stylelint-scss

What is stylelint-scss?

The stylelint-scss npm package is a plugin for stylelint that provides linting rules specific to SCSS syntax. It helps enforce consistent conventions and avoid errors in your SCSS files.

What are stylelint-scss's main functionalities?

Linting SCSS-specific syntax

This feature allows you to lint SCSS-specific syntax such as @rules, $variables, and nesting. The code sample shows how to enable rules in a stylelint configuration file to disallow unknown @rules, enforce a naming pattern for $variables, and prevent redundant nesting selectors.

"rules": {
  "scss/at-rule-no-unknown": true,
  "scss/dollar-variable-pattern": "^foo-",
  "scss/selector-no-redundant-nesting-selector": true
}

Enforcing best practices

This feature helps enforce best practices in SCSS by preventing common mistakes. The code sample demonstrates enabling rules that ensure placeholders are used with @extend, discourage the use of leading underscores in partial names on @import, and prevent duplicate $variable declarations.

"rules": {
  "scss/at-extend-no-missing-placeholder": true,
  "scss/at-import-no-partial-leading-underscore": true,
  "scss/no-duplicate-dollar-variables": true
}

Customizable rules for SCSS

This feature provides customizable rules tailored for SCSS, allowing you to enforce specific stylistic decisions or prevent certain patterns. The code sample shows rules that enforce no spaces around operators, disallow nested properties, and ensure that dimensions only contain numeric values.

"rules": {
  "scss/operator-no-unspaced": true,
  "scss/declaration-nested-properties": "never",
  "scss/dimension-no-non-numeric-values": true
}

Other packages similar to stylelint-scss

sass-lint

sass-lint is a Node-only Sass linter for both sass and scss syntax. It offers similar functionality to stylelint-scss but is not a plugin for stylelint and has its own set of rules and configuration.

postcss-scss

postcss-scss is a SCSS parser for PostCSS, which allows you to lint SCSS within PostCSS's ecosystem. It can be used with stylelint but does not provide SCSS-specific linting rules on its own.

scss-lint

scss-lint is a Ruby gem that provides linting for SCSS files. It is similar to stylelint-scss in that it focuses on SCSS syntax but requires Ruby and is not integrated with the stylelint ecosystem.

README

stylelint-scss

A collection of SCSS specific linting rules for stylelint (in a form of a plugin).

Purpose

stylelint by itself supports SCSS syntax very well (as well as other preprocessors' syntaxes). Moreover, it introduces some specific rules that can be used to lint SCSS, e.g. to limit nesting, control the way @-rules are written. Yet stylelint is in general focused on standard CSS.

stylelint-scss introduces rules specific to SCSS syntax. That said, the rules from this plugin can be used with other syntaxes, like Less or some PostCSS syntaxes. That's why the rules' names are not tied to SCSS only (at-function-pattern instead of scss-function-pattern).

The plugin follows stylelint's guidelines (about rule names, testing and so on).

Installation and usage

stylelint-scss is a plugin for stylelint, so it's meant to be used with it.

First, install stylelint-scss (and stylelint, if you haven't done so yet) via NPM:

npm install stylelint stylelint-scss

Create the .stylelintrc.json config file (or open the existing one), add stylelint-scss to the plugins array and the rules you need to the rules list. All rules from stylelint-scss need to be namespaced with scss.

{
  "plugins": [
    "stylelint-scss"
  ],
  "rules": {
    // recommended rules
    "at-rule-no-unknown": null,
    "scss/at-rule-no-unknown": true,
    ...
    ...
    // any other rules you'd want to change e.g.
    "scss/dollar-variable-pattern": "^foo",
    "scss/selector-no-redundant-nesting-selector": true,
  }
}

Please refer to stylelint docs for the detailed info on using this linter.

List of rules

Here are stylelint-scss' rules, grouped by the thing they apply to (just like in stylelint).

Please also see the example configs for special cases.

@-each

• at-each-key-value-single-line: This is a rule that checks for situations where users have done a loop using map-keys and grabbed the value for that key inside of the loop.

@-else

• at-else-closing-brace-newline-after: Require or disallow a newline after the closing brace of @else statements (Autofixable).
• at-else-closing-brace-space-after: Require a single space or disallow whitespace after the closing brace of @else statements (Autofixable).
• at-else-empty-line-before: Require an empty line or disallow empty lines before @-else (Autofixable).
• at-else-if-parentheses-space-before: Require or disallow a space before @else if parentheses (Autofixable).

@-extend

• at-extend-no-missing-placeholder: Disallow at-extends (@extend) with missing placeholders.

@-function

• at-function-named-arguments: Require named parameters in SCSS function call rule.
• at-function-parentheses-space-before: Require or disallow a space before @function parentheses (Autofixable).
• at-function-pattern: Specify a pattern for Sass/SCSS-like function names.

@-if

• at-if-closing-brace-newline-after: Require or disallow a newline after the closing brace of @if statements (Autofixable).
• at-if-closing-brace-space-after: Require a single space or disallow whitespace after the closing brace of @if statements (Autofixable).
• at-if-no-null: Disallow null in @if statements.

