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But you can do that same API emulation in regular browser JavaScript, too. What's the WASM intermediate buying here?

I think it is more complicated to emulate those api in normal browser environment compared to emulating some OS api for running node.js.

Why? It's literally JavaScript on both sides - what's complicated here?

Because many node.js api are written in C/C++, it might be easier to implements OS features instead of rewriting in JS. This is just my assumption.