import { EventEmitter, OnDestroy, OnInit } from '@angular/core';
import { SimpleBaseClass } from '../_base/simple-base-class';
import * as i0 from "@angular/core";
export declare class InViewportDirective extends SimpleBaseClass implements OnInit, OnDestroy {
    inView: EventEmitter<boolean>;
    private observer;
    ngOnInit(): void;
    ngOnDestroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<InViewportDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<InViewportDirective, "[inViewPort],[in-viewport]", never, {}, { "inView": "inView"; }, never, never, false, never>;
}