/**
 * Generates a unique string ID. Uses crypto.randomUUID when available,
 * otherwise falls back to a timestamp + random string.
 *
 * @param prefix - Optional prefix for the fallback format (e.g. "req", "err").
 *                 Only affects fallback; UUIDs have no prefix.
 */
export declare function createUniqueId(prefix?: string): string;
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