/**
 * ===============================================================================
 * SINGLETON PATTERN UTILITIES
 * ===============================================================================
 *
 * Reusable singleton pattern implementation to reduce boilerplate.
 * Used across: HookRegistry, SymbolManager, etc.
 *
 * Usage:
 *   const [getInstance, resetInstance] = createSingleton(() => new MyClass());
 *   export { getInstance as getMyClass, resetInstance as resetMyClass };
 *
 * ===============================================================================
 */
/**
 * Creates a singleton factory with lazy initialization.
 *
 * @param factory - Function that creates the singleton instance
 * @returns Tuple of [getInstance, resetInstance] functions
 *
 * @example
 * ```typescript
 * class DatabaseConnection {
 *   constructor(private config: Config) {}
 * }
 *
 * const [getDb, resetDb] = createSingleton(() => new DatabaseConnection(loadConfig()));
 * export { getDb as getDatabaseConnection };
 * ```
 */
export declare function createSingleton<T>(factory: () => T): [() => T, () => void];
/**
 * Creates a singleton factory with async initialization.
 *
 * @param factory - Async function that creates the singleton instance
 * @returns Tuple of [getInstance, resetInstance] functions
 *
 * @example
 * ```typescript
 * const [getDb, resetDb] = createAsyncSingleton(async () => {
 *   const db = new Database();
 *   await db.connect();
 *   return db;
 * });
 * ```
 */
export declare function createAsyncSingleton<T>(factory: () => Promise<T>): [() => Promise<T>, () => void];
/**
 * Creates a singleton with configurable initialization.
 * Allows passing configuration on first call.
 *
 * @param factory - Function that creates the instance with config
 * @returns Tuple of [getInstance, resetInstance] functions
 *
 * @example
 * ```typescript
 * const [getServer, resetServer] = createConfigurableSingleton(
 *   (config: ServerConfig) => new Server(config)
 * );
 *
 * // First call initializes with config
 * const server = getServer({ port: 3000 });
 *
 * // Subsequent calls return same instance (config ignored)
 * const sameServer = getServer({ port: 4000 }); // Returns 3000 server
 * ```
 */
export declare function createConfigurableSingleton<T, C>(factory: (config: C) => T): [(config: C) => T, () => void];
//# sourceMappingURL=singleton.d.ts.map