/**
 * Is the given argument is a finite Number
 *
 * @example
 * ```ts
 * isNumber(123); // -> true
 * isNumber(Infinity); // -> false
 * isNumber('123'); // -> false
 * ```
 *
 * @param x - Argument to test
 * @return - Whether the argument a finite number or not
 */
export default function isNumber(x: unknown): x is number;