Angular 9 References/ Core


This is the documentation for Angular 9.
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A constructor parameter decorator that tells the DI framework that dependency resolution should start from the parent injector.

constructor(@SkipSelf() service: Service) {}


In the following example, the dependency can be resolved when instantiating a child, but not when instantiating the class itself.

class Dependency {}

class NeedsDependency {
  constructor(@SkipSelf() public dependency: Dependency) { this.dependency = dependency; }

const parent = ReflectiveInjector.resolveAndCreate([Dependency]);
const child = parent.resolveAndCreateChild([NeedsDependency]);
expect(child.get(NeedsDependency).dependency instanceof Dependency).toBe(true);

const inj = ReflectiveInjector.resolveAndCreate([Dependency, NeedsDependency]);
expect(() => inj.get(NeedsDependency)).toThrowError();