Set stimulus debug in development mode

Author: Fryguy

app/javascript/controllers/application.js

@@ -3,7 +3,7 @@ import { Application } from "@hotwired/stimulus"
 const application = Application.start()
 
 // Configure Stimulus development experience
-application.debug = false
+application.debug = (process.env.NODE_ENV === 'development')
 window.Stimulus   = application
 
 export { application }