import { ViewportSnapshot } from './breakpoint';
/**
 * Subscriber function used by the breakpoint store.
 *
 * @category Hooks
 */
export type BreakpointStoreSubscriber = () => void;
/**
 * Shared viewport store used by responsive hooks.
 *
 * @category Hooks
 */
export declare const breakpointStore: {
    /**
     * Subscribes to viewport state updates.
     *
     * @function
     */
    subscribe(listener: BreakpointStoreSubscriber): () => void;
    /**
     * Returns the current viewport snapshot.
     *
     * @function
     */
    getSnapshot(): ViewportSnapshot;
    /**
     * Returns the server-side fallback snapshot.
     *
     * @function
     */
    getServerSnapshot(): ViewportSnapshot;
};