.stylelintrc

# https://stylelint.io/user-guide/cli/
# npm install -g stylelint
# stylelint --help

# Autofixing errors:
#   stylelint "foo/*.css" --fix

{
 "plugins": [
    "stylelint-order"
  ],
  "rules": {
   "at-rule-no-unknown": true,
    "block-no-empty": true,
    "color-no-invalid-hex": true,
    "comment-no-empty": true,
    "declaration-block-no-duplicate-properties": [
      true,
      {
        ignore: ["consecutive-duplicates-with-different-values"]
      }
    ],
    "declaration-block-no-shorthand-property-overrides": true,
    "font-family-no-duplicate-names": true,
    "font-family-no-missing-generic-family-keyword": true,
    "function-calc-no-unspaced-operator": true,
    "function-linear-gradient-no-nonstandard-direction": true,
    "keyframe-declaration-no-important": true,
    "media-feature-name-no-unknown": true,
    # "no-descending-specificity": true, #Use this if specificity fixes are required
    "no-duplicate-at-import-rules": true,
    "no-duplicate-selectors": true,
    "no-empty-source": true,
    "no-extra-semicolons": true,
    "no-invalid-double-slash-comments": true,
    "property-no-unknown": true,
    "selector-pseudo-class-no-unknown": true,
    "selector-pseudo-element-no-unknown": true,
    "selector-type-no-unknown": true,
    "string-no-newline": true,
    "unit-no-unknown": true,
    "at-rule-empty-line-before": [ "always", {
      except: [
        "blockless-after-same-name-blockless",
        "first-nested",
      ],
      ignore: ["after-comment"],
    } ],
    "at-rule-name-case": "lower",
    "at-rule-name-space-after": "always-single-line",
    "at-rule-semicolon-newline-after": "always",
    "block-closing-brace-empty-line-before": "never",
    "block-closing-brace-newline-after": "always",
    "block-closing-brace-newline-before": "always-multi-line",
    "block-closing-brace-space-before": "always-single-line",
    "block-opening-brace-newline-after": "always-multi-line",
    "block-opening-brace-space-after": "always-single-line",
    "block-opening-brace-space-before": "always",
    "color-hex-case": "lower",
    "color-hex-length": "short",
    "comment-empty-line-before": [ "always", {
      except: ["first-nested"],
      ignore: ["stylelint-commands"],
    } ],
    "comment-whitespace-inside": "always",
    "custom-property-empty-line-before": [ "always", {
      except: [
        "after-custom-property",
        "first-nested",
      ],
      ignore: [
        "after-comment",
        "inside-single-line-block",
      ],
    } ],
    "declaration-bang-space-after": "never",
    "declaration-bang-space-before": "always",
    "declaration-block-semicolon-newline-after": "always-multi-line",
    "declaration-block-semicolon-space-after": "always-single-line",
    "declaration-block-semicolon-space-before": "never",
    "declaration-block-single-line-max-declarations": 1,
    "declaration-block-trailing-semicolon": "always",
    "declaration-colon-newline-after": "always-multi-line",
    "declaration-colon-space-after": "always-single-line",
    "declaration-colon-space-before": "never",
    "declaration-empty-line-before": [ "always", {
      except: [
        "after-declaration",
        "first-nested",
      ],
      ignore: [
        "after-comment",
        "inside-single-line-block",
      ],
    } ],
    "function-comma-newline-after": "always-multi-line",
    "function-comma-space-after": "always-single-line",
    "function-comma-space-before": "never",
    "function-max-empty-lines": 0,
    "function-name-case": "lower",
    "function-parentheses-newline-inside": "always-multi-line",
    "function-parentheses-space-inside": "never-single-line",
    "function-whitespace-after": "always",
    "indentation": 2,
    "length-zero-no-unit": true,
    "max-empty-lines": 1,
    "media-feature-colon-space-after": "always",
    "media-feature-colon-space-before": "never",
    "media-feature-name-case": "lower",
    "media-feature-parentheses-space-inside": "never",
    "media-feature-range-operator-space-after": "always",
    "media-feature-range-operator-space-before": "always",
    "media-query-list-comma-newline-after": "always-multi-line",
    "media-query-list-comma-space-after": "always-single-line",
    "media-query-list-comma-space-before": "never",
    "no-eol-whitespace": true,
    "no-missing-end-of-source-newline": true,
    "number-leading-zero": "always",
    "number-no-trailing-zeros": true,
    "order/properties-order": [
      "position",
      "top",
      "right",
      "bottom",
      "left",
      "z-index",
      "box-sizing",
      "display",
      "flex",
      "flex-align",
      "flex-basis",
      "flex-direction",
      "flex-wrap",
      "flex-flow",
      "flex-shrink",
      "flex-grow",
      "flex-order",
      "flex-pack",
      "align-content",
      "align-items",
      "align-self",
      "justify-content",
      "order",
      "float",
      "width",
      "min-width",
      "max-width",
      "height",
      "min-height",
      "max-height",
      "padding",
      "padding-top",
      "padding-right",
      "padding-bottom",
      "padding-left",
      "margin",
      "margin-top",
