I learned there is an interesting feature of api-extractor that can help with this, it typically throws an error if the *.api.md doesn't match the code base, though in local development the --local flag prevents this. I accidentally left that flag on, I'll work out the details of how it should work in CI. But after properly implementing it, any function that is public to the api and doesn't have a TSDoc release comment, like @public or @beta, will cause the type declaration rollup process to fail.