.stylelintrc.json

{
    "plugins": ["./linters/stylelint-header"],
    "extends": ["stylelint-config-standard"],
    "rules": {
        "header/header": ["config/license.js", {}],
        "length-zero-no-unit": [true, { "ignore": "custom-properties" }],
        "selector-type-no-unknown": [true, { "ignore": ["custom-elements"] }],
        "selector-pseudo-element-colon-notation": ["single", {}],
        "custom-property-pattern": "^_?([a-z][a-z0-9]*)(-[a-z0-9]+)*$",
        "no-duplicate-selectors": null,
        "selector-class-pattern": null,
        "no-descending-specificity": null,
        "declaration-block-no-redundant-longhand-properties": null
    },
    "overrides": [
        {
            "files": [
                "packages/**/src/spectrum-*.css",
                "tools/**/src/spectrum-*.css",
                "tools/styles/**/*.css"
            ],
            "extends": [],
            "rules": {
                "header/header": ["config/license.js", {}]
            }
        }
    ]
}