fix: add missing awaits to register/unregister functions

Author: cybex-dev

CHANGELOG.md

@@ -4,7 +4,8 @@
 * Feat: [Web] Add Twilio Device `updateToken(String)` function to allow updating of active device tokens.
 * Fix: [Web] Twilio Device does not unregister on `unregister()` method call due to 'device.off' not visible in js object causing device event listeners to remain attached on unregistered device.
 * Feat: [Web] Check unnecessary updating device with the same token. 
-* Feat: [Web] Update internal [CallStatus] mapping method. 
+* Feat: [Web] Update internal [CallStatus] mapping method.
+* Fix: [Web] Await Twilio Device `register()` and `unregister()` method calls.
 * Feat: update example.
 * Docs: update CHANGELOG
 

lib/_internal/twilio_voice_web.dart

@@ -319,7 +319,8 @@ class TwilioVoiceWeb extends MethodChannelTwilioVoice {
       return true;
     }
     try {
-      device?.unregister();
+      final promise = device!.unregister();
+      await js_util.promiseToFuture(promise);
       _detachDeviceListeners(device!);
       _clearCalls();
       return true;
@@ -382,10 +383,11 @@ class TwilioVoiceWeb extends MethodChannelTwilioVoice {
       /// create new Twilio device
       device = twilio_js.Device(accessToken, options);
       _call.device = device;
-      _attachDeviceListeners(device!);
+        _attachDeviceListeners(device!);
 
-      // Register device to accept notifications
-      device!.register();
+        // Register device to accept notifications
+        final promise = device!.register();
+        await js_util.promiseToFuture(promise);
       }
 
       return true;