Function _toPropertyKey

packages/socket.io/client-dist/socket.io.js:142–145

(t)

    return ("string" === r ? String : Number)(t);
  }
  function _toPropertyKey(t) {
    var i = _toPrimitive(t, "string");
    return "symbol" == typeof i ? i : i + "";
  }
  function _typeof(o) {
    "@babel/helpers - typeof";