How to bridge React Native Promise to Swift

Taken from the answers at Got "is not a recognized Objective-C method" when bridging Swift to React-Native; the fact that it doesn't work, is because of the difference in the first argument labels.

To make it work with your initial code you should write the first argument of your Swift to be without a name, like this:

@objcfunc loginWithEmail(_ resolve: RCTPromiseResolveBlock, rejecter reject: RCTPromiseRejectBlock) -> Void {    //   the trick  ^    resolve("This method is no longer troublesome")}

Adding so that the complete solution is shown

.m - note that the resolve parameter is not "named"

RCT_EXTERN_METHOD(loginWithEmail: (RCTPromiseResolveBlock)resolve                                  rejecter:(RCTPromiseRejectBlock)reject)

.swift - same as @Koen

@objc func loginWithEmail(_ resolve: @escaping RCTPromiseResolveBlock,                            rejecter reject: @escaping RCTPromiseRejectBlock ) -> Void {}

I did eventually come up with a solution. It is not exactly like React native people intended it I believe, but it works. So i can continue and maybe someone else is set on the right track with my solution. Although, please post the way it is supposed to be.

So I decided to start with the Objective-C way first. So I created a .h file for my module.

MyLoginBridge.h

#import <React/RCTBridgeModule.h>@interface MyLoginBridge : NSObject <RCTBridgeModule>@end

Then alter the .m file

#import "MyLoginBridge.h"#import "MyProject-Swift.h" // Include the swift header manually@implementation MyLoginBridgeRCT_EXPORT_MODULE(MyCustomLoginJSName);RCT_EXPORT_METHOD(loginWithEmail:(RCTPromiseResolveBlock)resolve   rejecter:(RCTPromiseRejectBlock)reject){    // Manually init the module and call swift function    MyLoginModule* module = [[MyLoginModule alloc] init];    [module loginWithEmailWithResolver:resolve rejecter:reject];}@end

The swift file and the bridging header remained the same. This works.