How to troubleshoot esbuild in Rails 7

With the arrival of Rails 7.0, i have tried moving from webpack to esbuild but struggle with it.

I know that theoretically, creating a file jquery.js and importing it in application.js
import jquery from “jquery”
window.jQuery = jquery window.$ = jquery

Should make $ available in the views… but sometimes it doesn't but i have no idea why (even if esbuild compiles successfully) Any idea how to troubleshoot this?

I have noticed for example that I need to put a carriage return after the last line in jquery.js... if I don't, I dont have any error message in the console the the .map is not generated