@@ -11,9 +11,7 @@ import {RenderViewRef} from 'angular2/src/render/api';
 
 @Injectable()
 export class AppViewManagerUtils {
-  _directiveResolver: DirectiveResolver;
-
-  constructor(metadataReader: DirectiveResolver) { this._directiveResolver = metadataReader; }
+  constructor(public _directiveResolver: DirectiveResolver) {}
 
   getComponentInstance(parentView: viewModule.AppView, boundElementIndex: number): any {
     var binder = parentView.proto.elementBinders[boundElementIndex];
diff --git a/modules/angular2/src/core/compiler/view_pool.ts b/modules/angular2/src/core/compiler/view_pool.ts
index 035617b008..667ddb22c6 100644
--- a/modules/angular2/src/core/compiler/view_pool.ts
+++ b/modules/angular2/src/core/compiler/view_pool.ts
@@ -10,11 +10,11 @@ export const APP_VIEW_POOL_CAPACITY = CONST_EXPR(new OpaqueToken('AppViewPool.vi
 @Injectable()
 export class AppViewPool {
   _poolCapacityPerProtoView: number;
-  _pooledViewsPerProtoView: Map<viewModule.AppProtoView, List<viewModule.AppView>>;
+  _pooledViewsPerProtoView: Map<viewModule.AppProtoView, List<viewModule.AppView>> =
+      MapWrapper.create();
 
   constructor(@Inject(APP_VIEW_POOL_CAPACITY) poolCapacityPerProtoView) {
     this._poolCapacityPerProtoView = poolCapacityPerProtoView;
-    this._pooledViewsPerProtoView = MapWrapper.create();
   }
 
   getView(protoView: viewModule.AppProtoView): viewModule.AppView {
diff --git a/modules/angular2/src/core/compiler/view_ref.ts b/modules/angular2/src/core/compiler/view_ref.ts
index 13ffd12149..19263e607a 100644
--- a/modules/angular2/src/core/compiler/view_ref.ts
+++ b/modules/angular2/src/core/compiler/view_ref.ts
@@ -16,9 +16,7 @@ export function internalProtoView(protoViewRef: ProtoViewRef): viewModule.AppPro
  * @exportedAs angular2/view
  */
 export class ViewRef {
-  _view: viewModule.AppView;
-
-  constructor(view: viewModule.AppView) { this._view = view; }
+  constructor(public _view: viewModule.AppView) {}
 
   get render(): RenderViewRef { return this._view.render; }
 
@@ -29,7 +27,5 @@ export class ViewRef {
  * @exportedAs angular2/view
  */
 export class ProtoViewRef {
-  _protoView: viewModule.AppProtoView;
-
-  constructor(protoView) { this._protoView = protoView; }
+  constructor(public _protoView: viewModule.AppProtoView) {}
 }