diff --git a/modules/@angular/compiler/src/compile_metadata.ts b/modules/@angular/compiler/src/compile_metadata.ts
index 7d35b3196a..7045037543 100644
--- a/modules/@angular/compiler/src/compile_metadata.ts
+++ b/modules/@angular/compiler/src/compile_metadata.ts
@@ -15,10 +15,6 @@ import {LifecycleHooks, reflector} from './private_import_core';
 import {CssSelector} from './selector';
 import {splitAtColon} from './util';
 
-function unimplemented(): any {
-  throw new Error('unimplemented');
-}
-
 // group 0: "[prop] or (event) or @trigger"
 // group 1: "prop" from "[prop]"
 // group 2: "event" from "(event)"
diff --git a/modules/@angular/compiler/src/config.ts b/modules/@angular/compiler/src/config.ts
index a81ec90fa3..c88ebdfb90 100644
--- a/modules/@angular/compiler/src/config.ts
+++ b/modules/@angular/compiler/src/config.ts
@@ -11,10 +11,6 @@ import {MissingTranslationStrategy, ViewEncapsulation, isDevMode} from '@angular
 import {CompileIdentifierMetadata} from './compile_metadata';
 import {Identifiers, createIdentifier} from './identifiers';
 
-function unimplemented(): any {
-  throw new Error('unimplemented');
-}
-
 export class CompilerConfig {
   public renderTypes: RenderTypes;
   public defaultEncapsulation: ViewEncapsulation;
@@ -55,12 +51,12 @@ export class CompilerConfig {
  * to help tree shaking.
  */
 export abstract class RenderTypes {
-  get renderer(): CompileIdentifierMetadata { return unimplemented(); }
-  get renderText(): CompileIdentifierMetadata { return unimplemented(); }
-  get renderElement(): CompileIdentifierMetadata { return unimplemented(); }
-  get renderComment(): CompileIdentifierMetadata { return unimplemented(); }
-  get renderNode(): CompileIdentifierMetadata { return unimplemented(); }
-  get renderEvent(): CompileIdentifierMetadata { return unimplemented(); }
+  abstract get renderer(): CompileIdentifierMetadata;
+  abstract get renderText(): CompileIdentifierMetadata;
+  abstract get renderElement(): CompileIdentifierMetadata;
+  abstract get renderComment(): CompileIdentifierMetadata;
+  abstract get renderNode(): CompileIdentifierMetadata;
+  abstract get renderEvent(): CompileIdentifierMetadata;
 }
 
 export class DefaultRenderTypes implements RenderTypes {
diff --git a/modules/@angular/core/src/application_ref.ts b/modules/@angular/core/src/application_ref.ts
index 802655731a..6c4ea5a649 100644
--- a/modules/@angular/core/src/application_ref.ts
+++ b/modules/@angular/core/src/application_ref.ts
@@ -8,7 +8,6 @@
 
 import {ErrorHandler} from '../src/error_handler';
 import {ListWrapper} from '../src/facade/collection';
-import {unimplemented} from '../src/facade/errors';
 import {stringify} from '../src/facade/lang';
 import {isPromise} from '../src/util/lang';
 
@@ -185,9 +184,7 @@ export abstract class PlatformRef {
    *
    * @experimental APIs related to application bootstrap are currently under review.
    */
-  bootstrapModuleFactory<M>(moduleFactory: NgModuleFactory<M>): Promise<NgModuleRef<M>> {
-    throw unimplemented();
-  }
+  abstract bootstrapModuleFactory<M>(moduleFactory: NgModuleFactory<M>): Promise<NgModuleRef<M>>;
 
   /**
    * Creates an instance of an `@NgModule` for a given platform using the given runtime compiler.
@@ -217,14 +214,14 @@ export abstract class PlatformRef {
    * Retrieve the platform {@link Injector}, which is the parent injector for
    * every Angular application on the page and provides singleton providers.
    */
-  get injector(): Injector { throw unimplemented(); };
+  abstract get injector(): Injector;
 
   /**
    * Destroy the Angular platform and all Angular applications on the page.
    */
   abstract destroy(): void;
 
