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Javascript's async-everything is really unique in a domain where async is almost always bolted on to synchronous-everything in some sort of incompatible subecosystem.

I mostly do this in Dart (though even Dart also has sync IO, it’s just not supposed to be used often), but yeah other languages may not have this benefit.

Also, it’s only true in the browser. Node and Deno have sync I/O.

You still end up having to make a choice about whether your function should be async.