      "margin-right",
      "margin-bottom",
      "margin-left",
      "overflow",
      "overflow-x",
      "overflow-y",
      "-webkit-overflow-scrolling",
      "-ms-overflow-x",
      "-ms-overflow-y",
      "-ms-overflow-style",
      "columns",
      "column-count",
      "column-fill",
      "column-gap",
      "column-rule",
      "column-rule-width",
      "column-rule-style",
      "column-rule-color",
      "column-span",
      "column-width",
      "orphans",
      "widows",
      "clip",
      "clear",
      "font",
      "font-family",
      "font-size",
      "font-style",
      "font-weight",
      "font-variant",
      "font-size-adjust",
      "font-stretch",
      "font-effect",
      "font-emphasize",
      "font-emphasize-position",
      "font-emphasize-style",
      "font-smooth",
      "src",
      "hyphens",
      "line-height",
      "color",
      "text-align",
      "text-align-last",
      "text-emphasis",
      "text-emphasis-color",
      "text-emphasis-style",
      "text-emphasis-position",
      "text-decoration",
      "text-indent",
      "text-justify",
      "text-outline",
      "-ms-text-overflow",
      "text-overflow",
      "text-overflow-ellipsis",
      "text-overflow-mode",
      "text-shadow",
      "text-transform",
      "text-wrap",
      "-webkit-text-size-adjust",
      "-ms-text-size-adjust",
      "letter-spacing",
      "-ms-word-break",
      "word-break",
      "word-spacing",
      "-ms-word-wrap",
      "word-wrap",
      "overflow-wrap",
      "tab-size",
      "white-space",
      "vertical-align",
      "direction",
      "unicode-bidi",
      "list-style",
      "list-style-position",
      "list-style-type",
      "list-style-image",
      "pointer-events",
      "-ms-touch-action",
      "touch-action",
      "cursor",
      "visibility",
      "zoom",
      "table-layout",
      "empty-cells",
      "caption-side",
      "border-spacing",
      "border-collapse",
      "content",
      "quotes",
      "counter-reset",
      "counter-increment",
      "resize",
      "user-select",
      "nav-index",
      "nav-up",
      "nav-right",
      "nav-down",
      "nav-left",
      "background",
      "background-color",
      "background-image",
      "filter",
      "background-repeat",
      "background-attachment",
      "background-position",
      "background-position-x",
      "background-position-y",
      "background-clip",
      "background-origin",
      "background-size",
      "border",
      "border-color",
      "border-style",
      "border-width",
      "border-top",
      "border-top-color",
      "border-top-style",
      "border-top-width",
      "border-right",
      "border-right-color",
      "border-right-style",
      "border-right-width",
      "border-bottom",
      "border-bottom-color",
      "border-bottom-style",
      "border-bottom-width",
      "border-left",
      "border-left-color",
      "border-left-style",
      "border-left-width",
      "border-radius",
      "border-top-left-radius",
      "border-top-right-radius",
      "border-bottom-right-radius",
      "border-bottom-left-radius",
      "border-image",
      "border-image-source",
      "border-image-slice",
      "border-image-width",
      "border-image-outset",
      "border-image-repeat",
      "outline",
      "outline-width",
      "outline-style",
      "outline-color",
      "outline-offset",
      "box-shadow",
      "opacity",
      "-ms-interpolation-mode",
      "page-break-after",
      "page-break-before",
      "page-break-inside",
      "transition",
      "transition-delay",
      "transition-timing-function",
      "transition-duration",
      "transition-property",
      "transform",
      "transform-origin",
      "perspective",
      "appearance",
      "animation",
      "animation-name",
      "animation-duration",
      "animation-play-state",
      "animation-timing-function",
      "animation-delay",
      "animation-iteration-count",
      "animation-direction",
      "animation-fill-mode",
      "fill",
      "stroke"
    ],
    "property-case": "lower",
    "rule-empty-line-before": [ "always-multi-line", {
      except: ["first-nested"],
      ignore: ["after-comment"],
    } ],
    "selector-attribute-brackets-space-inside": "never",
    "selector-attribute-operator-space-after": "never",
    "selector-attribute-operator-space-before": "never",
    "selector-combinator-space-after": "always",
    "selector-combinator-space-before": "always",
    "selector-descendant-combinator-no-non-space": true,
    "selector-list-comma-newline-after": "always",
    "selector-list-comma-space-before": "never",
    "selector-max-empty-lines": 0,
    "selector-pseudo-class-case": "lower",
    "selector-pseudo-class-parentheses-space-inside": "never",
    "selector-pseudo-element-case": "lower",
    "selector-pseudo-element-colon-notation": "double",
    "selector-type-case": "lower",
    "unit-case": "lower",
    "value-list-comma-newline-after": "always-multi-line",
    "value-list-comma-space-after": "always-single-line",
    "value-list-comma-space-before": "never",
    "value-list-max-empty-lines": 0,
  },
}