It looks like you've sent a pull request to update our 'lib' files. These files aren't meant to be edited by hand, as they consist of last-known good states of the compiler and are generated from 'src'. Unless this is necessary, consider closing the pull request and sending a separate PR to update 'src'.

I have moved formatToParts to ES2018, and subsequently removed esnext.intl.d.ts, as it was empty after the migration. Everything seems OK, but I'd like a second set of eyes to check if I have completed all of the redirections and removals properly.

Thanks @Scharkee - I've taken this and merged it into 4.5 with #45647