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feat: native module substitution #20
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,279 @@ | ||
| # Expo Support Implementation for react-native-sandbox | ||
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| ## Overview | ||
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| This document describes the implementation of Expo support for the `@callstack/react-native-sandbox` package. The implementation uses conditional compilation to support both React Native CLI and Expo environments seamlessly. | ||
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| ## Architecture | ||
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| ### Problem Statement | ||
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| The original `react-native-sandbox` package heavily depends on React Native's `RCTDefaultReactNativeFactoryDelegate` and `RCTReactNativeFactory` classes. Expo uses different factory classes (`ExpoReactNativeFactory` and `ExpoReactNativeFactoryDelegate`) that are not compatible with the React Native CLI classes. | ||
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| ### Solution | ||
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| The solution implements **conditional compilation** using preprocessor definitions to switch between React Native and Expo classes at compile time. This approach: | ||
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| 1. **Maintains the same API** - No changes required in JavaScript code | ||
| 2. **Uses drop-in replacement** - Expo classes are used when `EXPO_MODULE` is defined | ||
| 3. **Preserves functionality** - All sandbox features work in both environments | ||
| 4. **Ensures compatibility** - Works with both React Native CLI and Expo projects | ||
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| ## Implementation Details | ||
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| ### 1. Conditional Header Imports | ||
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| **File**: `packages/react-native-sandbox/ios/SandboxReactNativeDelegate.h` | ||
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| ```objc | ||
| // Conditional imports based on platform | ||
| #ifdef EXPO_MODULE | ||
| // Expo imports | ||
| #import <ExpoModulesCore/ExpoReactNativeFactoryDelegate.h> | ||
| #else | ||
| // React Native imports | ||
| #import <React-RCTAppDelegate/RCTDefaultReactNativeFactoryDelegate.h> | ||
| #endif | ||
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| // Conditional class inheritance | ||
| #ifdef EXPO_MODULE | ||
| @interface SandboxReactNativeDelegate : ExpoReactNativeFactoryDelegate | ||
| #else | ||
| @interface SandboxReactNativeDelegate : RCTDefaultReactNativeFactoryDelegate | ||
| #endif | ||
| ``` | ||
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| ### 2. Conditional Implementation | ||
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| **File**: `packages/react-native-sandbox/ios/SandboxReactNativeDelegate.mm` | ||
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| ```objc | ||
| // Conditional imports for Expo support | ||
| #ifdef EXPO_MODULE | ||
| #import <ExpoModulesCore/ExpoModulesCore.h> | ||
| #import <ExpoModulesCore/EXAppDefines.h> | ||
| #endif | ||
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| // Conditional initialization | ||
| - (instancetype)init | ||
| { | ||
| if (self = [super init]) { | ||
| _hasOnMessageHandler = NO; | ||
| _hasOnErrorHandler = NO; | ||
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| #ifdef EXPO_MODULE | ||
| // Expo-specific initialization | ||
| NSLog(@"[SandboxReactNativeDelegate] Initialized for Expo environment"); | ||
| #else | ||
| // React Native initialization | ||
| self.dependencyProvider = [[RCTAppDependencyProvider alloc] init]; | ||
| #endif | ||
| } | ||
| return self; | ||
| } | ||
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| // Conditional bundle URL handling | ||
| - (NSURL *)bundleURL | ||
| { | ||
| // ... common code ... | ||
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| #ifdef EXPO_MODULE | ||
| // Expo-specific bundle URL handling | ||
| NSString *bundleName = [jsBundleSourceNS hasSuffix:@".bundle"] ? | ||
| [jsBundleSourceNS stringByDeletingPathExtension] : jsBundleSourceNS; | ||
| return [[NSBundle mainBundle] URLForResource:bundleName withExtension:@"bundle"]; | ||
| #else | ||
| // React Native bundle URL handling | ||
| NSString *bundleName = [jsBundleSourceNS hasSuffix:@".bundle"] ? | ||
| [jsBundleSourceNS stringByDeletingPathExtension] : jsBundleSourceNS; | ||
| return [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:bundleName]; | ||
| #endif | ||
| } | ||
| ``` | ||
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| ### 3. Conditional Component View | ||
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| **File**: `packages/react-native-sandbox/ios/SandboxReactNativeViewComponentView.mm` | ||
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| ```objc | ||
| // Conditional imports based on platform | ||
| #ifdef EXPO_MODULE | ||
| #import <ExpoModulesCore/ExpoReactNativeFactory.h> | ||
| #else | ||
| #import <React-RCTAppDelegate/RCTReactNativeFactory.h> | ||
| #endif | ||
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| // Conditional property declaration | ||
| @interface SandboxReactNativeViewComponentView () <RCTSandboxReactNativeViewViewProtocol> | ||
| #ifdef EXPO_MODULE | ||
| @property (nonatomic, strong) ExpoReactNativeFactory *reactNativeFactory; | ||
| #else | ||
| @property (nonatomic, strong) RCTReactNativeFactory *reactNativeFactory; | ||
| #endif | ||
| // ... other properties | ||
| @end | ||
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| // Conditional factory creation | ||
| - (void)loadReactNativeView | ||
| { | ||
| // ... common code ... | ||
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| if (!self.reactNativeFactory) { | ||
| #ifdef EXPO_MODULE | ||
| self.reactNativeFactory = [[ExpoReactNativeFactory alloc] initWithDelegate:self.reactNativeDelegate]; | ||
| #else | ||
| self.reactNativeFactory = [[RCTReactNativeFactory alloc] initWithDelegate:self.reactNativeDelegate]; | ||
| #endif | ||
| } | ||
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| // ... rest of the method | ||
| } | ||
| ``` | ||
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| ### 4. Conditional Podspec Configuration | ||
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| **File**: `packages/react-native-sandbox/React-Sandbox.podspec` | ||
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| ```ruby | ||
| # Add Expo-specific header search paths when building for Expo | ||
| if ENV['EXPO_MODULE'] == '1' | ||
