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docs: add quick guide for circular dependency detection to README
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@@ -8,7 +8,6 @@
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A **Binding** acts as a configuration for how to create or provide a particular dependency. Bindings support:
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- Direct instance assignment (`toInstance()`, `toInstanceAsync()`)
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- Lazy providers (sync/async functions)
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- Provider functions supporting dynamic parameters
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@@ -239,6 +238,74 @@ class ApiClientImpl implements ApiClient {
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- [x] Null-safe Resolution (tryResolve/tryResolveAsync)
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- [x] Circular Dependency Detection (Local and Global)
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## Quick Guide: Circular Dependency Detection
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CherryPick can detect circular dependencies in your DI configuration, helping you avoid infinite loops and hard-to-debug errors.
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**How to use:**
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### 1. Enable Cycle Detection for Development
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**Local detection (within one scope):**
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```dart
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final scope = CherryPick.openSafeRootScope(); // Local detection enabled by default
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// or, for an existing scope:
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scope.enableCycleDetection();
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```
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**Global detection (across all scopes):**
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```dart
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CherryPick.enableGlobalCrossScopeCycleDetection();
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final rootScope = CherryPick.openGlobalSafeRootScope();
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```
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### 2. Error Example
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If you declare mutually dependent services:
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```dart
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class A { A(B b); }
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class B { B(A a); }
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scope.installModules([
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Module((bind) {
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bind<A>().to((s) => A(s.resolve<B>()));
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bind<B>().to((s) => B(s.resolve<A>()));
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}),
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]);
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scope.resolve<A>(); // Throws CircularDependencyException
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```
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### 3. Typical Usage Pattern
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- **Always enable detection** in debug and test environments for maximum safety.
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- **Disable detection** in production for performance (after code is tested).
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```dart
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import 'package:flutter/foundation.dart';
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void main() {
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if (kDebugMode) {
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CherryPick.enableGlobalCycleDetection();
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CherryPick.enableGlobalCrossScopeCycleDetection();
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}
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runApp(MyApp());
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}
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```
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### 4. Handling and Debugging Errors
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On detection, `CircularDependencyException` is thrown with a readable dependency chain:
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```dart
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try {
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scope.resolve<MyService>();
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} on CircularDependencyException catch (e) {
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print('Dependency chain: ${e.dependencyChain}');
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}
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```
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**More details:** See [cycle_detection.en.md](doc/cycle_detection.en.md)
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## Documentation
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- [Circular Dependency Detection (English)](doc/cycle_detection.en.md)
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@@ -258,4 +325,4 @@ Licensed under the [Apache License 2.0](http://www.apache.org/licenses/LICENSE-2
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## Links
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- [GitHub Repository](https://github.com/pese-git/cherrypick)
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- [GitHub Repository](https://github.com/pese-git/cherrypick)
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