[Basic] Add example of passing a `setState` dispatch action to basic prop types

[WillowP]

What cheatsheet is this about? (if applicable)

Basic cheatsheet

What's your issue or idea?

I think it's very common to pass state setters as props, but the type of that function is not obvious.

I suggest adding an entry to basic/getting-started/basic_type_example#basic-prop-types-examples for useState dispatch action.

Example:

setState: React.Dispatch<React.SetStateAction<someType>> // the dispatch action returned by `useState`

[swyxio]

mm agree on the state setter function.

i thiiink that might be a good idea, the nested generics concern me a bit, but PR welcome and i'll tweak if needed

[WillowP]

Okay, PR incoming.

Agree about the nested generics. I think it's needed, because if you just use React.Dispatch<someType> TS doesn't allow you to use the setState(state => newState) option. But if there's a better way I will be very happy :)