feat(core/linker): add SimpleChanges interface to lifecycle_hooks

modules/angular2/src/common/forms/directives/ng_control_name.ts

@@ -4,7 +4,7 @@ import {EventEmitter, ObservableWrapper} from 'angular2/src/facade/async';
 import {
   OnChanges,
   OnDestroy,
-  SimpleChange,
+  SimpleChanges,
   Query,
   Directive,
   forwardRef,
@@ -114,7 +114,7 @@ export class NgControlName extends NgControl implements OnChanges,
     this.valueAccessor = selectValueAccessor(this, valueAccessors);
   }
 
-  ngOnChanges(changes: {[key: string]: SimpleChange}) {
+  ngOnChanges(changes: SimpleChanges) {
     if (!this._added) {
       this.formDirective.addControl(this);
       this._added = true;

modules/angular2/src/common/forms/directives/ng_form_control.ts

@@ -3,7 +3,7 @@ import {StringMapWrapper} from 'angular2/src/facade/collection';
 import {EventEmitter, ObservableWrapper} from 'angular2/src/facade/async';
 import {
   OnChanges,
-  SimpleChange,
+  SimpleChanges,
   Query,
   Directive,
   forwardRef,
@@ -97,7 +97,7 @@ export class NgFormControl extends NgControl implements OnChanges {
     this.valueAccessor = selectValueAccessor(this, valueAccessors);
   }
 
-  ngOnChanges(changes: {[key: string]: SimpleChange}): void {
+  ngOnChanges(changes: SimpleChanges): void {
     if (this._isControlChanged(changes)) {
       setUpControl(this.form, this);
       this.form.updateValueAndValidity({emitEvent: false});

modules/angular2/src/common/forms/directives/ng_form_model.ts

@@ -2,7 +2,7 @@ import {CONST_EXPR} from 'angular2/src/facade/lang';
 import {ListWrapper, StringMapWrapper} from 'angular2/src/facade/collection';
 import {ObservableWrapper, EventEmitter} from 'angular2/src/facade/async';
 import {
-  SimpleChange,
+  SimpleChanges,
   OnChanges,
   Directive,
   forwardRef,
@@ -113,7 +113,7 @@ export class NgFormModel extends ControlContainer implements Form,
     super();
   }
 
-  ngOnChanges(changes: {[key: string]: SimpleChange}): void {
+  ngOnChanges(changes: SimpleChanges): void {
     if (StringMapWrapper.contains(changes, "form")) {
       var sync = composeValidators(this._validators);
       this.form.validator = Validators.compose([this.form.validator, sync]);

modules/angular2/src/common/forms/directives/ng_model.ts

@@ -2,7 +2,7 @@ import {CONST_EXPR} from 'angular2/src/facade/lang';
 import {EventEmitter, ObservableWrapper} from 'angular2/src/facade/async';
 import {
   OnChanges,
-  SimpleChange,
+  SimpleChanges,
   Query,
   Directive,
   forwardRef,
@@ -71,7 +71,7 @@ export class NgModel extends NgControl implements OnChanges {
     this.valueAccessor = selectValueAccessor(this, valueAccessors);
   }
 
-  ngOnChanges(changes: {[key: string]: SimpleChange}) {
+  ngOnChanges(changes: SimpleChanges) {
     if (!this._added) {
       setUpControl(this._control, this);
       this._control.updateValueAndValidity({emitEvent: false});

modules/angular2/src/core/linker.ts

@@ -7,7 +7,8 @@ export {
   OnChanges,
   OnDestroy,
   OnInit,
-  DoCheck
+  DoCheck,
+  SimpleChanges
 } from './linker/interfaces';
 export {DirectiveResolver} from './linker/directive_resolver';
 export {ViewResolver} from './linker/view_resolver';
@@ -19,4 +20,4 @@ export {ElementRef} from './linker/element_ref';
 export {TemplateRef} from './linker/template_ref';
 export {ViewRef, HostViewRef, ProtoViewRef} from './linker/view_ref';
 export {ViewContainerRef} from './linker/view_container_ref';
-export {ComponentRef} from './linker/dynamic_component_loader';
+export {ComponentRef} from './linker/dynamic_component_loader';

