ConstructorProvider
Configures the Injector to return an instance of a token.
interface ConstructorProvider extends ConstructorSansProvider {
provide: Type<any>
multi?: boolean
// 继承自 core/ConstructorSansProvider
deps?: any[]
}
参见
属性
| 属性 | 说明 |
|---|---|
provide: Type<any> | An injection token. Typically an instance of |
multi?: boolean | When true, injector returns an array of instances. This is useful to allow multiple providers spread across many files to provide configuration information to a common token. |
使用说明
class Square {
name = 'square';
}
const injector = Injector.create({providers: [{provide: Square, deps: []}]});
const shape: Square = injector.get(Square);
expect(shape.name).toEqual('square');
expect(shape instanceof Square).toBe(true);
Multi-value example
const locale = new InjectionToken<string[]>('locale');
const injector = Injector.create([
{provide: locale, multi: true, useValue: 'en'},
{provide: locale, multi: true, useValue: 'sk'},
]);
const locales: string[] = injector.get(locale);
expect(locales).toEqual(['en', 'sk']);
