diff --git a/packages/contracts/lib/src/broadcasting/broadcaster.dart b/packages/contracts/lib/src/broadcasting/broadcaster.dart
index e69de29..1bccc69 100644
--- a/packages/contracts/lib/src/broadcasting/broadcaster.dart
+++ b/packages/contracts/lib/src/broadcasting/broadcaster.dart
@@ -0,0 +1,36 @@
+//import 'package:some_http_package/some_http_package.dart'; // Replace with actual HTTP package
+
+abstract class Broadcaster {
+  /// Authenticate the incoming request for a given channel.
+  ///
+  /// @param  Request  request
+  /// @return mixed
+  Future<dynamic> auth(Request request);
+
+  /// Return the valid authentication response.
+  ///
+  /// @param  Request  request
+  /// @param  mixed  result
+  /// @return mixed
+  Future<dynamic> validAuthenticationResponse(Request request, dynamic result);
+
+  /// Broadcast the given event.
+  ///
+  /// @param  List<String>  channels
+  /// @param  String  event
+  /// @param  Map<String, dynamic>  payload
+  /// @return void
+  ///
+  /// @throws BroadcastException
+  Future<void> broadcast(List<String> channels, String event, {Map<String, dynamic> payload = const {}});
+}
+
+class BroadcastException implements Exception {
+  final String message;
+  BroadcastException(this.message);
+  
+  @override
+  String toString() => 'BroadcastException: $message';
+}
+
+// TODO: Find dart library to replace symfony for Request Class.
\ No newline at end of file
diff --git a/packages/contracts/lib/src/broadcasting/factory.dart b/packages/contracts/lib/src/broadcasting/factory.dart
index e69de29..3d8c3d0 100644
--- a/packages/contracts/lib/src/broadcasting/factory.dart
+++ b/packages/contracts/lib/src/broadcasting/factory.dart
@@ -0,0 +1,10 @@
+
+import 'broadcaster.dart';
+
+abstract class Factory {
+  /// Get a broadcaster implementation by name.
+  ///
+  /// @param [name] The name of the broadcaster.
+  /// @return A [Broadcaster] implementation.
+  Broadcaster connection([String? name]);
+}
diff --git a/packages/contracts/lib/src/broadcasting/has_broadcast_channel.dart b/packages/contracts/lib/src/broadcasting/has_broadcast_channel.dart
index e69de29..6f1c201 100644
--- a/packages/contracts/lib/src/broadcasting/has_broadcast_channel.dart
+++ b/packages/contracts/lib/src/broadcasting/has_broadcast_channel.dart
@@ -0,0 +1,12 @@
+
+abstract class HasBroadcastChannel {
+  /// Get the broadcast channel route definition that is associated with the given entity.
+  ///
+  /// @return string
+  String broadcastChannelRoute();
+
+  /// Get the broadcast channel name that is associated with the given entity.
+  ///
+  /// @return string
+  String broadcastChannel();
+}
diff --git a/packages/contracts/lib/src/broadcasting/should_be_unique.dart b/packages/contracts/lib/src/broadcasting/should_be_unique.dart
index e69de29..2361d18 100644
--- a/packages/contracts/lib/src/broadcasting/should_be_unique.dart
+++ b/packages/contracts/lib/src/broadcasting/should_be_unique.dart
@@ -0,0 +1,4 @@
+
+abstract class ShouldBeUnique {
+  // No methods or properties defined; serves as a marker interface
+}
diff --git a/packages/contracts/lib/src/broadcasting/should_broadcast.dart b/packages/contracts/lib/src/broadcasting/should_broadcast.dart
index e69de29..0133c7c 100644
--- a/packages/contracts/lib/src/broadcasting/should_broadcast.dart
+++ b/packages/contracts/lib/src/broadcasting/should_broadcast.dart
@@ -0,0 +1,6 @@
+abstract class ShouldBroadcast {
+  /// Get the channels the event should broadcast on.
+  ///
+  /// Returns either a single channel or a list of channels.
+  dynamic broadcastOn();
+}
diff --git a/packages/contracts/lib/src/broadcasting/should_broadcast_now.dart b/packages/contracts/lib/src/broadcasting/should_broadcast_now.dart
index e69de29..7b45ccf 100644
--- a/packages/contracts/lib/src/broadcasting/should_broadcast_now.dart
+++ b/packages/contracts/lib/src/broadcasting/should_broadcast_now.dart
@@ -0,0 +1,5 @@
+import 'should_broadcast.dart';
+
+abstract class ShouldBroadcastNow implements ShouldBroadcast {
+  // Additional methods and properties can be added here if needed.
