I encountered the issue when trying to get the morph feature of Turbo 8 to work. The page just kept refreshing and I didn't understand why. There were no good tutorials yet so I had to dig into the gem.
First, I opened it with
bundle open turbo-rails
There is see that the gem has 3 javascript files:
app/assets/javascripts/turbo.js
app/assets/javascripts/turbo.min.js
app/assets/javascripts/turbo.min.js.map
I added some log statements in turbo.js but realized that I have to change the minified version turbo.min.js. For convenience, I changed the turbo.js file as it's easier to read and recompiled the min.js file with terser.
npm install terser -g
terser turbo.js -o turbo.min.js --compress --mangle
After that I was able to add log statements to the gem's javascript and figure out the issue.
After you play with a gem don't forget to reset its code.
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