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feat(iOS): get TurboModules conforming to protocol #53282

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tjzel wants to merge 1 commit into from
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feat(iOS): get TurboModules conforming to protocol #53282

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1 change: 1 addition & 0 deletions packages/react-native/React/Base/RCTTurboModuleRegistry.h
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Original file line number Diff line number Diff line change
Expand Up @@ -22,5 +22,6 @@
* TurboModules to TurboModules is complete.
*/
- (id)moduleForName:(const char *)moduleName warnOnLookupFailure:(BOOL)warnOnLookupFailure;
- (id)getModulesConformingToProtocol:(Protocol *)protocol;
- (BOOL)moduleIsInitialized:(const char *)moduleName;
@end
18 changes: 18 additions & 0 deletions ...ive/ReactCommon/react/nativemodule/core/platform/ios/ReactCommon/RCTTurboModuleManager.mm
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Expand Up @@ -996,6 +996,24 @@ - (id)moduleForName:(const char *)moduleName warnOnLookupFailure:(BOOL)warnOnLoo
return module;
}

- (id)getModulesConformingToProtocol:(Protocol *)protocol{
NSMutableArray *modules = [NSMutableArray new];

for (auto &pair : _moduleHolders) {
auto * moduleName = pair.first.c_str();
Class moduleClass = [self _getModuleClassFromName:moduleName];

if ([moduleClass conformsToProtocol:protocol]) {

@cipolleschi cipolleschi Aug 15, 2025

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checking whether a module conforms to a protocol is a very expensive operation (see the official docs).
Here we are also iterating over all the modules that are loaded in the the app. If this happens at startup or at critical time, for apps that have many modules, this can cause a startup time regression.

@tjzel tjzel Aug 15, 2025

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I was afraid this would be a blocker.

This is change is a part I extracted from #50788 because I figured out it could be useful anyway. I personally need it for the BundleConsumer interface from the aforementioned PR - I wanted to make an API usable for everyone, therefore needed a way to detect all the TurboModules that implement a given interface. More on that is in the proposal we talked about https://docs.google.com/document/d/1jo93F1gPD3xrXU1UMb5ahuZpIh4JITHd_-FC6lIzB_k

I also had an implementation that instead of conformsToProtocol uses respondsToSelector but I figured it's more or less the same implementation wise and performance wise.

Initially I did it using (a bit obscure) RCTModulesConformingToInterface but there's no respective codegen functionality for Android and I wanted to make the implementations similar.

@cipolleschi cipolleschi Aug 19, 2025

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I don't think that we need an approach that works for everybody.

Also, we already have something similar in the Codegen config:

"ios": {
      "modules": {
        "TestModule": {
          "className": "<iOS-class-implementing-the-RCTModuleProvider-protocol>",
          "unstableRequiresMainQueueSetup": false,
          "conformsToProtocols": ["RCTImageURLLoader", "RCTURLRequestHandler", "RCTImageDataDecoder"],
        }
      },

I'd say that the modules that conforms to the specific protocol you are interested into should add the conformace there. Then, depending on what you need from that protocol, we can have a specific hook somewhere in the codebase. for example, those three protocols are used here

@tjzel tjzel Aug 19, 2025

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Yes, it's very useful and I previously prototyped with it on iOS but there seems to be no respective APIs for Android. How would you handle such cases on Android?

id module = [self moduleForName:moduleName];
if (module) {
[modules addObject:module];
}
}
}

return modules;
}

- (BOOL)moduleIsInitialized:(const char *)moduleName
{
std::unique_lock<std::mutex> guard(_moduleHoldersMutex);
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