.stylelintrc.json

{
  "rules": {
    "at-rule-no-unknown": true,
    "block-no-empty": true,
    "color-no-invalid-hex": true,
    "comment-no-empty": true,
    "declaration-block-no-duplicate-properties": [
      true,
      {
        ignore: ["consecutive-duplicates-with-different-values"]
      }
    ],
    "declaration-block-no-shorthand-property-overrides": true,
    "font-family-no-duplicate-names": true,
    "font-family-no-missing-generic-family-keyword": true,
    "function-calc-no-unspaced-operator": true,
    "function-linear-gradient-no-nonstandard-direction": true,
    "keyframe-declaration-no-important": true,
    "media-feature-name-no-unknown": true,
    "no-descending-specificity": true,
    "no-duplicate-at-import-rules": true,
    "no-duplicate-selectors": true,
    "no-empty-source": true,
    "no-extra-semicolons": true,
    "no-invalid-double-slash-comments": true,
    "property-no-unknown": true,
    "selector-pseudo-class-no-unknown": true,
    "selector-pseudo-element-no-unknown": true,
    "selector-type-no-unknown": true,
    "string-no-newline": true,
    "unit-no-unknown": true,
    "at-rule-empty-line-before": null,
    "block-no-empty": null,
    "color-hex-case": null,
    "color-hex-length": null,
    "comment-empty-line-before": null,
    "declaration-block-no-duplicate-properties": null,
    "declaration-block-no-redundant-longhand-properties": null,
    "declaration-block-no-shorthand-property-overrides": null,
    "declaration-block-trailing-semicolon": null,
    "declaration-colon-space-after": null,
    "function-comma-space-after": null,
    "function-linear-gradient-no-nonstandard-direction": null,
    "function-name-case": null,
    "function-whitespace-after": null,
    "length-zero-no-unit": null,
    "no-empty-source": null,
    "no-unknown-animations": true,
    "number-leading-zero": null,
    "number-no-trailing-zeros": null,
    "property-no-unknown": null,
    "rule-empty-line-before": null,
    "selector-pseudo-element-colon-notation": null,
    "selector-type-no-unknown": null,
    "shorthand-property-no-redundant-values": null,
    "unit-whitelist": ["deg", "em", "ex", "ms", "rem", "%", "s", "px"]
  },
  "ignoreFiles": [
    "vendor/**/*.css",
    "assets/vendor/**/*.css",
    "tests/Drupal/Tests/Core/Asset/css_test_files/**/*.css"
  ]
}