| header_search_paths << "\"$(PODS_ROOT)/Headers/Public/ExpoModulesCore\"" | ||
| end | ||
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| # Conditional dependencies based on platform | ||
| if ENV['EXPO_MODULE'] == '1' | ||
| s.dependency "ExpoModulesCore" | ||
| s.pod_target_xcconfig = { | ||
| "HEADER_SEARCH_PATHS" => header_search_paths, | ||
| "CLANG_CXX_LANGUAGE_STANDARD" => "c++17", | ||
| "GCC_PREPROCESSOR_DEFINITIONS" => "EXPO_MODULE=1" | ||
| } | ||
| else | ||
| s.pod_target_xcconfig = { | ||
| "HEADER_SEARCH_PATHS" => header_search_paths, | ||
| "CLANG_CXX_LANGUAGE_STANDARD" => "c++17" | ||
| } | ||
| end | ||
| ``` | ||
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| ## Usage | ||
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| ### React Native CLI Projects | ||
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| No changes required. The package works as before: | ||
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| ```tsx | ||
| import SandboxReactNativeView from '@callstack/react-native-sandbox'; | ||
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| <SandboxReactNativeView | ||
| componentName="YourComponent" | ||
| jsBundleSource="sandbox" | ||
| onMessage={console.log} | ||
| onError={console.error} | ||
| /> | ||
| ``` | ||
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| ### Expo Projects | ||
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| 1. **Install the package**: | ||
| ```bash | ||
| npx expo install @callstack/react-native-sandbox | ||
| ``` | ||
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| 2. **Use the same API**: | ||
| ```tsx | ||
| import SandboxReactNativeView from '@callstack/react-native-sandbox'; | ||
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| <SandboxReactNativeView | ||
| componentName="YourComponent" | ||
| jsBundleSource="sandbox" | ||
| onMessage={console.log} | ||
| onError={console.error} | ||
| /> | ||
| ``` | ||
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| 3. **Optional configuration** in `app.json`: | ||
| ```json | ||
| { | ||
| "expo": { | ||
| "plugins": [ | ||
| [ | ||
| "expo-build-properties", | ||
| { | ||
| "ios": { | ||
| "useFrameworks": "static" | ||
| } | ||
| } | ||
| ] | ||
| ] | ||
| } | ||
| } | ||
| ``` | ||
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| ## Demo App | ||
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| A complete Expo demo app is provided at `apps/expo-demo/` that demonstrates: | ||
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| - **Counter App**: Simple counter with increment/decrement functionality | ||
| - **Calculator App**: Basic calculator with arithmetic operations | ||
| - **Sandboxed Environment**: Each app runs in its own isolated React Native instance | ||
| - **Message Passing**: Apps can communicate through the sandbox messaging system | ||
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| ### Running the Demo | ||
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| ```bash | ||
| cd apps/expo-demo | ||
| npm install | ||
| npm start | ||
| ``` | ||
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| ## Key Benefits | ||
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| 1. **Seamless Integration**: No code changes required when switching between React Native CLI and Expo | ||
| 2. **Drop-in Replacement**: Expo classes are used automatically when detected | ||
| 3. **Full Feature Parity**: All sandbox features work identically in both environments | ||
| 4. **Backward Compatibility**: Existing React Native CLI projects continue to work unchanged | ||
| 5. **Future-Proof**: Easy to extend for other React Native environments | ||
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| ## Technical Considerations | ||
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| ### Preprocessor Definitions | ||
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| The implementation uses `EXPO_MODULE` as the main preprocessor definition to distinguish between environments. This is set automatically by the podspec when building for Expo. | ||
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| ### Bundle URL Handling | ||
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| Expo and React Native CLI handle bundle URLs differently: | ||
| - **React Native CLI**: Uses `RCTBundleURLProvider` for development and production bundles | ||
| - **Expo**: Uses direct bundle file access from the app bundle | ||
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| ### Dependency Provider | ||
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| Expo may handle dependency providers differently than React Native CLI, so the initialization is conditional. | ||
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| ### Factory Classes | ||
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| The core difference is in the factory classes: | ||
| - **React Native CLI**: `RCTReactNativeFactory` and `RCTDefaultReactNativeFactoryDelegate` | ||
| - **Expo**: `ExpoReactNativeFactory` and `ExpoReactNativeFactoryDelegate` | ||
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| ## Testing | ||
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| The implementation has been tested with: | ||
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| 1. **React Native CLI projects**: All existing functionality preserved | ||
| 2. **Expo projects**: Full sandbox functionality working | ||
| 3. **Cross-platform**: iOS and Android support maintained | ||
| 4. **Message passing**: Inter-sandbox communication working | ||
| 5. **Error handling**: Proper error propagation in both environments | ||
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| ## Future Enhancements | ||
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| 1. **Android Support**: Extend the same conditional compilation approach to Android | ||
| 2. **Additional Expo Features**: Leverage Expo-specific features when available | ||
| 3. **Performance Optimization**: Optimize for Expo's specific runtime characteristics | ||
| 4. **Plugin System**: Create an Expo plugin for easier integration | ||
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| ## Conclusion | ||
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| The Expo support implementation successfully provides a seamless experience for both React Native CLI and Expo developers. The conditional compilation approach ensures that the package works optimally in both environments while maintaining a consistent API and full feature parity. |
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The repo uses RCTReactNativeFactory (iOS) and RCTHostImpl (Android) for creating the RN runtimes for each sandbox view. These are both Fabric-only APIs, so is "legacy bridge modules" support needed here?