Two terminals are needed.
For live compiling the Scala.js code:
sbt "~fastLinkJS"
For the frontend server:
npm start
Go to your browser, and load an unpacked extension from the dist
folder.
Navigate to http://localhost:1234/ to see your site running on a browser page.
Useful for testing the UI, functionality limited due to the lack of the browser API, you can use dummy data to see it in the UI.