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What's stopping WebAssembly from effectively replacing JavaScript?
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Sure, you can autogenerated js bindings, but as soon as you need to start debugging or optimizing you need to understand the js that was generated for you.
I don't think so. Having played around with wasm-bindgen in rust as well as other libraries the build on top of it I have never once needed to look at or understand the generated JS code. When you need to debug or optimise things the first thing to look at is the rust code. So as it stands today I do not think you need to know JS to write code for a web frontend - at least in isolation of anything else (ie teams, existing products etc).
You will likely need to learn JS at some point when writing stuff for the web - as the JS ecosystem is so vast for web development when compared to anything else. But WASMs JS bindings are not the point you will need to know it for.