Function injectableDefOrInjectorDefFactory

packages/core/src/di/r3_injector.ts:571–596

(token: ProviderToken<any>)

}

function injectableDefOrInjectorDefFactory(token: ProviderToken<any>): FactoryFn<any> {
  // Most tokens will have an injectable def directly on them, which specifies a factory directly.
  const injectableDef = getInjectableDef(token);
  const factory = injectableDef !== null ? injectableDef.factory : getFactoryDef(token);

  if (factory !== null) {
    return factory;
  }

  // InjectionTokens should have an injectable def (ɵprov) and thus should be handled above.
  // If it's missing that, it's an error.
  if (token instanceof InjectionToken) {
    throw new RuntimeError(
      RuntimeErrorCode.INVALID_INJECTION_TOKEN,
      ngDevMode && `Token ${stringify(token)} is missing a ɵprov definition.`,
    );
  }

  // Undecorated types can sometimes be created if they have no constructor arguments.
  if (token instanceof Function) {
    return getUndecoratedInjectableFactory(token);
  }

  // There was no way to resolve a factory for this token.
  throw new RuntimeError(RuntimeErrorCode.INVALID_INJECTION_TOKEN, ngDevMode && 'unreachable');
}

function getUndecoratedInjectableFactory(token: Function) {
  // If the token has parameters then it has dependencies that we cannot resolve implicitly.