Examples: Jotai (#27940)

## Documentation / Examples

- [X] Make sure the linting passes

This adds an example using Jotai with Next.js. It uses the new hook `useHydrateAtoms` to hydrate atoms with values from the server.

examples/with-jotai/.gitignore

@@ -0,0 +1,34 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# vercel
+.vercel

examples/with-jotai/README.md

@@ -0,0 +1,31 @@
+# Jotai example
+
+This example shows how to integrate [Jotai](https://github.com/pmndrs/jotai) in Next.js.
+
+- Jotai is a primitive and flexible state management library for React.
+- Jotai is TypeScript oriented and aims to expose a minimalistic API for dealing with state in a data-flow graph way.
+- Jotai uses the `useHydrateAtoms` hook to hydrate the value of an atom, for values that come from the server.
+
+## Preview
+
+Preview the example live on [StackBlitz](http://stackblitz.com/):
+
+[![Open in StackBlitz](https://developer.stackblitz.com/img/open_in_stackblitz.svg)](https://stackblitz.com/github/vercel/next.js/tree/canary/examples/with-jotai)
+
+## Deploy your own
+
+Deploy the example using [Vercel](https://vercel.com?utm_source=github&utm_medium=readme&utm_campaign=next-example):
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/git/external?repository-url=https://github.com/vercel/next.js/tree/canary/examples/with-jotai&project-name=with-jotai&repository-name=with-jotai)
+
+## How to use
+
+Execute [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app) with [npm](https://docs.npmjs.com/cli/init) or [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) to bootstrap the example:
+
+```bash
+npx create-next-app --example with-jotai with-jotai-app
+# or
+yarn create next-app --example with-jotai with-jotai-app
+```
+
+Deploy it to the cloud with [Vercel](https://vercel.com/new?utm_source=github&utm_medium=readme&utm_campaign=next-example) ([Documentation](https://nextjs.org/docs/deployment)).

examples/with-jotai/next-env.d.ts

@@ -0,0 +1,3 @@
+/// <reference types="next" />
+/// <reference types="next/types/global" />
+/// <reference types="next/image-types/global" />

examples/with-jotai/next.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  reactStrictMode: true,
+}

examples/with-jotai/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "with-jotai",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start"
+  },
+  "dependencies": {
+    "jotai": "1.3.0",
+    "next": "latest",
+    "react": "17.0.2",
+    "react-dom": "17.0.2"
+  },
+  "devDependencies": {
+    "@types/react": "17.0.16",
+    "eslint": "7.32.0",
+    "eslint-config-next": "11.0.1",
+    "typescript": "4.3.5"
+  },
+  "license": "MIT"
+}

examples/with-jotai/pages/_app.tsx

@@ -0,0 +1,6 @@
+import '../styles/globals.css'
+import type { AppProps } from 'next/app'
+
+export default function MyApp({ Component, pageProps }: AppProps) {
+  return <Component {...pageProps} />
+}

examples/with-jotai/pages/api/hello.ts

@@ -0,0 +1,13 @@
+// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
+import type { NextApiRequest, NextApiResponse } from 'next'
+
+type Data = {
+  name: string
+}
+
+export default function handler(
+  req: NextApiRequest,
+  res: NextApiResponse<Data>
+) {
+  res.status(200).json({ name: 'John Doe' })
+}

