diff --git a/modules/@angular/compiler/src/metadata_resolver.ts b/modules/@angular/compiler/src/metadata_resolver.ts
index 97f750865b..4ced8d405c 100644
--- a/modules/@angular/compiler/src/metadata_resolver.ts
+++ b/modules/@angular/compiler/src/metadata_resolver.ts
@@ -37,7 +37,8 @@ export class CompileMetadataResolver {
   constructor(
       private _ngModuleResolver: NgModuleResolver, private _directiveResolver: DirectiveResolver,
       private _pipeResolver: PipeResolver, private _config: CompilerConfig,
-      private _console: Console, private _schemaRegistry: ElementSchemaRegistry, private _reflector: ReflectorReader = reflector) {}
+      private _console: Console, private _schemaRegistry: ElementSchemaRegistry,
+      private _reflector: ReflectorReader = reflector) {}
 
   private sanitizeTokenName(token: any): string {
     let identifier = stringify(token);
diff --git a/modules/@angular/core/src/metadata.ts b/modules/@angular/core/src/metadata.ts
index f7b792ac86..d8c053e3aa 100644
--- a/modules/@angular/core/src/metadata.ts
+++ b/modules/@angular/core/src/metadata.ts
@@ -15,14 +15,14 @@ import {ChangeDetectionStrategy} from '../src/change_detection/change_detection'
 
 import {AnimationEntryMetadata} from './animation/metadata';
 import {AttributeMetadata, ContentChildMetadata, ContentChildrenMetadata, QueryMetadata, ViewChildMetadata, ViewChildrenMetadata, ViewQueryMetadata} from './metadata/di';
-import {ComponentMetadata, DirectiveMetadata, HostBindingMetadata, HostListenerMetadata, InputMetadata, OutputMetadata, PipeMetadata} from './metadata/directives';
-import {ModuleWithProviders, NgModuleMetadata, SchemaMetadata} from './metadata/ng_module';
+import {ComponentMetadata, ComponentMetadataType, DirectiveMetadata, DirectiveMetadataType, HostBindingMetadata, HostListenerMetadata, InputMetadata, OutputMetadata, PipeMetadata, PipeMetadataType} from './metadata/directives';
+import {ModuleWithProviders, NgModuleMetadata, NgModuleMetadataType, SchemaMetadata} from './metadata/ng_module';
 import {ViewEncapsulation} from './metadata/view';
 
 export {ANALYZE_FOR_ENTRY_COMPONENTS, AttributeMetadata, ContentChildMetadata, ContentChildrenMetadata, QueryMetadata, ViewChildMetadata, ViewChildrenMetadata, ViewQueryMetadata} from './metadata/di';
-export {ComponentMetadata, DirectiveMetadata, HostBindingMetadata, HostListenerMetadata, InputMetadata, OutputMetadata, PipeMetadata} from './metadata/directives';
+export {ComponentMetadata, ComponentMetadataType, DirectiveMetadata, DirectiveMetadataType, HostBindingMetadata, HostListenerMetadata, InputMetadata, OutputMetadata, PipeMetadata, PipeMetadataType} from './metadata/directives';
 export {AfterContentChecked, AfterContentInit, AfterViewChecked, AfterViewInit, DoCheck, OnChanges, OnDestroy, OnInit} from './metadata/lifecycle_hooks';
-export {CUSTOM_ELEMENTS_SCHEMA, ModuleWithProviders, NgModuleMetadata, SchemaMetadata} from './metadata/ng_module';
+export {CUSTOM_ELEMENTS_SCHEMA, ModuleWithProviders, NgModuleMetadata, NgModuleMetadataType, SchemaMetadata} from './metadata/ng_module';
 export {ViewEncapsulation, ViewMetadata} from './metadata/view';
 
