/**
 * Compute factorial of X (X!)
 * Note that factorial of 13 is already 6,227,020,800 which exceeds 32bit integer limit
 * Note that this implementation is intended for small inputs only
 * @example factorial(5) == 5 * 4 * 3 * 2 * 1 == 120
 * @param {number} x must be an integer
 * @return {number}
 */
export function factorial(x: number): number;
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