examples/with-jotai/pages/index.tsx

@@ -0,0 +1,50 @@
+import { GetServerSideProps, InferGetServerSidePropsType } from 'next'
+import Head from 'next/head'
+import Image from 'next/image'
+import styles from '../styles/Home.module.css'
+import { atom, useAtom } from 'jotai'
+import { useAtomValue, useHydrateAtoms } from 'jotai/utils'
+
+const countAtom = atom(0)
+const doubleAtom = atom((get) => get(countAtom) * 2)
+
+export const getServerSideProps: GetServerSideProps<{
+  initialCount: number
+}> = async (context) => {
+  return { props: { initialCount: 42 } }
+}
+
+export default function Home({
+  initialCount,
+}: InferGetServerSidePropsType<typeof getServerSideProps>) {
+  useHydrateAtoms([[countAtom, initialCount]] as const)
+  const [count, setCount] = useAtom(countAtom)
+  const doubleCount = useAtomValue(doubleAtom)
+  return (
+    <div className={styles.container}>
+      <Head>
+        <title>with-jotai</title>
+        <meta name="description" content="Generated by create next app" />
+        <link rel="icon" href="/favicon.ico" />
+      </Head>
+      <h1 className={styles.title}>With Jotai example</h1>
+      <main className={styles.main}>
+        <div>Initial count from the server: {count}</div>
+        <div>Double count: {doubleCount}</div>
+        <button onClick={() => setCount((count) => count + 1)}>+1</button>
+      </main>
+      <footer className={styles.footer}>
+        <a
+          href="https://vercel.com?utm_source=create-next-app&utm_medium=default-template&utm_campaign=create-next-app"
+          target="_blank"
+          rel="noopener noreferrer"
+        >
+          Powered by{' '}
+          <span className={styles.logo}>
+            <Image src="/vercel.svg" alt="Vercel Logo" width={72} height={16} />
+          </span>
+        </a>
+      </footer>
+    </div>
+  )
+}

examples/with-jotai/styles/Home.module.css

@@ -0,0 +1,121 @@
+.container {
+  min-height: 100vh;
+  padding: 0 0.5rem;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+  height: 100vh;
+}
+
+.main {
+  padding: 5rem 0;
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+}
+
+.footer {
+  width: 100%;
+  height: 100px;
+  border-top: 1px solid #eaeaea;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+}
+
+.footer a {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  flex-grow: 1;
+}
+
+.title a {
+  color: #0070f3;
+  text-decoration: none;
+}
+
+.title a:hover,
+.title a:focus,
+.title a:active {
+  text-decoration: underline;
+}
+
+.title {
+  margin: 0;
+  line-height: 1.15;
+  font-size: 4rem;
+}
+
+.title,
+.description {
+  text-align: center;
+}
+
+.description {
+  line-height: 1.5;
+  font-size: 1.5rem;
+}
+
+.code {
+  background: #fafafa;
+  border-radius: 5px;
+  padding: 0.75rem;
+  font-size: 1.1rem;
+  font-family: Menlo, Monaco, Lucida Console, Liberation Mono, DejaVu Sans Mono,
+    Bitstream Vera Sans Mono, Courier New, monospace;
+}
+
+.grid {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-wrap: wrap;
+  max-width: 800px;
+  margin-top: 3rem;
+}
+
+.card {
+  margin: 1rem;
+  padding: 1.5rem;
+  text-align: left;
+  color: inherit;
+  text-decoration: none;
+  border: 1px solid #eaeaea;
+  border-radius: 10px;
+  transition: color 0.15s ease, border-color 0.15s ease;
+  width: 45%;
+}
+
+.card:hover,
+.card:focus,
+.card:active {
+  color: #0070f3;
+  border-color: #0070f3;
+}
+
+.card h2 {
+  margin: 0 0 1rem 0;
+  font-size: 1.5rem;
+}
+
+.card p {
+  margin: 0;
+  font-size: 1.25rem;
+  line-height: 1.5;
+}
+
+.logo {
+  height: 1em;
+  margin-left: 0.5rem;
+}
+
+@media (max-width: 600px) {
+  .grid {
+    width: 100%;
+    flex-direction: column;
+  }
+}

examples/with-jotai/styles/globals.css

@@ -0,0 +1,16 @@
+html,
+body {
+  padding: 0;
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen,
+    Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;
+}
+
+a {
+  color: inherit;
+  text-decoration: none;
+}
+
+* {
+  box-sizing: border-box;
+}

examples/with-jotai/tsconfig.json

@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "lib": ["dom", "dom.iterable", "esnext"],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "forceConsistentCasingInFileNames": true,
+    "noEmit": true,
+    "esModuleInterop": true,
+    "module": "esnext",
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "preserve"
+  },
+  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx"],
+  "exclude": ["node_modules"]
+}