import and install stimulus

Gemfile

@@ -4,6 +4,8 @@ source 'https://rubygems.org'
 gem 'rails', '7.0.3'
 
 gem 'jsbundling-rails'
+gem 'stimulus-rails'
+
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.0.3'
 # See https://github.com/rails/execjs#readme for more supported runtimes

app/javascript/application.js

@@ -1 +1,2 @@
 // Entry point for the build script in your package.json
+import "./controllers"

app/javascript/controllers/application.js

@@ -0,0 +1,9 @@
+import { Application } from "@hotwired/stimulus"
+
+const application = Application.start()
+
+// Configure Stimulus development experience
+application.debug = false
+window.Stimulus   = application
+
+export { application }

app/javascript/controllers/hello_controller.js

@@ -0,0 +1,7 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  connect() {
+    this.element.textContent = "Hello World!"
+  }
+}

app/javascript/controllers/index.js

@@ -0,0 +1,8 @@
+// This file is auto-generated by ./bin/rails stimulus:manifest:update
+// Run that command whenever you add a new controller or create them with
+// ./bin/rails generate stimulus controllerName
+
+import { application } from "./application"
+
+import HelloController from "./hello_controller.js"
+application.register("hello", HelloController)