in src/backend/util/Observable.js [576:591]
error(error, isUncaughtThrownError) {
if (closed || !observer.error) {
closed = true;
hostReportError(error, isUncaughtThrownError || false);
doCleanup();
} else {
closed = true;
try {
observer.error(error);
} catch (error2) {
hostReportError(error2, true /* isUncaughtThrownError */);
} finally {
doCleanup();
}
}
},