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+#
React Scan
+
+React Scan automatically detects performance issues in your React app.
+
+- Requires no code changes -- just drop it in
+- Highlights exactly the components you need to optimize
+- Always accessible through a toolbar on page
+
+### Quick Start
+
+```bash
+npx -y react-scan@latest init
+```
+
+### [**Try out a demo! →**](https://react-scan.million.dev)
+
+
+## Install
+
+The `init` command will automatically detect your framework, install `react-scan` via npm, and set up your project.
+
+```bash
+npx -y react-scan@latest init
+```
+
+### Manual Installation
+
+Install the package:
+
+```bash
+npm install -D react-scan
+```
+
+Then add the script tag to your app. Pick the guide for your framework:
+
+#### Script Tag
+
+Paste this before any scripts in your `index.html`:
+
+```html
+
+
+```
+
+#### Next.js (App Router)
+
+Add this inside of your `app/layout.tsx`:
+
+```tsx
+import Script from "next/script";
+
+export default function RootLayout({ children }) {
+ return (
+
+
+
+
+ {children}
+
+ );
+}
+```
+
+#### Next.js (Pages Router)
+
+Add this into your `pages/_document.tsx`:
+
+```tsx
+import { Html, Head, Main, NextScript } from "next/document";
+import Script from "next/script";
+
+export default function Document() {
+ return (
+
+
+
+
+
+
+
+
+
+ );
+}
+```
+
+#### Vite
+
+Example `index.html` with React Scan enabled:
+
+```html
+
+
+
+
+
+
+
+
+
+
+```
+
+#### Remix
+
+Add this inside your `app/root.tsx`:
+
+```tsx
+import { Links, Meta, Outlet, Scripts } from "@remix-run/react";
+
+export default function App() {
+ return (
+
+
+
+
+
+
+
+
+
+
+
+ );
+}
+```
+
+### Browser Extension
+
+Install the extension by following the guide [here](https://github.com/aidenybai/react-scan/blob/main/BROWSER_EXTENSION_GUIDE.md).
+
+## API Reference
+
+
+Options
+
+
+
+```tsx
+export interface Options {
+ /**
+ * Enable/disable scanning
+ * @default true
+ */
+ enabled?: boolean;
+
+ /**
+ * Force React Scan to run in production (not recommended)
+ * @default false
+ */
+ dangerouslyForceRunInProduction?: boolean;
+
+ /**
+ * Log renders to the console
+ * @default false
+ */
+ log?: boolean;
+
+ /**
+ * Show toolbar bar
+ * @default true
+ */
+ showToolbar?: boolean;
+
+ /**
+ * Animation speed
+ * @default "fast"
+ */
+ animationSpeed?: "slow" | "fast" | "off";
+
+ onCommitStart?: () => void;
+ onRender?: (fiber: Fiber, renders: Array) => void;
+ onCommitFinish?: () => void;
+}
+```
+
+
+
+- `scan(options: Options)`: Imperative API to start scanning
+- `useScan(options: Options)`: Hook API to start scanning
+- `setOptions(options: Options): void`: Set options at runtime
+- `getOptions()`: Get the current options
+- `onRender(Component, onRender: (fiber: Fiber, render: Render) => void)`: Hook into a specific component's renders
+
+## Why React Scan?
+
+React can be tricky to optimize.
+
+The issue is that component props are compared by reference, not value. This is intentional -- rendering can be cheap to run.
+
+However, this makes it easy to accidentally cause unnecessary renders, making the app slow. Even production apps with hundreds of engineers can't fully optimize their apps (see [GitHub](https://github.com/aidenybai/react-scan/blob/main/.github/assets/github.mp4), [Twitter](https://github.com/aidenybai/react-scan/blob/main/.github/assets/twitter.mp4), and [Instagram](https://github.com/aidenybai/react-scan/blob/main/.github/assets/instagram.mp4)).
+
+```jsx
+ alert("hi")} style={{ color: "purple" }} />
+```
+
+React Scan helps you identify these issues by automatically detecting and highlighting renders that cause performance issues.
+
+## Resources & Contributing
+
+Want to try it out? Check the [demo](https://react-scan.million.dev).
+
+Looking to contribute? Check the [Contributing Guide](https://github.com/aidenybai/react-scan/blob/main/CONTRIBUTING.md).
+
+Want to talk to the community? Join our [Discord](https://discord.gg/X9yFbcV2rF).
+
+Find a bug? Head to our [issue tracker](https://github.com/aidenybai/react-scan/issues).
+
+[**→ Start contributing on GitHub**](https://github.com/aidenybai/react-scan/blob/main/CONTRIBUTING.md)
+
+## Acknowledgments
+
+- [React Devtools](https://react.dev/learn/react-developer-tools) for the initial idea of highlighting renders
+- [Million Lint](https://million.dev) for scanning and linting approaches
+- [Why Did You Render?](https://github.com/welldone-software/why-did-you-render) for the concept of detecting unnecessary renders
+
+## License
+
+React Scan is [MIT-licensed](LICENSE) open-source software by Aiden Bai, [Million Software, Inc.](https://million.dev), and [contributors](https://github.com/aidenybai/react-scan/graphs/contributors).