index.js

export default {
  /**
   * @see {@link https://stylelint.io/user-guide/configure#extends}
   * @see {@link https://www.npmjs.com/package/stylelint-config-standard-scss}
   * @see {@link https://www.npmjs.com/package/@stylistic/stylelint-config}
   */
  extends: ["stylelint-config-standard-scss", "@stylistic/stylelint-config"],

  /**
   * @see {@link https://stylelint.io/user-guide/configure#plugins}
   * @see {@link https://www.npmjs.com/package/stylelint-order}
   */
  plugins: ["stylelint-order"],

  rules: {
    /**
     * Require an empty line before at-rules.
     *
     * @see {@link https://stylelint.io/user-guide/rules/at-rule-empty-line-before/}
     */
    "at-rule-empty-line-before": [
      "always",
      {
        except: ["blockless-after-same-name-blockless", "first-nested"],
        ignore: ["after-comment"],
        ignoreAtRules: ["else"],
      },
    ],

    /**
     * Specify the alphabetical order of properties within declaration blocks.
     *
     * @see {@link https://github.com/hudochenkov/stylelint-order/blob/master/rules/properties-alphabetical-order/README.md}
     */
    "order/properties-alphabetical-order": true,

    /**
     * Disallow `@use` without a namespace (i.e. `@use "..." as *`).
     *
     * @see {@link https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/at-use-no-unnamespaced/README.md}
     */
    "scss/at-use-no-unnamespaced": true,

    /**
     * Disallow `/*`-comments.
     *
     * @see {@link https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/comment-no-loud/README.md}
     */
    "scss/comment-no-loud": true,

    /**
     * Disallow properties with `-` in their names to be in a form of a nested
     * group.
     *
     * @see {@link https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/declaration-nested-properties/README.md}
     */
    "scss/declaration-nested-properties": "never",

    /**
     * Disallow non-numeric values when interpolating a value with a unit.
     *
     * @see {@link https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/dimension-no-non-numeric-values/README.md}
     */
    "scss/dimension-no-non-numeric-values": true,

    /**
     * Require a newline after the colon in `$`-variable declarations.
     *
     * @see {@link https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/dollar-variable-colon-newline-after/README.md}
     */
    "scss/dollar-variable-colon-newline-after": "always-multi-line",

    /**
     * Require a single empty line after `$`-variable declarations.
     *
     * @see {@link https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/dollar-variable-empty-line-after/README.md}
     */
    "scss/dollar-variable-empty-line-after": [
      "always",
      {
        except: ["before-dollar-variable", "last-nested"],
        ignore: ["before-comment", "inside-single-line-block"],
      },
    ],

    /**
     * Disallow assignment to namespaced Sass variables.
     *
     * @see {@link https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/dollar-variable-no-namespaced-assignment/README.md}
     */
    "scss/dollar-variable-no-namespaced-assignment": true,

    /**
     * Encourage the use of the `scale-color` function over regular color
     * functions.
     *
     * @see {@link https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/function-color-relative/README.md}
     */
    "scss/function-color-relative": true,

    /**
     * Disallow unknown functions.
     *
     * @see {@link https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/function-no-unknown/README.md}
     */
    "scss/function-no-unknown": true,

    /**
     * Disallow duplicate mixins within a stylesheet.
     *
     * @see {@link https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/no-duplicate-mixins/README.md}
     */
    "scss/no-duplicate-mixins": true,

    /**
     * Disallow the use of global function names, as these global functions are
     * now located inside built-in Sass modules.
     *
     * @see {@link https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/no-global-function-names/README.md}
     */
    "scss/no-global-function-names": true,

    /**
     * Disallow redundant nesting selectors (`&`).
     *
     * @see {@link https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/selector-no-redundant-nesting-selector/README.md}
     */
    "scss/selector-no-redundant-nesting-selector": true,

    /**
     * Disallow union class names with the parent selector (`&`).
     *
     * @see {@link https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/selector-no-union-class-name/README.md}
     */
    "scss/selector-no-union-class-name": true,

    /**
     * Require a newline after the closing brace of blocks.
     *
     * @see {@link https://github.com/stylelint-stylistic/stylelint-stylistic/tree/main/lib/rules/block-closing-brace-newline-after}
     */
    "@stylistic/block-closing-brace-newline-after": [
      "always",
      {
        ignoreAtRules: ["if", "else"],
      },
    ],

    /**
     * Specify Unix or Windows linebreaks.
     *
     * @see {@link https://github.com/stylelint-stylistic/stylelint-stylistic/tree/main/lib/rules/linebreaks}
     */
    "@stylistic/linebreaks": "unix",

    /**
     * Disallow the Unicode Byte Order Mark.
     *
     * @see {@link https://github.com/stylelint-stylistic/stylelint-stylistic/tree/main/lib/rules/unicode-bom}
     */
    "@stylistic/unicode-bom": "never",
  },
};