Stylelint rules (scss syntax)

.stylelintrc.json

{
  "ignoreFiles": ["app/styles/vendor/**"],
  "rules": {
    "at-rule-empty-line-before": ["always", {
      "except": ["blockless-group", "first-nested"],
      "ignore": ["after-comment"]
    }],
    "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-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",
    "color-no-invalid-hex": true,
    "comment-empty-line-before": ["always", {
      "except": ["first-nested"],
      "ignore": ["stylelint-commands"]
    }],
    "comment-whitespace-inside": "always",
    "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": 3,
    "declaration-colon-newline-after": "always-multi-line",
    "declaration-colon-space-after": "always-single-line",
    "declaration-colon-space-before": "never",
    "function-calc-no-unspaced-operator": true,
    "function-comma-newline-after": "always-multi-line",
    "function-comma-space-after": "always-single-line",
    "function-comma-space-before": "never",
    "function-parentheses-newline-inside": "always-multi-line",
    "function-parentheses-space-inside": "never-single-line",
    "function-whitespace-after": "always",
    "function-url-quotes": "single",
    "indentation": 2,
    "max-empty-lines": 1,
    "media-feature-colon-space-after": "always",
    "media-feature-colon-space-before": "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",
    "media-query-parentheses-space-inside": "never",
    "no-eol-whitespace": true,
    "no-missing-eof-newline": true,
    "number-leading-zero": "never",
    "number-zero-length-no-unit": true,
    "rule-nested-empty-line-before": ["always-multi-line", {
      "ignore": ["after-comment"]
    }],
    "rule-no-shorthand-property-overrides": true,
    "rule-trailing-semicolon": "always",
    "rule-properties-order": "alphabetical",
    "rule-no-duplicate-properties": true,
    "selector-combinator-space-after": "always",
    "selector-combinator-space-before": "always",
    "selector-list-comma-newline-after": "always",
    "selector-list-comma-space-before": "never",
    "selector-pseudo-element-colon-notation": "single",
    "value-list-comma-newline-after": "always-multi-line",
    "value-list-comma-space-after": "always-single-line",
    "value-list-comma-space-before": "never"
  }
}