/**
 * @param {IntersectionObserverInit["threshold"]} left
 * @param {IntersectionObserverInit["threshold"]} right
 */
export function thresholdsMatch(left: IntersectionObserverInit["threshold"], right: IntersectionObserverInit["threshold"]): boolean;
/**
 * @typedef {{ observer: IntersectionObserver, isConnected: boolean, release: () => void }} ManagedObserver
 */
/**
 * Observe a target with a shared observer.
 *
 * @param {HTMLElement} target
 * @param {IntersectionObserverCallback} callback
 * @param {IntersectionObserverInit} options
 * @returns {ManagedObserver}
 */
export function createManagedObserver(target: HTMLElement, callback: IntersectionObserverCallback, options: IntersectionObserverInit): ManagedObserver;
/**
 * Disconnect a standalone observer or release one action subscription.
 *
 * @param {IntersectionObserver | ManagedObserver | null | undefined} observer
 * @param {{ isConnected: boolean }} state
 */
export function disconnectObserver(observer: IntersectionObserver | ManagedObserver | null | undefined, state: {
    isConnected: boolean;
}): void;
export type ManagedObserver = {
    observer: IntersectionObserver;
    isConnected: boolean;
    release: () => void;
};