import { ElementRef, EventEmitter, NgZone, OnDestroy, OnInit } from '@angular/core';
import * as i0 from "@angular/core";
export declare class VisibilityDirective implements OnInit, OnDestroy {
    private readonly elementRef;
    private intersectionObserver;
    rivVisibility: EventEmitter<boolean>;
    constructor(elementRef: ElementRef<HTMLElement>, zone: NgZone);
    ngOnInit(): void;
    ngOnDestroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<VisibilityDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<VisibilityDirective, "[rivVisibility]", never, {}, { "rivVisibility": "rivVisibility"; }, never, never, false, never>;
}