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swc (https://github.com/swc-project/swc) is a rust equivalent to babel and has a bundler under development. Not sure how far along it is.

That would be an interesting comparison of performance and features.

SWC looks cool, but esbuild is more mature I think. The bugs in SWC's changelog make me pretty wary of using it in production just yet.

swc is more ambitious, it wants to re-implement all of tsc type checking, not only transpiling: https://github.com/swc-project/swc/issues/571