Method replace

packages/core/injector/module.ts:537–550

(toReplace: InjectionToken, options: any)

  }

  public replace(toReplace: InjectionToken, options: any) {
    if (options.isProvider && this.hasProvider(toReplace)) {
      const originalProvider = this._providers.get(toReplace);

      return originalProvider!.mergeWith({ provide: toReplace, ...options });
    } else if (!options.isProvider && this.hasInjectable(toReplace)) {
      const originalInjectable = this._injectables.get(toReplace);

      return originalInjectable!.mergeWith({
        provide: toReplace,
        ...options,
      });
    }
  }

  public hasProvider(token: InjectionToken): boolean {
    return this._providers.has(token);