[notnullorvoid]

I agree that CJS needs to go, and the sooner the better. However it's slightly irritating hearing this presented on the Deno blog. Deno is no better when it comes to causing issues for library authors who want to provide cross runtime compatible ESM modules. They bundle their own fork of TS which lags behind TS stable, no support for important things like `typeVersions`, no way to test your library with newer (or older) TS versions. You're better off authoring ESM libraries for Node then telling Deno users to use `npm:` imports.