How to leverage Scala with scala.js to write frontend as functional programmers would do.

It happens to all of developers, to crawl out of basement of [B]ackend development into a shiny and fancy world of [F]ronted. Does it mean that we have to switch to frontend technological stack and leave our comfy functional scala tools?Let's find out how to leverage Scala with scala.js to write frontend as functional programmers would do.
We will look into three less-understood, yet (arguably) extremely useful constructs introduced in Cats Effect 3: Dispatcher, Supervisor, IOLocal
A blueprint and approach for building end-to-end, full-stack applications in Scala 3
We all have pretty little things laying around in our codebases, yet, we seldom give them the same love
Avoid mistakes in API design, implementation and evolution with Smithy