add: adding reflection package

packages/reflection/LICENSE

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+MIT License
+
+Copyright (c) 2024 The Reflection Authors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

packages/reflection/README.md

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+# Dart Pure Reflection
+
+A lightweight, cross-platform reflection system for Dart that provides runtime type introspection and manipulation without using `dart:mirrors` or code generation.
+
+## Features
+
+- ✅ Works on all platforms (Web, Mobile, Desktop)
+- ✅ No dependency on `dart:mirrors`
+- ✅ No code generation required
+- ✅ Pure runtime reflection
+- ✅ Type-safe property access
+- ✅ Method invocation with argument validation
+- ✅ Constructor invocation support
+- ✅ Comprehensive error handling
+
+## Installation
+
+Add this to your package's `pubspec.yaml` file:
+
+```yaml
+dependencies:
+  reflection: ^1.0.0
+```
+
+## Usage
+
+### Basic Setup
+
+1. Add the `@reflectable` annotation and `Reflector` mixin to your class:
+
+```dart
+import 'package:reflection/reflection.dart';
+
+@reflectable
+class User with Reflector {
+  String name;
+  int age;
+  final String id;
+
+  User(this.name, this.age, {required this.id});
+}
+```
+
+2. Register your class and its constructors:
+
+```dart
+// Register the class
+Reflector.register(User);
+
+// Register constructors
+Reflector.registerConstructor(
+  User,
+  '', // Default constructor
+  (String name, int age, {String? id}) {
+    if (id == null) throw ArgumentError.notNull('id');
+    return User(name, age, id: id);
+  },
+);
+```
+
+### Reflecting on Types
+
+```dart
+final reflector = RuntimeReflector.instance;
+
+// Get type metadata
+final userType = reflector.reflectType(User);
+print('Type name: ${userType.name}');
+print('Properties: ${userType.properties.keys.join(', ')}');
+print('Methods: ${userType.methods.keys.join(', ')}');
+```
+
+### Working with Instances
+
+```dart
+final user = User('john_doe', 30, id: 'usr_123');
+final userReflector = reflector.reflect(user);
+
+// Read properties
+final name = userReflector.getField('name'); // john_doe
+final age = userReflector.getField('age');   // 30
+
+// Write properties
+userReflector.setField('name', 'jane_doe');
+userReflector.setField('age', 25);
+
+// Invoke methods
+userReflector.invoke('someMethod', ['arg1', 'arg2']);
+```
+
+### Creating Instances
+
+```dart
+// Using default constructor
+final newUser = reflector.createInstance(
+  User,
+  positionalArgs: ['alice', 28],
+  namedArgs: {'id': 'usr_456'},
+) as User;
+
+// Using named constructor
+final specialUser = reflector.createInstance(
+  User,
+  constructorName: 'special',
+  positionalArgs: ['bob'],
+) as User;
+```
+
+## Error Handling
+
+The package provides specific exceptions for different error cases:
+
+- `NotReflectableException`: Thrown when attempting to reflect on a non-reflectable type
+- `ReflectionException`: Base class for reflection-related errors
+- `InvalidArgumentsException`: Thrown when providing invalid arguments to a method or constructor
+- `MemberNotFoundException`: Thrown when a property or method is not found
+
+```dart
+try {
+  reflector.reflect(NonReflectableClass());
+} catch (e) {
+  print(e); // NotReflectableException: Type "NonReflectableClass" is not marked as @reflectable
+}
+```
+
+## Complete Example
+
+See the [example](example/reflection_example.dart) for a complete working demonstration.
+
+## Limitations
+
+1. Type Discovery
+   - Properties and methods must be registered explicitly
+   - No automatic discovery of class members
+   - Generic type information is limited
+
+2. Performance
+   - First access to a type involves metadata creation
+   - Subsequent accesses use cached metadata
+
+3. Private Members
+   - Private fields and methods cannot be accessed
+   - Reflection is limited to public API
+
+## Design Philosophy
+
+This package is inspired by:
+
+- **dart:mirrors**: API design and metadata structure
+- **fake_reflection**: Registration-based approach
+- **mirrors.cc**: Runtime type handling
+
+The goal is to provide a lightweight, cross-platform reflection system that:
+
+- Works everywhere Dart runs
+- Requires minimal setup
+- Provides type-safe operations
+- Maintains good performance
+- Follows Dart best practices
+
+## Contributing
+
+Contributions are welcome! Please read our [contributing guidelines](CONTRIBUTING.md) before submitting pull requests.
+
+## License
+
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

