.stylelintrc.json

{
  "plugins": [
    "stylelint-order",
    "stylelint-scss"
  ],
  "extends": [
    "stylelint-config-standard",
    "stylelint-rscss/config"
  ],
  "rules" : "// https://maximgatilin.github.io/stylelint-config/",
  "rules": {
    "string-quotes": "single",
    "no-duplicate-selectors": true,
    "color-named": "never",
    "selector-attribute-quotes": "always",
    "number-leading-zero": "never",
    "function-url-quotes": "always",
    "font-weight-notation": "numeric",
    "font-family-name-quotes": "always-unless-keyword",

    "declaration-empty-line-before": null,

    "at-rule-no-unknown": "// https://github.com/kristerkari/stylelint-scss/issues/139#issuecomment-316537288",
    "at-rule-no-unknown": [true, {
      "ignoreAtRules": ["extend", "at-root", "debug", "warn", "error", "if", "else", "for", "each", "while", "mixin", "include", "content", "return", "function"]
    }],
    "rule-empty-line-before": ["always", {
      "ignore": ["after-comment", "first-nested"]
    }],
    "at-rule-empty-line-before": null,
    "order/order": [
      "custom-properties",
      {
        "type": "at-rule",
        "name": "extend"
      },
      {
        "type": "at-rule",
        "name": "include",
        "hasBlock": false
      },
      "declarations",
      "rules",
      {
        "type": "at-rule",
        "name": "media",
        "hasBlock": true
      },
      {
        "type": "at-rule",
        "name": "include",
        "parameter": "media",
        "hasBlock": true
      }
    ],

    "selector-max-id": "// disable ids",
    "selector-max-id": 0,

    "declaration-no-important": true,
    "selector-no-qualifying-type": [true, {
      "ignore": "// allow rscss variants on elements",
      "ignore": ["class"]
    }],

    "scss/at-mixin-argumentless-call-parentheses": "never",

    "shorthand-property-no-redundant-values": true,
    "declaration-block-no-duplicate-properties": [true, {
      "ignore": ["consecutive-duplicates-with-different-values"]
    }],

    "rscss/class-format": [
      true,
      {
        "element": "// https://github.com/rstacruz/stylelint-rscss/issues/9#issuecomment-357462211",
        "element": "^([a-z][a-z0-9]*)(-[a-z0-9]+)*$"
      }
    ]
  }
}