-  get destroyed(): boolean { throw unimplemented(); }
+  abstract get destroyed(): boolean;
 }
 
 function _callAndReportToErrorHandler(errorHandler: ErrorHandler, callback: () => any): any {
@@ -381,29 +378,29 @@ export abstract class ApplicationRef {
    * Get a list of component types registered to this application.
    * This list is populated even before the component is created.
    */
-  get componentTypes(): Type<any>[] { return <Type<any>[]>unimplemented(); };
+  abstract get componentTypes(): Type<any>[];
 
   /**
    * Get a list of components registered to this application.
    */
-  get components(): ComponentRef<any>[] { return <ComponentRef<any>[]>unimplemented(); };
+  abstract get components(): ComponentRef<any>[];
 
   /**
    * Attaches a view so that it will be dirty checked.
    * The view will be automatically detached when it is destroyed.
    * This will throw if the view is already attached to a ViewContainer.
    */
-  attachView(view: ViewRef): void { unimplemented(); }
+  abstract attachView(view: ViewRef): void;
 
   /**
    * Detaches a view from dirty checking again.
    */
-  detachView(view: ViewRef): void { unimplemented(); }
+  abstract detachView(view: ViewRef): void;
 
   /**
    * Returns the number of attached views.
    */
-  get viewCount() { return unimplemented(); }
+  abstract get viewCount(): number;
 }
 
 @Injectable()
diff --git a/modules/@angular/core/src/di/injector.ts b/modules/@angular/core/src/di/injector.ts
index 1b7eeb61f5..a587d5f747 100644
--- a/modules/@angular/core/src/di/injector.ts
+++ b/modules/@angular/core/src/di/injector.ts
@@ -6,7 +6,6 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {unimplemented} from '../facade/errors';
 import {stringify} from '../facade/lang';
 import {Type} from '../type';
 
@@ -55,10 +54,9 @@ export abstract class Injector {
    * Injector.THROW_IF_NOT_FOUND is given
    * - Returns the `notFoundValue` otherwise
    */
-  get<T>(token: Type<T>|InjectionToken<T>, notFoundValue?: T): T;
+  abstract get<T>(token: Type<T>|InjectionToken<T>, notFoundValue?: T): T;
   /**
    * @deprecated from v4.0.0 use Type<T> or InjectToken<T>
    */
-  get(token: any, notFoundValue?: any): any;
-  get(token: any, notFoundValue?: any): any { return unimplemented(); }
+  abstract get(token: any, notFoundValue?: any): any;
 }
diff --git a/modules/@angular/core/src/di/reflective_injector.ts b/modules/@angular/core/src/di/reflective_injector.ts
index cc4f4bf05b..d64fb0f0ca 100644
--- a/modules/@angular/core/src/di/reflective_injector.ts
+++ b/modules/@angular/core/src/di/reflective_injector.ts
@@ -6,7 +6,6 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {unimplemented} from '../facade/errors';
 import {Type} from '../type';
 
 import {Injector, THROW_IF_NOT_FOUND} from './injector';
@@ -467,7 +466,7 @@ export abstract class ReflectiveInjector implements Injector {
    * expect(child.parent).toBe(parent);
    * ```
    */
-  get parent(): Injector { return unimplemented(); }
+  abstract get parent(): Injector;
 
   /**
    * Resolves an array of providers and creates a child injector from those providers.
@@ -496,7 +495,7 @@ export abstract class ReflectiveInjector implements Injector {
    * because it needs to resolve the passed-in providers first.
    * See {@link Injector#resolve} and {@link Injector#createChildFromResolved}.
    */
-  resolveAndCreateChild(providers: Provider[]): ReflectiveInjector { return unimplemented(); }
+  abstract resolveAndCreateChild(providers: Provider[]): ReflectiveInjector;
 
   /**
    * Creates a child injector from previously resolved providers.
@@ -549,7 +548,7 @@ export abstract class ReflectiveInjector implements Injector {
    * expect(car).not.toBe(injector.resolveAndInstantiate(Car));
    * ```
    */
-  resolveAndInstantiate(provider: Provider): any { return unimplemented(); }
+  abstract resolveAndInstantiate(provider: Provider): any;
 
