nnbd - fix

Author: vasilich6107

lib/client.dart

@@ -46,7 +46,7 @@ class ArtemisClient {
   ) async {
     final request = Request(
       operation: Operation(
-        document: query.document!,
+        document: query.document,
         operationName: query.operationName,
       ),
       variables: query.getVariablesMap(),
@@ -55,7 +55,7 @@ class ArtemisClient {
     final response = await _link.request(request).first;
 
     return GraphQLResponse<T>(
-      data: response.data == null ? null : query.parse(response.data),
+      data: response.data == null ? null : query.parse(response.data ?? {}),
       errors: response.errors,
     );
   }
@@ -66,14 +66,14 @@ class ArtemisClient {
   ) {
     final request = Request(
       operation: Operation(
-        document: query.document!,
+        document: query.document,
         operationName: query.operationName,
       ),
       variables: query.getVariablesMap(),
     );
 
     return _link.request(request).map((response) => GraphQLResponse<T>(
-          data: response.data == null ? null : query.parse(response.data),
+          data: response.data == null ? null : query.parse(response.data ?? {}),
           errors: response.errors,
         ));
   }

lib/schema/graphql_query.dart

@@ -12,13 +12,13 @@ abstract class GraphQLQuery<T, U extends JsonSerializable> extends Equatable {
   final U? variables;
 
   /// AST representation of the document to be executed.
-  final DocumentNode? document = null;
+  late final DocumentNode document;
 
   /// Operation name used for this query/mutation.
   final String? operationName = null;
 
   /// Parses a JSON map into the response type.
-  T parse(Map<String, dynamic>? json);
+  T parse(Map<String, dynamic> json);
 
   /// Get variables as a JSON map.
   Map<String, dynamic> getVariablesMap() => variables?.toJson() ?? {};