import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export declare abstract class TimeagoClock {
    abstract tick(then: number): Observable<any>;
}
export declare class TimeagoDefaultClock extends TimeagoClock {
    tick(then: number): Observable<any>;
    static ɵfac: i0.ɵɵFactoryDeclaration<TimeagoDefaultClock, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<TimeagoDefaultClock>;
}