Are there specific ESLint rules to ensure that only pure functions are written in TypeScript? I am looking to strictly write only pure functions in my code. Could someone please provide guidance on how to accomplish this?
Appreciate any help in advance
Purity Analysis is like tackling the Halting Problem, making it impossible to statically analyze in all cases. There will always exist countless functions that evade your purity checker's ability to classify them as pure or impure.
This leaves any potential purity checker with only two options:
The ideal solution lies in constructing a language, type system, and libraries with pure intentions from the start. By doing so, there may be a chance to conduct automatic purity checks more effectively. Although checking for purity universally remains unattainable, the groundwork for easy verification can enhance the usefulness of the checker.
An alternative approach could involve creating a language that prohibits writing impure functions altogether, but this would limit its practicality. As one of Haskell's creators once mentioned: a purely functional program accomplishes nothing other than generating heat within the CPU. To which someone quipped from the audience: even heating up the CPU qualifies as a side-effect!
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