AST marshalling/unmarshalling bettween JS and Wasm will add so much cost, I don't think it's worth.
Interesting new direction: Babel, implemented in Rust. I wonder how fast this code would be if it were compiled to WebAssembly.https://twitter.com/Atinux/status/1076800682571780096 …
The future is fast for web development 
https://github.com/swc-project/swc pic.twitter.com/m83basxlCU
https://github.com/swc-project/swc pic.twitter.com/m83basxlCU-
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You don't need to marshal the whole AST, you could do the AST part only in Rust and emit a string
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That's true but we want to keep using the Babel plugins written in JS.
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Also, the AST in JS is very easy to use vs Rust in my experience. Cycles are often nice when working with the AST as a Graph rather than a tree to track contextual data in parent nodes. Rust does not deal with graphs/cycles in a pleasant way.
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Yeah, you can use an Arc or ref cells but I agree, tree structures in Rust are deceptively difficult
End of conversation
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Why would you compile it to WebAssembly?
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if babel is compiled to webassembly, this will be a big shift on the DX :) really excited about this!
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