/**
 * Mocks the IntersectionObserver API for testing environments.
 *
 * This function adds a mock implementation of the IntersectionObserver API to the global window object.
 * The mock implementation provides all the necessary methods (observe, unobserve, disconnect, takeRecords)
 * but with empty implementations, allowing tests of components that use IntersectionObserver to run
 * without errors in Jest's JSDOM environment.
 *
 * Useful for testing components that rely on:
 * - Lazy loading
 * - Infinite scrolling
 * - Visibility-based rendering
 * - Any other intersection-based functionality
 *
 * @example
 * // In your jest setup file
 * import { setupIntersectionObserver } from '@trackunit/react-test-setup';
 *
 * setupIntersectionObserver();
 */
export declare const setupIntersectionObserver: () => typeof MockIntersectionObserver;
declare class MockIntersectionObserver {
    readonly root: Element | null;
    readonly rootMargin: string;
    readonly scrollMargin: string;
    readonly thresholds: ReadonlyArray<number>;
    constructor();
    disconnect(): void;
    observe(): void;
    takeRecords(): Array<IntersectionObserverEntry>;
    unobserve(): void;
}
export {};