Add Next.js example to check bundle size on web

.github/workflows/check-bundle-size.yml

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+name: Check bundle size on web
+on:
+  pull_request:
+    paths:
+      - .github/workflows/check-bundle-size.yml
+      - 'src/**'
+      - 'NextExample/**'
+      - '*'
+  push:
+    branches:
+      - main
+
+env:
+  MAX_SIZE_KB: 30
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    concurrency:
+      group: check-bundle-size-${{ github.ref }}
+      cancel-in-progress: true
+    steps:
+      - name: Checkout Git repository
+        uses: actions/checkout@v3
+
+      - name: Install Reanimated node_modules
+        run: yarn install --frozen-lockfile
+
+      - name: Build Reanimated package
+        run: ./createNPMPackage.sh nightly
+
+      - name: Install NextExample node_modules
+        working-directory: NextExample
+        run: yarn install --frozen-lockfile
+
+      - name: Install Reanimated package
+        working-directory: NextExample
+        run: yarn add file:`find .. -name "react-native-reanimated-*.tgz"`
+
+      - name: Compile production build
+        working-directory: NextExample
+        run: yarn next build | tee output.txt
+
+      - name: Check bundle size
+        working-directory: NextExample
+        run: if [[ $SIZE_KB -gt $MAX_SIZE_KB ]]; then false || echo "Bundle size is greater than $MAX_SIZE_KB kB." ; fi

NextExample/.gitignore

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+# 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*
+.pnpm-debug.log*
+
+# local env files
+.env*.local
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts
+
+.expo
+.node_modules
+.next

NextExample/.prettierrc

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+{
+  "semi": false,
+  "useTabs": false,
+  "singleQuote": true
+}

NextExample/README.md

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+# React Native Web example
+
+This example features how to use [react-native-web](https://github.com/necolas/react-native-web) to bring the platform-agnostic Components and APIs of React Native to the web.
+
+> **High-quality user interfaces**: React Native for Web makes it easy to create fast, adaptive web UIs in JavaScript. It provides native-like interactions, support for multiple input modes (touch, mouse, keyboard), optimized vendor-prefixed styles, built-in support for RTL layout, built-in accessibility, and integrates with React Dev Tools.
+>
+> **Write once, render anywhere**: React Native for Web interoperates with existing React DOM components and is compatible with the majority of the React Native API. You can develop new components for native and web without rewriting existing code. React Native for Web can also render to HTML and critical CSS on the server using Node.js.
+
+## Deploy your own
+
+Deploy the example using [Vercel](https://vercel.com?utm_source=github&utm_medium=readme&utm_campaign=next-example) or preview live with [StackBlitz](https://stackblitz.com/github/vercel/next.js/tree/canary/examples/with-react-native-web)
+
+[![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-react-native-web&project-name=with-react-native-web&repository-name=with-react-native-web)
+
+## 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), [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/), or [pnpm](https://pnpm.io) to bootstrap the example:
+
+```bash
+npx create-next-app --example with-react-native-web with-react-native-web-app
+```
+
+```bash
+yarn create next-app --example with-react-native-web with-react-native-web-app
+```
+
+```bash
+pnpm create next-app --example with-react-native-web with-react-native-web-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)).

NextExample/app.json

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+{
+  "name": "NextExample",
+  "displayName": "NextExample"
+}

NextExample/babel.config.js

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+module.exports = {
+  presets: ['next/babel', ['babel-preset-expo', { jsxRuntime: 'automatic' }]],
+  plugins: [
+    ['@babel/plugin-proposal-class-properties', { loose: true }],
+    ['@babel/plugin-proposal-private-methods', { loose: true }],
+    ['@babel/plugin-proposal-private-property-in-object', { loose: true }],
+    'react-native-reanimated/plugin',
+  ],
+}

