const toString = Object.prototype.toString;

export function is(val: unknown, type: string) {
  return toString.call(val) === `[object ${type}]`;
}

export function isString(val: unknown): val is string {
  return is(val, 'String');
}

export function isFunction(val: unknown): val is Function {
  return typeof val === 'function';
}

export function isBoolean(val: unknown): val is boolean {
  return is(val, 'Boolean');
}

// 判断是否为浏览器环境
export const canUseDOM = !!(
  typeof window !== 'undefined' &&
  window.document &&
  window.document.createElement
);


// 浏览器
export const inBrowser: boolean = typeof window !== 'undefined';

// 获取相关浏览器信息
export const UA: string | boolean =
  inBrowser && window.navigator.userAgent.toLowerCase();

// 是否微信浏览器
export const isWeChat: boolean = !!UA && /micromessenger/g.test(UA);