import { Observable } from 'rxjs';
import { StrategyBase } from './strategy-base';
import { NgxInfiniteScrollerDirective } from '../ngx-infinite-scroller.directive';
import { DirectiveStateService } from '../directive-state.service';
import { ScrollingStrategy } from '../model/scrolling-strategy.model';
import { ScrollPosition } from '../model/scroll-position.model';
export declare class ScrollingToBottom extends StrategyBase implements ScrollingStrategy {
    constructor(directive: NgxInfiniteScrollerDirective, state: DirectiveStateService);
    scrollDirectionChanged(scrollPairChanged: Observable<ScrollPosition[]>): Observable<ScrollPosition[]>;
    scrollRequestZoneChanged(scrollDirectionChanged: Observable<ScrollPosition[]>): Observable<ScrollPosition[]>;
    askForUpdate(): void;
    setInitialScrollPosition(): void;
    setPreviousScrollPosition(): void;
}