import { ElementRef, InjectionToken, NgZone, OnDestroy } from "@angular/core";
import { Subject } from "rxjs";
import * as i0 from "@angular/core";
export declare const RESIZE_OBSERVER_AVAILABLE: InjectionToken<boolean>;
export declare class IntResizeObserverService implements OnDestroy {
    private readonly elementRef;
    private readonly ngZone;
    private readonly isResizeObserverAvailable;
    private readonly windowRef;
    resizeObserverRef: ResizeObserver;
    observable$: Subject<ResizeObserverEntry[]>;
    rafRef: null | number;
    constructor(elementRef: ElementRef, ngZone: NgZone, isResizeObserverAvailable: boolean, windowRef: Window);
    private check;
    ngOnDestroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<IntResizeObserverService, [null, null, { optional: true; }, null]>;
    static ɵprov: i0.ɵɵInjectableDeclaration<IntResizeObserverService>;
}