0.8.0 • Public • Published


eslint-plugin-css is an ESLint plugin that provides rules to verify CSS definition objects.

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📛 Features

This ESLint plugin provides linting rules to verify CSS definition objects.

  • Find the wrong usage of CSS definition objects, and their hints.
  • Support for Vue and JSX (React).
  • Partial support for styled-components style objects.

You can check on the Online DEMO.


Why is it ESLint plugin?

Stylelint partially supports CSS in JS, but some issues haven't been resolved for a long time.
Also, CSS definitions using template literals are similar to CSS syntax, but CSS definitions using JavaScript objects are not. ESLint may work better for linting JavaScript objects.

📖 Documentation

See documents.

💿 Installation

npm install --save-dev eslint eslint-plugin-css


  • ESLint v7.0.0 and above
  • Node.js v12.22.x, v14.17.x, v16.x and above

📖 Usage

Add css to the plugins section of your .eslintrc configuration file (you can omit the eslint-plugin- prefix) and either use one of the two configurations available (recommended or all) or configure the rules you want:

The recommended configuration

The plugin:css/recommended config enables a subset of the rules that should be most useful to most users. See lib/configs/recommended.ts for more details.

// .eslintrc.js
module.exports = {
    "plugins": [
    "extends": [
         // add more generic rulesets here, such as:
         // 'eslint:recommended',

The standard configuration

The plugin:css/standard config enables a subset of the rules and superset of plugin:css/recommended config that apply a subjective style. See lib/configs/standard.ts for more details.

// .eslintrc.js
module.exports = {
    "plugins": [
    "extends": [

Advanced Configuration

Override/add specific rules configurations. See also:

// .eslintrc.js
module.exports = {
    "plugins": [
    "rules": {
        // Override/add rules settings here, such as:
        "css/rule-name": "error"

Using "plugin:css/all"

The plugin:css/all config enables all rules. It's meant for testing, not for production use because it changes with every minor and major version of the plugin. Use it at your own risk. See lib/configs/all.ts for more details.

How does ESLint detect CSS objects?

All CSS-related rules are applied to code that passes any of the following checks:

  • style={ {} } JSX attribute expression

    const jsx = <div
        style={ {/* JSX attribute expression */} }
  • v-bind:style="{}" Vue directive

            v-bind:style="{/* Vue directive */}"
  • CSS definition function call for styled-components


    import styled, { css, createGlobalStyle } from 'styled-components'
  • According to settings.

However, if you want to take advantage of the rules in any of your custom objects that are CSS objects, you might need to use the special comment // @css that marks an object in the next line as a CSS object in any file, e.g.:

// @css
const myStyle = {
  height: '100px'


The --fix option on the command line automatically fixes problems reported by rules which have a wrench 🔧 below.
The rules with the following star are included in the plugin:css/recommended config and the plugin:css/standard config.
The rules with the following lipstick 💄 are included in the plugin:css/standard config.

Possible Errors

Rule ID Description
css/no-dupe-properties disallow duplicate properties
css/no-invalid-color-hex disallow invalid hex colors
css/no-shorthand-property-overrides disallow shorthand properties that override related longhand properties
css/no-unknown-property disallow unknown properties
css/no-unknown-unit disallow unknown units

Best Practices

Rule ID Description
css/named-color enforce named colors 🔧
css/no-length-zero-unit disallow units for zero lengths 💄🔧
css/no-useless-color-alpha disallow unnecessary alpha-channel transparency value 🔧
css/prefer-reduce-shorthand-property-box-values require reduction in box values of shorthand property 💄🔧

Stylistic Issues

Rule ID Description
css/color-hex-style enforce hex color style 💄🔧
css/no-number-trailing-zeros disallow trailing zeros in numbers. 💄🔧
css/number-leading-zero require or disallow a leading zero for fractional numbers less than 1 💄🔧
css/property-casing enforce specific casing for CSS properties 💄🔧

⚙️ Settings

See Settings.

🍻 Contributing

Welcome contributing!

Please use GitHub's Issues/PRs.


Development Tools

  • npm test runs tests and measures coverage.
  • npm run update runs in order to update readme and configurations.
  • npm run new [new rule name] runs to create the files needed for the new rule.
  • npm run docs:watch starts the website locally.

🔒 License

See the LICENSE file for license rights and limitations (MIT).


npm i eslint-plugin-css

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  • ota-meshi