I was a little amazed when reading this thread on designernews about how designers hand animations off to developers.. Hardly any mention of Framer?
Also you don't just hand it off. Either do it yourself or sit closely with the developer and share some knowledge.
How to use the Framer spring in Swift?
I have worked on a couple web prototypes, I used GSAP with Framer. Devs are able to just reuse the code that I have written. Literally copy & paste.