diff --git a/modules/angular2/src/change_detection/abstract_change_detector.ts b/modules/angular2/src/change_detection/abstract_change_detector.ts
index 42f3ebaa26..58b4a73828 100644
--- a/modules/angular2/src/change_detection/abstract_change_detector.ts
+++ b/modules/angular2/src/change_detection/abstract_change_detector.ts
@@ -5,41 +5,38 @@ import {ChangeDetector} from './interfaces';
 import {CHECK_ALWAYS, CHECK_ONCE, CHECKED, DETACHED, ON_PUSH} from './constants';
 
 export class AbstractChangeDetector extends ChangeDetector {
-  lightDomChildren: List<any>;
-  shadowDomChildren: List<any>;
+  lightDomChildren: List<any> = [];
+  shadowDomChildren: List<any> = [];
   parent: ChangeDetector;
-  mode: string;
+  mode: string = null;
   ref: ChangeDetectorRef;
 
   constructor() {
     super();
-    this.lightDomChildren = [];
-    this.shadowDomChildren = [];
     this.ref = new ChangeDetectorRef(this);
-    this.mode = null;
   }
 
-  addChild(cd: ChangeDetector) {
+  addChild(cd: ChangeDetector): void {
     ListWrapper.push(this.lightDomChildren, cd);
     cd.parent = this;
   }
 
-  removeChild(cd: ChangeDetector) { ListWrapper.remove(this.lightDomChildren, cd); }
+  removeChild(cd: ChangeDetector): void { ListWrapper.remove(this.lightDomChildren, cd); }
 
-  addShadowDomChild(cd: ChangeDetector) {
+  addShadowDomChild(cd: ChangeDetector): void {
     ListWrapper.push(this.shadowDomChildren, cd);
     cd.parent = this;
   }
 
-  removeShadowDomChild(cd: ChangeDetector) { ListWrapper.remove(this.shadowDomChildren, cd); }
+  removeShadowDomChild(cd: ChangeDetector): void { ListWrapper.remove(this.shadowDomChildren, cd); }
 
-  remove() { this.parent.removeChild(this); }
+  remove(): void { this.parent.removeChild(this); }
 
-  detectChanges() { this._detectChanges(false); }
+  detectChanges(): void { this._detectChanges(false); }
 
-  checkNoChanges() { this._detectChanges(true); }
+  checkNoChanges(): void { this._detectChanges(true); }
 
-  _detectChanges(throwOnChange: boolean) {
+  _detectChanges(throwOnChange: boolean): void {
     if (this.mode === DETACHED || this.mode === CHECKED) return;
 
     this.detectChangesInRecords(throwOnChange);
@@ -53,26 +50,26 @@ export class AbstractChangeDetector extends ChangeDetector {
     if (this.mode === CHECK_ONCE) this.mode = CHECKED;
   }
 
-  detectChangesInRecords(throwOnChange: boolean) {}
-  callOnAllChangesDone() {}
+  detectChangesInRecords(throwOnChange: boolean): void {}
+  callOnAllChangesDone(): void {}
 
-  _detectChangesInLightDomChildren(throwOnChange: boolean) {
+  _detectChangesInLightDomChildren(throwOnChange: boolean): void {
     var c = this.lightDomChildren;
     for (var i = 0; i < c.length; ++i) {
       c[i]._detectChanges(throwOnChange);
     }
   }
 
-  _detectChangesInShadowDomChildren(throwOnChange: boolean) {
+  _detectChangesInShadowDomChildren(throwOnChange: boolean): void {
     var c = this.shadowDomChildren;
     for (var i = 0; i < c.length; ++i) {
       c[i]._detectChanges(throwOnChange);
     }
   }
 
-  markAsCheckOnce() { this.mode = CHECK_ONCE; }
+  markAsCheckOnce(): void { this.mode = CHECK_ONCE; }
 
-  markPathToRootAsCheckOnce() {
+  markPathToRootAsCheckOnce(): void {
     var c: ChangeDetector = this;
     while (isPresent(c) && c.mode != DETACHED) {
       if (c.mode === CHECKED) c.mode = CHECK_ONCE;
diff --git a/modules/angular2/src/change_detection/binding_record.ts b/modules/angular2/src/change_detection/binding_record.ts
index 616e4d02be..ca67656c09 100644
--- a/modules/angular2/src/change_detection/binding_record.ts
+++ b/modules/angular2/src/change_detection/binding_record.ts
@@ -13,50 +13,53 @@ export class BindingRecord {
               public elementIndex: number, public propertyName: string, public setter: SetterFn,
               public lifecycleEvent: string, public directiveRecord: DirectiveRecord) {}
 
