// eslint-disable-next-line @typescript-eslint/unbound-method
const opt = Object.prototype.toString;

export function isArray<T = string>(obj: unknown): obj is T[] {
  return opt.call(obj) === "[object Array]";
}

export function isObject<T = string>(obj: unknown): obj is Record<string, T> {
  return opt.call(obj) === "[object Object]";
}

export function isString(obj: unknown): obj is string {
  return opt.call(obj) === "[object String]";
}

export function isNumber(obj: unknown): obj is number {
  return opt.call(obj) === "[object Number]" && obj === obj; // eslint-disable-line
}

export function isRegExp(obj: unknown) {
  return opt.call(obj) === "[object RegExp]";
}

export function isFile(obj: unknown): obj is File {
  return opt.call(obj) === "[object File]";
}

export function isBlob(obj: unknown): obj is Blob {
  return opt.call(obj) === "[object Blob]";
}

export function isUndefined(obj: unknown): obj is undefined {
  return obj === undefined;
}

export function isNull(obj: unknown): obj is null {
  return obj === null;
}

export function isFunction(
  obj: unknown
): obj is (...args: unknown[]) => unknown {
  return typeof obj === "function";
}

export function isEmptyObject(obj: unknown): boolean {
  return isObject(obj) && Object.keys(obj).length === 0;
}

export function isExist(obj: unknown): boolean {
  return !!obj || obj === 0;
}

export function isWindow(el: unknown): el is Window {
  return el === window;
}