   /**
    * Instantiates an object using a resolved provider in the context of the injector.
@@ -575,7 +574,7 @@ export abstract class ReflectiveInjector implements Injector {
    * expect(car).not.toBe(injector.instantiateResolved(carProvider));
    * ```
    */
-  instantiateResolved(provider: ResolvedReflectiveProvider): any { return unimplemented(); }
+  abstract instantiateResolved(provider: ResolvedReflectiveProvider): any;
 
   abstract get(token: any, notFoundValue?: any): any;
 }
diff --git a/modules/@angular/core/src/linker/component_factory.ts b/modules/@angular/core/src/linker/component_factory.ts
index 8789c40c58..b8ef639bd6 100644
--- a/modules/@angular/core/src/linker/component_factory.ts
+++ b/modules/@angular/core/src/linker/component_factory.ts
@@ -8,7 +8,6 @@
 
 import {ChangeDetectorRef} from '../change_detection/change_detection';
 import {Injector} from '../di/injector';
-import {unimplemented} from '../facade/errors';
 import {Type} from '../type';
 
 import {ElementRef} from './element_ref';
@@ -30,32 +29,32 @@ export abstract class ComponentRef<C> {
   /**
    * Location of the Host Element of this Component Instance.
    */
-  get location(): ElementRef { return unimplemented(); }
+  abstract get location(): ElementRef;
 
   /**
    * The injector on which the component instance exists.
    */
-  get injector(): Injector { return unimplemented(); }
+  abstract get injector(): Injector;
 
   /**
    * The instance of the Component.
    */
-  get instance(): C { return unimplemented(); };
+  abstract get instance(): C;
 
   /**
    * The {@link ViewRef} of the Host View of this Component instance.
    */
-  get hostView(): ViewRef { return unimplemented(); };
+  abstract get hostView(): ViewRef;
 
   /**
    * The {@link ChangeDetectorRef} of the Component instance.
    */
-  get changeDetectorRef(): ChangeDetectorRef { return unimplemented(); }
+  abstract get changeDetectorRef(): ChangeDetectorRef;
 
   /**
    * The component type.
    */
-  get componentType(): Type<any> { return unimplemented(); }
+  abstract get componentType(): Type<any>;
 
   /**
    * Destroys the component instance and all of the data structures associated with it.
diff --git a/modules/@angular/core/src/linker/ng_module_factory.ts b/modules/@angular/core/src/linker/ng_module_factory.ts
index 3529e58e01..d6700fd67a 100644
--- a/modules/@angular/core/src/linker/ng_module_factory.ts
+++ b/modules/@angular/core/src/linker/ng_module_factory.ts
@@ -7,7 +7,6 @@
  */
 
 import {Injector, THROW_IF_NOT_FOUND} from '../di/injector';
-import {unimplemented} from '../facade/errors';
 import {stringify} from '../facade/lang';
 import {Type} from '../type';
 import {ComponentFactory} from './component_factory';
@@ -27,18 +26,18 @@ export abstract class NgModuleRef<T> {
   /**
    * The injector that contains all of the providers of the NgModule.
    */
-  get injector(): Injector { return unimplemented(); }
+  abstract get injector(): Injector;
 
   /**
    * The ComponentFactoryResolver to get hold of the ComponentFactories
    * declared in the `entryComponents` property of the module.
    */
-  get componentFactoryResolver(): ComponentFactoryResolver { return unimplemented(); }
+  abstract get componentFactoryResolver(): ComponentFactoryResolver;
 
   /**
    * The NgModule instance.
    */
-  get instance(): T { return unimplemented(); }
+  abstract get instance(): T;
 
   /**
    * Destroys the module instance and all of the data structures associated with it.
diff --git a/modules/@angular/core/src/linker/template_ref.ts b/modules/@angular/core/src/linker/template_ref.ts
index ab5704ae68..cdeb9235da 100644
--- a/modules/@angular/core/src/linker/template_ref.ts
+++ b/modules/@angular/core/src/linker/template_ref.ts
@@ -37,7 +37,7 @@ export abstract class TemplateRef<C> {
    *
    */
   // TODO(i): rename to anchor or location
-  get elementRef(): ElementRef { return null; }
+  abstract get elementRef(): ElementRef;
 
   abstract createEmbeddedView(context: C): EmbeddedViewRef<C>;
 }
diff --git a/modules/@angular/core/src/linker/view_container_ref.ts b/modules/@angular/core/src/linker/view_container_ref.ts
index dee90ee245..d21ff0f669 100644
--- a/modules/@angular/core/src/linker/view_container_ref.ts
+++ b/modules/@angular/core/src/linker/view_container_ref.ts
@@ -7,7 +7,6 @@
  */
 
 import {Injector} from '../di/injector';
-import {unimplemented} from '../facade/errors';
 import {isPresent} from '../facade/lang';
 import {WtfScopeFn, wtfCreateScope, wtfLeave} from '../profile/profile';
 
