/// <reference types="node" />
import { WriteStream } from 'fs';
export declare class ExportService {
    private firestore;
    constructor(firestore: FirebaseFirestore.Firestore);
    export(path: string, writeStream: WriteStream, timestamp: string, transformer?: (data: any, path: string) => Promise<any>, excludedCollections?: string[]): Promise<void>;
    private processDocument;
    private processCollections;
    private processCollection;
}