WASM doesn't really seem like a real candidate for something like this - not if you want an API you can consume from JS, anyhow.
Most likely the amount of work you'd be able to outsource to WASM, is more or less the same work you're already outsourcing to highly optimized C code with the standard (String, RegExp, etc.) JS APIs - so I don't think there's a whole lot to gain with WASM here?
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WASM doesn't really seem like a real candidate for something like this - not if you want an API you can consume from JS, anyhow.
Most likely the amount of work you'd be able to outsource to WASM, is more or less the same work you're already outsourcing to highly optimized C code with the standard (String, RegExp, etc.) JS APIs - so I don't think there's a whole lot to gain with WASM here?