discourse/app/assets/javascripts/discourse/helpers/loading-spinner.js

import { htmlHelper } from "discourse-common/lib/helpers";

function renderSpinner(cssClass) {
  var html = "<div class='spinner";
  if (cssClass) {
    html += " " + cssClass;
  }
  return html + "'></div>";
}
var spinnerHTML = renderSpinner();

export default htmlHelper(params => {
  const hash = params.hash;
  return renderSpinner(hash && hash.size ? hash.size : undefined);
});

export { spinnerHTML, renderSpinner };