.stylelintrc

{
  "rules": {
    "no-duplicate-at-import-rules": true,
    "no-duplicate-selectors": true,
    "no-extra-semicolons": true,
    "no-invalid-double-slash-comments": true,

    "font-family-no-duplicate-names": true,

    "function-calc-no-unspaced-operator": true,

    "string-no-newline": true,
    "block-no-empty": true,
    "comment-no-empty": true,
    "unit-no-unknown": true,
    "property-no-unknown": true,
    "selector-pseudo-class-no-unknown": true,
    "selector-pseudo-element-no-unknown": true,
    "selector-type-no-unknown": true,

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

    "declaration-block-no-duplicate-properties": true,
    "declaration-block-no-shorthand-property-overrides": true,

    "color-no-invalid-hex": true,
    "color-hex-case": "upper",
    "color-hex-length": "long",

    "font-family-name-quotes": "always-unless-keyword",

    "number-leading-zero": "always",
    "number-no-trailing-zeros": true,
    "length-zero-no-unit": true,

    "string-quotes": "double",

    "unit-case": "lower",
    "value-keyword-case": "lower",
    "property-case": "lower",
    "function-name-case": "lower",

    "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",

    "declaration-block-semicolon-newline-after": "always",
    "rule-empty-line-before": [ "always", {
      "ignore": ["after-comment"]
    } ],

    "function-url-quotes": "always",
    "function-whitespace-after": "always",

    "selector-attribute-brackets-space-inside": "never",
    "selector-attribute-operator-space-after": "always",
    "selector-attribute-operator-space-before": "always",
    "selector-attribute-quotes": "always",
    "selector-combinator-space-after": "always",
    "selector-combinator-space-before": "always",
    "selector-pseudo-element-colon-notation": "double",

    "max-line-length": [ 80, {
      "ignore": ["comments"]
    } ],

    "indentation": 4,

    "comment-whitespace-inside": "always",
    "comment-empty-line-before": "always",

    "block-closing-brace-newline-after": "always",
  }
}