This is missing piece to compose forms in react. I was looking for such functionality for a year and was building custom over complicated typescript generics. Thank you guys for developing this.

Would be very useful to put this in react-hook-form official documentation so that people can find it. Name lenses is not obvious when you looking to compose forms with typescript so when people google for such things they can't find it. I found it by traversing bunch of issues and discussions on react hook form repo.