.stylelintrc

{
  "rules": {
    "at-rule-empty-line-before": [
      "always", {
        "except": ["first-nested", "blockless-group"]
    } ],
    "at-rule-no-vendor-prefix": true,

    "block-no-single-line": true,
    "block-closing-brace-newline-after": "always",
    "block-closing-brace-newline-before": "always",
    "block-opening-brace-newline-after": "always",
    "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", "between-comments"]
    } ],
    "comment-whitespace-inside": "always",

    "declaration-no-important": true,
    "declaration-bang-space-after": "never",
    "declaration-bang-space-before": "always",

    "declaration-block-semicolon-newline-after": "always",
    "declaration-block-semicolon-space-before": "never",
    "declaration-block-trailing-semicolon": "always",
    "declaration-colon-space-after": "always-single-line",
    "declaration-colon-space-before": "never",

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

    "function-calc-no-unspaced-operator": true,
    "function-comma-newline-after": "always-multi-line",
    "function-comma-space-after": "always",
    "function-comma-space-before": "never",
    "function-linear-gradient-no-nonstandard-direction": true,
    "function-parentheses-newline-inside": "always-multi-line",
    "function-parentheses-space-inside": "never-single-line",
    "function-url-quotes": "always",
    "function-whitespace-after": "always",

    "indentation": 2,

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

    "max-line-length": [ 120, {
      "ignore": "non-comments",
    } ],

    "max-nesting-depth": 3,

    "media-feature-colon-space-after": "always",
    "media-feature-colon-space-before": "never",
    "media-feature-name-no-vendor-prefix": true,
    "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-feature-parentheses-space-inside": "never",

    "no-browser-hacks": true,
    "no-eol-whitespace": true,

    "no-invalid-double-slash-comments": true,
    "no-missing-end-of-source-newline": true,
    "no-unknown-animations": true,

    "number-leading-zero": "always",

    "number-max-precision": 4,

    "property-no-vendor-prefix": true,

    "root-no-standard-properties": true,

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

    "selector-class-pattern": "^[a-z]+[a-zA-Z0-9\\-]*[a-zA-Z0-9]*$",

    "selector-combinator-space-after": "always",
    "selector-combinator-space-before": "always",

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

    "selector-no-id": true,
    "selector-no-type": true,
    "selector-no-universal": true,
    "selector-no-vendor-prefix": true,
    "selector-pseudo-element-colon-notation": "double",
    "selector-root-no-composition": true,

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

    "time-no-imperceptible": true,

    "value-list-comma-space-after": "always-single-line",
    "value-list-comma-space-before": "never",
    "value-no-vendor-prefix": true
  }
}