+}
diff --git a/packages/contracts/lib/src/bus/dispatcher.dart b/packages/contracts/lib/src/bus/dispatcher.dart
index e69de29..b847a49 100644
--- a/packages/contracts/lib/src/bus/dispatcher.dart
+++ b/packages/contracts/lib/src/bus/dispatcher.dart
@@ -0,0 +1,47 @@
+abstract class Dispatcher {
+  /// Dispatch a command to its appropriate handler.
+  ///
+  /// @param  dynamic  command
+  /// @return dynamic
+  dynamic dispatch(dynamic command);
+
+  /// Dispatch a command to its appropriate handler in the current process.
+  ///
+  /// Queueable jobs will be dispatched to the "sync" queue.
+  ///
+  /// @param  dynamic  command
+  /// @param  dynamic  handler
+  /// @return dynamic
+  dynamic dispatchSync(dynamic command, [dynamic handler]);
+
+  /// Dispatch a command to its appropriate handler in the current process.
+  ///
+  /// @param  dynamic  command
+  /// @param  dynamic  handler
+  /// @return dynamic
+  dynamic dispatchNow(dynamic command, [dynamic handler]);
+
+  /// Determine if the given command has a handler.
+  ///
+  /// @param  dynamic  command
+  /// @return bool
+  bool hasCommandHandler(dynamic command);
+
+  /// Retrieve the handler for a command.
+  ///
+  /// @param  dynamic  command
+  /// @return bool|dynamic
+  dynamic getCommandHandler(dynamic command);
+
+  /// Set the pipes commands should be piped through before dispatching.
+  ///
+  /// @param  List<dynamic>  pipes
+  /// @return this
+  Dispatcher pipeThrough(List<dynamic> pipes);
+
+  /// Map a command to a handler.
+  ///
+  /// @param  Map<dynamic, dynamic>  map
+  /// @return this
+  Dispatcher map(Map<dynamic, dynamic> map);
+}
diff --git a/packages/contracts/lib/src/bus/queueing_dispatcher.dart b/packages/contracts/lib/src/bus/queueing_dispatcher.dart
index e69de29..b83683a 100644
--- a/packages/contracts/lib/src/bus/queueing_dispatcher.dart
+++ b/packages/contracts/lib/src/bus/queueing_dispatcher.dart
@@ -0,0 +1,25 @@
+import 'dispatcher.dart';
+import 'batch.dart';
+import 'pending_batch.dart';
+
+// TODO: Missing imports will come from other ports refer to original PHP file.
+
+abstract class QueueingDispatcher implements Dispatcher {
+  /// Attempt to find the batch with the given ID.
+  ///
+  /// @param  String  batchId
+  /// @return Batch|null
+  Future<Batch?> findBatch(String batchId);
+
+  /// Create a new batch of queueable jobs.
+  ///
+  /// @param  List<dynamic> jobs
+  /// @return PendingBatch
+  PendingBatch batch(List<dynamic> jobs);
+
+  /// Dispatch a command to its appropriate handler behind a queue.
+  ///
+  /// @param  dynamic  command
+  /// @return dynamic
+  Future<dynamic> dispatchToQueue(dynamic command);
+}
diff --git a/packages/contracts/lib/src/cache/factory.dart b/packages/contracts/lib/src/cache/factory.dart
index e69de29..23c22b7 100644
--- a/packages/contracts/lib/src/cache/factory.dart
+++ b/packages/contracts/lib/src/cache/factory.dart
@@ -0,0 +1,9 @@
+import 'repository.dart';
+
+abstract class Factory {
+  /// Get a cache store instance by name.
+  ///
+  /// @param  String?  name
+  /// @return Repository
+  Repository store([String? name]);
+}
diff --git a/packages/contracts/lib/src/cache/lock.dart b/packages/contracts/lib/src/cache/lock.dart
index e69de29..be1e14e 100644
--- a/packages/contracts/lib/src/cache/lock.dart
+++ b/packages/contracts/lib/src/cache/lock.dart
@@ -0,0 +1,29 @@
+abstract class Lock {
+  /// Attempt to acquire the lock.
