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export const is = {
  arr: Array.isArray,
  obj: (a: unknown): a is object =>
    Object.prototype.toString.call(a) === '[object Object]',
  fun: (a: unknown): a is Function => typeof a === 'function',
  str: (a: unknown): a is string => typeof a === 'string',
  num: (a: unknown): a is number => typeof a === 'number',
  und: (a: unknown): a is undefined => a === void 0,
  nul: (a: unknown): a is null => a === null,
  set: (a: unknown): a is Set<any> => a instanceof Set,
  map: (a: unknown): a is Map<any, any> => a instanceof Map,
  equ(a: any, b: any) {
    if (typeof a !== typeof b) return false
    if (is.str(a) || is.num(a)) return a === b
    if (
      is.obj(a) &&
      is.obj(b) &&
      Object.keys(a).length + Object.keys(b).length === 0
    )
      return true
    let i
    for (i in a) if (!(i in b)) return false
    for (i in b) if (a[i] !== b[i]) return false
    return is.und(i) ? a === b : true
  },
}