fix(dart_frog): Response json() return Object? (#145)

Author: felangel

packages/dart_frog/lib/src/response.dart

@@ -62,10 +62,10 @@ class Response {
   /// Returns a Future containing the body as a string.
   Future<String> body() => _response.readAsString();
 
-  /// The body as json (`Map<String, dynamic>`).
-  Future<Map<String, dynamic>> json() async {
-    return jsonDecode(await _response.readAsString()) as Map<String, dynamic>;
-  }
+  /// The body as a json object.
+  /// This object could be anything that can be represented by json
+  /// e.g. a map, a list, a string, a number, a bool...
+  Future<Object?> json() async => jsonDecode(await _response.readAsString());
 
   /// Creates a new [Response] by copying existing values and applying specified
   /// changes.

packages/dart_frog/test/src/response_test.dart

@@ -54,11 +54,35 @@ void main() {
     });
 
     group('json', () {
-      test('has correct body', () {
+      test('has correct body (map)', () {
         final body = <String, dynamic>{'foo': 'bar'};
         final response = Response.json(body: body);
         expect(response.json(), completion(equals(body)));
       });
+
+      test('has correct body (list)', () {
+        final body = <String>['foo', 'bar'];
+        final response = Response.json(body: body);
+        expect(response.json(), completion(equals(body)));
+      });
+
+      test('has correct body (string)', () {
+        const body = 'foo';
+        final response = Response.json(body: body);
+        expect(response.json(), completion(equals(body)));
+      });
+
+      test('has correct body (number)', () {
+        const body = 42.0;
+        final response = Response.json(body: body);
+        expect(response.json(), completion(equals(body)));
+      });
+
+      test('has correct body (bool)', () {
+        const body = false;
+        final response = Response.json(body: body);
+        expect(response.json(), completion(equals(body)));
+      });
     });
   });
 }