+  ///
+  /// @param Function? callback
+  /// @return dynamic
+  Future<dynamic> get([Function? callback]);
+
+  /// Attempt to acquire the lock for the given number of seconds.
+  ///
+  /// @param int seconds
+  /// @param Function? callback
+  /// @return dynamic
+  Future<dynamic> block(int seconds, [Function? callback]);
+
+  /// Release the lock.
+  ///
+  /// @return bool
+  Future<bool> release();
+
+  /// Returns the current owner of the lock.
+  ///
+  /// @return String
+  Future<String> owner();
+
+  /// Releases this lock in disregard of ownership.
+  ///
+  /// @return void
+  Future<void> forceRelease();
+}
diff --git a/packages/contracts/lib/src/cache/lock_provider.dart b/packages/contracts/lib/src/cache/lock_provider.dart
index e69de29..a87d964 100644
--- a/packages/contracts/lib/src/cache/lock_provider.dart
+++ b/packages/contracts/lib/src/cache/lock_provider.dart
@@ -0,0 +1,20 @@
+abstract class LockProvider {
+  /// Get a lock instance.
+  ///
+  /// @param  String  name
+  /// @param  int  seconds
+  /// @param  String|null  owner
+  /// @return Lock
+  Lock lock(String name, {int seconds = 0, String? owner});
+
+  /// Restore a lock instance using the owner identifier.
+  ///
+  /// @param  String  name
+  /// @param  String  owner
+  /// @return Lock
+  Lock restoreLock(String name, String owner);
+}
+
+abstract class Lock {
+  // Define the methods and properties that the Lock class should have
+}
diff --git a/packages/contracts/lib/src/cache/lock_timeout_exception.dart b/packages/contracts/lib/src/cache/lock_timeout_exception.dart
index e69de29..50e8245 100644
--- a/packages/contracts/lib/src/cache/lock_timeout_exception.dart
+++ b/packages/contracts/lib/src/cache/lock_timeout_exception.dart
@@ -0,0 +1,11 @@
+
+class LockTimeoutException implements Exception {
+  final String message;
+  
+  LockTimeoutException([this.message = '']);
+  
+  @override
+  String toString() {
+    return 'LockTimeoutException: $message';
+  }
+}
diff --git a/packages/contracts/lib/src/cache/repository.dart b/packages/contracts/lib/src/cache/repository.dart
index e69de29..2207cd7 100644
--- a/packages/contracts/lib/src/cache/repository.dart
+++ b/packages/contracts/lib/src/cache/repository.dart
@@ -0,0 +1,96 @@
+import 'package:meta/meta.dart';
+import 'package:psr/simple_cache.dart';
+import 'dart:async';
+
+// TODO: Find dart replacements for missing imports.
+
+abstract class Repository implements CacheInterface {
+  /// Retrieve an item from the cache and delete it.
+  ///
+  /// @template TCacheValue
+  ///
+  /// @param  List<String>|String  key
+  /// @param  TCacheValue|Future<TCacheValue> Function()  default
+  /// @return  Future<TCacheValue>
+  Future<dynamic> pull(dynamic key, [dynamic defaultValue]);
+
+  /// Store an item in the cache.
+  ///
+  /// @param  String  key
+  /// @param  dynamic  value
+  /// @param  DateTime|Duration|int|null  ttl
+  /// @return Future<bool>
+  Future<bool> put(String key, dynamic value, [dynamic ttl]);
+
+  /// Store an item in the cache if the key does not exist.
+  ///
+  /// @param  String  key
+  /// @param  dynamic  value
+  /// @param  DateTime|Duration|int|null  ttl
+  /// @return Future<bool>
+  Future<bool> add(String key, dynamic value, [dynamic ttl]);
+
+  /// Increment the value of an item in the cache.
+  ///
+  /// @param  String  key
+  /// @param  dynamic  value
+  /// @return Future<int|bool>
+  Future<dynamic> increment(String key, [int value = 1]);
+
+  /// Decrement the value of an item in the cache.
+  ///
+  /// @param  String  key
+  /// @param  dynamic  value
+  /// @return Future<int|bool>
+  Future<dynamic> decrement(String key, [int value = 1]);
+
+  /// Store an item in the cache indefinitely.
