Generalization Shines

Look at this beauty.

/// Send URL request and publish results.
func movieDataTaskPublisher<T: Decodable>(urlRequest: URLRequest, type: T.Type)
-> AnyPublisher<T, Error> {
    return URLSession.shared
        .dataTaskPublisher(for: urlRequest)
        .map {$0.data}
        .decode(type: T.self, decoder: JSONDecoder())
        .eraseToAnyPublisher()
}

/// Send a request and publish a stream of Decodable.
func fetch<T: Decodable>(endPoint: String, userDefaults: UserDefaults?)
-> AnyPublisher<T, Error> {
    do {
        let urlRequest = try prepareRequestFor(endPoint: endPoint,
                                               userDefaults: userDefaults)
        return movieDataTaskPublisher(urlRequest: urlRequest, type: T.self)
    } catch MovieServiceError.misconfiguration {
        return Empty<T, Error>().eraseToAnyPublisher()
    } catch {
        return Empty<T, Error>().eraseToAnyPublisher()
    }
}