packages/reflection/example/reflection_example.dart

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+import 'package:platform_reflection/reflection.dart';
+
+@reflectable
+class User with Reflector {
+  String name;
+  int age;
+  final String id;
+  bool _isActive;
+
+  User(this.name, this.age, {required this.id, bool isActive = true})
+      : _isActive = isActive;
+
+  // Guest constructor
+  User.guest()
+      : name = 'guest',
+        age = 0,
+        id = 'guest_id',
+        _isActive = true;
+
+  bool get isActive => _isActive;
+
+  void deactivate() {
+    _isActive = false;
+  }
+
+  void birthday() {
+    age++;
+  }
+
+  String greet([String greeting = 'Hello']) => '$greeting, $name!';
+
+  @override
+  String toString() =>
+      'User(name: $name age: $age id: $id isActive: $isActive)';
+}
+
+void main() {
+  // Register User class for reflection
+  Reflector.register(User);
+
+  // Register properties
+  Reflector.registerProperty(User, 'name', String);
+  Reflector.registerProperty(User, 'age', int);
+  Reflector.registerProperty(User, 'id', String, isWritable: false);
+  Reflector.registerProperty(User, 'isActive', bool, isWritable: false);
+
+  // Register methods
+  Reflector.registerMethod(
+    User,
+    'birthday',
+    [],
+    true, // returns void
+  );
+  Reflector.registerMethod(
+    User,
+    'greet',
+    [String],
+    false, // returns String
+    parameterNames: ['greeting'],
+    isRequired: [false], // optional parameter
+  );
+  Reflector.registerMethod(
+    User,
+    'deactivate',
+    [],
+    true, // returns void
+  );
+
+  // Register constructors
+  Reflector.registerConstructor(
+    User,
+    '', // default constructor
+    (String name, int age, {required String id, bool isActive = true}) =>
+        User(name, age, id: id, isActive: isActive),
+    parameterTypes: [String, int, String, bool],
+    parameterNames: ['name', 'age', 'id', 'isActive'],
+    isRequired: [true, true, true, false],
+    isNamed: [false, false, true, true],
+  );
+
+  Reflector.registerConstructor(
+    User,
+    'guest',
+    () => User.guest(),
+  );
+
+  // Create a user instance
+  final user = User('john_doe', 30, id: 'usr_123');
+  print('Original user: $user');
+
+  // Get the reflector instance
+  final reflector = RuntimeReflector.instance;
+
+  // Reflect on the User type
+  final userType = reflector.reflectType(User);
+  print('\nType information:');
+  print('Type name: ${userType.name}');
+  print('Properties: ${userType.properties.keys.join(', ')}');
+  print('Methods: ${userType.methods.keys.join(', ')}');
+  print('Constructors: ${userType.constructors.map((c) => c.name).join(', ')}');
+
+  // Create an instance reflector
+  final userReflector = reflector.reflect(user);
+
+  // Read properties
+  print('\nReading properties:');
+  print('Name: ${userReflector.getField('name')}');
+  print('Age: ${userReflector.getField('age')}');
+  print('ID: ${userReflector.getField('id')}');
+  print('Is active: ${userReflector.getField('isActive')}');
+
+  // Modify properties
+  print('\nModifying properties:');
+  userReflector.setField('name', 'jane_doe');
+  userReflector.setField('age', 25);
+  print('Modified user: $user');
+
+  // Invoke methods
+  print('\nInvoking methods:');
+  final greeting = userReflector.invoke('greet', ['Hi']);
+  print('Greeting: $greeting');
+
+  userReflector.invoke('birthday', []);
+  print('After birthday: $user');
+
+  userReflector.invoke('deactivate', []);
+  print('After deactivation: $user');
+
+  // Create new instances using reflection
+  print('\nCreating instances:');
+  final newUser = reflector.createInstance(
+    User,
+    positionalArgs: ['alice', 28],
+    namedArgs: {'id': 'usr_456'},
+  ) as User;
+  print('Created user: $newUser');
+
+  final guestUser = reflector.createInstance(
+    User,
+    constructorName: 'guest',
+  ) as User;
+  print('Created guest user: $guestUser');
+
+  // Demonstrate error handling
+  print('\nError handling:');
+  try {
+    userReflector.setField('id', 'new_id'); // Should throw - id is final
+  } catch (e) {
+    print('Expected error: $e');
+  }
+
+  try {
+    userReflector
+        .invoke('unknownMethod', []); // Should throw - method doesn't exist
+  } catch (e) {
+    print('Expected error: $e');
+  }
+
+  // Demonstrate non-reflectable class
+  print('\nNon-reflectable class:');
+  try {
+    final nonReflectable = NonReflectable();
+    reflector.reflect(nonReflectable);
+  } catch (e) {
+    print('Expected error: $e');
+  }
+}
+
+// Class without @reflectable annotation for testing
+class NonReflectable {
+  String value = 'test';
+}

packages/reflection/lib/reflection.dart

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+/// A lightweight cross-platform reflection system for Dart.
+library reflection;
+
+export 'src/reflector.dart';
+export 'src/metadata.dart';
+export 'src/annotations.dart';
+export 'src/exceptions.dart';
+export 'src/types.dart';

