Injectable

decorator stable

npm Package	@angular/core
Module	import { Injectable } from '@angular/core';
Source	core/src/di/metadata.ts

How To Use

@Injectable()
class Car {}

Description

For more details, see the "Dependency Injection Guide".

Example

@Injectable()
class UsefulService {
}

@Injectable()
class NeedsService {
  constructor(public service: UsefulService) {}
}

const injector = ReflectiveInjector.resolveAndCreate([NeedsService, UsefulService]);
expect(injector.get(NeedsService).service instanceof UsefulService).toBe(true);

Injector

will throw an error when trying to instantiate a class that does not have @Injectable marker, as shown in the example below.

class UsefulService {}

class NeedsService {
  constructor(public service: UsefulService) {}
}

expect(() => ReflectiveInjector.resolveAndCreate([NeedsService, UsefulService])).toThrow();