/**
 * Batch multiple state updates into a single render.
 * Useful for performance optimization when you want to avoid multiple re-renders.
 * @param fn - Function containing multiple state updates
 * @returns The return value of the function
 *
 * @example
 * batch(() => {
 *   storeA.dispatch({ type: "SET", value: 1 });
 *   storeB.dispatch({ type: "SET", value: 2 });
 *   storeC.dispatch({ type: "SET", value: 3 });
 * });
 */
export declare function batch<T>(fn: () => T, mode?: "sync" | "async"): T;
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