.stylelintrc

{
  "extends": "stylelint-config-standard",
  "rules": {
    "indentation": 2,
    "string-quotes": "single",
    "no-duplicate-selectors": true,
    "color-hex-case": "upper",
    "color-hex-length": "long",
    "color-named": "never",
    "selector-no-qualifying-type": true,
    "selector-combinator-space-after": "always",
    "selector-attribute-quotes": "never",
    "selector-attribute-operator-space-before": "never",
    "selector-attribute-operator-space-after": "never",
    "selector-attribute-brackets-space-inside": "never",
    "declaration-block-trailing-semicolon": "always",
    "declaration-colon-space-before": "never",
    "declaration-colon-space-after": "always",
    "property-no-vendor-prefix": true,
    "value-no-vendor-prefix": true,
    "number-leading-zero": "always",
    "function-url-quotes": "never",
    "function-url-data-uris": "never",
    "font-weight-notation": "numeric",
    "font-family-name-quotes": "always-where-required",
    "comment-whitespace-inside": "always",
    "comment-empty-line-before": "always",
    "at-rule-no-vendor-prefix": true,
    "rule-empty-line-before": "always-multi-line",
    "selector-pseudo-element-colon-notation": "double",
    "selector-pseudo-class-parentheses-space-inside": "never",
    "selector-no-vendor-prefix": true,
    "selector-no-type": true,
    "media-feature-range-operator-space-before": "always",
    "media-feature-range-operator-space-after": "always",
    "media-feature-parentheses-space-inside": "never",
    "media-feature-name-no-vendor-prefix": true,
    "media-feature-colon-space-before": "never",
    "media-feature-colon-space-after": "always"
  }
}