Merge pull request #2456 from shawon1fb/debouncer_null_safe

Debouncer null safe

@@ -7,7 +7,9 @@ import '../status/http_status.dart';
 
 class GraphQLResponse<T> extends Response<T> {
   final List<GraphQLError>? graphQLErrors;
+
   GraphQLResponse({T? body, this.graphQLErrors}) : super(body: body);
+
   GraphQLResponse.fromResponse(Response res)
       : graphQLErrors = null,
         super(
@@ -31,6 +33,26 @@ class Response<T> {
     this.body,
   });
 
+  Response<T> copyWith({
+    Request? request,
+    int? statusCode,
+    Stream<List<int>>? bodyBytes,
+    String? bodyString,
+    String? statusText,
+    Map<String, String>? headers,
+    T? body,
+  }) {
+    return Response<T>(
+      request: request ?? this.request,
+      statusCode: statusCode ?? this.statusCode,
+      bodyBytes: bodyBytes ?? this.bodyBytes,
+      bodyString: bodyString ?? this.bodyString,
+      statusText: statusText ?? this.statusText,
+      headers: headers ?? this.headers,
+      body: body ?? this.body,
+    );
+  }
+
   /// The Http [Request] linked with this [Response].
   final Request? request;
 

@@ -9,14 +9,14 @@ import 'dart:async';
 /// delayed( () => print( 'called after 1 sec' ));
 /// ```
 class Debouncer {
-  final Duration? delay;
+  final Duration delay;
   Timer? _timer;
 
-  Debouncer({this.delay});
+  Debouncer({required this.delay});
 
   void call(void Function() action) {
     _timer?.cancel();
-    _timer = Timer(delay!, action);
+    _timer = Timer(delay, action);
   }
 
   /// Notifies if the delayed call is active.