// 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;

};