closure.

lighthouse-core/report/v2/renderer/category-renderer.js

@@ -203,11 +203,13 @@ class CategoryRenderer {
  // While we could support rendering multiple groups of manual audits, it doesn't
  // seem desirable for UX or renderer complexity. So we'll throw.
  const groupsIds = Array.from(new Set(manualAudits.map(a => a.group)));
- // eslint-disable-next-line no-console
+ /* eslint-disable no-console */
  console.assert(groupsIds.length <= 1, 'More than 1 manual audit group found.');
+ console.assert(!groupsIds.has(undefined), 'Some manual audits don\'t belong to a group');
+ /* eslint-enable no-console */
  if (!groupsIds.length) return;
 
- const groupId = groupsIds[0];
+ const groupId = /** @type {string} */ (groupsIds[0]);
  const auditGroupElem = this.renderAuditGroup(groupDefinitions[groupId], {expandable: true});
  auditGroupElem.classList.add('lh-audit-group--manual');