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Configuration

stylelint expects a configuration object.

stylelint uses cosmiconfig to find and load your configuration object. Starting from the current working directory, it looks for the following possible sources:

  • a stylelint property in package.json
  • a .stylelintrc file
  • a stylelint.config.js file exporting a JS object

The search stops when one of these is found, and stylelint uses that object. You can use the --config or configFile option to short-circuit the search.

The .stylelintrc file (without extension) can be in JSON or YAML format. You can add a filename extension to help your text editor provide syntax checking and highlighting:

  • .stylelintrc.json
  • .stylelintrc.yaml / .stylelintrc.yml
  • .stylelintrc.js

The configuration object has the following properties:

rules

Rules determine what the linter looks for and complains about. There are over 170 rules built into stylelint.

No rules are turned on by default and there are no default values. You must explicitly configure each rule to turn it on.

The rules property is an object whose keys are rule names and values are rule configurations. For example:

{
  "rules": {
    "color-no-invalid-hex": true
  }
}

Each rule configuration fits one of the following formats:

  • null (to turn the rule off)
  • a single value (the primary option)
  • an array with two values ([primary option, secondary options])

Specifying a primary option turns on a rule.

Many rules provide secondary options for further customization. To set secondary options, use a two-member array. For example:

{
  "rules": {
    "selector-pseudo-class-no-unknown": [
      true,
      {
        "ignorePseudoClasses": ["global"]
      }
    ]
  }
}

You can add any number of keys in the object. For example, you can:

  • turn off block-no-empty
  • turn on comment-empty-line-before with a primary and secondary option
  • turn on max-empty-lines and unit-allowed-list with primary options
{
  "rules": {
    "block-no-empty": null,
    "comment-empty-line-before": [
      "always",
      {
        "ignore": ["stylelint-commands", "after-comment"]
      }
    ],
    "max-empty-lines": 2,
    "unit-allowed-list": ["em", "rem", "%", "s"]
  }
}

message

You can use the message secondary option to deliver a custom message when a rule is violated.

For example, the following rule configuration would substitute in custom messages:

{
  "rules": {
    "color-hex-case": [
      "lower",
      {
        "message": "Lowercase letters are easier to distinguish from numbers"
      }
    ],
    "indentation": [
      2,
      {
        "except": ["block"],
        "message": "Please use 2 spaces for indentation.",
        "severity": "warning"
      }
    ]
  }
}

Alternately, you can write a custom formatter for maximum control if you need serious customization.

severity

You can use the severity secondary option to adjust any specific rule's severity.

The available values for severity are:

  • "warning"
  • "error" (default)

For example:

{
  "rules": {
    "indentation": [
      2,
      {
        "except": ["value"],
        "severity": "warning"
      }
    ]
  }
}

Reporters may use these severity levels to display violations or exit the process differently.

reportDisables

You can set the reportDisables secondary option to report any disable comments for this rule, effectively disallowing authors to opt out of it.

For example:

{
  "rules": {
    "indentation": [
      2,
      {
        "except": ["value"],
        "reportDisables": true
      }
    ]
  }
}

defaultSeverity

You can set the default severity level for all rules that do not have a severity specified in their secondary options. For example, you can set the default severity to "warning":

{
  "defaultSeverity": "warning"
}

extends

You can extend an existing configuration (whether your own or a third-party one).

Popular configurations include:

You'll find more in awesome stylelint.

When one configuration extends another, it starts with the other's properties then adds to and overrides what's there.

For example, you can extend the stylelint-config-standard and then change the indentation to tabs and turn off the number-leading-zero rule:

{
  "extends": "stylelint-config-standard",
  "rules": {
    "indentation": "tab",
    "number-leading-zero": null
  }
}

You can extend an array of existing configurations, with each item in the array taking precedence over the previous item (so the second item overrides rules in the first, the third item overrides rules in the first and the second, and so on, the last item overrides everything else).

For example, with stylelint-config-standard, then layer myExtendableConfig on top of that, and then override the indentation rule:

{
  "extends": ["stylelint-config-standard", "./myExtendableConfig"],
  "rules": {
    "indentation": "tab"
  }
}

The value of "extends" is a "locater" (or an array of "locaters") that is ultimately require()d. It can fit whatever format works with Node's require.resolve() algorithm. That means a "locater" can be:

  • the name of a module in node_modules (e.g. stylelint-config-standard; that module's main file must be a valid JSON configuration)
  • an absolute path to a file (which makes sense if you're creating a JS object in a Node.js context and passing it in) with a .js or .json extension.
  • a relative path to a file with a .js or .json extension, relative to the referencing configuration (e.g. if configA has extends: "../configB", we'll look for configB relative to configA).

plugins

Plugins are rules or sets of rules built by the community that support methodologies, toolsets, non-standard CSS features, or very specific use cases.

Popular plugin packs include:

  • stylelint-order - specify the ordering of things, e.g. properties within declaration blocks
  • stylelint-scss - enforce a wide variety of linting rules for SCSS-like syntax

You'll find more in awesome stylelint.

To use one, add a "plugins" array to your config, containing "locaters" identifying the plugins you want to use. As with extends, above, a "locater" can be either a:

  • npm module name
  • absolute path
  • path relative to the invoking configuration file

Once the plugin is declared, within your "rules" object you'll need to add options for the plugin's rule(s), just like any standard rule. Look at the plugin's documentation to know what the rule name should be.

{
  "plugins": ["../special-rule.js"],
  "rules": {
    "plugin-namespace/special-rule": "everything"
  }
}

A "plugin" can provide a single rule or a set of rules. If the plugin you use provides a set, invoke the module in your "plugins" configuration value, and use the rules it provides in "rules". For example:

{
  "plugins": ["../some-rule-set.js"],
  "rules": {
    "some-rule-set/first-rule": "everything",
    "some-rule-set/second-rule": "nothing",
    "some-rule-set/third-rule": "everything"
  }
}

processors

Processors are functions built by the community that hook into stylelint's pipeline, modifying code on its way into stylelint and modifying results on their way out.

We discourage their use in favor of using the built-in syntaxes as processors are incompatible with the autofix feature.

To use one, add a "processors" array to your config, containing "locaters" identifying the processors you want to use. As with extends, above, a "locater" can be either an npm module name, an absolute path, or a path relative to the invoking configuration file.

{
  "processors": ["stylelint-my-processor"],
  "rules": {}
}

If your processor has options, make that item an array whose first item is the "locator" and second item is the options object.

{
  "processors": [
    "stylelint-my-processor",
    ["some-other-processor", { "optionOne": true, "optionTwo": false }]
  ],
  "rules": {}
}

Processors can also only be used with the CLI and the Node.js API, not with the PostCSS plugin. (The PostCSS plugin ignores them.)

ignoreFiles

You can provide a glob or array of globs to ignore specific files.

For example, you can ignore all JavaScript files:

{
  "ignoreFiles": ["**/*.js"]
}

stylelint ignores the node_modules directory by default. However, this is overridden if ignoreFiles is set.

If the globs are absolute paths, they are used as is. If they are relative, they are analyzed relative to

  • configBasedir, if it's provided;
  • the config's filepath, if the config is a file that stylelint found a loaded;
  • or process.cwd().

The ignoreFiles property is stripped from extended configs: only the root-level config can ignore files.

Note that this is not an efficient method for ignoring lots of files. If you want to ignore a lot of files efficiently, use .stylelintignore or adjust your files globs.