How to implement a wrapper for methods with a completion closure using async/await syntax?

To wrap a method with a completion handler into async/await, you can use withCheckedContinuation or withCheckedThrowingContinuation in Swift. This allows transforming an asynchronous method with a callback into a function that can be called with await.

Example:

func fetchData(completion: @escaping (Result<String, Error>) -> Void) {
    // Asynchronous operation with completion
}

func fetchDataAsync() async throws -> String {
    try await withCheckedThrowingContinuation { continuation in
        fetchData { result in
            switch result {
            case .success(let data):
                continuation.resume(returning: data)
            case .failure(let error):
                continuation.resume(throwing: error)
            }
        }
    }
}

This approach simplifies working with asynchronous code and improves readability.