我试图安装firebasex cordova 插件，它需要 9>=cordova。所以我更新到cordova 9，当尝试添加cordova插件时，我收到以下错误：
using "requirecordovamodule" to load non-cordova module "fs" is not supported.
instead, add this module to your dependencies and use regular "require" to load it.
怎么解决这个问题呢？