workers: minimal error handling and async module loading (#3665)

1 files changed, 12 insertions, 0 deletions

diff --git a/cli/tests/subdir/test_worker.js b/cli/tests/subdir/test_worker.js
index 53d38ba96..cec5bdf9b 100644
--- a/cli/tests/subdir/test_worker.js
+++ b/cli/tests/subdir/test_worker.js
@@ -1,7 +1,19 @@
+let thrown = false;
+
 onmessage = function(e) {
   console.log(e.data);
 
+  if (thrown === false) {
+    thrown = true;
+    throw new SyntaxError("[test error]");
+  }
+
   postMessage(e.data);
 
   workerClose();
 };
+
+onerror = function() {
+  console.log("called onerror in worker");
+  return false;
+};