Function _isNativeFunction

packages/socket.io/client-dist/socket.io.js:103–109

(t)

    t.prototype = Object.create(o.prototype), t.prototype.constructor = t, _setPrototypeOf(t, o);
  }
  function _isNativeFunction(t) {
    try {
      return -1 !== Function.toString.call(t).indexOf("[native code]");
    } catch (n) {
      return "function" == typeof t;
    }
  }
  function _isNativeReflectConstruct() {
    try {
      var t = !Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {}));