-  callOnChange() { return isPresent(this.directiveRecord) && this.directiveRecord.callOnChange; }
+  callOnChange(): boolean {
+    return isPresent(this.directiveRecord) && this.directiveRecord.callOnChange;
+  }
 
-  isOnPushChangeDetection() {
+  isOnPushChangeDetection(): boolean {
     return isPresent(this.directiveRecord) && this.directiveRecord.isOnPushChangeDetection();
   }
 
-  isDirective() { return this.mode === DIRECTIVE; }
+  isDirective(): boolean { return this.mode === DIRECTIVE; }
 
-  isDirectiveLifecycle() { return this.mode === DIRECTIVE_LIFECYCLE; }
+  isDirectiveLifecycle(): boolean { return this.mode === DIRECTIVE_LIFECYCLE; }
 
-  isElement() { return this.mode === ELEMENT; }
+  isElement(): boolean { return this.mode === ELEMENT; }
 
-  isTextNode() { return this.mode === TEXT_NODE; }
+  isTextNode(): boolean { return this.mode === TEXT_NODE; }
 
   static createForDirective(ast: AST, propertyName: string, setter: SetterFn,
-                            directiveRecord: DirectiveRecord) {
+                            directiveRecord: DirectiveRecord): BindingRecord {
     return new BindingRecord(DIRECTIVE, 0, ast, 0, propertyName, setter, null, directiveRecord);
   }
 
-  static createDirectiveOnCheck(directiveRecord: DirectiveRecord) {
+  static createDirectiveOnCheck(directiveRecord: DirectiveRecord): BindingRecord {
     return new BindingRecord(DIRECTIVE_LIFECYCLE, 0, null, 0, null, null, "onCheck",
                              directiveRecord);
   }
 
-  static createDirectiveOnInit(directiveRecord: DirectiveRecord) {
+  static createDirectiveOnInit(directiveRecord: DirectiveRecord): BindingRecord {
     return new BindingRecord(DIRECTIVE_LIFECYCLE, 0, null, 0, null, null, "onInit",
                              directiveRecord);
   }
 
-  static createDirectiveOnChange(directiveRecord: DirectiveRecord) {
+  static createDirectiveOnChange(directiveRecord: DirectiveRecord): BindingRecord {
     return new BindingRecord(DIRECTIVE_LIFECYCLE, 0, null, 0, null, null, "onChange",
                              directiveRecord);
   }
 
-  static createForElement(ast: AST, elementIndex: number, propertyName: string) {
+  static createForElement(ast: AST, elementIndex: number, propertyName: string): BindingRecord {
     return new BindingRecord(ELEMENT, 0, ast, elementIndex, propertyName, null, null, null);
   }
 
-  static createForHostProperty(directiveIndex: DirectiveIndex, ast: AST, propertyName: string) {
+  static createForHostProperty(directiveIndex: DirectiveIndex, ast: AST,
+                               propertyName: string): BindingRecord {
     return new BindingRecord(ELEMENT, directiveIndex, ast, directiveIndex.elementIndex,
                              propertyName, null, null, null);
   }
 
-  static createForTextNode(ast: AST, elementIndex: number) {
+  static createForTextNode(ast: AST, elementIndex: number): BindingRecord {
     return new BindingRecord(TEXT_NODE, 0, ast, elementIndex, null, null, null, null);
   }
-}
\ No newline at end of file
+}
diff --git a/modules/angular2/src/change_detection/change_detector_ref.ts b/modules/angular2/src/change_detection/change_detector_ref.ts
index 735e319d54..bd6262eb65 100644
--- a/modules/angular2/src/change_detection/change_detector_ref.ts
+++ b/modules/angular2/src/change_detection/change_detector_ref.ts
@@ -16,14 +16,14 @@ export class ChangeDetectorRef {
   /**
    * Request to check all ON_PUSH ancestors.
    */
-  requestCheck() { this._cd.markPathToRootAsCheckOnce(); }
+  requestCheck(): void { this._cd.markPathToRootAsCheckOnce(); }
 