 import {makeDecorator, makeParamDecorator, makePropDecorator, TypeDecorator,} from './util/decorators';
@@ -90,28 +90,8 @@ export interface NgModuleDecorator extends TypeDecorator {}
  * @stable
  */
 export interface DirectiveMetadataFactory {
-  (obj: {
-    selector?: string,
-    inputs?: string[],
-    outputs?: string[],
-    properties?: string[],
-    events?: string[],
-    host?: {[key: string]: string},
-    providers?: any[],
-    exportAs?: string,
-    queries?: {[key: string]: any}
-  }): DirectiveDecorator;
-  new (obj: {
-    selector?: string,
-    inputs?: string[],
-    outputs?: string[],
-    properties?: string[],
-    events?: string[],
-    host?: {[key: string]: string},
-    providers?: any[],
-    exportAs?: string,
-    queries?: {[key: string]: any}
-  }): DirectiveMetadata;
+  (obj: DirectiveMetadataType): DirectiveDecorator;
+  new (obj: DirectiveMetadataType): DirectiveMetadata;
 }
 
 /**
@@ -148,54 +128,8 @@ export interface DirectiveMetadataFactory {
  * @stable
  */
 export interface ComponentMetadataFactory {
-  (obj: {
-    selector?: string,
-    inputs?: string[],
-    outputs?: string[],
-    properties?: string[],
-    events?: string[],
-    host?: {[key: string]: string},
-    providers?: any[],
-    exportAs?: string,
-    moduleId?: string,
-    queries?: {[key: string]: any},
-    viewProviders?: any[],
-    changeDetection?: ChangeDetectionStrategy,
-    templateUrl?: string,
-    template?: string,
-    styleUrls?: string[],
-    styles?: string[],
-    animations?: AnimationEntryMetadata[],
-    directives?: Array<Type|any[]>,
-    pipes?: Array<Type|any[]>,
-    encapsulation?: ViewEncapsulation,
-    interpolation?: [string, string],
-    entryComponents?: Array<Type|any[]>
-  }): ComponentDecorator;
-  new (obj: {
-    selector?: string,
-    inputs?: string[],
-    outputs?: string[],
-    properties?: string[],
-    events?: string[],
-    host?: {[key: string]: string},
-    providers?: any[],
-    exportAs?: string,
-    moduleId?: string,
-    queries?: {[key: string]: any},
-    viewProviders?: any[],
-    changeDetection?: ChangeDetectionStrategy,
-    templateUrl?: string,
-    template?: string,
-    styleUrls?: string[],
-    styles?: string[],
-    animations?: AnimationEntryMetadata[],
-    directives?: Array<Type|any[]>,
-    pipes?: Array<Type|any[]>,
-    encapsulation?: ViewEncapsulation,
-    interpolation?: [string, string],
-    entryComponents?: Array<Type|any[]>
-  }): ComponentMetadata;
+  (obj: ComponentMetadataType): ComponentDecorator;
+  new (obj: ComponentMetadataType): ComponentMetadata;
 }
 
 /**
@@ -337,8 +271,8 @@ export interface ViewChildMetadataFactory {
  * @stable
  */
 export interface PipeMetadataFactory {
-  (obj: {name: string, pure?: boolean}): any;
-  new (obj: {name: string, pure?: boolean}): any;
+  (obj: PipeMetadataType): any;
+  new (obj: PipeMetadataType): any;
 }
 
 /**
@@ -387,22 +321,8 @@ export interface HostListenerMetadataFactory {
  * @experimental
  */
 export interface NgModuleMetadataFactory {
-  (obj?: {
-    providers?: any[],
-    declarations?: Array<Type|any[]>,
-    imports?: Array<Type|ModuleWithProviders|any[]>,
-    exports?: Array<Type|any[]>,
-    entryComponents?: Array<Type|any[]>,
-    schemas?: Array<SchemaMetadata|any[]>
-  }): NgModuleDecorator;
-  new (obj?: {
-    providers?: any[],
-    declarations?: Array<Type|any[]>,
-    imports?: Array<Type|any[]>,
-    exports?: Array<Type|any[]>,
-    entryComponents?: Array<Type|any[]>,
-    schemas?: Array<SchemaMetadata|any[]>
-  }): NgModuleMetadata;
+  (obj?: NgModuleMetadataType): NgModuleDecorator;
+  new (obj?: NgModuleMetadataType): NgModuleMetadata;
 }
 