@@ -42,11 +41,11 @@ export abstract class ViewContainerRef {
    * Anchor element that specifies the location of this container in the containing View.
    * <!-- TODO: rename to anchorElement -->
    */
-  get element(): ElementRef { return <ElementRef>unimplemented(); }
+  abstract get element(): ElementRef;
 
-  get injector(): Injector { return <Injector>unimplemented(); }
+  abstract get injector(): Injector;
 
-  get parentInjector(): Injector { return <Injector>unimplemented(); }
+  abstract get parentInjector(): Injector;
 
   /**
    * Destroys all Views in this container.
@@ -61,7 +60,7 @@ export abstract class ViewContainerRef {
   /**
    * Returns the number of Views currently attached to this container.
    */
-  get length(): number { return <number>unimplemented(); };
+  abstract get length(): number;
 
   /**
    * Instantiates an Embedded View based on the {@link TemplateRef `templateRef`} and inserts it
diff --git a/modules/@angular/core/src/linker/view_ref.ts b/modules/@angular/core/src/linker/view_ref.ts
index 0264627b97..1df1318bf9 100644
--- a/modules/@angular/core/src/linker/view_ref.ts
+++ b/modules/@angular/core/src/linker/view_ref.ts
@@ -9,7 +9,6 @@
 import {AnimationQueue} from '../animation/animation_queue';
 import {ChangeDetectorRef} from '../change_detection/change_detector_ref';
 import {ChangeDetectorStatus} from '../change_detection/constants';
-import {unimplemented} from '../facade/errors';
 import {AppView} from './view';
 
 /**
@@ -21,7 +20,7 @@ export abstract class ViewRef extends ChangeDetectorRef {
    */
   abstract destroy(): void;
 
-  get destroyed(): boolean { return <boolean>unimplemented(); }
+  abstract get destroyed(): boolean;
 
   abstract onDestroy(callback: Function): any /** TODO #9100 */;
 }
@@ -81,9 +80,9 @@ export abstract class ViewRef extends ChangeDetectorRef {
  * @experimental
  */
 export abstract class EmbeddedViewRef<C> extends ViewRef {
-  get context(): C { return unimplemented(); }
+  abstract get context(): C;
 
-  get rootNodes(): any[] { return <any[]>unimplemented(); };
+  abstract get rootNodes(): any[];
 }
 
 export class ViewRef_<C> implements EmbeddedViewRef<C>, ChangeDetectorRef {
diff --git a/modules/@angular/core/src/render/api.ts b/modules/@angular/core/src/render/api.ts
index cb70bdb3c9..e22de06fe3 100644
--- a/modules/@angular/core/src/render/api.ts
+++ b/modules/@angular/core/src/render/api.ts
@@ -10,7 +10,6 @@ import {AnimationKeyframe} from '../../src/animation/animation_keyframe';
 import {AnimationPlayer} from '../../src/animation/animation_player';
 import {AnimationStyles} from '../../src/animation/animation_styles';
 import {Injector} from '../di/injector';
-import {unimplemented} from '../facade/errors';
 import {ViewEncapsulation} from '../metadata/view';
 
 /**
@@ -25,12 +24,12 @@ export class RenderComponentType {
 }
 
 export abstract class RenderDebugInfo {
-  get injector(): Injector { return unimplemented(); }
-  get component(): any { return unimplemented(); }
-  get providerTokens(): any[] { return unimplemented(); }
-  get references(): {[key: string]: any} { return unimplemented(); }
-  get context(): any { return unimplemented(); }
-  get source(): string { return unimplemented(); }
+  abstract get injector(): Injector;
+  abstract get component(): any;
+  abstract get providerTokens(): any[];
+  abstract get references(): {[key: string]: any};
+  abstract get context(): any;
+  abstract get source(): string;
 }
 
 export interface DirectRenderer {