+  ///
+  /// @param  String  key
+  /// @param  dynamic  value
+  /// @return Future<bool>
+  Future<bool> forever(String key, dynamic value);
+
+  /// Get an item from the cache, or execute the given Closure and store the result.
+  ///
+  /// @template TCacheValue
+  ///
+  /// @param  String  key
+  /// @param  DateTime|Duration|Future<TCacheValue> Function()|int|null  ttl
+  /// @param  Future<TCacheValue> Function()  callback
+  /// @return Future<TCacheValue>
+  Future<dynamic> remember(String key, dynamic ttl, Future<dynamic> Function() callback);
+
+  /// Get an item from the cache, or execute the given Closure and store the result forever.
+  ///
+  /// @template TCacheValue
+  ///
+  /// @param  String  key
+  /// @param  Future<TCacheValue> Function()  callback
+  /// @return Future<TCacheValue>
+  Future<dynamic> sear(String key, Future<dynamic> Function() callback);
+
+  /// Get an item from the cache, or execute the given Closure and store the result forever.
+  ///
+  /// @template TCacheValue
+  ///
+  /// @param  String  key
+  /// @param  Future<TCacheValue> Function()  callback
+  /// @return Future<TCacheValue>
+  Future<dynamic> rememberForever(String key, Future<dynamic> Function() callback);
+
+  /// Remove an item from the cache.
+  ///
+  /// @param  String  key
+  /// @return Future<bool>
+  Future<bool> forget(String key);
+
+  /// Get the cache store implementation.
+  ///
+  /// @return CacheStore
+  CacheStore getStore();
+}
+
+abstract class CacheStore {
+  // Define methods that a CacheStore should have.
+}
diff --git a/packages/contracts/lib/src/cache/store.dart b/packages/contracts/lib/src/cache/store.dart
index e69de29..ebd5f3b 100644
--- a/packages/contracts/lib/src/cache/store.dart
+++ b/packages/contracts/lib/src/cache/store.dart
@@ -0,0 +1,67 @@
+abstract class Store {
+  /// Retrieve an item from the cache by key.
+  ///
+  /// @param  String  key
+  /// @return dynamic
+  dynamic get(String key);
+
+  /// Retrieve multiple items from the cache by key.
+  ///
+  /// Items not found in the cache will have a null value.
+  ///
+  /// @param  List<String>  keys
+  /// @return Map<String, dynamic>
+  Map<String, dynamic> many(List<String> keys);
+
+  /// Store an item in the cache for a given number of seconds.
+  ///
+  /// @param  String  key
+  /// @param  dynamic  value
+  /// @param  int  seconds
+  /// @return bool
+  bool put(String key, dynamic value, int seconds);
+
+  /// Store multiple items in the cache for a given number of seconds.
+  ///
+  /// @param  Map<String, dynamic>  values
+  /// @param  int  seconds
+  /// @return bool
+  bool putMany(Map<String, dynamic> values, int seconds);
+
+  /// Increment the value of an item in the cache.
+  ///
+  /// @param  String  key
+  /// @param  dynamic  value
+  /// @return int|bool
+  dynamic increment(String key, {dynamic value = 1});
+
+  /// Decrement the value of an item in the cache.
+  ///
+  /// @param  String  key
+  /// @param  dynamic  value
+  /// @return int|bool
+  dynamic decrement(String key, {dynamic value = 1});
+
+  /// Store an item in the cache indefinitely.
+  ///
+  /// @param  String  key
+  /// @param  dynamic  value
+  /// @return bool
+  bool forever(String key, dynamic value);
+
+  /// Remove an item from the cache.
+  ///
+  /// @param  String  key
+  /// @return bool
+  bool forget(String key);
+
+  /// Remove all items from the cache.
+  ///
+  /// @return bool
+  bool flush();
+
+  /// Get the cache key prefix.
+  ///
+  /// @return String
+  String getPrefix();
+}
diff --git a/packages/contracts/lib/src/config/repository.dart b/packages/contracts/lib/src/config/repository.dart
index e69de29..1765bee 100644
--- a/packages/contracts/lib/src/config/repository.dart
+++ b/packages/contracts/lib/src/config/repository.dart
@@ -0,0 +1,40 @@
+abstract class Repository {
+  /// Determine if the given configuration value exists.