NextExample/next.config.js

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+// @ts-check
+
+const enabled = process.env.ANALYZE === 'true'
+
+if (enabled) {
+  console.log('[next-config] Analyzing bundle size...')
+}
+
+const withNextBundleAnalyzer = require('@next/bundle-analyzer')({
+  enabled,
+})
+
+const withTM = require('next-transpile-modules')(['react-native-reanimated'])
+
+const compose = require('next-compose-plugins')
+
+const { withExpo } = require('@expo/next-adapter')
+
+module.exports = compose(
+  [withTM, withNextBundleAnalyzer, [withExpo, { projectRoot: __dirname }]],
+  /** @type {import('next').NextConfig} */
+  {
+    webpack5: true,
+    eslint: {
+      ignoreDuringBuilds: true,
+    },
+    webpack(config, _options) {
+      // config.resolve.alias = {
+      //   ...config.resolve.alias,
+      //   'react-native-reanimated': require('path').resolve(
+      //     __dirname,
+      //     'lib/react-native-reanimated/src/index.js'
+      //   ),
+      // }
+
+      return config
+    },
+  }
+)

NextExample/package.json

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+{
+  "private": true,
+  "scripts": {
+    "dev": "next",
+    "build": "next build",
+    "start": "next start",
+    "analyze": "ANALYZE=true next build",
+    "cache:clear": "rm -rf .expo .next node_modules/.cache"
+  },
+  "dependencies": {
+    "next": "latest",
+    "raf": "^3.4.1",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0",
+    "react-native-reanimated": "3.0.0-rc.3",
+    "react-native-web": "^0.18.9"
+  },
+  "devDependencies": {
+    "@expo/config": "^7.0.1",
+    "@expo/next-adapter": "^4.0.12",
+    "@next/bundle-analyzer": "^12.3.1",
+    "babel-plugin-react-native-web": "^0.18.9",
+    "next-compose-plugins": "^2.2.1",
+    "next-transpile-modules": "^9.0.0"
+  }
+}

NextExample/pages/_app.js

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+import 'raf/polyfill'
+
+export default function MyApp({ Component, pageProps }) {
+  return <Component {...pageProps} />
+}

NextExample/pages/_document.js

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+export { default } from '@expo/next-adapter/document'

NextExample/pages/index.js

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+import { StyleSheet, Text, View } from 'react-native'
+
+const styles = StyleSheet.create({
+  container: {
+    alignItems: 'center',
+    flexGrow: 1,
+    justifyContent: 'center',
+  },
+  link: {
+    color: 'blue',
+  },
+  textContainer: {
+    alignItems: 'center',
+    marginTop: 16,
+  },
+  text: {
+    alignItems: 'center',
+    fontSize: 24,
+    marginBottom: 24,
+  },
+})
+
+export default function App(props) {
+  return (
+    <View style={styles.container}>
+      <Text accessibilityRole="header" style={styles.text}>
+        React Native for Web & Next.js
+      </Text>
+
+      <Text style={styles.link} accessibilityRole="link" href={`/alternate`}>
+        A universal link
+      </Text>
+
+      <View style={styles.textContainer}>
+        <Text accessibilityRole="header" aria-level="2" style={styles.text}>
+          Subheader
+        </Text>
+      </View>
+    </View>
+  )
+}

NextExample/pages/reanimated.js

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+import Animated, {
+  useAnimatedStyle,
+  useSharedValue,
+  withRepeat,
+  withTiming,
+} from 'react-native-reanimated'
+import { StyleSheet, View } from 'react-native'
+
+import { useEffect } from 'react'
+
+export default function App() {
+  const sv = useSharedValue(0)
+
+  useEffect(() => {
+    sv.value = 0
+    sv.value = withRepeat(withTiming(1), -1, true)
+  })
+
+  const animatedStyle = useAnimatedStyle(() => {
+    return {
+      width: sv.value * 200 + 10,
+    }
+  })
+
+  return (
+    <View style={styles.container}>
+      <Animated.View style={[styles.box, animatedStyle]} />
+    </View>
+  )
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: '#fff',
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  box: {
+    height: 100,
+    backgroundColor: 'blue',
+  },
+})