[bbcbasic]

It depends what you are doing. If you have 10 lines of JS then probably no need for an abstraction. However if you have 1000s of lines of client code, then using a purescript or similar can be very beneficial to maintainability and provability of the code.

But there is a learning curve and unlike Haskell where you just know have to know the language, you have to know both the JS quirks and the compiler's quirks too. It is a leaky abstraction. This is the problem I have with a lot of the compile-to-android frameworks vs. just putting with with Java.