import { NormalizedLazyValue } from './types';
type DelayResolver<TValue> = (value: TValue) => number | undefined;
type IntersectHandler<TValue> = (el: HTMLElement, value: TValue) => void;
export declare class LazyObserver<TValue = NormalizedLazyValue> {
    private observerOptions;
    private readonly onIntersect;
    private readonly resolveDelay;
    private observer?;
    private readonly observedElements;
    constructor(observerOptions: IntersectionObserverInit, onIntersect: IntersectHandler<TValue>, resolveDelay?: DelayResolver<TValue>);
    setOptions(observerOptions: IntersectionObserverInit): void;
    observe(el: HTMLElement, value: TValue): void;
    unobserve(el: HTMLElement): void;
    disconnect(): void;
    private readonly handleIntersections;
    private ensureObserver;
    private triggerLoad;
}
export {};