import { ElementRef, EventEmitter, OnDestroy } from '@angular/core';
import * as i0 from "@angular/core";
export declare class IntersectionObserverDirective implements OnDestroy {
    private _el;
    root: import("@angular/core").InputSignal<HTMLElement>;
    threshold: import("@angular/core").InputSignal<number | number[]>;
    intersectionChange: EventEmitter<IntersectionObserverEntry>;
    private _observer;
    private _isIntersecting?;
    private _isPlatformBrowser;
    constructor(_el: ElementRef, platform: object);
    isIntersecting(): boolean | undefined;
    ngOnDestroy(): void;
    private _initObserver;
    static ɵfac: i0.ɵɵFactoryDeclaration<IntersectionObserverDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<IntersectionObserverDirective, "[bkIntersection]", ["bkIntersection"], { "root": { "alias": "root"; "required": false; "isSignal": true; }; "threshold": { "alias": "threshold"; "required": false; "isSignal": true; }; }, { "intersectionChange": "intersectionChange"; }, never, never, true, never>;
}