#webpacker

Ok had planned two weeks for integrating reveal.js with Rails6, and 24hours later success!. I tried the webpacker/yarn route, and that is just an uncontrollable beast. so glad they ditched that for Rails7. So finally just added a new controller/route for the reveal.js presentations, and a separate layout, and just used CDN for loading the css/js. CDN can be begotten here.

In the past weeks, I had troubles running Rails 6 tests on Heroku CI due to the following Webpacker error

ActionView::Template::Error: Webpacker can't find application in /app/public/packs-test/manifest.json. Possible causes: 1. You want to set webpacker.yml value of compile to true for your environment unless you are using the `webpack -w` or the webpack-dev-server. 2. webpack has not yet re-run to reflect updates. 3. You have misconfigured Webpacker's config/webpacker.yml file. 4. Your webpack configuration is not creating a manifest. Your manifest contains: { }

Tests worked on my local machine but failed on Heroku CI and my webpacker.yml was properly configured with compile: true in the test section.

Turns out, the compile: true directive is ignored on Heroku while running tests. The issue is simply that webpacker:compile was/is never launched. Surprisingly, it is launched on production deploy.

To fix the error above, force Heroku CI to precompile your assets in the test-setup step of your app.json. Something like