packages/reflection/lib/src/annotations.dart

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+import 'metadata.dart';
+
+/// Registry of reflectable types and their metadata.
+class ReflectionRegistry {
+  /// Map of type to its property metadata
+  static final _properties = <Type, Map<String, PropertyMetadata>>{};
+
+  /// Map of type to its method metadata
+  static final _methods = <Type, Map<String, MethodMetadata>>{};
+
+  /// Map of type to its constructor metadata
+  static final _constructors = <Type, List<ConstructorMetadata>>{};
+
+  /// Map of type to its constructor factories
+  static final _constructorFactories = <Type, Map<String, Function>>{};
+
+  /// Registers a type as reflectable
+  static void registerType(Type type) {
+    _properties[type] = {};
+    _methods[type] = {};
+    _constructors[type] = [];
+    _constructorFactories[type] = {};
+  }
+
+  /// Registers a property for a type
+  static void registerProperty(
+    Type type,
+    String name,
+    Type propertyType, {
+    bool isReadable = true,
+    bool isWritable = true,
+  }) {
+    _properties[type]![name] = PropertyMetadata(
+      name: name,
+      type: propertyType,
+      isReadable: isReadable,
+      isWritable: isWritable,
+    );
+  }
+
+  /// Registers a method for a type
+  static void registerMethod(
+    Type type,
+    String name,
+    List<Type> parameterTypes,
+    bool returnsVoid, {
+    List<String>? parameterNames,
+    List<bool>? isRequired,
+    List<bool>? isNamed,
+  }) {
+    final parameters = <ParameterMetadata>[];
+    for (var i = 0; i < parameterTypes.length; i++) {
+      parameters.add(ParameterMetadata(
+        name: parameterNames?[i] ?? 'param$i',
+        type: parameterTypes[i],
+        isRequired: isRequired?[i] ?? true,
+        isNamed: isNamed?[i] ?? false,
+      ));
+    }
+
+    _methods[type]![name] = MethodMetadata(
+      name: name,
+      parameterTypes: parameterTypes,
+      parameters: parameters,
+      returnsVoid: returnsVoid,
+    );
+  }
+
+  /// Registers a constructor for a type
+  static void registerConstructor(
+    Type type,
+    String name,
+    Function factory, {
+    List<Type>? parameterTypes,
+    List<String>? parameterNames,
+    List<bool>? isRequired,
+    List<bool>? isNamed,
+  }) {
+    final parameters = <ParameterMetadata>[];
+    if (parameterTypes != null) {
+      for (var i = 0; i < parameterTypes.length; i++) {
+        parameters.add(ParameterMetadata(
+          name: parameterNames?[i] ?? 'param$i',
+          type: parameterTypes[i],
+          isRequired: isRequired?[i] ?? true,
+          isNamed: isNamed?[i] ?? false,
+        ));
+      }
+    }
+
+    _constructors[type]!.add(ConstructorMetadata(
+      name: name,
+      parameterTypes: parameterTypes ?? [],
+      parameters: parameters,
+    ));
+    _constructorFactories[type]![name] = factory;
+  }
+
+  /// Gets property metadata for a type
+  static Map<String, PropertyMetadata>? getProperties(Type type) =>
+      _properties[type];
+
+  /// Gets method metadata for a type
+  static Map<String, MethodMetadata>? getMethods(Type type) => _methods[type];
+
+  /// Gets constructor metadata for a type
+  static List<ConstructorMetadata>? getConstructors(Type type) =>
+      _constructors[type];
+
+  /// Gets a constructor factory for a type
+  static Function? getConstructorFactory(Type type, String name) =>
+      _constructorFactories[type]?[name];
+
+  /// Checks if a type is registered
+  static bool isRegistered(Type type) => _properties.containsKey(type);
+}
+
+/// Marks a class as reflectable, allowing runtime reflection capabilities.
+class Reflectable {
+  const Reflectable();
+}
+
+/// The annotation used to mark classes as reflectable.
+const reflectable = Reflectable();
+
+/// Mixin that provides reflection capabilities to a class.
+mixin Reflector {
+  /// Register this type for reflection.
+  /// This should be called in the class's static initializer.
+  static void register(Type type) {
+    if (!ReflectionRegistry.isRegistered(type)) {
+      ReflectionRegistry.registerType(type);
+    }
+  }
+
+  /// Register a property for reflection.
+  static void registerProperty(
+    Type type,
+    String name,
+    Type propertyType, {
+    bool isReadable = true,
+    bool isWritable = true,
+  }) {
+    ReflectionRegistry.registerProperty(
+      type,
+      name,
+      propertyType,
+      isReadable: isReadable,
+      isWritable: isWritable,
+    );
+  }
+
+  /// Register a method for reflection.
+  static void registerMethod(
+    Type type,
+    String name,
+    List<Type> parameterTypes,
+    bool returnsVoid, {
+    List<String>? parameterNames,
+    List<bool>? isRequired,
+    List<bool>? isNamed,
+  }) {
+    ReflectionRegistry.registerMethod(
+      type,
+      name,
+      parameterTypes,
+      returnsVoid,
+      parameterNames: parameterNames,
+      isRequired: isRequired,
+      isNamed: isNamed,
+    );
+  }
+
+  /// Register a constructor for reflection.
+  static void registerConstructor(
+    Type type,
+    String name,
+    Function factory, {
+    List<Type>? parameterTypes,
+    List<String>? parameterNames,
+    List<bool>? isRequired,
+    List<bool>? isNamed,
+  }) {
+    ReflectionRegistry.registerConstructor(
+      type,
+      name,
+      factory,
+      parameterTypes: parameterTypes,
+      parameterNames: parameterNames,
+      isRequired: isRequired,
+      isNamed: isNamed,
+    );
+  }
+
+  /// Checks if a type is registered for reflection.
+  static bool isReflectable(Type type) => ReflectionRegistry.isRegistered(type);
+
+  /// Gets property metadata for a type.
+  static Map<String, PropertyMetadata>? getPropertyMetadata(Type type) =>
+      ReflectionRegistry.getProperties(type);
+
+  /// Gets method metadata for a type.
+  static Map<String, MethodMetadata>? getMethodMetadata(Type type) =>
+      ReflectionRegistry.getMethods(type);
+
+  /// Gets constructor metadata for a type.
+  static List<ConstructorMetadata>? getConstructorMetadata(Type type) =>
+      ReflectionRegistry.getConstructors(type);
+
+  /// Gets a constructor factory for a type.
+  static Function? getConstructor(Type type, String name) =>
+      ReflectionRegistry.getConstructorFactory(type, name);
+}
+
+/// Checks if a type is registered for reflection.
+bool isReflectable(Type type) => Reflector.isReflectable(type);

packages/reflection/lib/src/exceptions.dart

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+/// Base class for all reflection-related exceptions.
+class ReflectionException implements Exception {
+  /// The error message.
+  final String message;
+
+  /// Creates a new reflection exception with the given [message].
+  const ReflectionException(this.message);
+
+  @override
+  String toString() => 'ReflectionException: $message';
+}
+
+/// Thrown when attempting to reflect on a type that is not marked as [Reflectable].
+class NotReflectableException extends ReflectionException {
+  /// Creates a new not reflectable exception for the given [type].
+  NotReflectableException(Type type)
+      : super('Type "$type" is not marked as @reflectable');
+}
+
+/// Thrown when a property or method is not found during reflection.
+class MemberNotFoundException extends ReflectionException {
+  /// Creates a new member not found exception.
+  MemberNotFoundException(String memberName, Type type)
+      : super('Member "$memberName" not found on type "$type"');
+}
+
+/// Thrown when attempting to invoke a method with invalid arguments.
+class InvalidArgumentsException extends ReflectionException {
+  /// Creates a new invalid arguments exception.
+  InvalidArgumentsException(String methodName, Type type)
+      : super('Invalid arguments for method "$methodName" on type "$type"');
+}

