afnetworkexample.m

NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:@"http://example.com/upload" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        [formData appendPartWithFileURL:[NSURL fileURLWithPath:@"file://path/to/image.jpg"] name:@"file" fileName:@"filename.jpg" mimeType:@"image/jpeg" error:nil];
    } error:nil];

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];

NSURLSessionUploadTask *uploadTask;
uploadTask = [manager
              uploadTaskWithStreamedRequest:request
              progress:^(NSProgress * _Nonnull uploadProgress) {
                  // This is not called back on the main queue.
                  // You are responsible for dispatching to the main queue for UI updates
                  dispatch_async(dispatch_get_main_queue(), ^{
                      //Update the progress view
                      [progressView setProgress:uploadProgress.fractionCompleted];
                  });
              }
              completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
                  if (error) {
                      NSLog(@"Error: %@", error);
                  } else {
                      NSLog(@"%@ %@", response, responseObject);
                  }
              }];

[uploadTask resume];

declarations.ts

declare class AFHTTPRequestSerializer extends NSObject implements AFURLRequestSerialization {
	multipartFormRequestWithMethodURLStringParametersConstructingBodyWithBlockError(method: string, URLString: string, parameters: NSDictionary, block: (p1: AFMultipartFormData) => void): NSMutableURLRequest;
}
interface AFMultipartFormData {
	appendPartWithFileURLNameFileNameMimeTypeError(fileURL: NSURL, name: string, fileName: string, mimeType: string): boolean;
}
declare var AFMultipartFormData: {
	prototype: AFMultipartFormData;
};

what-im-trying.ts

let request: NSMutableURLRequest = AFHTTPRequestSerializer.serializer().multipartFormRequestWithMethodURLStringParametersConstructingBodyWithBlockError(
	'POST',
	'http://192.168.0.3:5338/upload',
	null,
	function block(formData: AFMultipartFormData) {
		global.tnsconsole.dump('formData', formData)
		global.tnsconsole.dump('formData.description', formData.description)
		global.tnsconsole.error('formData.appendPartWithFileURLNameFileNameMimeTypeError', formData.appendPartWithFileURLNameFileNameMimeTypeError)
	}
)

it says formData.appendPartWithFileURLNameFileNameMimeTypeError is undefined 😢