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[英]Angular2 with TypeScript: Declaration expected compiler error after @component
[英]Typescript throws Declaration Expected error with Angular 2 component
我使用typescript構建一個角度2應用程序,我嘗試創建新的組件調用sidekik.component.ts並導入到這樣的app.component.ts。
app.component.ts
import {Component} from 'angular2/core';
import {SideKikComponent} from './classes/sidekik.component';
interface Hero {
id: number;
name: string;
}
@Component({
selector: 'my-app',
directives:[
SideKikComponent,
],
templateUrl:'app/views/heros.html',
styleUrls: ['app/css/site.css']
})
export class AppComponent {
public title = 'Tour of Heroes';
public heroes =HEROS;
public selectedHero: Hero;
onSelect(hero: Hero) {
this.selectedHero = hero;
}
}
var HEROS: Hero[] =[
{"id":1,"name":"SuperMan"},
{"id":2,"name":"Captain America"},
{"id":3,"name":"Thor"},
{"id":4,"name":"Iorn Man"},
{"id":5,"name":"Ant Man"}
];
sidekik.component.ts
import {Component, View} from 'angular2/core';
@Component({
selector:'sidekik',
events:['hit'],
properties:['define'],
template: `
<sidekik (click) = "hit(define)"></sidekik>
`,
});
export class SideKikComponent{
hit(define:string){
console.log(define);
}
}
然后我運行npm start它顯示
rumes@rumes-HP-ProBook-4530s:/var/www/html/angular2ts$ tsc --version
message TS6029: Version 1.7.5
rumes@rumes-HP-ProBook-4530s:/var/www/html/angular2ts$ npm start
> angular2ts@1.0.0 start /var/www/html/angular2ts
> concurrent "npm run tsc:w" "npm run lite"
[0]
[0] > angular2ts@1.0.0 tsc:w /var/www/html/angular2ts
[0] > tsc -w
[0]
[1]
[1] > angular2ts@1.0.0 lite /var/www/html/angular2ts
[1] > lite-server
[1]
[1] [BS] Access URLs:
[1] ------------------------------------
[1] Local: http://localhost:3000
[1] External: http://192.168.1.7:3000
[1] ------------------------------------
[1] UI: http://localhost:3001
[1] UI External: http://192.168.1.7:3001
[1] ------------------------------------
[1] [BS] Serving files from: ./
[1] [BS] Watching files...
[0] app/classes/sidekik.component.ts(11,3): error TS1146: Declaration expected.
[1] 15.12.17 16:04:28 304 GET /./index.html (Unknown - 29ms)
[0] 4:04:28 PM - Compilation complete. Watching for file changes.
[1] 15.12.17 16:04:28 304 GET /node_modules/angular2/bundles/angular2-polyfills.js (Unknown - 310ms)
[1] 15.12.17 16:04:28 304 GET /node_modules/systemjs/dist/system.src.js (Unknown - 310ms)
[1] 15.12.17 16:04:28 304 GET /node_modules/rxjs/bundles/Rx.js (Unknown - 310ms)
[1] 15.12.17 16:04:28 304 GET /node_modules/angular2/bundles/angular2.dev.js (Unknown - 310ms)
[1] [BS] File changed: app/classes/sidekik.component.js
[1] [BS] File changed: app/app.component.js
[1] [BS] File changed: app/boot.js
[1] 15.12.17 16:04:29 200 GET /app/boot.js (Unknown - 40ms)
[1] 15.12.17 16:04:30 200 GET /app/app.component.js (Unknown - 92ms)
[1] 15.12.17 16:04:30 200 GET /app/classes/sidekik.component.js (Unknown - 75ms)
[1] 15.12.17 16:04:31 304 GET /app/views/heros.html (Unknown - 227ms)
[1] 15.12.17 16:04:31 404 GET /favicon.ico (Unknown - 229ms)
誰能幫我這個?。
我遇到了同樣的問題(在編譯時Typescript Declaration expected
發出的Typescript Declaration expected
),雖然它也表現為Angular在瀏覽器中拋出的異常:
No Directive annotation found on [Errant Module]
這對我有用:
刪除@Component();
末尾的分號@Component();
(sidekik.component.ts)
一個簡單的解釋是裝飾器是返回函數的表達式 。 也就是說,裝飾者不是聲明 。 語句告訴編譯器要做的事情,並且需要停止分號(或新行)。 表達式只返回值。
所以裝飾者不能以分號結尾,因為它們不是語句,因為如果可以的話,這將使編寫JS引擎的人的生活更加艱難(這是猜測)。
您可以在此處了解有關裝飾器的更多信息
問題是將@Component()與SideKikComponent類分開的分號。 @Component是附加到其后面的類的注釋。 所以一堂課必須遵循它。 如果刪除半冒號以及導出的類,以便@Component()位於文件的底部,則會得到完全相同的錯誤,因為@Component需要一個類。
“@Component是一個注釋,它告訴Angular,注釋附加到的類是一個組件。” - http://blog.thoughtram.io/angular/2015/05/03/the-difference-between-annotations-and-decorators.html
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