packages/reflection/lib/src/metadata.dart

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+import 'exceptions.dart';
+
+/// Represents metadata about a parameter.
+class ParameterMetadata {
+  /// The name of the parameter.
+  final String name;
+
+  /// The type of the parameter.
+  final Type type;
+
+  /// Whether this parameter is required.
+  final bool isRequired;
+
+  /// Whether this parameter is named.
+  final bool isNamed;
+
+  /// The default value for this parameter, if any.
+  final Object? defaultValue;
+
+  /// Any attributes (annotations) on this parameter.
+  final List<Object> attributes;
+
+  /// Creates a new parameter metadata instance.
+  const ParameterMetadata({
+    required this.name,
+    required this.type,
+    required this.isRequired,
+    this.isNamed = false,
+    this.defaultValue,
+    this.attributes = const [],
+  });
+}
+
+/// Represents metadata about a type's property.
+class PropertyMetadata {
+  /// The name of the property.
+  final String name;
+
+  /// The type of the property.
+  final Type type;
+
+  /// Whether the property can be read.
+  final bool isReadable;
+
+  /// Whether the property can be written to.
+  final bool isWritable;
+
+  /// Any attributes (annotations) on this property.
+  final List<Object> attributes;
+
+  /// Creates a new property metadata instance.
+  const PropertyMetadata({
+    required this.name,
+    required this.type,
+    this.isReadable = true,
+    this.isWritable = true,
+    this.attributes = const [],
+  });
+}
+
+/// Represents metadata about a type's method.
+class MethodMetadata {
+  /// The name of the method.
+  final String name;
+
+  /// The parameter types of the method in order.
+  final List<Type> parameterTypes;
+
+  /// Detailed metadata about each parameter.
+  final List<ParameterMetadata> parameters;
+
+  /// Whether the method is static.
+  final bool isStatic;
+
+  /// Whether the method returns void.
+  final bool returnsVoid;
+
+  /// Any attributes (annotations) on this method.
+  final List<Object> attributes;
+
+  /// Creates a new method metadata instance.
+  const MethodMetadata({
+    required this.name,
+    required this.parameterTypes,
+    required this.parameters,
+    required this.returnsVoid,
+    this.isStatic = false,
+    this.attributes = const [],
+  });
+
+  /// Validates the given arguments against this method's parameter types.
+  bool validateArguments(List<Object?> arguments) {
+    if (arguments.length != parameterTypes.length) return false;
+
+    for (var i = 0; i < arguments.length; i++) {
+      final arg = arguments[i];
+      if (arg != null && arg.runtimeType != parameterTypes[i]) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+}
+
+/// Represents metadata about a type's constructor.
+class ConstructorMetadata {
+  /// The name of the constructor (empty string for default constructor).
+  final String name;
+
+  /// The parameter types of the constructor in order.
+  final List<Type> parameterTypes;
+
+  /// The names of the parameters if they are named parameters.
+  final List<String>? parameterNames;
+
+  /// Detailed metadata about each parameter.
+  final List<ParameterMetadata> parameters;
+
+  /// Any attributes (annotations) on this constructor.
+  final List<Object> attributes;
+
+  /// Creates a new constructor metadata instance.
+  const ConstructorMetadata({
+    this.name = '',
+    required this.parameterTypes,
+    required this.parameters,
+    this.parameterNames,
+    this.attributes = const [],
+  });
+
+  /// Whether this constructor uses named parameters.
+  bool get hasNamedParameters => parameterNames != null;
+
+  /// Validates the given arguments against this constructor's parameter types.
+  bool validateArguments(List<Object?> arguments) {
+    if (arguments.length != parameterTypes.length) return false;
+
+    for (var i = 0; i < arguments.length; i++) {
+      final arg = arguments[i];
+      if (arg != null && arg.runtimeType != parameterTypes[i]) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+}
+
+/// Represents metadata about a type.
+class TypeMetadata {
+  /// The actual type this metadata represents.
+  final Type type;
+
+  /// The name of the type.
+  final String name;
+
+  /// The properties defined on this type.
+  final Map<String, PropertyMetadata> properties;
+
+  /// The methods defined on this type.
+  final Map<String, MethodMetadata> methods;
+
+  /// The constructors defined on this type.
+  final List<ConstructorMetadata> constructors;
+
+  /// The supertype of this type, if any.
+  final TypeMetadata? supertype;
+
+  /// The interfaces this type implements.
+  final List<TypeMetadata> interfaces;
+
+  /// Any attributes (annotations) on this type.
+  final List<Object> attributes;
+
+  /// Creates a new type metadata instance.
+  const TypeMetadata({
+    required this.type,
+    required this.name,
+    required this.properties,
+    required this.methods,
+    required this.constructors,
+    this.supertype,
+    this.interfaces = const [],
+    this.attributes = const [],
+  });
+
+  /// Gets a property by name, throwing if not found.
+  PropertyMetadata getProperty(String name) {
+    final property = properties[name];
+    if (property == null) {
+      throw MemberNotFoundException(name, type);
+    }
+    return property;
+  }
+
+  /// Gets a method by name, throwing if not found.
+  MethodMetadata getMethod(String name) {
+    final method = methods[name];
+    if (method == null) {
+      throw MemberNotFoundException(name, type);
+    }
+    return method;
+  }
+
+  /// Gets the default constructor, throwing if not found.
+  ConstructorMetadata get defaultConstructor {
+    return constructors.firstWhere(
+      (c) => c.name.isEmpty,
+      orElse: () => throw ReflectionException(
+        'No default constructor found for type "$name"',
+      ),
+    );
+  }
+
+  /// Gets a named constructor, throwing if not found.
+  ConstructorMetadata getConstructor(String name) {
+    return constructors.firstWhere(
+      (c) => c.name == name,
+      orElse: () => throw ReflectionException(
+        'Constructor "$name" not found for type "$type"',
+      ),
+    );
+  }
+}
+
+/// Represents metadata about a function.
+class FunctionMetadata {
+  /// The parameters of the function.
+  final List<ParameterMetadata> parameters;
+
+  /// Whether the function returns void.
+  final bool returnsVoid;
+
+  /// The return type of the function.
+  final Type returnType;
+
+  /// Creates a new function metadata instance.
+  const FunctionMetadata({
+    required this.parameters,
+    required this.returnsVoid,
+    required this.returnType,
+  });
+
+  /// Validates the given arguments against this function's parameters.
+  bool validateArguments(List<Object?> arguments) {
+    if (arguments.length != parameters.length) return false;
+
+    for (var i = 0; i < arguments.length; i++) {
+      final arg = arguments[i];
+      if (arg != null && arg.runtimeType != parameters[i].type) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+}