   /**
    * Detaches the change detector from the change detector tree.
    *
    * The detached change detector will not be checked until it is reattached.
    */
-  detach() { this._cd.mode = DETACHED; }
+  detach(): void { this._cd.mode = DETACHED; }
 
   /**
    * Reattach the change detector to the change detector tree.
@@ -32,7 +32,7 @@ export class ChangeDetectorRef {
    *checked during the
    * next change detection run.
    */
-  reattach() {
+  reattach(): void {
     this._cd.mode = CHECK_ALWAYS;
     this.requestCheck();
   }
diff --git a/modules/angular2/src/change_detection/coalesce.ts b/modules/angular2/src/change_detection/coalesce.ts
index f1d58205a0..faf37caf73 100644
--- a/modules/angular2/src/change_detection/coalesce.ts
+++ b/modules/angular2/src/change_detection/coalesce.ts
@@ -13,8 +13,8 @@ import {RecordType, ProtoRecord} from './proto_record';
  * replaced with very cheap SELF records.
  */
 export function coalesce(records: List<ProtoRecord>): List<ProtoRecord> {
-  var res = ListWrapper.create();
-  var indexMap = MapWrapper.create();
+  var res: List<ProtoRecord> = ListWrapper.create();
+  var indexMap: Map<number, number> = MapWrapper.create();
 
   for (var i = 0; i < records.length; ++i) {
     var r = records[i];
diff --git a/modules/angular2/src/change_detection/exceptions.ts b/modules/angular2/src/change_detection/exceptions.ts
index fbc34d8e7a..38aa43202f 100644
--- a/modules/angular2/src/change_detection/exceptions.ts
+++ b/modules/angular2/src/change_detection/exceptions.ts
@@ -16,12 +16,10 @@ export class ExpressionChangedAfterItHasBeenChecked extends BaseException {
 
 export class ChangeDetectionError extends BaseException {
   message: string;
-  originalException: any;
   location: string;
 
-  constructor(proto: ProtoRecord, originalException: any) {
+  constructor(proto: ProtoRecord, public originalException: any) {
     super();
-    this.originalException = originalException;
     this.location = proto.expressionAsString;
     this.message = `${this.originalException} in [${this.location}]`;
   }
diff --git a/modules/angular2/src/change_detection/interfaces.ts b/modules/angular2/src/change_detection/interfaces.ts
index 59e1fda40e..bc78fcefd5 100644
--- a/modules/angular2/src/change_detection/interfaces.ts
+++ b/modules/angular2/src/change_detection/interfaces.ts
@@ -47,17 +47,17 @@ export class ChangeDetector {
   parent: ChangeDetector;
   mode: string;
 
-  addChild(cd: ChangeDetector) {}
-  addShadowDomChild(cd: ChangeDetector) {}
-  removeChild(cd: ChangeDetector) {}
-  removeShadowDomChild(cd: ChangeDetector) {}
-  remove() {}
-  hydrate(context: any, locals: Locals, directives: any) {}
-  dehydrate() {}
-  markPathToRootAsCheckOnce() {}
+  addChild(cd: ChangeDetector): void {}
+  addShadowDomChild(cd: ChangeDetector): void {}
+  removeChild(cd: ChangeDetector): void {}
+  removeShadowDomChild(cd: ChangeDetector): void {}
+  remove(): void {}
+  hydrate(context: any, locals: Locals, directives: any): void {}
+  dehydrate(): void {}
+  markPathToRootAsCheckOnce(): void {}
 
-  detectChanges() {}
-  checkNoChanges() {}
+  detectChanges(): void {}
+  checkNoChanges(): void {}
 }
 
 export class ChangeDetectorDefinition {
diff --git a/modules/angular2/src/change_detection/parser/lexer.ts b/modules/angular2/src/change_detection/parser/lexer.ts
index 66d33c3e16..359b477e71 100644
--- a/modules/angular2/src/change_detection/parser/lexer.ts
+++ b/modules/angular2/src/change_detection/parser/lexer.ts
@@ -8,12 +8,12 @@ import {
   isPresent
 } from "angular2/src/facade/lang";
 
