feat(example): React19 + Shadcn example with Tailwind CSS4 integration

examples/react-shadcn-tailwind-starter/README.md

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+---
+name: React19 Starter Template With Shadcn and TailwindCSS4
+description: This template should help get you started developing with React + TailwindCSS + Shadcn in WXT.
+---
+
+```sh
+npm i
+npm run dev
+```
+
+### Prerequisites
+
+Ensure you have the following software installed:
+
+- **Node.js:** Version 20 or higher
+- **React.js:** Version 19 or higher
+- **Tailwind CSS:** Version 4 or higher
+- **Shadcn UI:** Version 0.9.5 or higher

examples/react-shadcn-tailwind-starter/package.json

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+{
+  "name": "wxt-react-shadcn-tailwindcss-starter",
+  "description": "React shadcn UI example with Tailwind CSS integration.",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "wxt",
+    "dev:firefox": "wxt -b firefox",
+    "build": "wxt build",
+    "build:firefox": "wxt build -b firefox",
+    "zip": "wxt zip",
+    "zip:firefox": "wxt zip -b firefox",
+    "compile": "tsc --noEmit",
+    "postinstall": "wxt prepare"
+  },
+  "dependencies": {
+    "@radix-ui/react-slot": "^1.1.2",
+    "@tailwindcss/vite": "^4.0.17",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "lucide-react": "^0.484.0",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "tailwind-merge": "^3.0.2",
+    "tailwindcss": "^4.0.17",
+    "tw-animate-css": "^1.2.4"
+  },
+  "devDependencies": {
+    "@types/chrome": "^0.0.280",
+    "@types/node": "^22.13.14",
+    "@types/react": "^19.0.1",
+    "@types/react-dom": "^19.0.2",
+    "@wxt-dev/module-react": "^1.1.2",
+    "typescript": "^5.6.3",
+    "wxt": "^0.19.29"
+  }
+}

examples/react-shadcn-tailwind-starter/src/components/ui/button.tsx

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+import * as React from "react"
+import { Slot } from "@radix-ui/react-slot"
+import { cva, type VariantProps } from "class-variance-authority"
+
+import { cn } from "@/utils/utils"
+
+const buttonVariants = cva(
+  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-all disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 shrink-0 [&_svg]:shrink-0 outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px] aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
+  {
+    variants: {
+      variant: {
+        default:
+          "bg-primary text-primary-foreground shadow-xs hover:bg-primary/90",
+        destructive:
+          "bg-destructive text-white shadow-xs hover:bg-destructive/90 focus-visible:ring-destructive/20 dark:focus-visible:ring-destructive/40 dark:bg-destructive/60",
+        outline:
+          "border bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:bg-input/30 dark:border-input dark:hover:bg-input/50",
+        secondary:
+          "bg-secondary text-secondary-foreground shadow-xs hover:bg-secondary/80",
+        ghost:
+          "hover:bg-accent hover:text-accent-foreground dark:hover:bg-accent/50",
+        link: "text-primary underline-offset-4 hover:underline",
+      },
+      size: {
+        default: "h-9 px-4 py-2 has-[>svg]:px-3",
+        sm: "h-8 rounded-md gap-1.5 px-3 has-[>svg]:px-2.5",
+        lg: "h-10 rounded-md px-6 has-[>svg]:px-4",
+        icon: "size-9",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+      size: "default",
+    },
+  }
+)
+
+function Button({
+  className,
+  variant,
+  size,
+  asChild = false,
+  ...props
+}: React.ComponentProps<"button"> &
+  VariantProps<typeof buttonVariants> & {
+    asChild?: boolean
+  }) {
+  const Comp = asChild ? Slot : "button"
+
+  return (
+    <Comp
+      data-slot="button"
+      className={cn(buttonVariants({ variant, size, className }))}
+      {...props}
+    />
+  )
+}
+
+export { Button, buttonVariants }

examples/react-shadcn-tailwind-starter/src/entrypoints/background.ts

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+export default defineBackground(() => {
+  console.log('Hello background!', { id: browser.runtime.id });
+});

examples/react-shadcn-tailwind-starter/src/entrypoints/content.ts

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+export default defineContentScript({
+  matches: ['*://*.google.com/*'],
+  main() {
+    console.log('Hello content.');
+  },
+});

