refactor the whole damn thing

src/Util/EventHandler.js

@@ -0,0 +1,34 @@
+
+export default class EventHandler {
+  constructor () {
+    this.eventListeners = []
+  }
+  destroy () {
+    this.eventListeners = null
+  }
+  addEventListener (f) {
+    this.eventListeners.push(f)
+  }
+  removeEventListener (f) {
+    this.eventListeners = this.eventListeners.filter(function (g) {
+      return f !== g
+    })
+  }
+  removeAllEventListeners () {
+    this.eventListeners = []
+  }
+  callEventListeners (event) {
+    for (var i = 0; i < this.eventListeners.length; i++) {
+      try {
+        this.eventListeners[i](event)
+      } catch (e) {
+        /*
+          Your observer threw an error. This error was caught so that Yjs
+          can ensure data consistency! In order to debug this error you
+          have to check "Pause On Caught Exceptions" in developer tools.
+        */
+        console.error(e)
+      }
+    }
+  }
+}