javascript箭头函数连写是什么意思？一直不太理解，请大佬说详细一点，代码如下：

let CURRENT = 'NULL';
const renderAuthorize = Authorized => currentAuthority => {  //这一行的箭头函数连写是什么意思？
  if (currentAuthority) {
    if (typeof currentAuthority === 'function') {
      CURRENT = currentAuthority();
    }
    if (
      Object.prototype.toString.call(currentAuthority) === '[object String]' ||
      Array.isArray(currentAuthority)
    ) {
      CURRENT = currentAuthority;
    }
  } else {
    CURRENT = 'NULL';
  }
  return Authorized;
};

export { CURRENT };
export default Authorized => renderAuthorize(Authorized);

问题就是第2行代码的箭头函数连写，它是什么意思？