+  ///
+  /// @param  String key
+  /// @return bool
+  bool has(String key);
+
+  /// Get the specified configuration value.
+  ///
+  /// @param  String key
+  /// @param  dynamic defaultValue
+  /// @return dynamic
+  dynamic get(String key, [dynamic defaultValue]);
+
+  /// Get all of the configuration items for the application.
+  ///
+  /// @return Map<String, dynamic>
+  Map<String, dynamic> all();
+
+  /// Set a given configuration value.
+  ///
+  /// @param  String key
+  /// @param  dynamic value
+  /// @return void
+  void set(String key, [dynamic value]);
+
+  /// Prepend a value onto an array configuration value.
+  ///
+  /// @param  String key
+  /// @param  dynamic value
+  /// @return void
+  void prepend(String key, dynamic value);
+
+  /// Push a value onto an array configuration value.
+  ///
+  /// @param  String key
+  /// @param  dynamic value
+  /// @return void
+  void push(String key, dynamic value);
+}
diff --git a/packages/contracts/lib/src/console/application.dart b/packages/contracts/lib/src/console/application.dart
index e69de29..2618481 100644
--- a/packages/contracts/lib/src/console/application.dart
+++ b/packages/contracts/lib/src/console/application.dart
@@ -0,0 +1,17 @@
+// TODO: Find dart replacements for missing imports.
+class ConsoleApplication implements Application {
+  String _lastOutput = '';
+
+  @override
+  int call(String command, {List<String> parameters = const [], OutputInterface? outputBuffer}) {
+    // Implementation of the command execution
+    // Set _lastOutput with the command output for demonstration
+    _lastOutput = 'Command executed: $command';
+    return 0; // Return appropriate exit code
+  }
+
+  @override
+  String output() {
+    return _lastOutput;
+  }
+}
diff --git a/packages/contracts/lib/src/console/isolatable.dart b/packages/contracts/lib/src/console/isolatable.dart
index e69de29..e3f5284 100644
--- a/packages/contracts/lib/src/console/isolatable.dart
+++ b/packages/contracts/lib/src/console/isolatable.dart
@@ -0,0 +1,4 @@
+
+abstract class Isolatable {
+  // Abstract class with no methods
+}
diff --git a/packages/contracts/lib/src/console/kernel.dart b/packages/contracts/lib/src/console/kernel.dart
index e69de29..ae7b550 100644
--- a/packages/contracts/lib/src/console/kernel.dart
+++ b/packages/contracts/lib/src/console/kernel.dart
@@ -0,0 +1,51 @@
+import 'package:symfony_console/symfony_console.dart';
+
+// TODO: Replace missing imports with dart equivalents.
+
+abstract class Kernel {
+  /// Bootstrap the application for artisan commands.
+  void bootstrap();
+
+  /// Handle an incoming console command.
+  ///
+  /// @param InputInterface input
+  /// @param OutputInterface? output
+  /// @return int
+  int handle(InputInterface input, [OutputInterface? output]);
+
+  /// Run an Artisan console command by name.
+  ///
+  /// @param String command
+  /// @param List<dynamic> parameters
+  /// @param OutputInterface? outputBuffer
+  /// @return int
+  int call(String command, [List<dynamic> parameters = const [], OutputInterface? outputBuffer]);
+
+  /// Queue an Artisan console command by name.
+  ///
+  /// @param String command
+  /// @param List<dynamic> parameters
+  /// @return PendingDispatch
+  PendingDispatch queue(String command, [List<dynamic> parameters = const []]);
+
+  /// Get all of the commands registered with the console.
+  ///
+  /// @return List<dynamic>
+  List<dynamic> all();
+
+  /// Get the output for the last run command.
+  ///
+  /// @return String
+  String output();
+
+  /// Terminate the application.
+  ///
+  /// @param InputInterface input
+  /// @param int status
+  /// @return void
+  void terminate(InputInterface input, int status);
+}
+
+class PendingDispatch {
+  // Implement the PendingDispatch class here
+}
diff --git a/packages/contracts/lib/src/console/prompts_for_missing_input.dart b/packages/contracts/lib/src/console/prompts_for_missing_input.dart
index e69de29..71f318c 100644
--- a/packages/contracts/lib/src/console/prompts_for_missing_input.dart
+++ b/packages/contracts/lib/src/console/prompts_for_missing_input.dart
@@ -0,0 +1,3 @@
+abstract class PromptsForMissingInput {
+  // This is a placeholder for future methods.
