improvement: flow coverage

src/components/Sidebar/Menu/Menu.js

@@ -1,8 +1,16 @@
+// @flow
 import React from 'react';
 import { Link } from 'gatsby';
 import styles from './Menu.module.scss';
 
-const Menu = ({ menu }) => (
+type Props = {
+  menu: {
+    label: string,
+    path: string
+  }[]
+};
+
+const Menu = ({ menu }: Props) => (
   <nav className={styles['menu']}>
     <ul className={styles['menu__list']}>
       {menu.map((item) => (

src/components/Sidebar/Menu/Menu.test.js

@@ -1,3 +1,4 @@
+// @flow
 import React from 'react';
 import renderer from 'react-test-renderer';
 import Menu from './Menu';

src/components/Sidebar/Menu/index.js

@@ -1 +1,2 @@
+// @flow
 export { default } from './Menu';