Function useContext

packages/react-reconciler/src/ReactFiberHooks.js:4022–4026

(context: ReactContext<T>)

      return mountCallback(callback, deps);
    },
    useContext<T>(context: ReactContext<T>): T {
      currentHookNameInDev = 'useContext';
      mountHookTypesDev();
      return readContext(context);
    },
    useEffect(
      create: () => (() => void) | void,
      deps: Array<mixed> | void | null,