import { PipeTransform } from '@angular/core';
import { FirestoreService } from "../services/firestore-service.service";
import { Observable } from "rxjs";
import { DocumentReference } from "@angular/fire/firestore";
export declare class DocPipe implements PipeTransform {
    private db;
    constructor(db: FirestoreService);
    transform(value: DocumentReference): Observable<any>;
}