.stylelintrc.json

{
  "plugins": [
    "stylelint-scss"
  ],

  "rules": {
    "color-hex-case": "lower",
    "color-hex-length": "short",
    "color-named": "never",
    "color-no-invalid-hex": true,

    "font-family-name-quotes": "always-unless-keyword",
    "font-family-no-duplicate-names": true,

    "font-weight-notation": "numeric",

    "function-calc-no-unspaced-operator": true,
    "function-comma-newline-after": "never-multi-line",
    "function-comma-newline-before": "never-multi-line",
    "function-comma-space-after": "always",
    "function-comma-space-before": "never",
    "function-linear-gradient-no-nonstandard-direction": true,
    "function-max-empty-lines": 0,
    "function-name-case": "lower",
    "function-parentheses-newline-inside": "never-multi-line",
    "function-parentheses-space-inside": "never",
    "function-url-quotes": "always",
    "function-whitespace-after": "always",

    "number-leading-zero": "never",
    "number-max-precision": 3,
    "number-no-trailing-zeros": true,

    "string-no-newline": true,
    "string-quotes": "double",

    "length-zero-no-unit": true,

    "unit-case": "lower",
    "unit-no-unknown": true,

    "value-keyword-case": "lower",
    "value-no-vendor-prefix": true,

    "value-list-comma-newline-after": "never-multi-line",
    "value-list-comma-newline-before": "never-multi-line",
    "value-list-comma-space-after": "always",
    "value-list-comma-space-before": "never",
    "value-list-max-empty-lines": 0,

    "custom-property-empty-line-before": "never",
    "custom-property-no-outside-root": true,

    "shorthand-property-no-redundant-values": true,

    "property-case": "lower",
    "property-no-unknown": true,
    "property-no-vendor-prefix": true,

    "declaration-bang-space-after": "never",
    "declaration-bang-space-before": "always",
    "declaration-colon-space-after": "always",
    "declaration-colon-space-before": "never",
    "declaration-empty-line-before": "never",

    "declaration-block-no-duplicate-properties": true,
    "declaration-block-no-ignored-properties": true,
    "declaration-block-no-redundant-longhand-properties": true,
    "declaration-block-properties-order": [[
      "content",

      "display",
      "visibility",

      "flex-direction",
      "flex-flow",
      "flex-wrap",
      "justify-content",
      "align-items",
      "align-content",

      "flex",
      "flex-grow",
      "flex-shrink",
      "flex-basis",
      "align-self",
      "order",

      "float",
      "clear",

      "position",
      "top",
      "right",
      "bottom",
      "left",

      "width",
      "min-width",
      "max-width",
      "height",
      "min-height",
      "max-height",

      "z-index",

      "margin",
      "margin-top",
      "margin-right",
      "margin-bottom",
      "margin-left",

      "padding",
      "padding-top",
      "padding-right",
      "padding-bottom",
      "padding-left",

      "border",
      "border-width",
      "border-style",
      "border-color",
      "border-top",
      "border-top-width",
      "border-top-style",
      "border-top-color",
      "border-right",
      "border-right-width",
      "border-right-style",
      "border-right-color",
      "border-bottom",
      "border-bottom-width",
      "border-bottom-style",
      "border-bottom-color",
      "border-left",
      "border-left-width",
      "border-left-style",
      "border-left-color",
      "border-radius",
      "border-top-left-radius",
      "border-top-right-radius",
      "border-bottom-right-radius",
      "border-bottom-left-radius",

      "outline",
      "outline-width",
      "outline-style",
      "outline-color",
      "outline-offset",

      "box-shadow",

      "color",

      "background",
      "background-color",
      "background-image",
      "background-repeat",
      "background-attachment",
      "background-position",
      "background-position-x",
      "background-position-y",
      "background-clip",
      "background-origin",
      "background-size",

      "opacity",

      "font",
      "font-style",
      "font-variant",
      "font-weight",
      "font-size",
      "font-family",

      "text-align",
      "text-align-last",
      "text-decoration",
      "text-indent",
      "text-justify",
      "text-outline",
      "text-overflow",
      "text-shadow",
      "text-transform",
      "white-space",

      "vertical-align",

      "overflow",
      "overflow-x",
      "overflow-y",
      "overflow-wrap",

      "cursor",
      "pointer-events",
      "user-select",

      "filter",
      "transform",
      "transform-origin",

      "transition",
      "transition-property",
      "transition-duration",
      "transition-timing-function",
      "transition-delay",

