TypeScript upgrade.downgradeComponent函数代码示例

    it('should instantiate ng2 in ng1 template and project content', async(() => {

         // the ng2 component that will be used in ng1 (downgraded)
         @Component({selector: 'ng2', template: `{{ 'NG2' }}(<ng-content></ng-content>)`})
         class Ng2Component {
         }

         // our upgrade module to host the component to downgrade
         @NgModule({
           imports: [BrowserModule, UpgradeModule],
           declarations: [Ng2Component],
           entryComponents: [Ng2Component]
         })
         class Ng2Module {
           ngDoBootstrap() {}
         }

         // the ng1 app module that will consume the downgraded component
         const ng1Module = angular
                               .module('ng1', [])
                               // create an ng1 facade of the ng2 component
                               .directive('ng2', downgradeComponent({component: Ng2Component}));

         const element =
             html('<div>{{ \'ng1[\' }}<ng2>~{{ \'ng-content\' }}~</ng2>{{ \']\' }}</div>');

         bootstrap(platformBrowserDynamic(), Ng2Module, element, ng1Module).then((upgrade) => {
           expect(document.body.textContent).toEqual('ng1[NG2(~ng-content~)]');
         });
       }));

    it('should interleave scope and component expressions', async(() => {
         const log: any[] /** TODO #9100 */ = [];
         const l = (value: any /** TODO #9100 */) => {
           log.push(value);
           return value + ';';
         };

         @Directive({selector: 'ng1a'})
         class Ng1aComponent extends UpgradeComponent {
           constructor(elementRef: ElementRef, injector: Injector) {
             super('ng1a', elementRef, injector);
           }
         }

         @Directive({selector: 'ng1b'})
         class Ng1bComponent extends UpgradeComponent {
           constructor(elementRef: ElementRef, injector: Injector) {
             super('ng1b', elementRef, injector);
           }
         }

         @Component({
           selector: 'ng2',
           template: `{{l('2A')}}<ng1a></ng1a>{{l('2B')}}<ng1b></ng1b>{{l('2C')}}`
         })
         class Ng2Component {
           l: (value: any) => string;
           constructor() { this.l = l; }
         }

         @NgModule({
           declarations: [Ng1aComponent, Ng1bComponent, Ng2Component],
           entryComponents: [Ng2Component],
           imports: [BrowserModule, UpgradeModule]
         })
         class Ng2Module {
           ngDoBootstrap() {}
         }

         const ng1Module = angular.module('ng1', [])
                               .directive('ng1a', () => ({template: '{{ l(\'ng1a\') }}'}))
                               .directive('ng1b', () => ({template: '{{ l(\'ng1b\') }}'}))
                               .directive('ng2', downgradeComponent({component: Ng2Component}))
                               .run(($rootScope: any /** TODO #9100 */) => {
                                 $rootScope.l = l;
                                 $rootScope.reset = () => log.length = 0;
                               });

         const element =
             html('<div>{{reset(); l(\'1A\');}}<ng2>{{l(\'1B\')}}</ng2>{{l(\'1C\')}}</div>');
         bootstrap(platformBrowserDynamic(), Ng2Module, element, ng1Module).then((upgrade) => {
           expect(document.body.textContent).toEqual('1A;2A;ng1a;2B;ng1b;2C;1C;');
           // https://github.com/angular/angular.js/issues/12983
           expect(log).toEqual(['1A', '1B', '1C', '2A', '2B', '2C', 'ng1a', 'ng1b']);
         });
       }));

    it('should verify UpgradeAdapter example', async(() => {

         // This is wrapping (upgrading) an Angular 1 component to be used in an Angular 2
         // component
         @Directive({selector: 'ng1'})
         class Ng1Component extends UpgradeComponent {
           @Input() title: string;

           constructor(elementRef: ElementRef, injector: Injector) {
             super('ng1', elementRef, injector);
           }
         }

         // This is an Angular 2 component that will be downgraded
         @Component({
           selector: 'ng2',
           template: 'ng2[<ng1 [title]="nameProp">transclude</ng1>](<ng-content></ng-content>)'
         })
         class Ng2Component {
           @Input('name') nameProp: string;
         }

         // This module represents the Angular 2 pieces of the application
         @NgModule({
           declarations: [Ng1Component, Ng2Component],
           entryComponents: [Ng2Component],
           imports: [BrowserModule, UpgradeModule]
         })
         class Ng2Module {
           ngDoBootstrap() { /* this is a placeholder to stop the boostrapper from complaining */
           }
         }

         // This module represents the Angular 1 pieces of the application
         const ng1Module =
             angular
                 .module('myExample', [])
                 // This is an Angular 1 component that will be upgraded
                 .directive(
                     'ng1',
                     () => {
                       return {
                         scope: {title: '='},
                         transclude: true,
                         template: 'ng1[Hello {{title}}!](<span ng-transclude></span>)'
                       };
                     })
                 // This is wrapping (downgrading) an Angular 2 component to be used in Angular 1
                 .directive(
                     'ng2',
                     downgradeComponent({component: Ng2Component, inputs: ['nameProp: name']}));

         // This is the (Angular 1) application bootstrap element
         // Notice that it is actually a downgraded Angular 2 component
         const element = html('<ng2 name="World">project</ng2>');

         // Let's use a helper function to make this simpler
         bootstrap(platformBrowserDynamic(), Ng2Module, element, ng1Module).then(upgrade => {
           expect(multiTrim(element.textContent))
               .toBe('ng2[ng1[Hello World!](transclude)](project)');
         });
       }));