+}
diff --git a/packages/contracts/lib/src/container/binding_resolution_exception.dart b/packages/contracts/lib/src/container/binding_resolution_exception.dart
index e69de29..7798bbb 100644
--- a/packages/contracts/lib/src/container/binding_resolution_exception.dart
+++ b/packages/contracts/lib/src/container/binding_resolution_exception.dart
@@ -0,0 +1,12 @@
+import 'package:psr_container/psr_container.dart';
+
+// TODO: find packages to replace missing imports.
+
+class BindingResolutionException implements Exception, ContainerException {
+  final String message;
+
+  BindingResolutionException([this.message = '']);
+
+  @override
+  String toString() => 'BindingResolutionException: $message';
+}
diff --git a/packages/contracts/lib/src/container/circular_dependency_exception.dart b/packages/contracts/lib/src/container/circular_dependency_exception.dart
index e69de29..adeefd1 100644
--- a/packages/contracts/lib/src/container/circular_dependency_exception.dart
+++ b/packages/contracts/lib/src/container/circular_dependency_exception.dart
@@ -0,0 +1,12 @@
+import 'package:psr/psr.dart';
+
+// TODO: Find packages to replace missing imports.
+
+class CircularDependencyException implements Exception, ContainerExceptionInterface {
+  final String message;
+
+  CircularDependencyException([this.message = '']);
+
+  @override
+  String toString() => 'CircularDependencyException: $message';
+}
diff --git a/packages/contracts/lib/src/container/container.dart b/packages/contracts/lib/src/container/container.dart
index e69de29..c632c95 100644
--- a/packages/contracts/lib/src/container/container.dart
+++ b/packages/contracts/lib/src/container/container.dart
@@ -0,0 +1,183 @@
+import 'package:meta/meta.dart';
+
+abstract class Container {
+  /// Determine if the given abstract type has been bound.
+  ///
+  /// @param  String  abstract
+  /// @return bool
+  bool bound(String abstract);
+
+  /// Alias a type to a different name.
+  ///
+  /// @param  String  abstract
+  /// @param  String  alias
+  /// @return void
+  ///
+  /// @throws LogicException
+  void alias(String abstract, String alias);
+
+  /// Assign a set of tags to a given binding.
+  ///
+  /// @param  List<String>|String  abstracts
+  /// @param  List<dynamic>|dynamic  tags
+  /// @return void
+  void tag(dynamic abstracts, dynamic tags);
+
+  /// Resolve all of the bindings for a given tag.
+  ///
+  /// @param  String  tag
+  /// @return Iterable
+  Iterable tagged(String tag);
+
+  /// Register a binding with the container.
+  ///
+  /// @param  String  abstract
+  /// @param  Function|String|null  concrete
+  /// @param  bool  shared
+  /// @return void
+  void bind(String abstract, [dynamic concrete, bool shared = false]);
+
+  /// Bind a callback to resolve with Container::call.
+  ///
+  /// @param  List<String>|String  method
+  /// @param  Function  callback
+  /// @return void
+  void bindMethod(dynamic method, Function callback);
+
+  /// Register a binding if it hasn't already been registered.
+  ///
+  /// @param  String  abstract
+  /// @param  Function|String|null  concrete
+  /// @param  bool  shared
+  /// @return void
+  void bindIf(String abstract, [dynamic concrete, bool shared = false]);
+
+  /// Register a shared binding in the container.
+  ///
+  /// @param  String  abstract
+  /// @param  Function|String|null  concrete
+  /// @return void
+  void singleton(String abstract, [dynamic concrete]);
+
+  /// Register a shared binding if it hasn't already been registered.
+  ///
+  /// @param  String  abstract
+  /// @param  Function|String|null  concrete
+  /// @return void
+  void singletonIf(String abstract, [dynamic concrete]);
+
+  /// Register a scoped binding in the container.
+  ///
+  /// @param  String  abstract
+  /// @param  Function|String|null  concrete
+  /// @return void
+  void scoped(String abstract, [dynamic concrete]);
+
+  /// Register a scoped binding if it hasn't already been registered.
