Function DefaultNumberOption

packages/ecma402-abstract/DefaultNumberOption.ts:8–23

(
  inputVal: unknown,
  min: number,
  max: number,
  fallback: F
)

 * @param fallback
 */
export function DefaultNumberOption<F extends number | undefined>(
  inputVal: unknown,
  min: number,
  max: number,
  fallback: F
): F extends number ? number : number | undefined {
  if (inputVal === undefined) {
    // @ts-expect-error
    return fallback
  }
  const val = Number(inputVal)
  if (isNaN(val) || val < min || val > max) {
    throw new RangeError(`${val} is outside of range [${min}, ${max}]`)
  }
  return Math.floor(val)
}