diff --git a/src/eventBus.js b/src/eventBus.js
index 68c120f..506510c 100644
--- a/src/eventBus.js
+++ b/src/eventBus.js
@@ -1,5 +1,24 @@
-import { createApp } from 'vue';
+import mitt from 'mitt';
 
-const eventBus = createApp();
+const emitter = mitt();
 
-export default eventBus;
+function once(event, handler) {
+  const wrapper = (...args) => {
+    emitter.off(event, wrapper);
+    handler(...args);
+  };
+  emitter.on(event, wrapper);
+}
+
+export default {
+  // Vue 2-style alias
+  $on: emitter.on,
+  $off: emitter.off,
+  $emit: emitter.emit,
+  $once: once,
+  // Plain methods used by PS4 branch
+  on: emitter.on,
+  off: emitter.off,
+  emit: emitter.emit,
+  once,
+};