Create next.js example for pullstate

examples/with-pullstate/.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*
+
+# local env files
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# vercel
+.vercel

examples/with-pullstate/README.md

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+# Pullstate example
+
+This example shows how to integrate Pullstate in Next.js.
+
+In the example we are going to display how to toggle dark mode using the store from pullstate.
+
+## Deploy your own
+
+Deploy the example using [Vercel](https://vercel.com):
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/import/project?template=https://github.com/vercel/next.js/tree/canary/examples/with-pullstate)
+
+## 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-pullstate with-pullstate-app
+# or
+yarn create next-app --example with-pullstate with-pullstate-app
+```
+
+Deploy it to the cloud with [Vercel](https://vercel.com/import?filter=next.js&utm_source=github&utm_medium=readme&utm_campaign=next-example) ([Documentation](https://nextjs.org/docs/deployment)).

examples/with-pullstate/components/dark-mode-demo.js

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+import { PullstateCore } from '../stores'
+
+export default function DarkModeDemo() {
+  const { UIStore } = PullstateCore.useStores()
+  const isDarkMode = UIStore.useState((s) => s.isDarkMode)
+
+  return (
+    <div
+      style={{
+        backgroundColor: isDarkMode ? '#333' : '#CCC',
+        color: isDarkMode ? '#CCC' : '#333',
+      }}
+    >
+      <h1>Pullstate Demo</h1>
+
+      <p>Dark Mode is {isDarkMode ? 'On' : 'Off'}</p>
+
+      <button
+        onClick={() =>
+          UIStore.update((s) => {
+            s.isDarkMode = !s.isDarkMode
+          })
+        }
+      >
+        Toggle Dark Mode
+      </button>
+    </div>
+  )
+}

examples/with-pullstate/package.json

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+{
+  "name": "with-pullstate",
+  "version": "1.0.0",
+  "scripts": {
+    "dev": "next",
+    "build": "next build",
+    "start": "next start"
+  },
+  "dependencies": {
+    "next": "latest",
+    "pullstate": "1.20.4",
+    "react": "^16.9.0",
+    "react-dom": "^16.9.0"
+  },
+  "license": "MIT"
+}

examples/with-pullstate/pages/_app.js

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+import { PullstateProvider } from 'pullstate'
+
+import { useHydrate } from '../stores'
+
+export default function App({ Component, pageProps }) {
+  const instance = useHydrate(pageProps.snapshot)
+
+  return (
+    <PullstateProvider instance={instance}>
+      <Component {...pageProps} />
+    </PullstateProvider>
+  )
+}

examples/with-pullstate/pages/index.js

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+import DarkModeDemo from '../components/dark-mode-demo'
+
+export default function Home() {
+  return <DarkModeDemo />
+}

examples/with-pullstate/pages/ssg.js

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+import DarkModeDemo from '../components/dark-mode-demo'
+
+export default function SSG() {
+  return <DarkModeDemo />
+}
+
+export async function getStaticProps() {
+  const instance = PullstateCore.instantiate()
+
+  // Example of fetching data from some api
+  const preferences = await new Promise((resolve) =>
+    resolve({ isDarkMode: false })
+  )
+
+  // Update the store on the server before page render
+  instance.stores.UIStore.update((s) => {
+    s.isDarkMode = preferences.isDarkMode
+  })
+
+  return {
+    props: {
+      snapshot: JSON.stringify(instance.getPullstateSnapshot()),
+    },
+  }
+}

examples/with-pullstate/pages/ssr.js

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+import DarkModeDemo from '../components/dark-mode-demo'
+import { PullstateCore } from '../stores'
+
+export default function SSR() {
+  return <DarkModeDemo />
+}
+
+export async function getServerSideProps() {
+  const instance = PullstateCore.instantiate({ ssr: true })
+
+  // Example of fetching data from some api
+  const preferences = await new Promise((resolve) =>
+    resolve({ isDarkMode: false })
+  )
+
+  // Update the store on the server before page load
+  instance.stores.UIStore.update((s) => {
+    s.isDarkMode = preferences.isDarkMode
+  })
+
+  return {
+    props: {
+      snapshot: JSON.stringify(instance.getPullstateSnapshot()),
+    },
+  }
+}

examples/with-pullstate/stores/index.js

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+import { createPullstateCore } from 'pullstate'
+import { useMemo } from 'react'
+
+import { UIStore } from './ui'
+
+export const PullstateCore = createPullstateCore({
+  UIStore,
+})
+
+export function useHydrate(snapshot) {
+  return useMemo(() => {
+    if (!snapshot) return PullstateCore.instantiate()
+    return PullstateCore.instantiate({ hydrateSnapshot: JSON.parse(snapshot) })
+  }, [snapshot])
+}

examples/with-pullstate/stores/ui.js

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+import { Store } from 'pullstate'
+
+export const UIStore = new Store({ isDarkMode: true })