sample_rails_tailwind/app/javascript/controllers/index.js

// Import and register all your controllers from the importmap via controllers/**/*_controller
// import { application } from "controllers/application"
// import { eagerLoadControllersFrom } from "@hotwired/stimulus-loading"
// eagerLoadControllersFrom("controllers", application)

import { application } from "./application"
import ThemeController from "./theme_controller"
import ToastController from "./toast_controller"

import HelloController from "./hello_controller"
application.register("hello", HelloController)
application.register("theme", ThemeController)
application.register("toast", ToastController)