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I don’t know but I would guess it’s because of the relationship between Rust and Mozilla.

https://news.ycombinator.com/item?id=26067118

There are probably specific advantages to Rust, but it’s also just nice to work in a language you like. I can compile Go to WebAssembly so I’m not going to write TypeScript. Your preferences may differ.

Can TypeScript be compiled to WebAssembly? My understanding was that it couldn’t be, although a related language AssemblyScript could be.

One of the major benefits of Rust is that it isn't garbage collected. I'm not sure of the current status of GC support in WASM, but it used to mean that to compile something like Go to WASM also meant including a full GC implementation in the WASM code, not only bloating it but complicating implementation etc.