How to use the css-select.is function in css-select

parent.content.forEach(elem => {
    if (is(proxy(elem), rule.selector)) {
      const style = elem.hasAttr('style') ? elem.attr('style').value.split(';') : []
      for (let key in rule.declarations) {
        style.push(`${key}: ${rule.declarations[key]};`)
      }
      elem.addAttr({
        name: 'style',
        local: 'style',
        value: style.join(' '),
        prefix: ''
      })
    }
    if (!elem.isEmpty()) {
      walk(elem, rule)
    }
  })
}

function selectorMatches(selector, selectProps) {
    const thing = {
        type: "tag",
        name: selectProps.element,
        attribs: {
            id: selectProps.id,
            class: selectProps.class,
        },
    };
    return CSSselect.is(thing, selector);
}

JSAPI.prototype.matches = function(selector) {

   return cssSelect.is(this, selector, cssSelectOpts);

};

export function isMatched(elem, query) {
  return CSSselect.is(elem, resolveQuery(query), {adapter});
}

JSAPI.prototype.matches = function(selector) {
  return cssSelect.is(this, selector, cssSelectOpts);
};

matches: function (selectors) {
        return cssSelect.is(this, selectors);
    },

function isMatched(elem, query) {
  return CSSselect.is(elem, resolveQuery(query), {
    adapter: adapter
  });
}