1 files changed, 20 insertions, 0 deletions
diff --git a/app/assets/javascripts/helpers/event_hub_factory.js b/app/assets/javascripts/helpers/event_hub_factory.js
new file mode 100644
index 00000000000..4d7f7550a94
--- /dev/null
+++ b/app/assets/javascripts/helpers/event_hub_factory.js
@@ -0,0 +1,20 @@
+import mitt from 'mitt';
+
+export default () => {
+  const emitter = mitt();
+
+  emitter.once = (event, handler) => {
+    const wrappedHandler = evt => {
+      handler(evt);
+      emitter.off(event, wrappedHandler);
+    };
+    emitter.on(event, wrappedHandler);
+  };
+
+  emitter.$on = emitter.on;
+  emitter.$once = emitter.once;
+  emitter.$off = emitter.off;
+  emitter.$emit = emitter.emit;
+
+  return emitter;
+};