.stylelintrc.json

{
  "extends": ["stylelint-config-recommended", "stylelint-config-recess-order"],

  "plugins": [
    "stylelint-declaration-block-no-ignored-properties",
    "stylelint-no-unsupported-browser-features"
  ],

  "rules": {
    "font-family-no-missing-generic-family-keyword": true,

    "plugin/declaration-block-no-ignored-properties": true,

    "plugin/no-unsupported-browser-features": [
      true,
      {
        "browsers": ["Chrome > 88"],
        "ignore": ["css-masks"],
        "ignorePartialSupport": true
      }
    ],

    "indentation": ["tab", { "severity": "warning" }],

    "no-irregular-whitespace": true,
    "no-eol-whitespace": [true, { "severity": "warning" }],
    "block-no-empty": [true, { "ignore": ["comments"], "severity": "warning" }],
    "no-empty-first-line": [true, { "severity": "warning" }],
    "no-missing-end-of-source-newline": [true, { "severity": "warning" }],
    "max-empty-lines": [1, { "severity": "warning" }],
    "rule-empty-line-before": [
      "always-multi-line",
      {
        "ignore": ["after-comment", "inside-block"],
        "severity": "warning"
      }
    ],
    "comment-empty-line-before": [
      "always",
      {
        "except": ["first-nested"],
        "ignore": ["after-comment", "stylelint-commands"],
        "ignoreComments": ["/: .*;/", "/^#endregion/"],
        "severity": "warning"
      }
    ],

    "length-zero-no-unit": [
      true,
      { "severity": "warning", "ignore": ["custom-properties"] }
    ],
    "number-leading-zero": ["always", { "severity": "warning" }],
    "number-max-precision": 3,
    "time-min-milliseconds": [150, { "severity": "warning" }],

    "shorthand-property-no-redundant-values": [true, { "severity": "warning" }],
    "declaration-block-no-redundant-longhand-properties": true,
    "declaration-block-no-shorthand-property-overrides": true,

    "color-hex-case": ["upper", { "severity": "warning" }],
    "property-case": ["lower", { "severity": "warning" }],
    "function-name-case": ["lower", { "severity": "warning" }],
    "selector-pseudo-class-case": ["lower", { "severity": "warning" }],
    "selector-pseudo-element-case": ["lower", { "severity": "warning" }],
    "selector-type-case": ["lower", { "severity": "warning" }],
    "unit-case": ["lower", { "severity": "warning" }],
    "value-keyword-case": ["lower", { "severity": "warning" }],

    "hue-degree-notation": ["number", { "severity": "warning" }],
    "alpha-value-notation": [
      "percentage",
      { "exceptProperties": ["opacity"], "severity": "warning" }
    ],

    "string-quotes": ["double", { "severity": "warning" }],
    "font-family-name-quotes": "always-unless-keyword",
    "function-url-quotes": "always",
    "no-extra-semicolons": [true, { "severity": "warning" }],

    "at-rule-name-space-after": "always-single-line",
    "at-rule-semicolon-newline-after": "always",
    "at-rule-no-unknown": null,

    "block-closing-brace-empty-line-before": [
      "never",
      { "severity": "warning" }
    ],
    "block-closing-brace-newline-after": ["always", { "severity": "warning" }],
    "block-closing-brace-newline-before": [
      "always-multi-line",
      { "severity": "warning" }
    ],
    "block-closing-brace-space-before": [
      "always-single-line",
      { "severity": "warning" }
    ],
    "block-opening-brace-newline-after": [
      "always-multi-line",
      { "severity": "warning" }
    ],
    "block-opening-brace-space-after": [
      "always-single-line",
      { "severity": "warning" }
    ],
    "block-opening-brace-space-before": ["always", { "severity": "warning" }],

    "custom-property-pattern": [
      "^([a-z][a-z0-9]*)(-[a-z0-9]+)*$",
      { "message": "Expected custom property name to be kebab-case" }
    ],

    "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",
      { "severity": "warning" }
    ],
    "declaration-block-single-line-max-declarations": 1,
    "declaration-block-trailing-semicolon": [
      "always",
      { "severity": "warning" }
    ],
    "declaration-colon-newline-after": "always-multi-line",
    "declaration-colon-space-after": [
      "always-single-line",
      { "severity": "warning" }
    ],
    "declaration-colon-space-before": "never",

    "function-comma-newline-after": "always-multi-line",
    "function-comma-space-after": "always-single-line",
    "function-comma-space-before": "never",
    "function-max-empty-lines": 0,
    "function-parentheses-newline-inside": "always-multi-line",
    "function-parentheses-space-inside": "never-single-line",
    "function-whitespace-after": "always",

    "selector-max-id": 1,
    "selector-attribute-brackets-space-inside": "never",
    "selector-attribute-operator-space-after": "never",
    "selector-attribute-operator-space-before": "never",
    "selector-combinator-space-after": "always",
    "selector-combinator-space-before": "always",
    "selector-descendant-combinator-no-non-space": [
      true,
      { "severity": "warning" }
    ],
    "selector-list-comma-newline-after": "always",
    "selector-list-comma-space-before": "never",
    "selector-max-empty-lines": 0,
    "selector-pseudo-class-parentheses-space-inside": "never",
    "selector-pseudo-element-colon-notation": "double",

    "value-list-comma-newline-after": "never-multi-line",
    "value-list-comma-space-after": "always-single-line",
    "value-list-comma-space-before": "never",
    "value-list-max-empty-lines": 0,

    "selector-no-qualifying-type": null,
    "max-nesting-depth": null,
    "selector-class-pattern": null,
    "selector-max-compound-selectors": null,
    "value-no-vendor-prefix": null,
    "no-invalid-double-slash-comments": null,
    "no-descending-specificity": null
  }
}