Make jwt token optional

Author: jennantilla

ios/RCTOneSignal/RCTOneSignalEventEmitter.m

@@ -106,6 +106,11 @@ + (void)sendEventWithName:(NSString *)name withBody:(NSDictionary *)body {
 }
 
 RCT_EXPORT_METHOD(login:(NSString *)externalId jwtToken:(NSString *)jwtToken) {
+    // Pass nil if jwtToken is not provided
+    if (jwtToken == (id)[NSNull null]) {
+        jwtToken = nil;
+    }
+    
     [OneSignal login:externalId withToken:jwtToken];
 }
 

src/index.ts

@@ -104,10 +104,10 @@ export namespace OneSignal {
    * If your integration is user-centric, or you want the ability to identify the user beyond the current device, the
    * login method should be called to identify the user.
    */
-  export function login(externalId: string, jwtToken: string) {
+  export function login(externalId: string, jwtToken?: string) {
     if (!isNativeModuleLoaded(RNOneSignal)) return;
 
-    RNOneSignal.login(externalId, jwtToken);
+    RNOneSignal.login(externalId, jwtToken || null);
   }
 
   /**