How to use the jss.RuleList function in jss

constructor(key, styles, options: RuleOptions) {
    this.key = key
    this.options = options
    this.rules = new RuleList({
      ...options,
      parent: this
    })

    for (const selector in styles) {
      this.rules.add(selector, styles[selector])
    }

    this.rules.process()
  }

function GlobalContainerRule(key, styles, options) {
    _classCallCheck(this, GlobalContainerRule);

    this.type = 'global';

    this.key = key;
    this.options = options;
    this.rules = new _jss.RuleList(_extends({}, options, {
      parent: this
    }));

    for (var selector in styles) {
      this.rules.add(selector, styles[selector], { selector: selector });
    }

    this.rules.process();
  }