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@angular/corecode
ConstructorProvider
interface
stable
Configures the Injector to return an instance of a token.
On this page
API
interface ConstructorProvider extends ConstructorSansProvider { provide: Type<any>; multi?: boolean | undefined; override deps?: any[] | undefined;}
provide
Type<any>An injection token. Typically an instance of Type or InjectionToken, but can be any.
multi
boolean | undefinedWhen 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.
Usage Notes
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({
providers: [
{provide: locale, multi: true, useValue: 'en'},
{provide: locale, multi: true, useValue: 'sk'},
],
});
const locales: string[] = injector.get(locale);
expect(locales).toEqual(['en', 'sk']);Jump to details