firstValueFromfunction firstValueFrom<T, D>(source: Observable<T>, config: FirstValueFromConfig<D>): Promise<T | D>;function firstValueFrom<T>(source: Observable<T>): Promise<T>;§firstValueFrom<T, D>(source: Observable<T>, config: FirstValueFromConfig<D>): Promise<T | D>[src]§Type Parameters§T[src]§D[src]§Parameters§source: Observable<T>[src]§config: FirstValueFromConfig<D>[src]§Return Type§Promise<T | D>[src]§firstValueFrom<T>(source: Observable<T>): Promise<T>[src]§Type Parameters§T[src]§Parameters§source: Observable<T>[src]§Return Type§Promise<T>[src]