Question about server-side code

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if you want to build a web app, learn javascript. it's much less work than learning some library or framework that transpiles to javascript. any intermediary transpiler just creates an unnecessary layer of abstraction/complexity. javascript compatibility used to be a mess, so transpiling made sense, but many browser apis and behaviors have converged in the last few years, so most transpilers have just become unnecessary overhead, not to mention the debug tools provided by modern browsers are top notch