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stylelint

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A mighty, modern CSS linter.

stylelint.io

stylelint/stylelint

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# Vision A linter for CSS and CSS-like languages that is: - complete - coverage of all standard CSS syntax - extensible - multiple points of extension - configurable - no defaults and options to tailor the linter - robust - comprehensive test coverage and a wide range of fixtures - consistent - conventions for behavior, naming and documentation - performant - tools to test and improve performance ## Complete Provide built-in rules for standard CSS syntax that: - [detect possible errors](../user-guide/rules/list.md#possible-errors) - [limit language features](../user-guide/rules/list.md#limit-language-features) - [enforce stylistic conventions](../user-guide/rules/list.md#stylistic-issues) ### Possible errors Provide rules to catch code that is valid but likely has unintended consequences, e.g. duplicates and overrides. ### Limit language features Provide rules to limit what language features can be used to enforce: - a maximum specificity by limiting the overall specificity or the occurrence of different selector types, e.g. class, ID and attribute - best practice _at the configuration level_, e.g. disallowing the `all` keyword for transitions - the use of a subset of features to improve consistency across a codebase, e.g. limiting what units are allowed - specific patterns for selectors and names, e.g. those of custom properties ### Stylistic issues Provide rules to enforce a diverse range of stylistic conventions, including: - whitespace - case - quotes ## Extensible Provide multiple points of extensions, including: - [plugins](../developer-guide/plugins.md) - build community rules to support methodologies, toolsets, non-standard CSS features, or very specific use cases - [extendable configs](../user-guide/configure.md#extends) - extend and share configurations - [formatters](../developer-guide/formatters.md) - format stylelint result objects - [custom syntax](syntaxes.md) - use any PostCSS-compatible syntax module ## Robust Provide a robust tool with a [comprehensive test suite](../developer-guide/rules.md#write-tests), including: - high coverage, currently over 95% - a wide range of fixtures for rules ## Consistent Provide consistency throughout, including consistent [rules](../user-guide/rules/about.md). ## Performant Provide a fast tool and the means to test and improve performance, including [benchmarking](../developer-guide/rules.md#improve-the-performance-of-a-rule) of an individual rule's performance.