We've switched over our libraries at $WORK to use `tsdown` and it's mostly been a very boring journey, we switched from `tsup` and the DX gains have been massive. Running our `dev` process in the frontend monorepo compiles and bundles all the libraries in less than a second on a cold start compared to `tsup` which was far slower. The biggest gain however was in our CI/CD pipeline where the build servers are much weaker than our developer machines, the `build` step in the quality gate for example went down by over a minute. We've also switched to the new native `tsgo` [0] for type checking, saving us another minute on CI/CD and have migrated a few things from ESLint to Oxlint, which was another easy minute saved. And we switched from Prettier to Biome, and checking the formatting on CI went from ~15s to ~1s. Massive gains are being had in the JS-world from gradual oxidation. Can't wait for Vite with rolldown, we tried that but have a few libraries that depend on SWC which made it a show stopper.[0]: https://github.com/microsoft/typescript-go
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