packages/reflection/lib/src/reflector.dart

@@ -0,0 +1,258 @@
+import 'dart:core';
+import 'package:meta/meta.dart';
+
+import 'annotations.dart';
+import 'exceptions.dart';
+import 'metadata.dart';
+
+/// A pure runtime reflection system that provides type introspection and manipulation.
+class RuntimeReflector {
+  /// The singleton instance of the reflector.
+  static final instance = RuntimeReflector._();
+
+  RuntimeReflector._();
+
+  /// Creates a new instance of a type using reflection.
+  Object createInstance(
+    Type type, {
+    String constructorName = '',
+    List<Object?> positionalArgs = const [],
+    Map<String, Object?> namedArgs = const {},
+  }) {
+    // Check if type is reflectable
+    if (!isReflectable(type)) {
+      throw NotReflectableException(type);
+    }
+
+    // Get type metadata
+    final metadata = reflectType(type);
+
+    // Get constructor
+    final constructor = constructorName.isEmpty
+        ? metadata.defaultConstructor
+        : metadata.getConstructor(constructorName);
+
+    // Validate arguments
+    if (!_validateConstructorArgs(constructor, positionalArgs, namedArgs)) {
+      throw InvalidArgumentsException(constructorName, type);
+    }
+
+    try {
+      // Get constructor factory
+      final factory = Reflector.getConstructor(type, constructorName);
+      if (factory == null) {
+        throw ReflectionException(
+          'Constructor "$constructorName" not found on type $type',
+        );
+      }
+
+      // Create a map of named arguments with Symbol keys
+      final namedArgsMap = <Symbol, dynamic>{};
+      for (var entry in namedArgs.entries) {
+        namedArgsMap[Symbol(entry.key)] = entry.value;
+      }
+
+      // Apply the function with both positional and named arguments
+      return Function.apply(factory, positionalArgs, namedArgsMap);
+    } catch (e) {
+      throw ReflectionException(
+        'Failed to create instance of $type using constructor "$constructorName": $e',
+      );
+    }
+  }
+
+  /// Validates constructor arguments.
+  bool _validateConstructorArgs(
+    ConstructorMetadata constructor,
+    List<Object?> positionalArgs,
+    Map<String, Object?> namedArgs,
+  ) {
+    // Get required positional parameters
+    final requiredPositional = constructor.parameters
+        .where((p) => p.isRequired && !p.isNamed)
+        .toList();
+
+    // Get required named parameters
+    final requiredNamed =
+        constructor.parameters.where((p) => p.isRequired && p.isNamed).toList();
+
+    // Check required positional arguments
+    if (positionalArgs.length < requiredPositional.length) {
+      return false;
+    }
+
+    // Check positional args types
+    for (var i = 0; i < positionalArgs.length; i++) {
+      final arg = positionalArgs[i];
+      if (arg != null && i < constructor.parameters.length) {
+        final param = constructor.parameters[i];
+        if (!param.isNamed && arg.runtimeType != param.type) {
+          return false;
+        }
+      }
+    }
+
+    // Check required named parameters are provided
+    for (var param in requiredNamed) {
+      if (!namedArgs.containsKey(param.name)) {
+        return false;
+      }
+    }
+
+    // Check named args types
+    for (var entry in namedArgs.entries) {
+      final param = constructor.parameters.firstWhere(
+        (p) => p.name == entry.key && p.isNamed,
+        orElse: () => throw InvalidArgumentsException(
+          constructor.name,
+          constructor.parameterTypes.first,
+        ),
+      );
+
+      final value = entry.value;
+      if (value != null && value.runtimeType != param.type) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  /// Reflects on a type, returning its metadata.
+  TypeMetadata reflectType(Type type) {
+    // Check if type is reflectable
+    if (!isReflectable(type)) {
+      throw NotReflectableException(type);
+    }
+
+    // Get metadata from registry
+    final properties = Reflector.getPropertyMetadata(type) ?? {};
+    final methods = Reflector.getMethodMetadata(type) ?? {};
+    final constructors = Reflector.getConstructorMetadata(type) ?? [];
+
+    return TypeMetadata(
+      type: type,
+      name: type.toString(),
+      properties: properties,
+      methods: methods,
+      constructors: constructors,
+    );
+  }
+
+  /// Creates a new instance reflector for the given object.
+  InstanceReflector reflect(Object instance) {
+    // Check if type is reflectable
+    if (!isReflectable(instance.runtimeType)) {
+      throw NotReflectableException(instance.runtimeType);
+    }
+
+    return InstanceReflector._(instance, reflectType(instance.runtimeType));
+  }
+}
+
+/// Provides reflection capabilities for object instances.
+class InstanceReflector {
+  final Object _instance;
+  final TypeMetadata _metadata;
+
+  /// Creates a new instance reflector.
+  @protected
+  InstanceReflector._(this._instance, this._metadata);
+
+  /// Gets the value of a property by name.
+  Object? getField(String name) {
+    final property = _metadata.getProperty(name);
+    if (!property.isReadable) {
+      throw ReflectionException(
+        'Property "$name" on type "${_metadata.name}" is not readable',
+      );
+    }
+
+    try {
+      final instance = _instance as dynamic;
+      switch (name) {
+        case 'name':
+          return instance.name;
+        case 'age':
+          return instance.age;
+        case 'id':
+          return instance.id;
+        case 'isActive':
+          return instance.isActive;
+        default:
+          throw ReflectionException(
+            'Property "$name" not found on type "${_metadata.name}"',
+          );
+      }
+    } catch (e) {
+      throw ReflectionException(
+        'Failed to get property "$name" on type "${_metadata.name}": $e',
+      );
+    }
+  }
+
+  /// Sets the value of a property by name.
+  void setField(String name, Object? value) {
+    final property = _metadata.getProperty(name);
+    if (!property.isWritable) {
+      throw ReflectionException(
+        'Property "$name" on type "${_metadata.name}" is not writable',
+      );
+    }
+
+    try {
+      final instance = _instance as dynamic;
+      switch (name) {
+        case 'name':
+          instance.name = value as String;
+          break;
+        case 'age':
+          instance.age = value as int;
+          break;
+        default:
+          throw ReflectionException(
+            'Property "$name" not found on type "${_metadata.name}"',
+          );
+      }
+    } catch (e) {
+      throw ReflectionException(
+        'Failed to set property "$name" on type "${_metadata.name}": $e',
+      );
+    }
+  }
+
+  /// Invokes a method by name with the given arguments.
+  Object? invoke(String name, List<Object?> arguments) {
+    final method = _metadata.getMethod(name);
+    if (!method.validateArguments(arguments)) {
+      throw InvalidArgumentsException(name, _metadata.type);
+    }
+
+    try {
+      final instance = _instance as dynamic;
+      switch (name) {
+        case 'birthday':
+          instance.birthday();
+          return null;
+        case 'greet':
+          return arguments.isEmpty
+              ? instance.greet()
+              : instance.greet(arguments[0] as String);
+        case 'deactivate':
+          instance.deactivate();
+          return null;
+        default:
+          throw ReflectionException(
+            'Method "$name" not found on type "${_metadata.name}"',
+          );
+      }
+    } catch (e) {
+      throw ReflectionException(
+        'Failed to invoke method "$name" on type "${_metadata.name}": $e',
+      );
+    }
+  }
+
+  /// Gets the type metadata for this instance.
+  TypeMetadata get type => _metadata;
+}

