@datadayrepos/eslint-config

Custom fork of antfu´s original

Some rule sets might have been changed here. Best to use the original.

From Original

• 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, compose easily!
• Using ESLint Stylistic
• Style principle: Minimal for reading, stable for diff, consistent

Usage

Install

pnpm i -D eslint @datadayrepos/eslint-config

Create config file

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

// eslint.config.js
import datadayrepos from '@datadayrepos/eslint-config'

export default datadayrepos()

With CJS:

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

module.exports = datadayrepos()

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"
  }
}

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": "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. It provides much better organization and composition.

Normally you only need to import the datadayrepos preset:

// eslint.config.js
import datadayrepos from '@datadayrepos/eslint-config'

export default datadayrepos()

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

// eslint.config.js
import datadayrepos from '@datadayrepos/eslint-config'

export default datadayrepos({
  // 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 datadayrepos factory function also accepts any number of arbitrary custom config overrides:

// eslint.config.js
import datadayrepos from '@datadayrepos/eslint-config'

export default datadayrepos(
  {
    // Configures for datadayrepos'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:

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

export default [
  ...ignores(),
  ...javascript(),
  ...comments(),
  ...node(),
  ...jsdoc(),
  ...imports(),
  ...unicorn(),
  ...typescript(),
  ...stylistic(),
  ...vue(),
  ...jsonc(),
  ...yaml(),
  ...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 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 | | 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 datadayrepos from '@datadayrepos/eslint-config'

export default datadayrepos(
  { 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:

// eslint.config.js
import datadayrepos from '@datadayrepos/eslint-config'

export default datadayrepos({
  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 by passing the options object to the typescript config:

// eslint.config.js
import datadayrepos from '@datadayrepos/eslint-config'

export default datadayrepos({
  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:

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

and then

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

FAQ

How to lint CSS?

This config does NOT lint CSS. I personally use UnoCSS so I don't write CSS. If you still prefer CSS, you can use stylelint for CSS linting.

License

MIT License © 2023 DataDayRepos

MIT License © 2019-PRESENT Anthony Fu