class EventManagerimport { EventManager } from "https://deno.land/x/caviar@2.6.6/mod.ts"; Propertieskeys: Array<string>listeners: Map<string, Set<EventHandler>>Methodsclear(): voidemit(event: string, data: Event): voidoff(event: string, listener: EventHandler): voidon(event: string, listener: EventHandler): void