 // TODO(alexeagle): remove the duplication of this doc. It is copied from ComponentMetadata.
diff --git a/modules/@angular/core/src/metadata/directives.ts b/modules/@angular/core/src/metadata/directives.ts
index 056e0ffc27..673ef3e67c 100644
--- a/modules/@angular/core/src/metadata/directives.ts
+++ b/modules/@angular/core/src/metadata/directives.ts
@@ -13,6 +13,21 @@ import {Type, isPresent} from '../facade/lang';
 
 import {ViewEncapsulation} from './view';
 
+/**
+ * Interface for creating {@link DirectiveMetadata}
+ * @experimental
+ */
+export interface DirectiveMetadataType {
+  selector?: string;
+  properties?: string[];
+  inputs?: string[];
+  events?: string[];
+  outputs?: string[];
+  host?: {[key: string]: string};
+  providers?: any[];
+  exportAs?: string;
+  queries?: {[key: string]: any};
+}
 
 /**
  * Directives allow you to attach behavior to elements in the DOM.
@@ -396,7 +411,7 @@ import {ViewEncapsulation} from './view';
  * @ts2dart_const
  * @stable
  */
-export class DirectiveMetadata extends InjectableMetadata {
+export class DirectiveMetadata extends InjectableMetadata implements DirectiveMetadataType {
   /**
    * The CSS selector that triggers the instantiation of a directive.
    *
@@ -749,17 +764,9 @@ export class DirectiveMetadata extends InjectableMetadata {
    */
   queries: {[key: string]: any};
 
-  constructor({selector, inputs, outputs, properties, events, host, providers, exportAs, queries}: {
-    selector?: string,
-    inputs?: string[],
-    outputs?: string[],
-    /** @deprecated */ properties?: string[],
-    /** @deprecated */ events?: string[],
-    host?: {[key: string]: string},
-    providers?: any[],
-    exportAs?: string,
-    queries?: {[key: string]: any}
-  } = {}) {
+  constructor(
+      {selector, inputs, outputs, properties, events, host, providers, exportAs,
+       queries}: DirectiveMetadataType = {}) {
     super();
     this.selector = selector;
     this._inputs = inputs;
@@ -773,6 +780,26 @@ export class DirectiveMetadata extends InjectableMetadata {
   }
 }
 
+/**
+ * Interface for creating {@link ComponentMetadataType}
+ * @experimental
+ */
+export interface ComponentMetadataType extends DirectiveMetadataType {
+  changeDetection?: ChangeDetectionStrategy;
+  viewProviders?: any[];
+  moduleId?: string;
+  templateUrl?: string;
+  template?: string;
+  styleUrls?: string[];
+  styles?: string[];
+  animations?: AnimationEntryMetadata[];
+  directives?: Array<Type|any[]>;
+  pipes?: Array<Type|any[]>;
+  encapsulation?: ViewEncapsulation;
+  interpolation?: [string, string];
+  entryComponents?: Array<Type|any[]>;
+}
+
 /**
  * Declare reusable UI building blocks for an application.
  *
@@ -800,7 +827,7 @@ export class DirectiveMetadata extends InjectableMetadata {
  * @ts2dart_const
  * @stable
  */
-export class ComponentMetadata extends DirectiveMetadata {
+export class ComponentMetadata extends DirectiveMetadata implements ComponentMetadataType {
   /**
    * Defines the used change detection strategy.
    *
@@ -999,36 +1026,28 @@ export class ComponentMetadata extends DirectiveMetadata {
    */
   entryComponents: Array<Type|any[]>;
 