-export const TOKEN_TYPE_CHARACTER = 1;
-export const TOKEN_TYPE_IDENTIFIER = 2;
-export const TOKEN_TYPE_KEYWORD = 3;
-export const TOKEN_TYPE_STRING = 4;
-export const TOKEN_TYPE_OPERATOR = 5;
-export const TOKEN_TYPE_NUMBER = 6;
+const TOKEN_TYPE_CHARACTER = 1;
+const TOKEN_TYPE_IDENTIFIER = 2;
+const TOKEN_TYPE_KEYWORD = 3;
+const TOKEN_TYPE_STRING = 4;
+const TOKEN_TYPE_OPERATOR = 5;
+const TOKEN_TYPE_NUMBER = 6;
 
 @Injectable()
 export class Lexer {
@@ -160,24 +160,18 @@ const $NBSP = 160;
 
 
 export class ScannerError extends BaseException {
-  message: string;
-  constructor(message) {
-    super();
-    this.message = message;
-  }
+  constructor(public message) { super(); }
 
-  toString() { return this.message; }
+  toString(): string { return this.message; }
 }
 
 class _Scanner {
   length: number;
-  peek: number;
-  index: number;
+  peek: number = 0;
+  index: number = -1;
 
   constructor(public input: string) {
     this.length = input.length;
-    this.peek = 0;
-    this.index = -1;
     this.advance();
   }
 
diff --git a/modules/angular2/src/change_detection/parser/parser.ts b/modules/angular2/src/change_detection/parser/parser.ts
index 2452c8b6ac..a6446446ca 100644
--- a/modules/angular2/src/change_detection/parser/parser.ts
+++ b/modules/angular2/src/change_detection/parser/parser.ts
@@ -55,10 +55,9 @@ var INTERPOLATION_REGEXP = RegExpWrapper.create('\\{\\{(.*?)\\}\\}');
 
 @Injectable()
 export class Parser {
-  _lexer: Lexer;
   _reflector: Reflector;
-  constructor(lexer: Lexer, providedReflector: Reflector = null) {
-    this._lexer = lexer;
+
+  constructor(public _lexer: Lexer, providedReflector: Reflector = null) {
     this._reflector = isPresent(providedReflector) ? providedReflector : reflector;
   }
 
@@ -116,11 +115,9 @@ export class Parser {
 }
 
 class _ParseAST {
-  index: int;
+  index: int = 0;
   constructor(public input: string, public location: any, public tokens: List<any>,
-              public reflector: Reflector, public parseAction: boolean) {
-    this.index = 0;
-  }
+              public reflector: Reflector, public parseAction: boolean) {}
 
   peek(offset: int): Token {
     var i = this.index + offset;
diff --git a/modules/angular2/src/change_detection/pipes/iterable_changes.ts b/modules/angular2/src/change_detection/pipes/iterable_changes.ts
index 767d3f0314..a18db114e7 100644
--- a/modules/angular2/src/change_detection/pipes/iterable_changes.ts
+++ b/modules/angular2/src/change_detection/pipes/iterable_changes.ts
@@ -30,39 +30,23 @@ export class IterableChangesFactory extends PipeFactory {
  * @exportedAs angular2/pipes
  */
 export class IterableChanges extends Pipe {
-  private _collection;
-  private _length: int;
-  private _linkedRecords: _DuplicateMap;
-  private _unlinkedRecords: _DuplicateMap;
-  private _previousItHead: CollectionChangeRecord;
-  private _itHead: CollectionChangeRecord;
-  private _itTail: CollectionChangeRecord;
-  private _additionsHead: CollectionChangeRecord;
-  private _additionsTail: CollectionChangeRecord;
-  private _movesHead: CollectionChangeRecord;
-  private _movesTail: CollectionChangeRecord;
-  private _removalsHead: CollectionChangeRecord;
-  private _removalsTail: CollectionChangeRecord;
+  private _collection = null;
+  private _length: int = null;
+  // Keeps track of the used records at any point in time (during & across `_check()` calls)
+  private _linkedRecords: _DuplicateMap = null;
+  // Keeps track of the removed records at any point in time during `_check()` calls.
+  private _unlinkedRecords: _DuplicateMap = null;
+  private _previousItHead: CollectionChangeRecord = null;
+  private _itHead: CollectionChangeRecord = null;
+  private _itTail: CollectionChangeRecord = null;
+  private _additionsHead: CollectionChangeRecord = null;
+  private _additionsTail: CollectionChangeRecord = null;
+  private _movesHead: CollectionChangeRecord = null;
+  private _movesTail: CollectionChangeRecord = null;
+  private _removalsHead: CollectionChangeRecord = null;
+  private _removalsTail: CollectionChangeRecord = null;
 
