How add function to inline webpack loader style-loader?

before:

function insertAtTop(element) {
    var parent = document.querySelector("head");
    var lastInsertedElement = window._lastElementInsertedByStyleLoader;
    if (!lastInsertedElement) {
      parent.insertBefore(element, parent.firstChild);
    } else if (lastInsertedElement.nextSibling) {
      parent.insertBefore(element, lastInsertedElement.nextSibling);
    } else {
      parent.appendChild(element);
    }
    window._lastElementInsertedByStyleLoader = element;
}
import '!style-loader!css-loader!sass-loader!./styles.scss';

must be:

import '!style-loader?insert=function!css-loader!sass-loader!./styles.scss';