-  constructor(
-      {selector, inputs, outputs, properties, events, host, exportAs, moduleId, providers,
-       viewProviders, changeDetection = ChangeDetectionStrategy.Default, queries, templateUrl,
-       template, styleUrls, styles, animations, directives, pipes, encapsulation, interpolation,
-       /** @deprecated use entryComponents instead! */
-       precompile, entryComponents}: {
-        selector?: string,
-        inputs?: string[],
-        outputs?: string[],
-        /** @deprecated */ properties?: string[],
-        /** @deprecated */ events?: string[],
-        host?: {[key: string]: string},
-        providers?: any[],
-        exportAs?: string,
-        moduleId?: string,
-        viewProviders?: any[],
-        queries?: {[key: string]: any},
-        changeDetection?: ChangeDetectionStrategy,
-        templateUrl?: string,
-        template?: string,
-        styleUrls?: string[],
-        styles?: string[],
-        animations?: AnimationEntryMetadata[],
-        directives?: Array<Type|any[]>,
-        pipes?: Array<Type|any[]>,
-        encapsulation?: ViewEncapsulation,
-        interpolation?: [string, string],
-        precompile?: Array<Type|any[]>,
-        entryComponents?: Array<Type|any[]>
-      } = {}) {
+  constructor({selector,
+               inputs,
+               outputs,
+               properties,
+               events,
+               host,
+               exportAs,
+               moduleId,
+               providers,
+               viewProviders,
+               changeDetection = ChangeDetectionStrategy.Default,
+               queries,
+               templateUrl,
+               template,
+               styleUrls,
+               styles,
+               animations,
+               directives,
+               pipes,
+               encapsulation,
+               interpolation,
+               entryComponents}: ComponentMetadataType = {}) {
     super({
       selector: selector,
       inputs: inputs,
@@ -1053,10 +1072,19 @@ export class ComponentMetadata extends DirectiveMetadata {
     this.moduleId = moduleId;
     this.animations = animations;
     this.interpolation = interpolation;
-    this.entryComponents = precompile ? precompile : entryComponents;
+    this.entryComponents = entryComponents;
   }
 }
 
+/**
+ * Interface for creating {@link PipeMetadata}
+ * @experimental
+ */
+export interface PipeMetadataType {
+  name: string;
+  pure?: boolean;
+}
+
 /**
  * Declare reusable pipe function.
  *
@@ -1070,12 +1098,12 @@ export class ComponentMetadata extends DirectiveMetadata {
  * @ts2dart_const
  * @stable
  */
-export class PipeMetadata extends InjectableMetadata {
+export class PipeMetadata extends InjectableMetadata implements PipeMetadataType {
   name: string;
   /** @internal */
   _pure: boolean;
 
-  constructor({name, pure}: {name: string, pure?: boolean}) {
+  constructor({name, pure}: PipeMetadataType) {
     super();
     this.name = name;
     this._pure = pure;
diff --git a/modules/@angular/core/src/metadata/ng_module.ts b/modules/@angular/core/src/metadata/ng_module.ts
index 8c131761f5..8f080c9c51 100644
--- a/modules/@angular/core/src/metadata/ng_module.ts
+++ b/modules/@angular/core/src/metadata/ng_module.ts
@@ -36,11 +36,24 @@ export const CUSTOM_ELEMENTS_SCHEMA: SchemaMetadata = {
   name: 'custom-elements'
 };
 
+/**
+ * Interface for creating {@link NgModuleMetadata}
+ * @experimental
+ */
+export interface NgModuleMetadataType {
+  providers?: any[];
+  declarations?: Array<Type|any[]>;
+  imports?: Array<Type|ModuleWithProviders|any[]>;
+  exports?: Array<Type|any[]>;
+  entryComponents?: Array<Type|any[]>;
+  schemas?: Array<SchemaMetadata|any[]>;
+}
+
 /**
  * Declares an Angular Module.
  * @experimental
  */
-export class NgModuleMetadata extends InjectableMetadata {
+export class NgModuleMetadata extends InjectableMetadata implements NgModuleMetadataType {
   /**
    * Defines the set of injectable objects that are available in the injector
    * of this module.
@@ -133,14 +146,9 @@ export class NgModuleMetadata extends InjectableMetadata {
 
   schemas: Array<SchemaMetadata|any[]>;
 
-  constructor({providers, declarations, imports, exports, entryComponents, schemas}: {
-    providers?: any[],
-    declarations?: Array<Type|any[]>,
-    imports?: Array<Type|any[]>,
-    exports?: Array<Type|any[]>,
-    entryComponents?: Array<Type|any[]>,
-    schemas?: Array<SchemaMetadata|any[]>
-  } = {}) {
+  constructor(
+      {providers, declarations, imports, exports, entryComponents,
+       schemas}: NgModuleMetadataType = {}) {
     super();
     this._providers = providers;
     this.declarations = declarations;