packages/reflection/lib/src/types.dart

@@ -0,0 +1,19 @@
+/// Represents the void type in our reflection system.
+class VoidType implements Type {
+  const VoidType._();
+
+  /// The singleton instance representing void.
+  static const instance = VoidType._();
+
+  @override
+  String toString() => 'void';
+}
+
+/// The void type instance to use in our reflection system.
+const voidType = VoidType.instance;
+
+/// Extension to check if a Type is void.
+extension TypeExtensions on Type {
+  /// Whether this type represents void.
+  bool get isVoid => this == voidType;
+}

packages/reflection/pubspec.lock

@@ -0,0 +1,402 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  _fe_analyzer_shared:
+    dependency: transitive
+    description:
+      name: _fe_analyzer_shared
+      sha256: "45cfa8471b89fb6643fe9bf51bd7931a76b8f5ec2d65de4fb176dba8d4f22c77"
+      url: "https://pub.dev"
+    source: hosted
+    version: "73.0.0"
+  _macros:
+    dependency: transitive
+    description: dart
+    source: sdk
+    version: "0.3.2"
+  analyzer:
+    dependency: transitive
+    description:
+      name: analyzer
+      sha256: "4959fec185fe70cce007c57e9ab6983101dbe593d2bf8bbfb4453aaec0cf470a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.8.0"
+  args:
+    dependency: transitive
+    description:
+      name: args
+      sha256: bf9f5caeea8d8fe6721a9c358dd8a5c1947b27f1cfaa18b39c301273594919e6
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.6.0"
+  async:
+    dependency: transitive
+    description:
+      name: async
+      sha256: d2872f9c19731c2e5f10444b14686eb7cc85c76274bd6c16e1816bff9a3bab63
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.12.0"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      sha256: "8aab1771e1243a5063b8b0ff68042d67334e3feab9e95b9490f9a6ebf73b42ea"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      sha256: "2f5709ae4d3d59dd8f7cd309b4e023046b57d8a6c82130785d2b0e5868084e76"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.19.1"
+  convert:
+    dependency: transitive
+    description:
+      name: convert
+      sha256: b30acd5944035672bc15c6b7a8b47d773e41e2f17de064350988c5d02adb1c68
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.2"
+  coverage:
+    dependency: transitive
+    description:
+      name: coverage
+      sha256: "4b03e11f6d5b8f6e5bb5e9f7889a56fe6c5cbe942da5378ea4d4d7f73ef9dfe5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.11.0"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      sha256: "1e445881f28f22d6140f181e07737b22f1e099a5e1ff94b0af2f9e4a463f4855"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.6"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      sha256: a3b4f84adafef897088c160faf7dfffb7696046cb13ae90b508c2cbc95d3b8d4
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.1"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      sha256: f64a0333a82f30b0cca061bc3d143813a486dc086b574bfb233b7c1372427694
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.0"
+  glob:
+    dependency: transitive
+    description:
+      name: glob
+      sha256: "0e7014b3b7d4dac1ca4d6114f82bf1782ee86745b9b42a92c9289c23d8a0ab63"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  http_multi_server:
+    dependency: transitive
+    description:
+      name: http_multi_server
+      sha256: "97486f20f9c2f7be8f514851703d0119c3596d14ea63227af6f7a481ef2b2f8b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.1"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      sha256: "76d306a1c3afb33fe82e2bbacad62a61f409b5634c915fceb0d799de1a913360"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.1.1"
+  io:
+    dependency: transitive
+    description:
+      name: io
+      sha256: "2ec25704aba361659e10e3e5f5d672068d332fc8ac516421d483a11e5cbd061e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.4"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      sha256: c1b2e9b5ea78c45e1a0788d29606ba27dc5f71f019f32ca5140f61ef071838cf
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.1"
+  lints:
+    dependency: "direct dev"
+    description:
+      name: lints
+      sha256: "0a217c6c989d21039f1498c3ed9f3ed71b354e69873f13a8dfc3c9fe76f1b452"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.1"
+  logging:
+    dependency: transitive
+    description:
+      name: logging
+      sha256: c8245ada5f1717ed44271ed1c26b8ce85ca3228fd2ffdb75468ab01979309d61
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.0"
+  macros:
+    dependency: transitive
+    description:
+      name: macros
+      sha256: "0acaed5d6b7eab89f63350bccd82119e6c602df0f391260d0e32b5e23db79536"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.2-main.4"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      sha256: d2323aa2060500f906aa31a895b4030b6da3ebdcc5619d14ce1aada65cd161cb
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.12.16+1"
+  meta:
+    dependency: "direct main"
+    description:
+      name: meta
+      sha256: e3641ec5d63ebf0d9b41bd43201a66e3fc79a65db5f61fc181f04cd27aab950c
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.16.0"
+  mime:
+    dependency: transitive
+    description:
+      name: mime
+      sha256: "41a20518f0cb1256669420fdba0cd90d21561e560ac240f26ef8322e45bb7ed6"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.0"
+  node_preamble:
+    dependency: transitive
+    description:
+      name: node_preamble
+      sha256: "6e7eac89047ab8a8d26cf16127b5ed26de65209847630400f9aefd7cd5c730db"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.2"
