1 files changed, 17 insertions, 0 deletions
diff --git a/js/xpconnect/tests/mochitest/private_field_worker.js b/js/xpconnect/tests/mochitest/private_field_worker.js
new file mode 100644
index 0000000000..b62a8a9a60
--- /dev/null
+++ b/js/xpconnect/tests/mochitest/private_field_worker.js
@@ -0,0 +1,17 @@
+class A {
+  #x;
+}
+
+let objects = [];
+
+self.onmessage = function(e) {
+  if (e.data === 'allocate') {
+    objects.push(new A);
+    return;
+  }
+  if (e.data == 'count') {
+    postMessage(objects.length);
+    return;
+  }
+  postMessage('Unknown message type.');
+}
+\ No newline at end of file