/**
 * Generates a random Date within a specified range.
 *
 * @param start - The start date (inclusive).
 * @param end - The end date (inclusive).
 * @returns A random Date between start and end.
 *
 * @throws {Error} If start or end is an invalid date or if start is after end.
 *
 * @example
 * // Random date in 2024
 * const start = new Date('2024-01-01');
 * const end = new Date('2024-12-31');
 * randomDate(start, end); // Random date in 2024
 *
 * @example
 * // Random date in the next 7 days
 * const now = new Date();
 * const week = new Date(now.getTime() + 7 * 24 * 60 * 60 * 1000);
 * randomDate(now, week);
 *
 * @complexity Time: O(1), Space: O(1)
 */
export declare function randomDate(start: Date, end: Date): Date;
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