Type casted Eventbus instance that would get created (#26)

Author: ashutosh-jena-mindfire

src/editor/index.ts

@@ -184,7 +184,7 @@ export default class Editor {
     })
     // 监听
     this.listener = new Listener()
-    this.eventBus = new EventBus()
+    this.eventBus = new EventBus<EventBusMap>()
     // start up
     const draw = new Draw(
       container,