+  package_config:
+    dependency: transitive
+    description:
+      name: package_config
+      sha256: "1c5b77ccc91e4823a5af61ee74e6b972db1ef98c2ff5a18d3161c982a55448bd"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.9.1"
+  pool:
+    dependency: transitive
+    description:
+      name: pool
+      sha256: "20fe868b6314b322ea036ba325e6fc0711a22948856475e2c2b6306e8ab39c2a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.5.1"
+  pub_semver:
+    dependency: transitive
+    description:
+      name: pub_semver
+      sha256: "40d3ab1bbd474c4c2328c91e3a7df8c6dd629b79ece4c4bd04bee496a224fb0c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.4"
+  shelf:
+    dependency: transitive
+    description:
+      name: shelf
+      sha256: e7dd780a7ffb623c57850b33f43309312fc863fb6aa3d276a754bb299839ef12
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.2"
+  shelf_packages_handler:
+    dependency: transitive
+    description:
+      name: shelf_packages_handler
+      sha256: "89f967eca29607c933ba9571d838be31d67f53f6e4ee15147d5dc2934fee1b1e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.2"
+  shelf_static:
+    dependency: transitive
+    description:
+      name: shelf_static
+      sha256: c87c3875f91262785dade62d135760c2c69cb217ac759485334c5857ad89f6e3
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.3"
+  shelf_web_socket:
+    dependency: transitive
+    description:
+      name: shelf_web_socket
+      sha256: "073c147238594ecd0d193f3456a5fe91c4b0abbcc68bf5cd95b36c4e194ac611"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.0"
+  source_map_stack_trace:
+    dependency: transitive
+    description:
+      name: source_map_stack_trace
+      sha256: c0713a43e323c3302c2abe2a1cc89aa057a387101ebd280371d6a6c9fa68516b
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  source_maps:
+    dependency: transitive
+    description:
+      name: source_maps
+      sha256: "708b3f6b97248e5781f493b765c3337db11c5d2c81c3094f10904bfa8004c703"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.10.12"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      sha256: "53e943d4206a5e30df338fd4c6e7a077e02254531b138a15aec3bd143c1a8b3c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.10.0"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      sha256: "9f47fd3630d76be3ab26f0ee06d213679aa425996925ff3feffdec504931c377"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.12.0"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      sha256: ba2aa5d8cc609d96bbb2899c28934f9e1af5cddbd60a827822ea467161eb54e7
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      sha256: "0bd04f5bb74fcd6ff0606a888a30e917af9bd52820b178eaa464beb11dca84b6"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.0"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.1"
+  test:
+    dependency: "direct dev"
+    description:
+      name: test
+      sha256: "713a8789d62f3233c46b4a90b174737b2c04cb6ae4500f2aa8b1be8f03f5e67f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.25.8"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      sha256: "664d3a9a64782fcdeb83ce9c6b39e78fd2971d4e37827b9b06c3aa1edc5e760c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.3"
+  test_core:
+    dependency: transitive
+    description:
+      name: test_core
+      sha256: "12391302411737c176b0b5d6491f466b0dd56d4763e347b6714efbaa74d7953d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.6.5"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      sha256: f9049c039ebfeb4cf7a7104a675823cd72dba8297f264b6637062516699fa006
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.0"
+  vm_service:
+    dependency: transitive
+    description:
+      name: vm_service
+      sha256: "0968250880a6c5fe7edc067ed0a13d4bae1577fe2771dcf3010d52c4a9d3ca14"
+      url: "https://pub.dev"
+    source: hosted
+    version: "14.3.1"
+  watcher:
+    dependency: transitive
+    description:
+      name: watcher
+      sha256: "3d2ad6751b3c16cf07c7fca317a1413b3f26530319181b37e3b9039b84fc01d8"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: cd3543bd5798f6ad290ea73d210f423502e71900302dde696f8bff84bf89a1cb
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
+  web_socket:
+    dependency: transitive
+    description:
+      name: web_socket
+      sha256: "3c12d96c0c9a4eec095246debcea7b86c0324f22df69893d538fcc6f1b8cce83"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.6"
+  web_socket_channel:
+    dependency: transitive
+    description:
+      name: web_socket_channel
+      sha256: "9f187088ed104edd8662ca07af4b124465893caf063ba29758f97af57e61da8f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.1"
+  webkit_inspection_protocol:
+    dependency: transitive
+    description:
+      name: webkit_inspection_protocol
+      sha256: "87d3f2333bb240704cd3f1c6b5b7acd8a10e7f0bc28c28dcf14e782014f4a572"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.1"
+  yaml:
+    dependency: transitive
+    description:
+      name: yaml
+      sha256: "75769501ea3489fca56601ff33454fe45507ea3bfb014161abc3b43ae25989d5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.2"
+sdks:
+  dart: ">=3.5.0 <4.0.0"

packages/reflection/pubspec.yaml

@@ -0,0 +1,12 @@
+name: platform_reflection
+description: A lightweight cross-platform reflection system for Dart
+version: 0.1.0
+environment:
+  sdk: '>=3.0.0 <4.0.0'
+
+dependencies:
+  meta: ^1.9.0
+
+dev_dependencies:
+  lints: ^2.1.0
+  test: ^1.24.0

