Quickstart: Preact

1 Initialize project

npm create vite@latest css-hooks-playground -- --template preact-ts
cd css-hooks-playground
npm install @css-hooks/preact remeda

2 Start dev server

npm run dev

Visit http://localhost:5173 to view changes in real time.

3 Set up CSS Hooks

Create a src/css.ts module with the following contents:

import { createHooks } from "@css-hooks/preact";

export const { styleSheet, on } = createHooks("&:active");

4 Add style sheet

Modify src/main.tsx to add the style sheet to the document:

 import { render } from 'preact'
 import { App } from './app.tsx'
 import './index.css'
+import { styleSheet } from './css.ts'

-render(<App />, document.getElementById('app')!)
+render(
+  <>
+    <style dangerouslySetInnerHTML={{ __html: styleSheet() }} />
+    <App />
+  </>,
+  document.getElementById('app')!
+)

5 Add conditional style

Use the configured &:active hook to implement an effect when the counter button is pressed:

 // src/app.tsx

 import { useState } from 'preact/hooks'
 import preactLogo from './assets/preact.svg'
 import viteLogo from '/vite.svg'
 import './app.css'
+import { on } from './css.ts'
+import { pipe } from 'remeda'

 export function App() {
   const [count, setCount] = useState(0)

   return (
     <>
       <div>
         <a href="https://vitejs.dev" target="_blank">
           <img src={viteLogo} className="logo" alt="Vite logo" />
         </a>
         <a href="https://preactjs.com" target="_blank">
           <img src={preactLogo} className="logo preact" alt="Preact logo" />
         </a>
       </div>
       <h1>Vite + Preact</h1>
       <div className="card">
-        <button onClick={() => setCount((count) => count + 1)}>
+        <button
+          onClick={() => setCount((count) => count + 1)}
+          style={pipe(
+            {
+              transition: "transform 75ms",
+            },
+            on("&:active", {
+              transform: "scale(0.9)"
+            })
+          )}
+        >
           count is {count}
         </button>
         <p>
           Edit <code>src/app.tsx</code> and save to test HMR
         </p>
       </div>
       <p className="read-the-docs">
         Click on the Vite and Preact logos to learn more
       </p>
     </>
   )
 }