examples/react-shadcn-tailwind-starter/src/entrypoints/popup/App.css

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+#root {
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}
+
+.logo {
+  height: 6em;
+  padding: 1.5em;
+  will-change: filter;
+  transition: filter 300ms;
+}
+.logo:hover {
+  filter: drop-shadow(0 0 2em #54bc4ae0);
+}
+.logo.react:hover {
+  filter: drop-shadow(0 0 2em #61dafbaa);
+}
+
+@keyframes logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  a:nth-of-type(2) .logo {
+    animation: logo-spin infinite 20s linear;
+  }
+}
+
+.card {
+  padding: 2em;
+}
+
+.read-the-docs {
+  color: #888;
+}

examples/react-shadcn-tailwind-starter/src/entrypoints/popup/App.tsx

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+import { useState } from 'react';
+import { Button } from '@/components/ui/button';
+import reactLogo from '@/assets/react.svg';
+import shadcnLogo from '@/assets/shadcn.png';
+import tailwindcssLogo from '@/assets/tailwind.svg';
+import wxtLogo from '/wxt.svg';
+import './App.css';
+
+function App() {
+  const [count, setCount] = useState(0);
+
+  return (
+    <div className="min-w-[350px] flex flex-col items-center justify-center min-h-[400px]">
+      <div className="flex space-x-4">
+        <a href="https://wxt.dev" target="_blank" rel="noopener noreferrer">
+          <img src={wxtLogo} className="w-12 h-12" alt="WXT logo" />
+        </a>
+        <a href="https://react.dev" target="_blank" rel="noopener noreferrer">
+          <img src={reactLogo} className="w-12 h-12" alt="React logo" />
+        </a>
+        <a href="https://ui.shadcn.com" target="_blank" rel="noopener noreferrer">
+          <img src={shadcnLogo} className="w-12 h-12" alt="Shadcn logo" />
+        </a>
+        <a href="https://tailwindcss.com/" target="_blank" rel="noopener noreferrer">
+          <img src={tailwindcssLogo} className="w-12 h-12" alt="TailwindCSS logo" />
+        </a>
+      </div>
+      <h1 className="text-xl font-bold text-gray-900 mt-6">WXT + React 19 + Shadcn + TailwindCSS 4</h1>
+      <div className="card mt-4">
+        <Button onClick={() => setCount((count) => count + 1)}>
+          Count is {count}
+        </Button>
+        <p className="mt-2 text-gray-600">
+          Edit <code className="font-mono text-sm text-gray-800">src/entrypoints/popup/App.tsx</code> and save to test HMR
+        </p>
+      </div>
+      <p className="read-the-docs mt-4 text-gray-500">
+        Click on WXT, React, Shadcn and TailwindCSS logos to learn more
+      </p>
+    </div>
+  );
+}
+
+export default App;

examples/react-shadcn-tailwind-starter/src/entrypoints/popup/index.html

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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Default Popup Title</title>
+    <meta name="manifest.type" content="browser_action" />
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="./main.tsx"></script>
+  </body>
+</html>

examples/react-shadcn-tailwind-starter/src/entrypoints/popup/main.tsx

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+import React from 'react';
+import ReactDOM from 'react-dom/client';
+import App from './App.tsx';
+import './style.css';
+
+ReactDOM.createRoot(document.getElementById('root')!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+);

