Supported autolinking on the new architecture

[grahammendick]

React Native 0.70 added autolinking to Android. This removes the need for the user to make manual changes for native component library dependencies on Android in the new architecture. But it doesn’t support libraries with interfaceOnly components. These components use c++ state so have to opt-out of the full codegen and hand-write some of the files.

I asked React Native how to support autolinking with interfaceOnly components. Ended up going with react native screens approach because React Native’s answer didn’t work. A custom CMakeLists.txt that takes custom hand-written cpp combined with the react native codegen’ed ones.

The tricky part is getting the custom component descriptors included in the rncli.cpp generated by the android build. This file includes navigationreactnative.h so had to sneak them in there (ingenious solution from react native screens). Although this file is generated, included it with the hand-written ones and included the custom descriptors. Had to exclude this file from the podspec otherwise couldn’t build on ios. For example, NVActionBarComponentDescriptor is hand-written so isn't part of ComponentDescriptors.h but is included in navigationreactnative.h.

#include <navigationreactnative.h>
#include <react/renderer/components/navigationreactnative/ComponentDescriptors.h>

namespace facebook {
namespace react {

void rncli_registerProviders(std::shared_ptr<ComponentDescriptorProviderRegistry const> providerRegistry) {
  providerRegistry->add(concreteComponentDescriptorProvider<NVActionBarComponentDescriptor>());