I had forgotten I had already prepared this PR. You can of course close it then if you don't want to use it, but since its changes are mostly minimal (ignoring the dist files which are auto-generated), while still giving the benefit of getting both type-checking within JavaScript source and getting declaration files auto-produced so projects can get autocomplete and type info in their own JavaScript or TypeScript projects, it would seem to me that there is little reason not to accept the PR.