migrate to nnbd

Signed-off-by: Sahil Kumar <[email protected]>

packages/stream_chat_persistence/lib/src/entity/channels.dart

@@ -15,7 +15,7 @@ class Channels extends Table {
   TextColumn get cid => text()();
 
   /// The channel configuration data
-  TextColumn get config => text().map(MapConverter<Object>())();
+  TextColumn get config => text().map(MapConverter())();
 
   /// True if this channel entity is frozen
   BoolColumn get frozen => boolean().withDefault(const Constant(false))();

packages/stream_chat_persistence/lib/src/entity/connection_events.dart

@@ -9,7 +9,7 @@ class ConnectionEvents extends Table {
   IntColumn get id => integer()();
 
   /// User object of the current user
-  TextColumn get ownUser => text().nullable().map(MapConverter<Object>())();
+  TextColumn get ownUser => text().nullable().map(MapConverter())();
 
   /// The number of unread messages for current user
   IntColumn get totalUnreadCount => integer().nullable()();

packages/stream_chat_persistence/lib/src/entity/users.dart

@@ -27,7 +27,7 @@ class Users extends Table {
   BoolColumn get banned => boolean().withDefault(const Constant(false))();
 
   /// Map of custom user extraData
-  TextColumn get extraData => text().nullable().map(MapConverter<Object>())();
+  TextColumn get extraData => text().map(MapConverter<Object>())();
 
   @override
   Set<Column> get primaryKey => {id};