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.
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A short case study of a real production issue that was debugged, minimized, and fixed using property-based testing.