Method constructor

packages/core/src/di/r3_injector.ts:216–244

(
    providers: Array<Provider | EnvironmentProviders>,
    readonly parent: Injector,
    readonly source: string | null,
    readonly scopes: Set<InjectorScope>,
  )

  private injectorDefTypes: Set<Type<unknown>>;

  constructor(
    providers: Array<Provider | EnvironmentProviders>,
    readonly parent: Injector,
    readonly source: string | null,
    readonly scopes: Set<InjectorScope>,
  ) {
    super();
    // Start off by creating Records for every provider.
    forEachSingleProvider(providers as Array<Provider | InternalEnvironmentProviders>, (provider) =>
      this.processProvider(provider),
    );

    // Make sure the INJECTOR token provides this injector.
    this.records.set(INJECTOR, makeRecord(undefined, this));

    // And `EnvironmentInjector` if the current injector is supposed to be env-scoped.
    if (scopes.has('environment')) {
      this.records.set(EnvironmentInjector, makeRecord(undefined, this));
    }

    // Detect whether this injector has the APP_ROOT_SCOPE token and thus should provide
    // any injectable scoped to APP_ROOT_SCOPE.
    const record = this.records.get(INJECTOR_SCOPE) as Record<InjectorScope | null>;
    if (record != null && typeof record.value === 'string') {
      this.scopes.add(record.value as InjectorScope);
    }

    this.injectorDefTypes = new Set(this.get(INJECTOR_DEF_TYPES, EMPTY_ARRAY, {self: true}));
  }

  retrieve<T>(token: PrimitivesInjectionToken<T>, options?: unknown): T | NotFound {
    const flags: InternalInjectFlags =