/**
 * Preact hook for IndexedDB: open database, create stores/indexes, return a database controller.
 * Uses a singleton connection per (name, version).
 * @module useIndexedDB
 */
import type { IndexedDBConfig } from "./indexedDB/types";
import type { IDBController } from "./indexedDB/dbController";
export type { IndexedDBConfig, IDBController } from "./indexedDB";
export interface UseIndexedDBReturn {
    /** Database controller (table, transaction). Null until the database is open. */
    db: IDBController | null;
    /** True once the database is open and ready. */
    isReady: boolean;
    /** Error from opening the database, if any. */
    error: DOMException | null;
}
/**
 * Opens an IndexedDB database and returns a controller for tables and transactions.
 * Handles onupgradeneeded: creates object stores and indexes from config.
 * Connection is a singleton per (config.name, config.version).
 *
 * @param config - Database name, version, and table schemas (keyPath, autoIncrement, indexes).
 * @returns { db, isReady, error }. Use db.table(name) and db.transaction(...) when isReady is true.
 *
 * @example
 * const { db, isReady, error } = useIndexedDB({
 *   name: 'my-db',
 *   version: 1,
 *   tables: {
 *     users: { keyPath: 'id', autoIncrement: true, indexes: ['email'] },
 *   },
 * })
 * if (isReady && db) {
 *   const users = db.table('users')
 *   await users.insert({ email: 'a@b.com' })
 *   await db.transaction(['users'], 'readwrite', (tx) => tx.table('users').insert({ email: 'b@b.com' }))
 * }
 */
export declare function useIndexedDB(config: IndexedDBConfig): UseIndexedDBReturn;