Expose JSIExectuor::flush

React/Base/RCTBridge+Private.h

@@ -102,6 +102,11 @@ RCT_EXTERN void RCTRegisterModule(Class);
  */
 - (void)dispatchBlock:(dispatch_block_t)block queue:(dispatch_queue_t)queue;
 
+/**
+ * Call JSIExecutor::flush
+ */
+- (void)flush;
+
 /**
  * Get the module data for a given module name. Used by UIManager to implement
  * the `dispatchViewManagerCommand` method.

React/CxxBridge/RCTCxxBridge.mm

@@ -1239,6 +1239,11 @@ - (void)dispatchBlock:(dispatch_block_t)block queue:(dispatch_queue_t)queue
   }
 }
 
+- (void)flush
+{
+  _reactInstance->flush();
+}
+
 #pragma mark - RCTInvalidating
 
 - (void)invalidate

ReactCommon/cxxreact/Instance.cpp

@@ -246,6 +246,10 @@ std::shared_ptr<CallInvoker> Instance::getJSCallInvoker() {
   return std::static_pointer_cast<CallInvoker>(jsCallInvoker_);
 }
 
+void Instance::flush() {
+  nativeToJsBridge_->runOnExecutorQueue([](JSExecutor *executor) { executor->flush(); });
+}
+
 RuntimeExecutor Instance::getRuntimeExecutor() {
   std::weak_ptr<NativeToJsBridge> weakNativeToJsBridge = nativeToJsBridge_;
 

ReactCommon/cxxreact/Instance.h

@@ -83,6 +83,7 @@ class RN_EXPORT Instance {
       std::string &&method,
       folly::dynamic &&params);
   void callJSCallback(uint64_t callbackId, folly::dynamic &&params);
+  void flush();
 
   // This method is experimental, and may be modified or removed.
   void registerBundle(uint32_t bundleId, const std::string &bundlePath);