RCTModuleData.mm

unsigned int methodCount;
Method *methods = class_copyMethodList(moduleClass, &methodCount);
for (unsigned int i = 0; i < methodCount; i++) {
  Method method = methods[i];
  SEL selector = method_getName(method);
  if ([NSStringFromSelector(selector) hasPrefix:@"__rct_export__"]) {
    IMP imp = method_getImplementation(method);
    NSArray *entries = ((NSArray *(*)(id, SEL))imp)(_moduleClass, selector);
    //...
    [moduleMethods addObject:/* Object representing the method */];
  }
}