[EXAMPLE] with-cssed (#16735)

Adding an example with [cssed](https://github.com/okotoki/cssed). A custom styling solution, which extracts CSS from template literals into separate files.

[EXAMPLE] with-cssed (#16735)
Adding an example with [cssed](https://github.com/okotoki/cssed). A custom styling solution, which extracts CSS from template literals into separate files.
134bcf8d · Eugene C · GitHub · 2acb53bd · 134bcf8d · 134bcf8d
6 changed file
--- a/examples/with-cssed/.babelrc
+++ b/examples/with-cssed/.babelrc
+{
+  "presets": [
+    "next/babel"
+  ],
+  "plugins": [
+    "babel-plugin-macros"
+  ]
+}
--- a/examples/with-cssed/.gitignore
+++ b/examples/with-cssed/.gitignore
+# 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
+
+# cssed compilation artifacts
+.*.module.css
--- a/examples/with-cssed/README.md
+++ b/examples/with-cssed/README.md
+# Example app with cssed
+
+This example shows how to use [cssed](https://github.com/okotoki/cssed), a CSS-in-JS library, with Next.js.
+
+We are creating `div` element with local scoped styles. The styles includes the use of pseudo-selector.
+
+## 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-cssed)
+
+## 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-cssed with-cssed-app
+# or
+yarn create next-app --example with-cssed with-cssed-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)).
--- a/examples/with-cssed/lib/theme.js
+++ b/examples/with-cssed/lib/theme.js
+export const dark = '#333'
+export const light = '#ddd'
--- a/examples/with-cssed/package.json
+++ b/examples/with-cssed/package.json
+{
+  "name": "with-cssed",
+  "version": "1.0.0",
+  "scripts": {
+    "dev": "next",
+    "build": "next build",
+    "start": "next start"
+  },
+  "dependencies": {
+    "@types/react": "^16.9.48",
+    "babel-plugin-macros": "^2.8.0",
+    "cssed": "^1.1.2",
+    "next": "latest",
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1"
+  },
+  "license": "MIT"
+}
--- a/examples/with-cssed/pages/index.js
+++ b/examples/with-cssed/pages/index.js
+import { css } from 'cssed/macro'
+import Head from 'next/head'
+import { useState } from 'react'
+
+import { dark, light } from '../lib/theme'
+
+const styles = css`
+  .box {
+    height: 200px;
+    width: 200px;
+    margin: 0 auto;
+    margin-top: 40px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+  }
+
+  .dark {
+    background-color: ${dark};
+  }
+  .dark::before {
+    content: '🌚';
+  }
+  .light {
+    background-color: ${light};
+  }
+  .light::before {
+    content: '🌞';
+  }
+`
+
+export default function Home() {
+  const [isDark, setDark] = useState(false)
+  return (
+    <>
+      <Head>
+        <title>With cssed</title>
+      </Head>
+      <div
+        onClick={() => setDark(!isDark)}
+        className={styles.box + ' ' + (isDark ? styles.dark : styles.light)}
+      >
+        Cssed demo
+      </div>
+    </>
+  )
+}