swift-protobuf | Plugin and runtime library for using protobuf with Swift | Serialization library

DispatchQueue.global(qos: .background).async {
            guard let path = Bundle.main.path(forResource: "graphics", ofType: "txt") else {
                print("Dang! File wasn't found!")
                return
            }
            let cal = Calendar.current
            let d1 = Date()

            guard let streamReader = StreamReader(path: path) else {
                print("Dang! StreamReader couldn't be created!")
                return
            }
            var counter = 0
            while !streamReader.atEof {
                guard let nextLine = streamReader.nextLine() else {
                    print("Oops! Reached the end before printing!")
                    break
                }
                let json = JSON(parseJSON: nextLine)

                counter += 1
                print("\(counter): \(nextLine)")
            }
            let d2 = Date() 
            let components = cal.dateComponents([.minute], from: d2, to: d1)
            print("Diff: \(components.minute!)")
        }
    }