One more place for optional coalescing

src/workerHelpers.no-bundler.js

@@ -17,7 +17,7 @@
 function waitForMsgType(target, type) {
   return new Promise(resolve => {
     target.addEventListener('message', function onMsg({ data }) {
-      if (data == null || data.type !== type) return;
+      if (data?.type !== type) return;
       target.removeEventListener('message', onMsg);
       resolve(data);
     });