examples/react-shadcn-tailwind-starter/src/entrypoints/popup/style.css

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+@import "tailwindcss";
+@import "tw-animate-css";
+
+@custom-variant dark (&:is(.dark *));
+
+:root {
+  --background: oklch(1 0 0);
+  --foreground: oklch(0.145 0 0);
+  --card: oklch(1 0 0);
+  --card-foreground: oklch(0.145 0 0);
+  --popover: oklch(1 0 0);
+  --popover-foreground: oklch(0.145 0 0);
+  --primary: oklch(0.205 0 0);
+  --primary-foreground: oklch(0.985 0 0);
+  --secondary: oklch(0.97 0 0);
+  --secondary-foreground: oklch(0.205 0 0);
+  --muted: oklch(0.97 0 0);
+  --muted-foreground: oklch(0.556 0 0);
+  --accent: oklch(0.97 0 0);
+  --accent-foreground: oklch(0.205 0 0);
+  --destructive: oklch(0.577 0.245 27.325);
+  --destructive-foreground: oklch(0.577 0.245 27.325);
+  --border: oklch(0.922 0 0);
+  --input: oklch(0.922 0 0);
+  --ring: oklch(0.708 0 0);
+  --chart-1: oklch(0.646 0.222 41.116);
+  --chart-2: oklch(0.6 0.118 184.704);
+  --chart-3: oklch(0.398 0.07 227.392);
+  --chart-4: oklch(0.828 0.189 84.429);
+  --chart-5: oklch(0.769 0.188 70.08);
+  --radius: 0.625rem;
+  --sidebar: oklch(0.985 0 0);
+  --sidebar-foreground: oklch(0.145 0 0);
+  --sidebar-primary: oklch(0.205 0 0);
+  --sidebar-primary-foreground: oklch(0.985 0 0);
+  --sidebar-accent: oklch(0.97 0 0);
+  --sidebar-accent-foreground: oklch(0.205 0 0);
+  --sidebar-border: oklch(0.922 0 0);
+  --sidebar-ring: oklch(0.708 0 0);
+}
+
+.dark {
+  --background: oklch(0.145 0 0);
+  --foreground: oklch(0.985 0 0);
+  --card: oklch(0.145 0 0);
+  --card-foreground: oklch(0.985 0 0);
+  --popover: oklch(0.145 0 0);
+  --popover-foreground: oklch(0.985 0 0);
+  --primary: oklch(0.985 0 0);
+  --primary-foreground: oklch(0.205 0 0);
+  --secondary: oklch(0.269 0 0);
+  --secondary-foreground: oklch(0.985 0 0);
+  --muted: oklch(0.269 0 0);
+  --muted-foreground: oklch(0.708 0 0);
+  --accent: oklch(0.269 0 0);
+  --accent-foreground: oklch(0.985 0 0);
+  --destructive: oklch(0.396 0.141 25.723);
+  --destructive-foreground: oklch(0.637 0.237 25.331);
+  --border: oklch(0.269 0 0);
+  --input: oklch(0.269 0 0);
+  --ring: oklch(0.439 0 0);
+  --chart-1: oklch(0.488 0.243 264.376);
+  --chart-2: oklch(0.696 0.17 162.48);
+  --chart-3: oklch(0.769 0.188 70.08);
+  --chart-4: oklch(0.627 0.265 303.9);
+  --chart-5: oklch(0.645 0.246 16.439);
+  --sidebar: oklch(0.205 0 0);
+  --sidebar-foreground: oklch(0.985 0 0);
+  --sidebar-primary: oklch(0.488 0.243 264.376);
+  --sidebar-primary-foreground: oklch(0.985 0 0);
+  --sidebar-accent: oklch(0.269 0 0);
+  --sidebar-accent-foreground: oklch(0.985 0 0);
+  --sidebar-border: oklch(0.269 0 0);
+  --sidebar-ring: oklch(0.439 0 0);
+}
+
+@theme inline {
+  --color-background: var(--background);
+  --color-foreground: var(--foreground);
+  --color-card: var(--card);
+  --color-card-foreground: var(--card-foreground);
+  --color-popover: var(--popover);
+  --color-popover-foreground: var(--popover-foreground);
+  --color-primary: var(--primary);
+  --color-primary-foreground: var(--primary-foreground);
+  --color-secondary: var(--secondary);
+  --color-secondary-foreground: var(--secondary-foreground);
+  --color-muted: var(--muted);
+  --color-muted-foreground: var(--muted-foreground);
+  --color-accent: var(--accent);
+  --color-accent-foreground: var(--accent-foreground);
+  --color-destructive: var(--destructive);
+  --color-destructive-foreground: var(--destructive-foreground);
+  --color-border: var(--border);
+  --color-input: var(--input);
+  --color-ring: var(--ring);
+  --color-chart-1: var(--chart-1);
+  --color-chart-2: var(--chart-2);
+  --color-chart-3: var(--chart-3);
+  --color-chart-4: var(--chart-4);
+  --color-chart-5: var(--chart-5);
+  --radius-sm: calc(var(--radius) - 4px);
+  --radius-md: calc(var(--radius) - 2px);
+  --radius-lg: var(--radius);
+  --radius-xl: calc(var(--radius) + 4px);
+  --color-sidebar: var(--sidebar);
+  --color-sidebar-foreground: var(--sidebar-foreground);
+  --color-sidebar-primary: var(--sidebar-primary);
+  --color-sidebar-primary-foreground: var(--sidebar-primary-foreground);
+  --color-sidebar-accent: var(--sidebar-accent);
+  --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
+  --color-sidebar-border: var(--sidebar-border);
+  --color-sidebar-ring: var(--sidebar-ring);
+}
+
+@layer base {
+  * {
+    @apply border-border outline-ring/50;
+  }
+  body {
+    @apply bg-background text-foreground;
+  }
+}
+
+:root {
+  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
+  line-height: 1.5;
+  font-weight: 400;
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+  -webkit-text-size-adjust: 100%;
+}