@angular/core

ConstructorProvider

interface

stable

Configures the Injector to return an instance of a token.

API

  interface ConstructorProvider extends ConstructorSansProvider {}

provide

Type<any>

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

multi

boolean | undefined

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.

deps

any[] | undefined

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']);