/**
 * svelte-idb — Change Notifier
 *
 * Pub/sub system for mutation events with microtask batching.
 * When a store is mutated, subscribers are notified on the next microtask,
 * preventing excessive re-queries during batch operations.
 */
import type { ChangeEvent, ChangeSubscriber } from './types.js';
export declare class ChangeNotifier {
    private subscribers;
    private pendingStores;
    private scheduled;
    /**
     * Subscribe to change events for a specific store.
     * @returns An unsubscribe function.
     */
    subscribe(storeName: string, callback: ChangeSubscriber): () => void;
    /**
     * Notify that a store was mutated.
     * Notifications are batched via microtask to coalesce rapid mutations.
     */
    notify(storeName: string, _event: ChangeEvent): void;
    /**
     * Flush pending notifications — fires all subscribers once per affected store.
     */
    private flush;
    /** Returns the number of active subscribers for a store (for testing). */
    subscriberCount(storeName: string): number;
}