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No, neither Deno nor Bun does any type-checking. They both just convert the code to JS.

To do type-checking you need to run TSC.

deno does type checking. https://docs.deno.com/runtime/manual/tools/check

Oh! I stand corrected. That's a wrapper for TSC, though, right?

Edit to add: I see, Deno embeds TSC as a library and tries to straighten out the mess of tsconfig. That must be a leaky abstraction, which makes me wary, but maybe it works well in practice.

"embeds TSC as a library" understates the integration:

https://github.com/denoland/deno/blob/75efc74931c1021fdc41c9...

Deno makes certain tradeoffs that make it feel seamless

I'm now intrigued and might try it out. I like TypeScript but dislike TSC.

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