Ignore magic numbers in widget parameters

lib/lints/no_magic_number/no_magic_number_rule.dart

@@ -22,7 +22,9 @@
 // SOFTWARE.
 
 import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/error/listener.dart';
+import 'package:collection/collection.dart';
 import 'package:custom_lint_builder/custom_lint_builder.dart';
 import 'package:solid_lints/lints/no_magic_number/models/no_magic_number_parameters.dart';
 import 'package:solid_lints/lints/no_magic_number/no_magic_number_visitor.dart';
@@ -71,7 +73,8 @@ class NoMagicNumberRule extends SolidLintRule<NoMagicNumberParameters> {
           .where(_isNotInsideIndexExpression)
           .where(_isNotInsideEnumConstantArguments)
           .where(_isNotDefaultValue)
-          .where(_isNotInConstructorInitializer);
+          .where(_isNotInConstructorInitializer)
+          .where(_isNotWidgetParameter);
 
       for (final magicNumber in magicNumbers) {
         reporter.reportErrorForNode(code, magicNumber);
@@ -132,4 +135,22 @@ class NoMagicNumberRule extends SolidLintRule<NoMagicNumberParameters> {
   bool _isNotInConstructorInitializer(Literal literal) {
     return literal.thisOrAncestorOfType<ConstructorInitializer>() == null;
   }
+
+  bool _isNotWidgetParameter(Literal literal) {
+    final instanceCreationExpression =
+        literal.thisOrAncestorOfType<InstanceCreationExpression>();
+
+    if (instanceCreationExpression == null) return true;
+
+    final staticType = instanceCreationExpression.staticType;
+
+    if (staticType is! InterfaceType) return true;
+
+    final widgetSupertype = staticType.allSupertypes.firstWhereOrNull(
+      (supertype) =>
+          supertype.getDisplayString(withNullability: false) == 'Widget',
+    );
+
+    return widgetSupertype == null;
+  }
 }

lint_test/no_magic_number_test.dart

@@ -86,3 +86,18 @@ class ConstructorInitializer {
 
   ConstructorInitializer() : value = 10;
 }
+
+// Allowed for numbers in a Widget subtype parameters.
+abstract interface class Widget {}
+
+class StatelessWidget implements Widget {}
+
+class MyWidget extends StatelessWidget {
+  final int size;
+
+  MyWidget({required this.size});
+}
+
+Widget build() {
+  return MyWidget(size: 12);
+}