add deprecated warnings

lib/index.d.ts

@@ -264,12 +264,25 @@ declare namespace Realm.Sync {
         readonly server: string;
         readonly token: string;
         static adminUser(adminToken: string, server?: string): User;
-        static login(server: string, username: string, password: string): Promise<Realm.Sync.User>;
+              
+        /**
+         * @deprecated, to be removed in future versions
+         */
         static login(server: string, username: string, password: string, callback: (error: any, user: User) => void): void;
-        static register(server: string, username: string, password: string): Promise<Realm.Sync.User>;
+        static login(server: string, username: string, password: string): Promise<Realm.Sync.User>;
+       
+        /**
+         * @deprecated, to be removed in future versions
+         */        
         static register(server: string, username: string, password: string, callback: (error: any, user: User) => void): void;
-        static registerWithProvider(server: string, options: { provider: string, providerToken: string, userInfo: any }): Promise<Realm.Sync.User>;
+        static register(server: string, username: string, password: string): Promise<Realm.Sync.User>;
+        
+        /**
+         * @deprecated, to be removed in versions
+         */        
         static registerWithProvider(server: string, options: { provider: string, providerToken: string, userInfo: any }, callback: (error: Error | null, user: User | null) => void): void;
+        static registerWithProvider(server: string, options: { provider: string, providerToken: string, userInfo: any }): Promise<Realm.Sync.User>;
+        
         logout(): void;
         openManagementRealm(): Realm;
         retrieveAccount(provider: string, username: string): Promise<Account>;
@@ -377,6 +390,7 @@ declare namespace Realm.Sync {
     function removeListener(regex: string, name: string, changeCallback: (changeEvent: ChangeEvent) => void): void;
     function setLogLevel(logLevel: 'all' | 'trace' | 'debug' | 'detail' | 'info' | 'warn' | 'error' | 'fatal' | 'off'): void;
     function setFeatureToken(token: string): void;
+    
     /**
      * @deprecated, to be removed in 2.0
      */

lib/user-methods.js

@@ -189,6 +189,10 @@ const staticMethods = {
                 data: username
             };
            
+            if (callback) {
+                const message = "register(..., callback) is now deprecated in favor of register(): Promise<User>. This function argument will be removed in future versions.";
+                (console.warn || console.log).call(console, message);
+            }
             _authenticate(this, server, json, callback);
             
         },
@@ -201,6 +205,10 @@ const staticMethods = {
                 data: username
             };
             
+            if (callback) {
+                const message = "login(..., callback) is now deprecated in favor of login(): Promise<User>. This function argument will be removed in future versions.";
+                (console.warn || console.log).call(console, message);
+            }
             _authenticate(this, server, json, callback);
         },
 
@@ -228,6 +236,10 @@ const staticMethods = {
                 json.user_info = options.userInfo;
             }
 
+            if (callback) {
+                const message = "registerWithProvider(..., callback) is now deprecated in favor of registerWithProvider(): Promise<User>. This function argument will be removed in future versions.";
+                (console.warn || console.log).call(console, message);
+            }
             _authenticate(this, server, json, callback);
         },