DependencyContainer.swift

class DependencyContainer {
  static let shared = DependencyContainer()

  private var types: [String: Any] = [:]

  func registerType<T: Any>(_ type: T.Type, named name: String? = nil, creator: @escaping (String) -> T) {
    let key = name ?? String(describing: type)
    types[key] = creator
  }

  func resolveType<T>(_ type: T.Type, named name: String? = nil) -> T? {
    let key = name ?? String(describing: type)
    guard let creator = types[key] as? (String) -> T else {
      return nil
    }
    return creator(key)
  }
}