// type NonNullable<T> = T extends null | undefined ? never : T;

const toString = Object.prototype.toString;

const isType =
  <T>(type: string | string[]) =>
  (obj: unknown): obj is T =>
    getType(obj) === `[object ${type}]`;
export const getType = (obj: any) => toString.call(obj);
export const isArr = Array.isArray;
export const isValid = (val: any) => val !== null && val !== undefined;
export const isFn = (val: any): val is Function => typeof val === 'function';
export const isPlainObj = isType<object>('Object');
export const isStr = isType<string>('String');
export const isBool = isType<boolean>('Boolean');
export const isNum = isType<number>('Number');
export const isMap = (val: any): val is Map<any, any> => val && val instanceof Map;
export const isSet = (val: any): val is Set<any> => val && val instanceof Set;
export const isWeakMap = (val: any): val is WeakMap<any, any> => val && val instanceof WeakMap;
export const isWeakSet = (val: any): val is WeakSet<any> => val && val instanceof WeakSet;
export const isNumberLike = (index: any): index is number => isNum(index) || /^\d+$/.test(index);
export const isObj = (val: unknown): val is object => typeof val === 'object';
export const isRegExp = isType<RegExp>('RegExp');
export const isReactElement = (obj: any): boolean => obj && obj['$$typeof'] && obj['_owner'];
export const isHTMLElement = (target: any): target is EventTarget => {
  return Object.prototype.toString.call(target).indexOf('HTML') > -1;
};