/**
 * Custom JSON replacer function.
 * Supports serialization of complex data types like Map and Set.
 * @param key - The key being processed.
 * @param value - The value associated with the key.
 * @returns The value to be serialized.
 */
export declare function jsonReplacer(this: Record<string, unknown>, key: string, value: unknown): unknown;
/**
 * Custom JSON reviver function.
 * Supports deserialization of complex data types like Map and Set.
 * @param _key - The key being processed.
 * @param value - The value associated with the key.
 * @returns The value to be deserialized.
 */
export declare function jsonReviver(_key: string, value: unknown): unknown;