fix(event-listeners-manager/add): _listeners is a Map

@vates/event-listeners-manager/index.js

@@ -9,7 +9,7 @@ exports.EventListenersManager = class EventListenersManager {
   }
 
   add(type, listener) {
-    let listeners = this._listeners[type]
+    let listeners = this._listeners.get(type)
     if (listeners === undefined) {
       listeners = new Set()
       this._listeners.set(type, listeners)

CHANGELOG.unreleased.md

@@ -29,6 +29,7 @@
 
 <!--packages-start-->
 
+- @vates/event-listeners-manager patch
 - @vates/read-chunk major
 - xo-server patch