Possibly alternative target:

Publish an optional extra that targets just *.d.ts files and not .js files, as Types in JS projects otherwise will get no linting on their *.d.ts files.

Though: If one will anyway pull in @typescript/eslint then why not use it for all the files?

I guess flat configs makes this easier as @typescript/eslint doesn't have to be a peer dependency anymore? Assuming that it has been updated to work with flat-config that is.

Had to add skipLibCheck as a temporary fix for typescript-eslint/typescript-eslint#6307