      "animation",
      "animation-name",
      "animation-duration",
      "animation-timing-function",
      "animation-delay",
      "animation-iteration-count",
      "animation-direction",
      "animation-fill-mode",
      "animation-play-state"
    ], {
      "unspecified": "bottom"
    }],
    "declaration-block-semicolon-newline-after": "always-multi-line",
    "declaration-block-semicolon-newline-before": "never-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",

    "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-no-empty": true,
    "block-no-single-line": true,
    "block-opening-brace-newline-after": "always-multi-line",
    "block-opening-brace-space-after": "always-single-line",
    "block-opening-brace-space-before": "always",

    "selector-attribute-brackets-space-inside": "never",
    "selector-attribute-operator-space-after": "never",
    "selector-attribute-operator-space-before": "never",
    "selector-attribute-quotes": "always",
    "selector-combinator-space-after": "always",
    "selector-combinator-space-before": "always",
    "selector-descendant-combinator-no-non-space": true,
    "selector-no-empty": true,
    "selector-no-vendor-prefix": true,
    "selector-no-universal": true,
    "selector-pseudo-class-case": "lower",
    "selector-pseudo-class-no-unknown": true,
    "selector-pseudo-class-parentheses-space-inside": "never",
    "selector-pseudo-element-case": "lower",
    "selector-pseudo-element-colon-notation": "double",
    "selector-pseudo-element-no-unknown": true,
    "selector-root-no-composition": true,
    "selector-type-case": "lower",
    "selector-type-no-unknown": true,
    "selector-max-empty-lines": 0,

    "selector-list-comma-newline-after": "always-multi-line",
    "selector-list-comma-newline-before": "never-multi-line",
    "selector-list-comma-space-after": "always-single-line",
    "selector-list-comma-space-before": "never",

    "rule-nested-empty-line-before": ["always", {
      "except": "first-nested",
      "ignore": "after-comment"
    }],
    "rule-non-nested-empty-line-before": ["always", {
      "ignore": "after-comment"
    }],

    "media-feature-colon-space-after": "always",
    "media-feature-colon-space-before": "never",
    "media-feature-name-case": "lower",
    "media-feature-name-no-unknown": true,
    "media-feature-name-no-vendor-prefix": true,
    "media-feature-no-missing-punctuation": true,
    "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-newline-before": "never-multi-line",
    "media-query-list-comma-space-after": "always-single-line",
    "media-query-list-comma-space-before": "never",

    "at-rule-empty-line-before": ["always", {
      "except": ["blockless-group", "first-nested"],
      "ignore": ["after-comment", "all-nested", "blockless-after-same-name-blockless"]
    }],
    "at-rule-name-case": "lower",
    "at-rule-name-newline-after": "always-multi-line",
    "at-rule-name-space-after": "always-single-line",
    "at-rule-no-vendor-prefix": true,
    "at-rule-semicolon-newline-after": "always",

    "stylelint-disable-reason": "always-before",

    "comment-empty-line-before": ["always", {
      "except": ["first-nested"],
      "ignore": ["between-comments", "stylelint-commands"]
    }],
    "comment-no-empty": true,
    "comment-whitespace-inside": "always",

    "indentation": 2,
    "max-empty-lines": 2,
    "no-descending-specificity": true,
    "no-duplicate-selectors": true,
    "no-empty-source": true,
    "no-eol-whitespace": true,
    "no-extra-semicolons": true,
    "no-invalid-double-slash-comments": true,
    "no-missing-end-of-source-newline": true,
    "no-unknown-animations": true,

    "scss/at-import-no-partial-leading-underscore": true,

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

    "scss/dollar-variable-colon-newline-after": "always-multi-line",
    "scss/dollar-variable-colon-space-after": "always-single-line",
    "scss/dollar-variable-colon-space-before": "never",

    "scss/dollar-variable-no-missing-interpolation": true,

    "scss/double-slash-comment-empty-line-before": ["always", {
      "except": ["first-nested"],
      "ignore": ["between-comments", "stylelint-commands"]
    }],
    "scss/double-slash-comment-whitespace-inside": "always",

    "scss/operator-no-newline-after": true,
    "scss/operator-no-newline-before": true,
    "scss/operator-no-unspaced": true,

    "scss/selector-no-redundant-nesting-selector": true
  }
}