npm package: @simon_he/eslint-config
Description: Anthony's ESLint config
Author: Simon He
Latest version: 0.0.6

# @simon_he/eslint-config
Based on [antfu's eslint-config](https://github.com/antfu/eslint-config) modification, it supports the merging of .eslintignore for personal use.

[![npm](https://img.shields.io/npm/v/@simon_he/eslint-config?color=444&label=)](https://npmjs.com/package/@simon_he/eslint-config) 

- Single quotes, no semi
- Auto fix for formatting (aimed to be used standalone **without** Prettier)
- Designed to work with TypeScript, Vue out-of-box
- Lints also for json, yaml, markdown
- Sorted imports, dangling commas
- Reasonable defaults, best practices, only one-line of config
- Respects `.gitignore` by default
- [ESLint Flat config](https://eslint.org/docs/latest/use/configure/configuration-files-new), compose easily!
- Using [ESLint Stylistic](https://github.com/eslint-stylistic/eslint-stylistic)
- **Style principle**: Minimal for reading, stable for diff, consistent

> [!IMPORTANT]
> The main branch is for v1.0-beta, which rewrites to the new [ESLint Flat config](https://eslint.org/docs/latest/use/configure/configuration-files-new), check [#250](https://github.com/antfu/eslint-config/pull/250) for more details.

## Usage

### Install

```bash
pnpm i -D eslint @antfu/eslint-config
```

### Create config file

With [`"type": "module"`](https://nodejs.org/api/packages.html#type) in `package.json` (recommended):

```js
// eslint.config.js
import antfu from '@antfu/eslint-config'

export default antfu()
```

With CJS:

```js
// eslint.config.js
const antfu = require('@antfu/eslint-config').default

module.exports = antfu()
```

> Note that `.eslintignore` no longer works in Flat config, see [customization](#customization) for more details.

### Add script for package.json

For example:

```json
{
  "scripts": {
    "lint": "eslint .",
    "lint:fix": "eslint . --fix"
  }
}
```

## VS Code support (auto fix)

Install [VS Code ESLint extension](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint)

Add the following settings to your `.vscode/settings.json`:

```jsonc
{
  // Enable the ESlint flat config support
  "eslint.experimental.useFlatConfig": true,

  // Disable the default formatter, use eslint instead
  "prettier.enable": false,
  "editor.formatOnSave": false,

  // Auto fix
  "editor.codeActionsOnSave": {
    "source.fixAll": "explicit",
    "source.organizeImports": "never"
  },

  // Silent the stylistic rules in you IDE, but still auto fix them
  "eslint.rules.customizations": [
    { "rule": "style/*", "severity": "off" },
    { "rule": "*-indent", "severity": "off" },
    { "rule": "*-spacing", "severity": "off" },
    { "rule": "*-spaces", "severity": "off" },
    { "rule": "*-order", "severity": "off" },
    { "rule": "*-dangle", "severity": "off" },
    { "rule": "*-newline", "severity": "off" },
    { "rule": "*quotes", "severity": "off" },
    { "rule": "*semi", "severity": "off" }
  ],

  // Enable eslint for all supported languages
  "eslint.validate": [
    "javascript",
    "javascriptreact",
    "typescript",
    "typescriptreact",
    "vue",
    "html",
    "markdown",
    "json",
    "jsonc",
    "yaml"
  ]
}
```

## Customization

Since v1.0, we migrated to [ESLint Flat config](https://eslint.org/docs/latest/use/configure/configuration-files-new). It provides much better organization and composition.

Normally you only need to import the `antfu` preset:

```js
// eslint.config.js
import antfu from '@antfu/eslint-config'

export default antfu()
```

And that's it! Or you can configure each integration individually, for example:

```js
// eslint.config.js
import antfu from '@antfu/eslint-config'

export default antfu({
  // Enable stylistic formatting rules
  // stylistic: true,

  // Or customize the stylistic rules
  stylistic: {
    indent: 2, // 4, or 'tab'
    quotes: 'single', // or 'double'
  },

  // TypeScript and Vue are auto-detected, you can also explicitly enable them:
  typescript: true,
  vue: true,

  // Disable jsonc and yaml support
  jsonc: false,
  yaml: false,

  // `.eslintignore` is no longer supported in Flat config, use `ignores` instead
  ignores: [
    './fixtures',
    // ...globs
  ]
})
```

The `antfu` factory function also accepts any number of arbitrary custom config overrides:

```js
// eslint.config.js
import antfu from '@antfu/eslint-config'

export default antfu(
  {
    // Configures for antfu's config
  },

  // From the second arguments they are ESLint Flat Configs
  // you can have multiple configs
  {
    files: ['**/*.ts'],
    rules: {},
  },
  {
    rules: {},
  },
)
```

Going more advanced, you can also import fine-grained configs and compose them as you wish:

```js
// eslint.config.js
import {
  comments,
  ignores,
  imports,
  javascript,
  jsdoc,
  jsonc,
  markdown,
  node,
  sortPackageJson,
  sortTsconfig,
  stylistic,
  typescript,
  unicorn,
  vue,
  yaml,
} from '@antfu/eslint-config'

export default [
  ...ignores(),
  ...javascript(),
  ...comments(),
  ...node(),
  ...jsdoc(),
  ...imports(),
  ...unicorn(),
  ...typescript(),
  ...stylistic(),
  ...vue(),
  ...jsonc(),
  ...yaml(),
  ...markdown(),
]
```

Check out the [configs](https://github.com/antfu/eslint-config/blob/main/src/configs) and [factory](https://github.com/antfu/eslint-config/blob/main/src/factory.ts) for more details.

