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Afaict, it seems like a rust build on top of oxc and roll down?

But again, all it says is it's fast. And vite is pretty damn fast and widely supported so?

Plus vite exposes roll down config options so yea, what's the point?

I use it to compile backend code. For those use-cases, IMO, vite itself is not so interesting (although I do use vitest). Using tsdown gives me a simplified API to compile my BE code so I can publish it to NPM. Nothing more nothing less. It’s faster and less work to orchestrate using TSC for CJS and ESM output, so very high ROI for me.

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