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May 29, 2024
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Add more codemods #6921

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21 changes: 20 additions & 1 deletion src/content/blog/2024/04/25/react-19-upgrade-guide.md
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Expand Up @@ -405,7 +405,7 @@ root.render(<App />);

<Note>

Codemod `ReactDOM.render` to `ReactDOM.createRoot`:
Codemod `ReactDOM.render` to `ReactDOMClient.createRoot`:

```bash
npx codemod@latest react/19/replace-reactdom-render
Expand All @@ -427,6 +427,15 @@ import {hydrateRoot} from 'react-dom/client';
hydrateRoot(document.getElementById('root'), <App />);
```

<Note>

Codemod `ReactDOM.hydrate` to `ReactDOMClient.hydrateRoot`:

```bash
npx codemod@latest react/19/replace-reactdom-render
```

</Note>

#### Removed: `unmountComponentAtNode` {/*removed-unmountcomponentatnode*/}

Expand All @@ -443,8 +452,18 @@ root.unmount();

For more see `root.unmount()` for [`createRoot`](https://react.dev/reference/react-dom/client/createRoot#root-unmount) and [`hydrateRoot`](https://react.dev/reference/react-dom/client/hydrateRoot#root-unmount).

<Note>

Codemod `unmountComponentAtNode` to `root.unmount`:

```bash
npx codemod@latest react/19/replace-reactdom-render
```

</Note>

#### Removed: `ReactDOM.findDOMNode` {/*removed-reactdom-finddomnode*/}

`ReactDOM.findDOMNode` was [deprecated in October 2018 (v16.6.0)](https://legacy.reactjs.org/blog/2018/10/23/react-v-16-6.html#deprecations-in-strictmode).

We're removing `findDOMNode` because it was a legacy escape hatch that was slow to execute, fragile to refactoring, only returned the first child, and broke abstraction levels (see more [here](https://legacy.reactjs.org/docs/strict-mode.html#warning-about-deprecated-finddomnode-usage)). You can replace `ReactDOM.findDOMNode` with [DOM refs](/learn/manipulating-the-dom-with-refs):
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