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I don't share your praise of typescript (native perf is terrible / it's not strict enough so I routinely get hit in production with type errors through the escape hatches) but you can very well use TS with Biome, I maintain a good number of TS services / apps using Biome and SWC (so I get decent performance).

Performance is also the reason I like Biome over eslint / prettier

Biome doesn't want to replace TypeScript.

I thought the same thing. Just another tool in the infinite list of tools in the JS ecosystem. No, thanks.

Why would you have to migrate off of TS?