export default class Type {
  static string (str) {
    if (str instanceof String) {
      return str.valueOf()
    } else if (typeof str !== 'string') {
      throw new TypeError(`Expected ${typeof str} to be a string.`)
    }
    return str
  }

  static number (num) {
    if (num instanceof Number) {
      return num.valueOf()
    } else if (typeof num !== 'number') {
      throw new TypeError(`Expected ${typeof num} to be a number.`)
    }
    return num
  }
}