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.
Let's go through some libraries from ZIO ecosystem that will allow us to implement API layer with ZIO HTTP
A blueprint and approach for building end-to-end, full-stack applications in Scala 3
How Libretto, a Scala DSL for concurrent programming, can be used for writing custom stream operators
How Scala 3 addresses concerns around implicits and how implicits work in Scala 3.
We all have pretty little things laying around in our codebases, yet, we seldom give them the same love