Function useState

packages/react-server/src/ReactFizzHooks.js:345–356

(
  initialState: (() => S) | S,
)

}

export function useState<S>(
  initialState: (() => S) | S,
): [S, Dispatch<BasicStateAction<S>>] {
  if (__DEV__) {
    currentHookNameInDev = 'useState';
  }
  return useReducer(
    basicStateReducer,
    // useReducer has a special case to support lazy useState initializers
    (initialState: any),
  );
}

export function useReducer<S, I, A>(
  reducer: (S, A) => S,