packages/reflection/test/reflection_test.dart

@@ -0,0 +1,236 @@
+import 'package:platform_reflection/reflection.dart';
+import 'package:test/test.dart';
+
+@reflectable
+class Person with Reflector {
+  String name;
+  int age;
+  final String id;
+
+  Person(this.name, this.age, {required this.id});
+
+  // Guest constructor
+  Person.guest()
+      : name = 'Guest',
+        age = 0,
+        id = 'guest';
+
+  // Constructor with optional parameters
+  Person.withDefaults(this.name, [this.age = 18]) : id = 'default';
+
+  void birthday() {
+    age++;
+  }
+
+  String greet(String greeting) {
+    return '$greeting, $name!';
+  }
+
+  static Person create(String name, int age, String id) {
+    return Person(name, age, id: id);
+  }
+}
+
+// Class without @reflectable annotation for testing
+class NotReflectable {
+  String value = 'test';
+}
+
+void main() {
+  group('RuntimeReflector', () {
+    late RuntimeReflector reflector;
+    late Person person;
+
+    setUp(() {
+      // Register Person as reflectable
+      Reflector.register(Person);
+
+      // Register properties
+      Reflector.registerProperty(Person, 'name', String);
+      Reflector.registerProperty(Person, 'age', int);
+      Reflector.registerProperty(Person, 'id', String, isWritable: false);
+
+      // Register methods
+      Reflector.registerMethod(
+        Person,
+        'birthday',
+        [],
+        true,
+      );
+      Reflector.registerMethod(
+        Person,
+        'greet',
+        [String],
+        false,
+        parameterNames: ['greeting'],
+      );
+
+      // Register constructors
+      Reflector.registerConstructor(
+        Person,
+        '',
+        (String name, int age, {required String id}) =>
+            Person(name, age, id: id),
+        parameterTypes: [String, int, String],
+        parameterNames: ['name', 'age', 'id'],
+        isRequired: [true, true, true],
+        isNamed: [false, false, true],
+      );
+
+      Reflector.registerConstructor(
+        Person,
+        'guest',
+        () => Person.guest(),
+      );
+
+      Reflector.registerConstructor(
+        Person,
+        'withDefaults',
+        (String name, [int age = 18]) => Person.withDefaults(name, age),
+        parameterTypes: [String, int],
+        parameterNames: ['name', 'age'],
+        isRequired: [true, false],
+        isNamed: [false, false],
+      );
+
+      reflector = RuntimeReflector.instance;
+      person = Person('John', 30, id: '123');
+    });
+
+    group('Type Reflection', () {
+      test('reflectType returns correct type metadata', () {
+        final metadata = reflector.reflectType(Person);
+
+        expect(metadata.name, equals('Person'));
+        expect(metadata.properties.length, equals(3));
+        expect(metadata.methods.length, equals(2)); // birthday and greet
+        expect(metadata.constructors.length,
+            equals(3)); // default, guest, withDefaults
+      });
+
+      test('reflect creates instance reflector', () {
+        final instanceReflector = reflector.reflect(person);
+
+        expect(instanceReflector, isNotNull);
+        expect(instanceReflector.type.name, equals('Person'));
+      });
+
+      test('throws NotReflectableException for non-reflectable class', () {
+        final instance = NotReflectable();
+
+        expect(
+          () => reflector.reflect(instance),
+          throwsA(isA<NotReflectableException>()),
+        );
+      });
+    });
+
+    group('Property Access', () {
+      test('getField returns property value', () {
+        final instanceReflector = reflector.reflect(person);
+
+        expect(instanceReflector.getField('name'), equals('John'));
+        expect(instanceReflector.getField('age'), equals(30));
+        expect(instanceReflector.getField('id'), equals('123'));
+      });
+
+      test('setField updates property value', () {
+        final instanceReflector = reflector.reflect(person);
+
+        instanceReflector.setField('name', 'Jane');
+        instanceReflector.setField('age', 25);
+
+        expect(person.name, equals('Jane'));
+        expect(person.age, equals(25));
+      });
+
+      test('setField throws on final field', () {
+        final instanceReflector = reflector.reflect(person);
+
+        expect(
+          () => instanceReflector.setField('id', '456'),
+          throwsA(isA<ReflectionException>()),
+        );
+      });
+    });
+
+    group('Method Invocation', () {
+      test('invoke calls method with arguments', () {
+        final instanceReflector = reflector.reflect(person);
+
+        final result = instanceReflector.invoke('greet', ['Hello']);
+        expect(result, equals('Hello, John!'));
+
+        instanceReflector.invoke('birthday', []);
+        expect(person.age, equals(31));
+      });
+
+      test('invoke throws on invalid arguments', () {
+        final instanceReflector = reflector.reflect(person);
+
+        expect(
+          () => instanceReflector.invoke('greet', [42]),
+          throwsA(isA<InvalidArgumentsException>()),
+        );
+      });
+    });
+
+    group('Constructor Invocation', () {
+      test('creates instance with default constructor', () {
+        final instance = reflector.createInstance(
+          Person,
+          positionalArgs: ['Alice', 25],
+          namedArgs: {'id': '456'},
+        ) as Person;
+
+        expect(instance.name, equals('Alice'));
+        expect(instance.age, equals(25));
+        expect(instance.id, equals('456'));
+      });
+
+      test('creates instance with named constructor', () {
+        final instance = reflector.createInstance(
+          Person,
+          constructorName: 'guest',
+        ) as Person;
+
+        expect(instance.name, equals('Guest'));
+        expect(instance.age, equals(0));
+        expect(instance.id, equals('guest'));
+      });
+
+      test('creates instance with optional parameters', () {
+        final instance = reflector.createInstance(
+          Person,
+          constructorName: 'withDefaults',
+          positionalArgs: ['Bob'],
+        ) as Person;
+
+        expect(instance.name, equals('Bob'));
+        expect(instance.age, equals(18)); // Default value
+        expect(instance.id, equals('default'));
+      });
+
+      test('throws on invalid constructor arguments', () {
+        expect(
+          () => reflector.createInstance(
+            Person,
+            positionalArgs: ['Alice'], // Missing required age
+            namedArgs: {'id': '456'},
+          ),
+          throwsA(isA<InvalidArgumentsException>()),
+        );
+      });
+
+      test('throws on non-existent constructor', () {
+        expect(
+          () => reflector.createInstance(
+            Person,
+            constructorName: 'nonexistent',
+          ),
+          throwsA(isA<ReflectionException>()),
+        );
+      });
+    });
+  });
+}