Injector

Stable

Class

What it does

Injector interface

How to use

const injector: Injector = ...; injector.get(...);

Class Overview

class Injector {
static THROW_IF_NOT_FOUND : _THROW_IF_NOT_FOUND
static NULL : Injector
get(token: Type<T>|InjectionToken<T>, notFoundValue?: T) : T

}

Class Description

For more details, see the Dependency Injection Guide.

Example

const injector: Injector = ReflectiveInjector.resolveAndCreate([{provide: 'validToken', useValue: 'Value'}]); expect(injector.get('validToken')).toEqual('Value'); expect(() => injector.get('invalidToken')).toThrowError(); expect(injector.get('invalidToken', 'notFound')).toEqual('notFound');

Injector returns itself when given Injector as a token:

const injector = ReflectiveInjector.resolveAndCreate([]); expect(injector.get(Injector)).toBe(injector);

Static Members

THROW_IF_NOT_FOUND : _THROW_IF_NOT_FOUND
NULL : Injector

Class Details

get(token: Type<T>|InjectionToken<T>, notFoundValue?: T) : T

Retrieves an instance from the injector based on the provided token. If not found:

  • Throws NoProviderError if no notFoundValue that is not equal to Injector.THROW_IF_NOT_FOUND is given
  • Returns the notFoundValue otherwise

exported from core/index, defined in core/src/di/injector.ts