.stylelintrc

{
  "rules": {
    "at-rule-name-case": "lower",
    "at-rule-name-space-after": "always-single-line",
    "at-rule-semicolon-newline-after": "always",

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

    "selector-pseudo-element-colon-notation": "single",
    "selector-pseudo-element-case": "lower",
    "selector-max-specificity": "0,7,2",
    "selector-type-case": "lower",

    "number-leading-zero": "never",
    "number-no-trailing-zeros": true,
    "unit-whitelist": ["em", "rem", "px", "%", "s", "vh", "vw", "deg", "ms"],

    "color-hex-case": "upper",
    "color-named": "never",
    "color-hex-length": "short",
    "color-no-invalid-hex": true,

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

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

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

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

    "time-min-milliseconds": 100,

    "unit-case": "lower",

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

    "max-empty-lines": 2,
    "indentation": [ 2, {
      "indentInsideParens": "twice"
    }],
    "max-nesting-depth": 4,
    "no-descending-specificity": true,
    "no-empty-source": true,
    "no-eol-whitespace": true,
    "no-extra-semicolons": true,
    "no-unknown-animations": true,

    "declaration-colon-space-after": "always",
    "declaration-colon-space-before": "never",
    "block-no-empty": true,
    "shorthand-property-no-redundant-values": true,

    "declaration-empty-line-before": [
      "always",
      {
        "except": [
          "after-declaration",
          "first-nested"
        ]
      }
    ],
    "block-closing-brace-empty-line-before": "never",
    "rule-empty-line-before": [
      "always-multi-line"
    ],
    "at-rule-empty-line-before": [
      "always",
      {
        "except": [
          "blockless-after-same-name-blockless",
          "first-nested"
        ],
        "ignore": [
          "after-comment"
        ]
      }
    ],
    "at-rule-no-unknown": [
      true,
      {
        "ignoreAtRules": [
          "include",
          "mixin",
          "content",
          "at-root"
        ]
      }
    ],
    "block-opening-brace-newline-after": "always-multi-line",
    "block-opening-brace-space-before": "always",
    "block-opening-brace-space-after": "always-single-line"
  }
}