@-import

• at-import-no-partial-leading-underscore: Disallow leading underscore in partial names in @import.
• at-import-partial-extension: Require or disallow extension in @import commands.
• at-import-partial-extension-blacklist: Specify blacklist of disallowed file extensions for partial names in @import commands.
• at-import-partial-extension-whitelist: Specify whitelist of allowed file extensions for partial names in @import commands.

@-mixin

• at-mixin-argumentless-call-parentheses: Require or disallow parentheses in argumentless @mixin calls (Autofixable).
• at-mixin-named-arguments: Require named parameters in at-mixin call rule.
• at-mixin-parentheses-space-before: Require or disallow a space before @mixin parentheses (Autofixable).
• at-mixin-pattern: Specify a pattern for Sass/SCSS-like mixin names.

@-rule

• at-rule-conditional-no-parentheses: Disallow parentheses in conditional @ rules (if, elsif, while) (Autofixable).
• at-rule-no-unknown: Disallow unknown at-rules. Should be used instead of stylelint's at-rule-no-unknown.

$-variable

• dollar-variable-colon-newline-after: Require a newline after the colon in $-variable declarations (Autofixable).
• dollar-variable-colon-space-after: Require or disallow whitespace after the colon in $-variable declarations (Autofixable).
• dollar-variable-colon-space-before: Require a single space or disallow whitespace before the colon in $-variable declarations (Autofixable).
• dollar-variable-default: Require !default flag for $-variable declarations.
• dollar-variable-empty-line-after: Require a single empty line or disallow empty lines after $-variable declarations (Autofixable).
• dollar-variable-empty-line-before: Require a single empty line or disallow empty lines before $-variable declarations (Autofixable).
• dollar-variable-first-in-block: Require for variables to be put first in a block (a rule or in root).
• dollar-variable-no-missing-interpolation: Disallow Sass variables that are used without interpolation with CSS features that use custom identifiers.
• dollar-variable-pattern: Specify a pattern for Sass-like variables.

%-placeholder

• percent-placeholder-pattern: Specify a pattern for %-placeholders.

//-comment

• double-slash-comment-empty-line-before: Require or disallow an empty line before //-comments (Autofixable).
• double-slash-comment-inline: Require or disallow //-comments to be inline comments.
• double-slash-comment-whitespace-inside: Require or disallow whitespace after the // in //-comments

Comment

• comment-no-empty: Disallow empty comments.
• comment-no-loud: Disallow /*-comments.

Declaration

• declaration-nested-properties: Require or disallow properties with - in their names to be in a form of a nested group.
• declaration-nested-properties-no-divided-groups: Disallow nested properties of the same "namespace" be divided into multiple groups.

Dimension

• dimension-no-non-numeric-values: Disallow non-numeric values when interpolating a value with a unit.

Function

• function-color-relative: Encourage the use of the scale-color function over regular color functions.
• function-quote-no-quoted-strings-inside: Disallow quoted strings inside the quote function (Autofixable).
• function-unquote-no-unquoted-strings-inside: Disallow unquoted strings inside the unquote function (Autofixable).

Map

• map-keys-quotes: Require quoted keys in Sass maps.

Media feature

• media-feature-value-dollar-variable: Require a media feature value be a $-variable or disallow $-variables in media feature values.

Operator

• operator-no-newline-after: Disallow linebreaks after Sass operators.
• operator-no-newline-before: Disallow linebreaks before Sass operators.
• operator-no-unspaced: Disallow unspaced operators in Sass operations.

Partial

• partial-no-import: Disallow non-CSS @imports in partial files.

Selector

• selector-nest-combinators: Require or disallow nesting of combinators in selectors.
• selector-no-redundant-nesting-selector: Disallow redundant nesting selectors (&).
• selector-no-union-class-name: Disallow union class names with the parent selector (&).

General / Sheet

• no-dollar-variables: Disallow dollar variables within a stylesheet.
• no-duplicate-dollar-variables: Disallow duplicate dollar variables within a stylesheet.
• no-duplicate-mixins: Disallow duplicate mixins within a stylesheet.
• no-global-function-names: Disallows the use of global function names, as these global functions are now located inside built-in Sass modules.

Help out

There work on the plugin's rules is still in progress, so if you feel like it, you're welcome to help out in any of these (the plugin follows stylelint guidelines so most part of this is based on its docs):

• Create, enhance, and debug rules (see stylelint's guide to "Working on rules").
• Improve documentation.
• Chime in on any open issue or pull request.
• Open new issues about your ideas on new rules, or for how to improve the existing ones, and pull requests to show us how your idea works.
• Add new tests to absolutely anything.
• Work on improving performance of rules.
• Contribute to stylelint
• Spread the word.

We communicate via issues and pull requests.

There is also stackoverflow, which would be the preferred QA forum.

Contributors

Thanks goes to these wonderful people:

kristerkari	dryoma	rambleraptor	XhmikosR	srawlins	pipopotamasu

evilebottnawi	OriR	ntwb	ricardogobbosouza	bjankord	thibaudcolas

AndyOGo	niksy	lxsymington	vseventer	Deimos	diego-codes

EvanHahn	guoyunhe	jantimon	stormwarning	keegan-lillo	manovotny

paulgv	sajadtorkamani	YozhikM	YodaDaCoda	freezy-sk	jeddy3

Important documents

• Changelog
• Contributing
• License