@mastondzn/eslint

v0.10.0

Published

6 months ago

Maston's customizable ESLint config

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mastondzn

eslint-config

@mastondzn/eslint

[!IMPORTANT] The below readme is not updated for the customizations made by me, but most of its content is still relevant.

Single quotes, no semi
Auto fix for formatting (aimed to be used standalone without Prettier)
Sorted imports, dangling commas
Reasonable defaults, best practices, only one line of config
Designed to work with TypeScript, JSX, Vue out-of-box
Lints also for json, yaml, toml, markdown
Opinionated, but very customizable
ESLint Flat config, compose easily!
Using ESLint Stylistic
Respects .gitignore by default
Optional React, Svelte, UnoCSS, Astro support
Optional formatters support for CSS, HTML, etc.
Style principle: Minimal for reading, stable for diff, consistent

[!IMPORTANT] Since v1.0.0, this config is rewritten to the new ESLint Flat config, check the release note for more details.

Usage

Install

pnpm i -D eslint @antfu/eslint-config

Create config file

With "type": "module" in package.json (recommended):

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

export default antfu();

With CJS:

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

module.exports = antfu();

[!TIP] ESLint only detects eslint.config.js as the flat config entry, meaning you need to put type: module in your package.json or you have to use CJS in eslint.config.js. If you want explicit extension like .mjs or .cjs, or even eslint.config.ts, you can install eslint-ts-patch to fix it.

Combined with legacy config:

// eslint.config.js
const antfu = require('@antfu/eslint-config').default;
const { FlatCompat } = require('@eslint/eslintrc');

const compat = new FlatCompat();

module.exports = antfu(
  {
    ignores: [],
  },

  // Legacy config
  ...compat.config({
    extends: [
      'eslint:recommended',
      // Other extends...
    ],
  })

  // Other flat configs...
);

Note that .eslintignore no longer works in Flat config, see customization for more details.

Add script for package.json

For example:

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

Migration

We provided an experimental CLI tool to help you migrate from the legacy config to the new flat config.

npx @antfu/eslint-config@latest

Before running the migration, make sure to commit your unsaved changes first.

VS Code support (auto fix)

Install VS Code ESLint extension

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

{
  // 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.eslint": "explicit",
    "source.organizeImports": "never"
  },

  // Silent the stylistic rules in you IDE, but still auto fix them
  "eslint.rules.customizations": [
    { "rule": "style/*", "severity": "off" },
    { "rule": "format/*", "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",
    "toml"
  ]
}

Customization

Since v1.0, we migrated to ESLint Flat config. It provides much better organization and composition.

Normally you only need to import the antfu preset:

// 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:

// 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:

// 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:

We wouldn't recommend using this style in general unless you know exactly what they are doing, as there are shared options between configs and might need extra care to make them consistent.

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

export default combine(
  ignores(),
  javascript(/* Options */),
  comments(),
  node(),
  jsdoc(),
  imports(),
  unicorn(),
  typescript(/* Options */),
  stylistic(),
  vue(),
  jsonc(),
  yaml(),
  toml(),
  markdown(),
);

Check out the configs and factory for more details.

Thanks to sxzz/eslint-config for the inspiration and reference.

Plugins Renaming

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

| New Prefix | Original Prefix | Source Plugin | | ---------- | ---------------------- | ------------------------------------------------------------------------------------------ | | import/* | i/* | eslint-plugin-i | | node/* | n/* | eslint-plugin-n | | yaml/* | yml/* | eslint-plugin-yml | | ts/* | @typescript-eslint/* | @typescript-eslint/eslint-plugin | | style/* | @stylistic/* | @stylistic/eslint-plugin | | test/* | vitest/* | eslint-plugin-vitest | | test/* | no-only-tests/* | eslint-plugin-no-only-tests |

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

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

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:

// 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 a overrides options in each integration to make it easier:

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

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

Optional Configs

We provide some optional configs for specific use cases, that we don't include their dependencies by default.

Formatters

[!WARNING] Experimental feature, changes might not follow semver.

Use external formatters to format files that ESLint cannot handle yet (.css, .html, etc). Powered by eslint-plugin-format.

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

export default antfu({
  formatters: {
    /**
     * Format CSS, LESS, SCSS files, also the `<style>` blocks in Vue
     * By default uses Prettier
     */
    css: true,
    /**
     * Format HTML files
     * By default uses Prettier
     */
    html: true,
    /**
     * Format Markdown files
     * Supports Prettier and dprint
     * By default uses Prettier
     */
    markdown: 'prettier'
  }
});