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How do I find out why Stimulus controllers aren't getting compiled? Asset Pipeline problem

Greg S asked in Javascript

I updated a Rails 6 app to Rails 7 and changed from Webpacker to esbuild/webpack. Added Stimulus, and after not getting controllers to work tried a basic hello_controller and then searched the application.js as seen in Chrome and no 'hello' or "Hello" I made a basic app to compare. I've toggled many settings and don't know where to look.

webpack.config.js are identical. hello_controller.js is identical.

Beginning of Gemfile:

ruby '3.0.2'
gem "rails", "~> 7.0.4"
gem "sprockets-rails"
gem 'sassc-rails', '>= 2.0.1'
gem 'jsbundling-rails'
gem "cssbundling-rails", "~> 1.1"
gem 'turbo-rails'
gem 'stimulus-rails'
gem 'puma', "~> 5.0"
gem 'pg'

package.json

{
  "license": "ISC",
  "main": "application.js",
  "dependencies": {
    "@fortawesome/fontawesome-free": "^5.12.1",
    "@hotwired/stimulus": "^3.1.1",
    "@hotwired/turbo-rails": "^7.0.0-rc.1",
    "@popperjs/core": "^2.11.6",
    "@rails/actiontext": "^6.0.0",
    "@rails/ujs": "^6.0.1",
    "bootstrap": "^5.2.2",
    "bootstrap-icons": "^1.10.2",
    "exiftool": "^0.0.3",
    "imports-loader": "^0.8.0",
    "jquery": "^3.4.1",
    "jqueryui": "^1.11.1",
    "leaflet": "^1.7.1",
    "leaflet.timeline": "1.3.0",
    "lodash": "^4.17.15",
    "mapbox": "^1.0.0-beta10",
    "ol": "^7.1.0",
    "ol-ext": "^4.0.4",
    "ol-layerswitcher": "^4.1.0",
    "ol-loupe": "^1.0.1",
    "ol-popup": "^5.0.0",
    "rails-erb-loader": "^5.5.2",
    "sass": "^1.56.1",
    "stimulus": "^3.1.1",
    "trix": "^1.0.0",
    "webpack": "^5.75.0"
  },
  "devDependencies": {
    "@prettier/plugin-ruby": "^0.22.0",
    "prettier": "^2.2.1",
    "webpack-cli": "^5.0.0"
  },
  "scripts": {
    "build": "webpack --config ./webpack.config.js",
    "build:css": "sass ./app/assets/stylesheets/application.bootstrap.scss:./app/assets/builds/application.css --no-source-map --load-path=node_modules"
  }
}

command line server launch without timestamp

➜ bd
web.1  | started with pid 35879
js.1   | started with pid 35880
css.1  | started with pid 35881
js.1   | yarn run v1.22.19
css.1  | yarn run v1.22.19
js.1   | $ webpack --config ./webpack.config.js --watch
css.1  | $ sass ./app/assets/stylesheets/application.bootstrap.scss:./app/assets/builds/application.css --no-source-map --load-path=node_modules --watch
css.1  | Sass is watching for changes. Press Ctrl-C to stop.
css.1  |
web.1  | => Booting Puma
web.1  | => Rails 7.0.4 application starting in development
web.1  | => Run `bin/rails server --help` for more startup options
web.1  | Puma starting in single mode...
web.1  | * Puma version: 5.6.5 (ruby 3.0.2-p107) ("Birdie's Version")
web.1  | *  Min threads: 5
web.1  | *  Max threads: 5
web.1  | *  Environment: development
web.1  | *          PID: 35879
web.1  | * Listening on http://127.0.0.1:3000
web.1  | * Listening on http://[::1]:3000
web.1  | Use Ctrl-C to stop
js.1   | asset application.js 503 KiB [compared for emit] [minimized] [big] (name: application) 1 related asset
js.1   | orphan modules 2.58 MiB [orphan] 342 modules
js.1   | runtime modules 997 bytes 4 modules
js.1   | cacheable modules 1.75 MiB
js.1   |   modules by path ./node_modules/ol/ 109 KiB
js.1   |     modules by path ./node_modules/ol/*.js 74.9 KiB 18 modules
js.1   |     modules by path ./node_modules/ol/layer/*.js 22.2 KiB 3 modules
js.1   |     modules by path ./node_modules/ol/events/*.js 7.39 KiB
js.1   |       ./node_modules/ol/events/Event.js 1.46 KiB [built] [code generated]
js.1   |       + 2 modules
js.1   |     ./node_modules/ol/control/Control.js 4.44 KiB [built] [code generated]
js.1   |     ./node_modules/ol/extent/Relationship.js 200 bytes [built] [code generated]
js.1   |   ./app/javascript/application.js + 224 modules 1.59 MiB [built] [code generated]
js.1   |   ./node_modules/ol-layerswitcher/dist/ol-layerswitcher.js 23.5 KiB [built] [code generated]
js.1   |   ./node_modules/@rails/actioncable/src/index.js + 9 modules 19.1 KiB [built] [code generated]
js.1   |   ./node_modules/rbush/rbush.min.js 6.31 KiB [built] [code generated]
js.1   |
js.1   | WARNING in configuration
js.1   | The value 'hashed' for option 'optimization.moduleIds' is deprecated. Use 'deterministic' instead.
js.1   |
js.1   | WARNING in asset size limit: The following asset(s) exceed the recommended size limit (244 KiB).
js.1   | This can impact web performance.
js.1   | Assets:
js.1   |   application.js (503 KiB)
js.1   |
js.1   | WARNING in entrypoint size limit: The following entrypoint(s) combined asset size exceeds the recommended limit (244 KiB). This can impact web performance.
js.1   | Entrypoints:
js.1   |   application (503 KiB)
js.1   |       application.js
js.1   |
js.1   | WARNING in webpack performance recommendations:
js.1   | You can limit the size of your bundles by using import() or require.ensure to lazy load some parts of your application.
js.1   | For more info visit https://webpack.js.org/guides/code-splitting/
js.1   |
js.1   | webpack 5.75.0 compiled with 4 warnings in 2885 ms
web.1  | Started GET "/" for ::1 at 2022-11-26 17:43:46 -0800
web.1  |   ActiveRecord::SchemaMigration Pluck (1.1ms)  SELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC
web.1  | Processing by StaticPagesController#home as HTML
web.1  |   Rendering layout layouts/application.html.erb
web.1  |   Rendering static_pages/home.html.erb within layouts/application
web.1  |   Rendered static_pages/home.html.erb within layouts/application (Duration: 1.1ms | Allocations: 1462)
web.1  |   Rendered layouts/_header.html.erb (Duration: 2.7ms | Allocations: 4997)
web.1  |   Rendered layouts/_footer.html.erb (Duration: 0.6ms | Allocations: 556)
web.1  |   Rendered layout layouts/application.html.erb (Duration: 7.0ms | Allocations: 9376)
web.1  | Completed 200 OK in 10ms (Views: 8.2ms | ActiveRecord: 0.0ms | Allocations: 13007)
web.1  |
web.1  |

No console errors

Not an answer, but I got it working by running rails assets:precompile. Shouldn't this be part of Profile.dev? or something like that?

Still curious about original question of how to see what is happening and what should happen.

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