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GeezerVison is showing next.angular.dev — ConstructorProvider • Angular

API

    
      interface ConstructorProvider extends ConstructorSansProvider {}
    
    

An injection token. Typically an instance of Type or InjectionToken, but can be any.

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.

A list of tokens to be resolved by the injector.

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']);
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