modules/angular2/src/core/linker/interfaces.ts

@@ -12,6 +12,12 @@ export enum LifecycleHooks {
   AfterViewChecked
 }
 
+/**
+ * A `changes` object whose keys are property names and
+ * values are instances of {@link SimpleChange}. See {@link OnChanges}
+ */
+export interface SimpleChanges {[propName: string]: SimpleChange};
+
 /**
  * @internal
  */
@@ -57,7 +63,7 @@ export var LIFECYCLE_HOOKS_VALUES = [
  * class MyComponent implements OnChanges {
  *   @Input() myProp: any;
  *
- *   ngOnChanges(changes: {[propName: string]: SimpleChange}) {
+ *   ngOnChanges(changes: SimpleChanges) {
  *     console.log('ngOnChanges - myProp = ' + changes['myProp'].currentValue);
  *   }
  * }
@@ -76,7 +82,7 @@ export var LIFECYCLE_HOOKS_VALUES = [
  * bootstrap(App).catch(err => console.error(err));
  * ```
  */
-export interface OnChanges { ngOnChanges(changes: {[key: string]: SimpleChange}); }
+export interface OnChanges { ngOnChanges(changes: SimpleChanges); }
 
 /**
  * Implement this interface to execute custom initialization logic after your directive's

modules/angular2/src/upgrade/downgrade_ng2_adapter.ts

@@ -6,7 +6,7 @@ import {
   Injector,
   OnChanges,
   ProtoViewRef,
-  SimpleChange
+  SimpleChanges
 } from 'angular2/core';
 import {NG1_SCOPE} from './constants';
 import {ComponentInfo} from './metadata';
@@ -20,7 +20,7 @@ const INITIAL_VALUE = {
 export class DowngradeNg2ComponentAdapter {
   component: any = null;
   inputChangeCount: number = 0;
-  inputChanges: {[key: string]: SimpleChange} = null;
+  inputChanges: SimpleChanges = null;
   hostViewRef: HostViewRef = null;
   changeDetector: ChangeDetectorRef = null;
   componentScope: angular.IScope;

modules/angular2/src/upgrade/upgrade_ng1_adapter.ts

@@ -6,6 +6,7 @@ import {
   Inject,
   OnChanges,
   SimpleChange,
+  SimpleChanges,
   Type
 } from 'angular2/core';
 import {
@@ -224,7 +225,7 @@ class UpgradeNg1ComponentAdapter implements OnChanges, DoCheck {
     }
   }
 
-  ngOnChanges(changes: {[name: string]: SimpleChange}) {
+  ngOnChanges(changes: SimpleChanges) {
     for (var name in changes) {
       if ((<Object>changes).hasOwnProperty(name)) {
         var change: SimpleChange = changes[name];

modules/angular2/test/compiler/runtime_metadata_spec.ts

@@ -30,7 +30,7 @@ import {
   AfterContentChecked,
   AfterViewInit,
   AfterViewChecked,
-  SimpleChange,
+  SimpleChanges,
   provide
 } from 'angular2/core';
 
@@ -136,7 +136,7 @@ class DirectiveWithoutModuleId {
 class ComponentWithEverything implements OnChanges,
     OnInit, DoCheck, OnDestroy, AfterContentInit, AfterContentChecked, AfterViewInit,
     AfterViewChecked {
-  ngOnChanges(changes: {[key: string]: SimpleChange}): void {}
+  ngOnChanges(changes: SimpleChanges): void {}
   ngOnInit(): void {}
   ngDoCheck(): void {}
   ngOnDestroy(): void {}