import { AfterViewInit, ElementRef, OnInit } from '@angular/core';
export declare class NgxTableSortableDirective implements OnInit, AfterViewInit {
    private el;
    private headerCells;
    private sortingSettings;
    private headerCellSelector;
    private onSortingChanged;
    constructor(el: ElementRef);
    ngOnInit(): void;
    ngAfterViewInit(): void;
    private initHeaderCells();
    private registerCellClickHandlers();
    private cellClickHandler(element);
    private toggleSortingClasses();
    private removeSortingClasses(element);
    private addSortingClasses(element);
}