.stylelintrc

{
  'plugins': [
    "stylelint-declaration-strict-value"
  ],
  'rules': {
    "at-rule-empty-line-before": [ "always", {
      "severity": "warning",
      "ignore": [ "inside-block", "blockless-after-blockless", "after-comment" ]
    }],
    "at-rule-name-case": "lower",
    "at-rule-name-space-after": "always",
    "at-rule-no-vendor-prefix": true,
    "at-rule-semicolon-newline-after": "always",
    "at-rule-semicolon-space-before": "never",
    "block-closing-brace-empty-line-before": "never",
    "block-closing-brace-newline-before": "always-multi-line",
    "block-closing-brace-space-before": [ "always-single-line" ],
    "block-no-empty": true,
    "block-opening-brace-space-after": [ "always-single-line" ],
    "block-opening-brace-space-before": [ "always" ],
    "color-named": "never",
    "color-no-invalid-hex": true,
    "comment-no-empty": true,
    "comment-whitespace-inside": "always",
    "declaration-bang-space-before": "always",
    "declaration-block-semicolon-newline-after": "always-multi-line",
    "declaration-block-semicolon-newline-before": "never-multi-line",
    "declaration-block-semicolon-space-before": "never",
    "declaration-block-trailing-semicolon": "always",
    "declaration-colon-space-after": "always",
    "declaration-colon-space-before": "never",
    "declaration-no-important": true,
    "function-calc-no-unspaced-operator": true,
    "function-linear-gradient-no-nonstandard-direction": true,
    "function-name-case": "lower",
    "function-whitespace-after": "always",
    "keyframe-declaration-no-important": true,
    "max-nesting-depth": 3,
    "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-parentheses-space-inside": "always",
    "media-feature-range-operator-space-after": "always",
    "media-feature-range-operator-space-before": "always",
    "media-query-list-comma-space-after": "always-single-line",
    "no-duplicate-selectors": true,
    "no-empty-source": true,
    "no-eol-whitespace": [ true, {
      ignore: 'empty-lines'
    }],
    "no-extra-semicolons": true,
    "no-unknown-animations": true,
    "number-no-trailing-zeros": true,
    "property-case": "lower",
    "property-no-unknown": [ true ],
    "rule-empty-line-before": [ "always-multi-line", {
      ignore: [ "after-comment", "inside-block" ]
    }],
    "scale-unlimited/declaration-strict-value": [ "color", {
      "ignoreKeywords": ["inherit", "transparent"]
    }],
    "selector-combinator-space-after": "always",
    "selector-combinator-space-before": "always",
    "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-max-id": 0,
    "selector-max-type": [ 0, {
      ignore: [ 'compounded', 'descendant']
    }],
    "selector-pseudo-class-case": "lower",
    "selector-pseudo-class-no-unknown": true,
    "selector-pseudo-class-parentheses-space-inside": "always",
    "selector-pseudo-element-case": "lower",
    "selector-pseudo-element-colon-notation": "single",
    "selector-pseudo-element-no-unknown": true,
    "selector-type-case": "lower",
    "selector-type-no-unknown": true,
    "string-no-newline": true,
    "string-quotes": "single",
    "unit-case": "lower",
    "unit-no-unknown": true,
    "value-keyword-case": [ "lower", {
      # ignores font family keywords in quotes
      ignoreKeywords: [ '/[^"]*/']
    }],
    "value-list-comma-newline-after": "always-multi-line",
    "value-list-comma-space-after": "always-single-line",
  }
}