Proposal: check that useSelector() returning a new object uses an equalityFn

[Attila Szeremi]

As per the docs here, if you pass a selector callback that returns a new object to useSelector() (e.g. useSelector(state => ({prop: state.someReducer.prop})), then the component will re-render on any state change in the entire store. Thus the docs suggest that you pass an equalityFn as the 2nd parameter to useSelector(); typically shallowEqual that is shipped with react-redux.

It would be cool if the eslint plugin provided a way to enforce this. My colleagues wrote a bunch of useSelector() calls with selectors returning new callbacks, without passing a 2nd argument (shallowEqual).