import { IBackup } from "migration-script-runner";
import { database } from "firebase-admin";
export declare class BackupService implements IBackup {
    private db;
    private nodes;
    static NODES: {
        ALL: string[];
        SELECTED: never[];
    };
    merge: boolean;
    constructor(db: database.Database, nodes?: string[]);
    getData(): Promise<any>;
    saveData(data: any): Promise<void>;
    backup(): Promise<string>;
    restore(data: string): Promise<void>;
}