import { NgxInfiniteScrollerDirective } from '../ngx-infinite-scroller.directive';
import { DirectiveStateService } from '../directive-state.service';
export declare class ScrollHeightListener {
    private directive;
    private state;
    private DEFAULT_REQUEST_TIMEOUT;
    private listener;
    private httpRequestTimeout;
    constructor(directive: NgxInfiniteScrollerDirective, state: DirectiveStateService);
    start(): void;
    stop(): void;
    private listen;
    private stopIfRequestTimeout;
}