What are common alternatives to Combine and when should I use them in Swift?

        // Example of using PromiseKit in Swift
        import PromiseKit

        func fetchData() -> Promise {
            return Promise { seal in
                let url = URL(string: "https://api.example.com/data")!
                URLSession.shared.dataTask(with: url) { data, response, error in
                    if let error = error {
                        seal.reject(error)
                    } else {
                        seal.fulfill(data!)
                    }
                }.resume()
            }
        }

        fetchData().done { data in
            print("Data received: \(data)")
        }.catch { error in
            print("Error: \(error)")
        }