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The browser console complains with:

Failed to register controller: test (controllers/test_controller) Error: Unable to resolve specifier 'stimulus'

[the highest line of source references points to where the error is triggere

if (!(name in registeredControllers)) {
    importShim(path, 'http://localhost:3000/assets/stimulus-loading-1fc59770fb1654500044afd3f5f6d7d00800e5be36746d55b94a2963a7a228aa.js')
      .then(module => registerController(name, module, application))
      .catch(error => console.error(`Failed to register controller: ${name} (${path})`, error))
  }

the last line points to the source of the problem:

// Eager load all controllers defined in the import map under controllers/**/*_controller
import { eagerLoadControllersFrom } from /*"@hotwired/stimulus-loading"*/'blob:http://localhost:3000/cf2bed28-84d1-496d-a453-7a2818e07002'
eagerLoadControllersFrom("controllers", application)

So clearly the app/javascript/controllers/test-controller.js is not firing properly. Its first line calling

import { Controller } from "stimulus"

Which I find odd, as app/javascript/controllers/application.js contains the stock code

How does one resolve the specifier 'stimulus'?
import { Application } from "@hotwired/stimulus"

const application = Application.start()

// Configure Stimulus development experience
application.debug = false
window.Stimulus   = application

export { application }
Jerome
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  • Stimulus is scoped under @hotwired https://stackoverflow.com/questions/36293481/use-of-symbol-in-node-module-names I guess you can't call only "stimulus" in your controller – Maxence Nov 03 '22 at 10:21
  • Well, the above test proves it! – Jerome Nov 03 '22 at 10:47

1 Answers1

3

have you tried this way? On app/javascript/controllers/test-controller.js write this way

import { Controller } from "@hotwired/stimulus";

Hemangini Gohel
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  • Yes, I stumbled upon this while back. I was just circling back to this post to delete it, but it makes sense to keep it up if someone is comparing Rails 6 vs Rails 7. – Jerome Nov 03 '22 at 10:46