Adding support for multiple event listeners which also fixes memory leak bug with addEventListener replacing listeners without removing.

Author: JoL0712

index.d.ts

@@ -75,6 +75,7 @@ declare module 'react-native-callkeep' {
   }
 
   type HandleType = 'generic' | 'number' | 'email';
+  type EventListener = {};
 
   export type AudioRoute = {
     name: string,
@@ -134,9 +135,14 @@ declare module 'react-native-callkeep' {
     static addEventListener<Event extends Events>(
       type: Event,
       handler: EventHandlers[Event],
-    ): void
+    ): EventListener
 
-    static removeEventListener(type: Events): void
+    /**
+     * @description Remove specific event listener if given, otherwise remove all belonging to the given event type.
+     * @param type 
+     * @param listener 
+     */
+    static removeEventListener(type: Events, listener?: EventListener): void
 
     static setup(options: IOptions): Promise<boolean>
 

index.js

@@ -27,17 +27,32 @@ class RNCallKeep {
   addEventListener = (type, handler) => {
     const listener = listeners[type](handler);
 
-    this._callkeepEventHandlers.set(type, listener);
+    const listenerSet = this._callkeepEventHandlers.get(type) ?? new Set();
+    listenerSet.add(listener);
+
+    this._callkeepEventHandlers.set(type, listenerSet);
+
+    return listener;
   };
 
-  removeEventListener = (type) => {
-    const listener = this._callkeepEventHandlers.get(type);
-    if (!listener) {
+  removeEventListener = (type, listener = undefined) => {
+    const listenerSet = this._callkeepEventHandlers.get(type);
+    if (!listenerSet) {
       return;
     }
 
-    listener.remove();
-    this._callkeepEventHandlers.delete(type);
+    if (listener) {
+      listenerSet.delete(listener);
+      listener.remove();
+      if (listenerSet.size <= 0) {
+        this._callkeepEventHandlers.delete(type);
+      }
+    } else {
+      listenerSet.forEach((listener) => {
+        listener.remove();
+      });
+      this._callkeepEventHandlers.delete(type);
+    }
   };
 
   setup = async (options) => {