-  constructor() {
-    super();
-    this._collection = null;
-    this._length = null;
-    /// Keeps track of the used records at any point in time (during & across `_check()` calls)
-    this._linkedRecords = null;
-    /// Keeps track of the removed records at any point in time during `_check()` calls.
-    this._unlinkedRecords = null;
-
-    this._previousItHead = null;
-    this._itHead = null;
-    this._itTail = null;
-    this._additionsHead = null;
-    this._additionsTail = null;
-    this._movesHead = null;
-    this._movesTail = null;
-    this._removalsHead = null;
-    this._removalsTail = null;
-  }
+  constructor() { super(); }
 
   static supportsObj(obj): boolean { return isListLikeIterable(obj); }
 
@@ -496,35 +480,20 @@ export class IterableChanges extends Pipe {
  * @exportedAs angular2/pipes
  */
 export class CollectionChangeRecord {
-  currentIndex: int;
-  previousIndex: int;
-  item;
+  currentIndex: int = null;
+  previousIndex: int = null;
 
-  _nextPrevious: CollectionChangeRecord;
-  _prev: CollectionChangeRecord;
-  _next: CollectionChangeRecord;
-  _prevDup: CollectionChangeRecord;
-  _nextDup: CollectionChangeRecord;
-  _prevRemoved: CollectionChangeRecord;
-  _nextRemoved: CollectionChangeRecord;
-  _nextAdded: CollectionChangeRecord;
-  _nextMoved: CollectionChangeRecord;
+  _nextPrevious: CollectionChangeRecord = null;
+  _prev: CollectionChangeRecord = null;
+  _next: CollectionChangeRecord = null;
+  _prevDup: CollectionChangeRecord = null;
+  _nextDup: CollectionChangeRecord = null;
+  _prevRemoved: CollectionChangeRecord = null;
+  _nextRemoved: CollectionChangeRecord = null;
+  _nextAdded: CollectionChangeRecord = null;
+  _nextMoved: CollectionChangeRecord = null;
 
-  constructor(item) {
-    this.currentIndex = null;
-    this.previousIndex = null;
-    this.item = item;
-
-    this._nextPrevious = null;
-    this._prev = null;
-    this._next = null;
-    this._prevDup = null;
-    this._nextDup = null;
-    this._prevRemoved = null;
-    this._nextRemoved = null;
-    this._nextAdded = null;
-    this._nextMoved = null;
-  }
+  constructor(public item: any) {}
 
   toString(): string {
     return this.previousIndex === this.currentIndex ?
@@ -536,20 +505,15 @@ export class CollectionChangeRecord {
 
 // A linked list of CollectionChangeRecords with the same CollectionChangeRecord.item
 class _DuplicateItemRecordList {
-  _head: CollectionChangeRecord;
-  _tail: CollectionChangeRecord;
-
-  constructor() {
-    this._head = null;
-    this._tail = null;
-  }
+  _head: CollectionChangeRecord = null;
+  _tail: CollectionChangeRecord = null;
 
   /**
    * Append the record to the list of duplicates.
    *
    * Note: by design all records in the list of duplicates hold the same value in record.item.
    */
-  add(record: CollectionChangeRecord) {
+  add(record: CollectionChangeRecord): void {
     if (this._head === null) {
       this._head = this._tail = record;
       record._nextDup = null;
@@ -610,8 +574,7 @@ class _DuplicateItemRecordList {
 }
 
 class _DuplicateMap {
-  map: Map<any, _DuplicateItemRecordList>;
-  constructor() { this.map = MapWrapper.create(); }
+  map: Map<any, _DuplicateItemRecordList> = MapWrapper.create();
 