> Thanks to [sxzz/eslint-config](https://github.com/sxzz/eslint-config) for the inspiration and reference.

### Plugins Renaming

Since flat config requires us to explicitly provide the plugin names (instead of mandatory convention from npm package name), we renamed some plugins to make overall scope more consistent and easier to write.

| New Prefix | Original Prefix | Source Plugin |
| --- | --- | --- |
| `import/*` | `i/*` | [eslint-plugin-i](https://github.com/un-es/eslint-plugin-i) |
| `node/*` | `n/*` | [eslint-plugin-n](https://github.com/eslint-community/eslint-plugin-n) |
| `yaml/*` | `yml/*` | [eslint-plugin-yml](https://github.com/ota-meshi/eslint-plugin-yml) |
| `ts/*` | `@typescript-eslint/*` | [@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint) |
| `style/*` | `@stylistic/*` | [@stylistic/eslint-plugin](https://github.com/eslint-stylistic/eslint-stylistic) |
| `test/*` | `vitest/*` | [eslint-plugin-vitest](https://github.com/veritem/eslint-plugin-vitest) |
| `test/*` | `no-only-tests/*` | [eslint-plugin-no-only-tests](https://github.com/levibuzolic/eslint-plugin-no-only-tests) |

When you want to override rules, or disable them inline, you need to update to the new prefix:

```diff
-// eslint-disable-next-line @typescript-eslint/consistent-type-definitions
+// eslint-disable-next-line ts/consistent-type-definitions
type foo = { bar: 2 }
```

### Optional Rules

This config also provides some optional plugins/rules for extended usages.

#### `sort-keys`

This plugin [`eslint-plugin-sort-keys`](https://github.com/namnm/eslint-plugin-sort-keys) allows you to keep object keys sorted with auto-fix.

It's installed but no rules are enabled by default. 

It's recommended to opt-in on each file individually using [configuration comments](https://eslint.org/docs/latest/use/configure/rules#using-configuration-comments-1).

```js
/* eslint sort-keys/sort-keys-fix: "error" */
const objectWantedToSort = {
  a: 2,
  b: 1,
  c: 3,
}
/* eslint sort-keys/sort-keys-fix: "off" */
```


### Rules Overrides

Certain rules would only be enabled in specific files, for example, `ts/*` rules would only be enabled in `.ts` files and `vue/*` rules would only be enabled in `.vue` files. If you want to override the rules, you need to specify the file extension:

```js
// eslint.config.js
import antfu from '@antfu/eslint-config'

export default antfu(
  { vue: true, typescript: true },
  {
    // Remember to specify the file glob here, otherwise it might cause the vue plugin to handle non-vue files
    files: ['**/*.vue'],
    rules: {
      'vue/operator-linebreak': ['error', 'before'],
    },
  },
  {
    // Without `files`, they are general rules for all files
    rules: {
      'style/semi': ['error', 'never'],
    },
  }
)
```

We also provided an `overrides` options to make it easier:

```js
// eslint.config.js
import antfu from '@antfu/eslint-config'

export default antfu({
  overrides: {
    vue: {
      'vue/operator-linebreak': ['error', 'before'],
    },
    typescript: {
      'ts/consistent-type-definitions': ['error', 'interface'],
    },
    yaml: {},
    // ...
  }
})
```

### Type Aware Rules

You can optionally enable the [type aware rules](https://typescript-eslint.io/linting/typed-linting/) by passing the options object to the `typescript` config:

```js
// eslint.config.js
import antfu from '@antfu/eslint-config'

export default antfu({
  typescript: {
    tsconfigPath: 'tsconfig.json',
  },
})
```

### Lint Staged

If you want to apply lint and auto-fix before every commit, you can add the following to your `package.json`:

```json
{
  "simple-git-hooks": {
    "pre-commit": "pnpm lint-staged"
  },
  "lint-staged": {
    "*": "eslint --fix"
  }
}
```

and then

```bash
npm i -D lint-staged simple-git-hooks
```

## Badge

If you enjoy this code style, and would like to mention it in your project, here is the badge you can use:

```md
[![code style](https://antfu.me/badge-code-style.svg)](https://github.com/antfu/eslint-config)
```

[![code style](https://antfu.me/badge-code-style.svg)](https://github.com/antfu/eslint-config)

## FAQ

### Prettier?

[Why I don't use Prettier](https://antfu.me/posts/why-not-prettier)

### How to lint CSS?

This config does NOT lint CSS. I personally use [UnoCSS](https://github.com/unocss/unocss) so I don't write CSS. If you still prefer CSS, you can use [stylelint](https://stylelint.io/) for CSS linting.

### I prefer XXX...

Sure, you can config and override rules locally in your project to fit your needs. If that still does not work for you, you can always fork this repo and maintain your own.

## Check Also

- [antfu/dotfiles](https://github.com/antfu/dotfiles) - My dotfiles
- [antfu/vscode-settings](https://github.com/antfu/vscode-settings) - My VS Code settings
- [antfu/ts-starter](https://github.com/antfu/ts-starter) - My starter template for TypeScript library
- [antfu/vitesse](https://github.com/antfu/vitesse) - My starter template for Vue & Vite app

## License

[MIT](./LICENSE) License &copy; 2019-PRESENT [Anthony Fu](https://github.com/antfu)