[with-firebase] Update to Node v10 and fix lint errors (#9318)

* Changed the version of node from 8 to 10

* fix lint errors

examples/with-firebase-hosting-and-typescript/package.json

@@ -3,7 +3,7 @@
   "version": "1.0.0",
   "description": "Host Next.js SSR app on Firebase Cloud Functions with Firebase Hosting redirects. Built with typescript.",
   "engines": {
-    "node": "8"
+    "node": "10"
   },
   "scripts": {
     "dev": "next src/app",

examples/with-firebase-hosting-and-typescript/src/app/components/App.tsx

-import Header from './Header'
+import Header from './Header';
 
 const App = ({ children }: { children?: any }) => (
   <main>
     <Header />
     {children}
   </main>
-)
+);
 
-export default App
+export default App;

examples/with-firebase-hosting-and-typescript/src/app/components/Header.tsx

-import Link from 'next/link'
+import Link from 'next/link';
 
 export default ({ pathname }: { pathname?: any }) => (
   <header>
-    <Link href="/">
+    <Link href='/'>
       <a className={pathname === '/' ? 'is-active' : ''}>Home</a>
     </Link>
-    <Link href="/about">
+    <Link href='/about'>
       <a className={pathname === '/about' ? 'is-active' : ''}>About</a>
     </Link>
   </header>
-)
+);

examples/with-firebase-hosting-and-typescript/src/app/pages/about.tsx

-import App from '../components/App'
+import App from '../components/App';
 
 export default () => (
   <App>
     <p>About Page</p>
   </App>
-)
+);

examples/with-firebase-hosting-and-typescript/src/app/pages/index.tsx

-import App from '../components/App'
+import App from '../components/App';
 
 export default () => (
   <App>
     <p>Index Page</p>
   </App>
-)
+);