NetworkingA_B.swift

import Foundation

class NetworkingA {

  func loadJSON<T: Decodable>(withURL url: URL, type: T.Type = T.self, completion: @escaping (Result<T, Error>) -> Void) {
    urlSession.dataTask(with: url) { data, response, error in
      // ...
    }.resume()
  }
}

import Alamofire

class NetworkingB {

  func load<T: Decodable>(_ url: URL, type: T.Type = T.self, completion: @escaping (Result<T, Error>) -> Void) {
    AF.request(url).responseDecodable(of: type, queue: .main, decoder: JSONDecoder()) { response in
      // ...
    }                                                                           
  }
}