Fix linting errors.

src/components/Layout/Layout.js

@@ -9,7 +9,8 @@ import styles from './Layout.module.scss';
 type Props = {
   children: ReactNode,
   title: string,
-  description?: string
+  description?: string,
+  socialImage? :string
 };
 
 const Layout = ({ children, title, description, socialImage }: Props) => {

src/components/Layout/Layout.test.js

@@ -4,6 +4,7 @@ import renderer from 'react-test-renderer';
 import { useStaticQuery, StaticQuery } from 'gatsby';
 import siteMetadata from '../../../jest/__fixtures__/site-metadata';
 import Layout from './Layout';
+import type { RenderCallback } from '../../types';
 
 describe('Layout', () => {
   const props = {

src/types/index.js

@@ -34,6 +34,7 @@ export type Node = {
     category?: string,
     tags?: string[],
     title: string,
+    socialImage?: string
   },
   html: string,
   id: string