I reported typescript install size issue back in 2018 and changing to modules seemed to have the biggest impact here!
https://github.com/microsoft/TypeScript/issues/23339
For anyone curious, TS 1.0 was 7MB and today it’s 65MB.
https://packagephobia.com/result?p=typescript%401.0.1%2Ctype...
Really excited to see this number move in the downward direction for a change :)