Function cleanRule

lib/clean/Rule.js:79–100

(node, item, list, options)

}

export default function cleanRule(node, item, list, options) {
    if (hasNoChildren(node.prelude) || hasNoChildren(node.block)) {
        list.remove(item);
        return;
    }

    // avoid usage filtering for some at-rules
    if (this.atrule && skipUsageFilteringAtrule.has(keyword(this.atrule.name).basename)) {
        return;
    }

    const { usage } = options;

    if (usage && (usage.whitelist !== null || usage.blacklist !== null)) {
        cleanUnused(node.prelude, usage);

        if (hasNoChildren(node.prelude)) {
            list.remove(item);
            return;
        }
    }
};