/**
 * Generates a random boolean value.
 *
 * @param probability - The probability of returning true (default: 0.5, range: 0-1).
 * @returns A random boolean value.
 *
 * @throws {Error} If probability is NaN or not between 0 and 1.
 *
 * @example
 * // 50/50 chance
 * randomBoolean(); // true or false
 *
 * @example
 * // 75% chance of true
 * randomBoolean(0.75); // More likely to be true
 *
 * @example
 * // 10% chance of true
 * randomBoolean(0.1); // More likely to be false
 *
 * @complexity Time: O(1), Space: O(1)
 */
export declare function randomBoolean(probability?: number): boolean;
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