React Native: How to export a method with a return value?

Question

What is the best way to export a method with a return value in React Native?

I know there is RCT_EXPORT_METHOD, but that only works for methods that are

Answer 1

Try return values with Callbacks

RCT_EXPORT_METHOD(findEvents:(RCTResponseSenderBlock)callback)
{
  NSArray *events = ...
  callback(@[[NSNull null], events]);
}