   put(record: CollectionChangeRecord) {
     // todo(vicb) handle corner cases
diff --git a/modules/angular2/src/change_detection/pipes/keyvalue_changes.ts b/modules/angular2/src/change_detection/pipes/keyvalue_changes.ts
index 602da82bc4..ce98ef869d 100644
--- a/modules/angular2/src/change_detection/pipes/keyvalue_changes.ts
+++ b/modules/angular2/src/change_detection/pipes/keyvalue_changes.ts
@@ -19,28 +19,15 @@ export class KeyValueChangesFactory extends PipeFactory {
  * @exportedAs angular2/pipes
  */
 export class KeyValueChanges extends Pipe {
-  private _records: Map<any, any>;
-  private _mapHead: KVChangeRecord;
-  private _previousMapHead: KVChangeRecord;
-  private _changesHead: KVChangeRecord;
-  private _changesTail: KVChangeRecord;
-  private _additionsHead: KVChangeRecord;
-  private _additionsTail: KVChangeRecord;
-  private _removalsHead: KVChangeRecord;
-  private _removalsTail: KVChangeRecord;
-
-  constructor() {
-    super();
-    this._records = MapWrapper.create();
-    this._mapHead = null;
-    this._previousMapHead = null;
-    this._changesHead = null;
-    this._changesTail = null;
-    this._additionsHead = null;
-    this._additionsTail = null;
-    this._removalsHead = null;
-    this._removalsTail = null;
-  }
+  private _records: Map<any, any> = MapWrapper.create();
+  private _mapHead: KVChangeRecord = null;
+  private _previousMapHead: KVChangeRecord = null;
+  private _changesHead: KVChangeRecord = null;
+  private _changesTail: KVChangeRecord = null;
+  private _additionsHead: KVChangeRecord = null;
+  private _additionsTail: KVChangeRecord = null;
+  private _removalsHead: KVChangeRecord = null;
+  private _removalsTail: KVChangeRecord = null;
 
   static supportsObj(obj): boolean { return obj instanceof Map || isJsObject(obj); }
 
@@ -347,29 +334,17 @@ export class KeyValueChanges extends Pipe {
  * @exportedAs angular2/pipes
  */
 export class KVChangeRecord {
-  key;
-  previousValue;
-  currentValue;
+  previousValue: any = null;
+  currentValue: any = null;
 
-  _nextPrevious: KVChangeRecord;
-  _next: KVChangeRecord;
-  _nextAdded: KVChangeRecord;
-  _nextRemoved: KVChangeRecord;
-  _prevRemoved: KVChangeRecord;
-  _nextChanged: KVChangeRecord;
+  _nextPrevious: KVChangeRecord = null;
+  _next: KVChangeRecord = null;
+  _nextAdded: KVChangeRecord = null;
+  _nextRemoved: KVChangeRecord = null;
+  _prevRemoved: KVChangeRecord = null;
+  _nextChanged: KVChangeRecord = null;
 
-  constructor(key) {
-    this.key = key;
-    this.previousValue = null;
-    this.currentValue = null;
-
-    this._nextPrevious = null;
-    this._next = null;
-    this._nextAdded = null;
-    this._nextRemoved = null;
-    this._prevRemoved = null;
-    this._nextChanged = null;
-  }
+  constructor(public key: any) {}
 
   toString(): string {
     return looseIdentical(this.previousValue, this.currentValue) ?
diff --git a/modules/angular2/src/change_detection/pipes/lowercase_pipe.ts b/modules/angular2/src/change_detection/pipes/lowercase_pipe.ts
index 5df0190f15..578102508c 100644
--- a/modules/angular2/src/change_detection/pipes/lowercase_pipe.ts
+++ b/modules/angular2/src/change_detection/pipes/lowercase_pipe.ts
@@ -24,11 +24,8 @@ import {Pipe} from './pipe';
  * @exportedAs angular2/pipes
  */
 export class LowerCasePipe extends Pipe {
-  _latestValue: string;
-  constructor() {
-    super();
-    this._latestValue = null;
-  }
+  _latestValue: string = null;
+
   supports(str): boolean { return isString(str); }
 
   onDestroy(): void { this._latestValue = null; }
diff --git a/modules/angular2/src/change_detection/pipes/null_pipe.ts b/modules/angular2/src/change_detection/pipes/null_pipe.ts
index bebb3c86fe..e7e037ac7e 100644
--- a/modules/angular2/src/change_detection/pipes/null_pipe.ts
+++ b/modules/angular2/src/change_detection/pipes/null_pipe.ts
@@ -17,11 +17,7 @@ export class NullPipeFactory extends PipeFactory {
  * @exportedAs angular2/pipes
  */
 export class NullPipe extends Pipe {
-  called: boolean;
-  constructor() {
-    super();
-    this.called = false;
-  }
+  called: boolean = false;
 
