michitomo
diff --git a/‎dist/lib/event_handler.d.ts.map
+1-1 b/‎dist/lib/event_handler.d.ts.map
+1-1
diff --git a/‎lib/event_handler.js
+2-1 b/‎lib/event_handler.js
+2-1
@@ -39,7 +39,7 @@ export class RealtimeEventHandler {
   on(eventName, callback) {
     this.eventHandlers[eventName] = this.eventHandlers[eventName] || [];
     this.eventHandlers[eventName].push(callback);
-    callback;
+    return callback;
   }
 
   /**
@@ -51,6 +51,7 @@ export class RealtimeEventHandler {
   onNext(eventName, callback) {
     this.nextEventHandlers[eventName] = this.nextEventHandlers[eventName] || [];
     this.nextEventHandlers[eventName].push(callback);
+    return callback;
   }
 
   /**
Original file line number	Diff line number	Diff line change
`@@ -39,7 +39,7 @@ export class RealtimeEventHandler {`
`39`	`39`	`on(eventName, callback) {`
`40`	`40`	`this.eventHandlers[eventName] = this.eventHandlers[eventName] \|\| [];`
`41`	`41`	`this.eventHandlers[eventName].push(callback);`
`42`		`- callback;`
	`42`	`+ return callback;`
`43`	`43`	`}`
`44`	`44`
`45`	`45`	`/**`
`@@ -51,6 +51,7 @@ export class RealtimeEventHandler {`
`51`	`51`	`onNext(eventName, callback) {`
`52`	`52`	`this.nextEventHandlers[eventName] = this.nextEventHandlers[eventName] \|\| [];`
`53`	`53`	`this.nextEventHandlers[eventName].push(callback);`
	`54`	`+ return callback;`
`54`	`55`	`}`
`55`	`56`
`56`	`57`	`/**`