stylelint

Stylelint

A mighty CSS linter that helps you avoid errors and enforce conventions.

Features

It's mighty as it:

• has over 100 built-in rules for modern CSS syntax and features

• supports plugins so you can create your own custom rules

• automatically fixes problems where possible

• supports shareable configs that you can create or extend

• can be customized to your exact needs

• has 15k unit tests making it robust

• is trusted by companies worldwide like Google and GitHub

And it can be extended to:

• extract embedded styles from HTML, Markdown and CSS-in-JS template literals

• parse CSS-like languages like SCSS, Sass, Less and SugarSS

How it'll help you

It'll help you avoid errors, for example:

• invalid things, e.g. malformed grid areas

• valid things that are problematic, e.g. duplicate selectors

• unknown things, e.g. misspelled property names

And enforce conventions, for example:

• disallow things, e.g. specific units

• enforce naming patterns, e.g. for custom properties

• set limits, e.g. the number of ID selectors

• specify notations, e.g. for modern color functions

We recommend using a pretty printer like Prettier alongside Stylelint. Linters and pretty printers are complementary tools that work together to help you write consistent and error-free code.

Example output

Guides

• User guide

• Getting started

• Customizing

• Configuring

• Rules

• Ignoring code

• CLI

• Node.js API

• PostCSS plugin

• Options

• Errors & warnings

• Developer guide

• Writing rules

• Writing plugins

• Writing custom syntaxes

• Writing custom formatters

• Writing system tests

• Migration guide

• Migrating to 16.0.0

• Migrating to 15.0.0

• Migrating to 14.0.0

• Maintainer guide

• Managing issues

• Managing pull requests

• Performing releases

• About

• Vision

• Semantic versioning