remove old event bus code

frontend/composables/use-events.ts

@@ -1,38 +0,0 @@
-export enum EventTypes {
-  // ClearStores event is used to inform the stores that _all_ the data they are using
-  // is now out of date and they should refresh - This is used when the user makes large
-  // changes to the data such as bulk actions or importing a CSV file
-  InvalidStores,
-}
-
-export type EventFn = () => void;
-
-export interface IEventBus {
-  on(event: EventTypes, fn: EventFn, key: string): void;
-  off(event: EventTypes, key: string): void;
-  emit(event: EventTypes): void;
-}
-
-class EventBus implements IEventBus {
-  private listeners: Record<EventTypes, Record<string, EventFn>> = {
-    [EventTypes.InvalidStores]: {},
-  };
-
-  on(event: EventTypes, fn: EventFn, key: string): void {
-    this.listeners[event][key] = fn;
-  }
-
-  off(event: EventTypes, key: string): void {
-    delete this.listeners[event][key];
-  }
-
-  emit(event: EventTypes): void {
-    Object.values(this.listeners[event]).forEach(fn => fn());
-  }
-}
-
-const bus = new EventBus();
-
-export function useEventBus(): IEventBus {
-  return bus;
-}