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import Prefixer from "./prefixer.js";
class AtRule extends Prefixer {  /**   * Clone and add prefixes for at-rule   */  add(rule, prefix) {    let prefixed = prefix + rule.name;
    let already = rule.parent.some(      (i) => i.name === prefixed && i.params === rule.params,    );    if (already) {      return undefined;    }
    let cloned = this.clone(rule, { name: prefixed });    return rule.parent.insertBefore(rule, cloned);  }
  /**   * Clone node with prefixes   */  process(node) {    let parent = this.parentPrefix(node);
    for (let prefix of this.prefixes) {      if (!parent || parent === prefix) {        this.add(node, prefix);      }    }  }}
export default AtRule;