upgrade code

ui/src/boot/bus.js

@@ -3,12 +3,14 @@
 import { EventBus } from 'quasar'
 import { boot } from 'quasar/wrappers'
 
-export default boot(({ app }) => {
-  const bus = new EventBus()
+const bus = new EventBus()
 
+export default boot(({ app }) => {
   // for Options API
   app.config.globalProperties.$bus = bus
 
   // for Composition API
   app.provide('bus', bus)
 })
+
+export { bus }