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docs: update the code style page (#26792)

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docs/2.guide/1.concepts/9.code-style.md
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@ -5,76 +5,20 @@ description: "Nuxt supports ESLint out of the box"
## ESLint
The recommended approach for Nuxt is to enable ESLint support using [`@nuxt/eslint-config`](https://github.com/nuxt/eslint-config).
The recommended approach for Nuxt is to enable ESLint support using the [`@nuxt/eslint`](https://eslint.nuxt.com/packages/module) module, that will setup project-aware ESLint configuration for you.
At the moment, this configuration will not format your files; you can set up Prettier or another tool to do so.
:::callout{icon="i-ph-lightbulb-duotone"}
The module is designed for the [new ESLint flat config format](https://eslint.org/docs/latest/use/configure/configuration-files-new) with is the [default format since ESLint v9](https://eslint.org/blog/2024/04/eslint-v9.0.0-released/).
::alert{type=info}
We're currently working to refactor the Nuxt ESLint configuration. Subscribe to the [Nuxt ESLint roadmap](https://github.com/nuxt/eslint-config/issues/303) to follow updates.
::
If you are using the legacy `.eslintrc` config, you will need to [configure manually with `@nuxt/eslint-config`](https://eslint.nuxt.com/packages/config#legacy-config-format). We highly recommand you to migrate over the flat config to be future-proof.
:::
### Install Dependencies
## Quick Setup
Install both ESLint and the Nuxt configuration as development dependencies.
::code-group
```bash [yarn]
yarn add --dev eslint @nuxt/eslint-config
```bash
npx nuxi module add eslint
```
```bash [npm]
npm install --save-dev eslint @nuxt/eslint-config
```
Start your Nuxt app, a `eslint.config.mjs` file will be generated under your project root. You can customize it as needed.
```bash [pnpm]
pnpm add -D eslint @nuxt/eslint-config
```
```bash [bun]
bun add -D eslint @nuxt/eslint-config
```
::
### Configuration
Add `.eslintrc.cjs` to the root folder of your Nuxt app.
```js
module.exports = {
root: true,
extends: ['@nuxt/eslint-config'],
}
```
### Modify package.json
Add the below to lint commands to your `package.json` script section:
```json
"scripts": {
...
"lint": "eslint .",
"lint:fix": "eslint . --fix",
...
},
```
Run the `lint` command to check if the code style is correct or run `lint:fix` to automatically fix issues.
### Configuring VS Code
Install the [VS Code ESLint extension](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint).
In VS Code press `ctrl+shift+p` (`cmd+shift+p` on Mac) to open the command prompt, find `Open Workspace Settings (JSON)`, add the below lines to the JSON and save:
```json
{
"editor.codeActionsOnSave": {
"source.fixAll.eslint": "explicit"
}
}
```
You're good to go! On save, your files will be linted and auto-fixed.
You can learn more about the module and customizations in [Nuxt ESLint's documentation](https://eslint.nuxt.com/packages/module).