.stylelintrc

{
  "extends": "stylelint-config-standard",
  "plugins": [
    "stylelint-scss"
  ],
  "rules": {
    "at-rule-empty-line-before": [
      "always", {
        "except": [
          "blockless-after-same-name-blockless",
          "first-nested",
        ],
        "ignore": [ "after-comment" ],
        "ignoreAtRules": [ "else", "each" ]
      }
    ],
    "at-rule-name-space-after": "always-single-line",
    "at-rule-no-unknown": null,
    "block-closing-brace-newline-after": [
      "always", {
        "ignoreAtRules": ["if", "else"]
      }
    ],
    "declaration-no-important": true,
    "declaration-property-value-blacklist": { "border": ["none"] },
    "function-url-no-scheme-relative": true,
    "function-url-quotes": "always",
    "indentation": 4,
    "max-nesting-depth": 3,
    "no-duplicate-selectors": true,
    "no-empty-source": null,
    "property-no-vendor-prefix": true,
    "selector-class-pattern": "^[a-z\\-_0-9]+$",
    "selector-max-id": 0,
    "selector-no-qualifying-type": true,
    "selector-pseudo-element-colon-notation": "single",
    "string-quotes": "single",

    "scss/at-rule-no-unknown": true,
    "scss/at-extend-no-missing-placeholder": true,
    "scss/at-import-no-partial-leading-underscore": true,
    "scss/selector-no-redundant-nesting-selector": true,
    "scss/at-function-pattern": "^[a-z\\-_0-9]+$",
    "scss/at-mixin-pattern": "^[a-z\\-_0-9]+$",
    "scss/dollar-variable-pattern": "^[a-z\\-_0-9]+$"
  }
}