import { Observable } from 'rxjs/Observable';
import { Operator } from 'rxjs/Operator';
import { Subscriber } from 'rxjs/Subscriber';
import { Subscription } from 'rxjs/Subscription';
import * as firebase from 'firebase';
export declare class FirebaseObjectObservable<T> extends Observable<T> {
    $ref: firebase.database.Reference;
    constructor(subscribe?: <R>(subscriber: Subscriber<R>) => Subscription | Function | void, $ref?: firebase.database.Reference);
    lift<T, R>(operator: Operator<T, R>): Observable<R>;
    set(value: any, onComplete?: (a: Object) => any): firebase.Promise<void>;
    transaction(transactionUpdate: (a: any) => any, onComplete?: (a: Object, b: boolean, c: firebase.database.DataSnapshot) => any, applyLocally?: boolean): firebase.Promise<{
        committed: boolean;
        snapshot: firebase.database.DataSnapshot;
    }>;
    update(value: Object, onComplete?: (a: Object) => any): firebase.Promise<void>;
    remove(onComplete?: (a: Object) => any): firebase.Promise<void>;
}