Regarding 3, you actually can use PropTypes to define the shape of an object passed as a prop using PropTypes.shape({...})! You can also specify the types of all of the keys of the object.
I find this super useful in many of my projects, I hope it helps with some of yours!
I find this super useful in many of my projects, I hope it helps with some of yours!
https://reactjs.org/docs/typechecking-with-proptypes.html