ruby-on-rails-6 - Rails 6：找不到模块“private_pub”，未定义 PrivatePub

Question

我试图连接 gems https://github.com/ryanb/private_pub并得到下一个错误：

Uncaught Error: Cannot find module 'private_pub'
    at webpackMissingModule (application.js:4)
    at Module../app/javascript/packs/application.js (application.js:4)
    at __webpack_require__ (bootstrap:19)
    at bootstrap:83
    at bootstrap:83
7:33 Uncaught ReferenceError: PrivatePub is not defined
    at 7:33

添加时出现错误require("private_pub")

我的 application.js 看起来像：

require("@rails/ujs").start()
require("private_pub")
require("turbolinks").start()
require("@rails/activestorage").start()
require("channels")
require("jquery")

可能是什么原因，我该如何解决？提前致谢！