   static supportsObj(obj): boolean { return isBlank(obj); }
 
diff --git a/modules/angular2/src/change_detection/pipes/observable_pipe.ts b/modules/angular2/src/change_detection/pipes/observable_pipe.ts
index 3d871f7fdc..2e775ed6a1 100644
--- a/modules/angular2/src/change_detection/pipes/observable_pipe.ts
+++ b/modules/angular2/src/change_detection/pipes/observable_pipe.ts
@@ -30,22 +30,13 @@ import {ChangeDetectorRef} from '../change_detector_ref';
  * @exportedAs angular2/pipes
  */
 export class ObservablePipe extends Pipe {
-  _ref: ChangeDetectorRef;
+  _latestValue: Object = null;
+  _latestReturnedValue: Object = null;
 
-  _latestValue: Object;
-  _latestReturnedValue: Object;
+  _subscription: Object = null;
+  _observable: Observable = null;
 
-  _subscription: Object;
-  _observable: Observable;
-
-  constructor(ref: ChangeDetectorRef) {
-    super();
-    this._ref = ref;
-    this._latestValue = null;
-    this._latestReturnedValue = null;
-    this._subscription = null;
-    this._observable = null;
-  }
+  constructor(public _ref: ChangeDetectorRef) { super(); }
 
   supports(obs): boolean { return ObservableWrapper.isObservable(obs); }
 
@@ -106,4 +97,4 @@ export class ObservablePipeFactory extends PipeFactory {
   supports(obs): boolean { return ObservableWrapper.isObservable(obs); }
 
   create(cdRef): Pipe { return new ObservablePipe(cdRef); }
-}
\ No newline at end of file
+}
diff --git a/modules/angular2/src/change_detection/pipes/promise_pipe.ts b/modules/angular2/src/change_detection/pipes/promise_pipe.ts
index 5048f7c7a6..95b0956f3c 100644
--- a/modules/angular2/src/change_detection/pipes/promise_pipe.ts
+++ b/modules/angular2/src/change_detection/pipes/promise_pipe.ts
@@ -29,17 +29,11 @@ import {ChangeDetectorRef} from '../change_detector_ref';
  * @exportedAs angular2/pipes
  */
 export class PromisePipe extends Pipe {
-  _ref: ChangeDetectorRef;
-  _latestValue: Object;
-  _latestReturnedValue: Object;
+  _latestValue: Object = null;
+  _latestReturnedValue: Object = null;
   _sourcePromise: Promise<any>;
 
-  constructor(ref: ChangeDetectorRef) {
-    super();
-    this._ref = ref;
-    this._latestValue = null;
-    this._latestReturnedValue = null;
-  }
+  constructor(public _ref: ChangeDetectorRef) { super(); }
 
   supports(promise): boolean { return isPromise(promise); }
 
diff --git a/modules/angular2/src/change_detection/pipes/uppercase_pipe.ts b/modules/angular2/src/change_detection/pipes/uppercase_pipe.ts
index 63b99365a5..58b193a4b2 100644
--- a/modules/angular2/src/change_detection/pipes/uppercase_pipe.ts
+++ b/modules/angular2/src/change_detection/pipes/uppercase_pipe.ts
@@ -24,11 +24,8 @@ import {Pipe} from './pipe';
  * @exportedAs angular2/pipes
  */
 export class UpperCasePipe extends Pipe {
-  _latestValue: string;
-  constructor() {
-    super();
-    this._latestValue = null;
-  }
+  _latestValue: string = null;
+
   supports(str): boolean { return isString(str); }
 
   onDestroy(): void { this._latestValue = null; }
diff --git a/modules/angular2/src/change_detection/pregen_proto_change_detector.ts b/modules/angular2/src/change_detection/pregen_proto_change_detector.ts
index c61d5392ad..e0020733c8 100644
--- a/modules/angular2/src/change_detection/pregen_proto_change_detector.ts
+++ b/modules/angular2/src/change_detection/pregen_proto_change_detector.ts
@@ -6,8 +6,6 @@ import {coalesce} from './coalesce';
 export {Function as PregenProtoChangeDetectorFactory};
 
 export class PregenProtoChangeDetector extends ProtoChangeDetector {
-  constructor() { super(); }
-
   static isSupported(): boolean { return false; }
 
   instantiate(dispatcher: any): ChangeDetector {