You can totally mix Framer with other frameworks, but keep in mind that Framer was built for prototyping, not production. To quote our site:
Since Framer is a prototyping toolkit, extensive browser compability is not a priority. Our main goal is achieving optimal performance, to get high framerates and smooth animations.
Thank you for reply. Actually i succeeded yesterday, by importing all of files framer studio created. and Its performance is well done. If no problem about license, can i use like it?
Framer is MIT licensed, so you can basically do anything you like.