+  ///
+  /// @param  String  abstract
+  /// @param  Function|String|null  concrete
+  /// @return void
+  void scopedIf(String abstract, [dynamic concrete]);
+
+  /// "Extend" an abstract type in the container.
+  ///
+  /// @param  String  abstract
+  /// @param  Function  closure
+  /// @return void
+  ///
+  /// @throws InvalidArgumentException
+  void extend(String abstract, Function closure);
+
+  /// Register an existing instance as shared in the container.
+  ///
+  /// @param  String  abstract
+  /// @param  dynamic  instance
+  /// @return dynamic
+  dynamic instance(String abstract, dynamic instance);
+
+  /// Add a contextual binding to the container.
+  ///
+  /// @param  String  concrete
+  /// @param  String  abstract
+  /// @param  Function|String  implementation
+  /// @return void
+  void addContextualBinding(String concrete, String abstract, dynamic implementation);
+
+  /// Define a contextual binding.
+  ///
+  /// @param  String|List<String>  concrete
+  /// @return ContextualBindingBuilder
+  ContextualBindingBuilder when(dynamic concrete);
+
+  /// Get a closure to resolve the given type from the container.
+  ///
+  /// @param  String  abstract
+  /// @return Function
+  Function factory(String abstract);
+
+  /// Flush the container of all bindings and resolved instances.
+  ///
+  /// @return void
+  void flush();
+
+  /// Resolve the given type from the container.
+  ///
+  /// @param  String  abstract
+  /// @param  Map<String, dynamic>  parameters
+  /// @return dynamic
+  ///
+  /// @throws BindingResolutionException
+  dynamic make(String abstract, [Map<String, dynamic> parameters = const {}]);
+
+  /// Call the given Function / class@method and inject its dependencies.
+  ///
+  /// @param  dynamic  callback
+  /// @param  Map<String, dynamic>  parameters
+  /// @param  String|null  defaultMethod
+  /// @return dynamic
+  dynamic call(dynamic callback, [Map<String, dynamic> parameters = const {}, String defaultMethod]);
+
+  /// Determine if the given abstract type has been resolved.
+  ///
+  /// @param  String  abstract
+  /// @return bool
+  bool resolved(String abstract);
+
+  /// Register a new before resolving callback.
+  ///
+  /// @param  String|Function  abstract
+  /// @param  Function|null  callback
+  /// @return void
+  void beforeResolving(dynamic abstract, [Function? callback]);
+
+  /// Register a new resolving callback.
+  ///
+  /// @param  String|Function  abstract
+  /// @param  Function|null  callback
+  /// @return void
+  void resolving(dynamic abstract, [Function? callback]);
+
+  /// Register a new after resolving callback.
+  ///
+  /// @param  String|Function  abstract
+  /// @param  Function|null  callback
+  /// @return void
+  void afterResolving(dynamic abstract, [Function? callback]);
+}
+
+class ContextualBindingBuilder {
+  // Implementation for ContextualBindingBuilder
+}
+
+class BindingResolutionException implements Exception {
+  // Implementation for BindingResolutionException
+}
+
+class InvalidArgumentException implements Exception {
+  // Implementation for InvalidArgumentException
+}
+
+class LogicException implements Exception {
+  // Implementation for LogicException
+}
diff --git a/packages/contracts/lib/src/container/contextual_binding_builder.dart b/packages/contracts/lib/src/container/contextual_binding_builder.dart
index e69de29..376bdb4 100644
--- a/packages/contracts/lib/src/container/contextual_binding_builder.dart
+++ b/packages/contracts/lib/src/container/contextual_binding_builder.dart
@@ -0,0 +1,23 @@
+abstract class ContextualBindingBuilder {
+  /// Define the abstract target that depends on the context.
+  ///
+  /// [abstract] The abstract target.
+  /// Returns the current instance.
+  ContextualBindingBuilder needs(String abstract);
+
+  /// Define the implementation for the contextual binding.
+  ///
+  /// [implementation] The implementation which can be a Closure, String, or List.
+  void give(dynamic implementation);
+
+  /// Define tagged services to be used as the implementation for the contextual binding.
+  ///
+  /// [tag] The tag to use.
+  void giveTagged(String tag);
+
+  /// Specify the configuration item to bind as a primitive.
+  ///
+  /// [key] The configuration key.
+  /// [defaultValue] The default value.
+  void giveConfig(String key, [dynamic defaultValue]);
+}