import { ElementRef, OnInit } from '@angular/core';
export declare class IBMBackToTopDirective implements OnInit {
    elementRef: ElementRef;
    isActive: boolean;
    didScroll: boolean;
    windowHeight: any;
    buttonAppendTo: any;
    buttonText: string;
    onWindowScroll(): void;
    ngOnInit(): void;
    TopscrollTo(): void;
    toggleBackToTop(): void;
}