Unity Read/Write SaveAsync/LoadAsync streamingAssets file utils

FileUtils.cs

using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Newtonsoft.Json; // https://docs.unity3d.com/Packages/com.unity.nuget.newtonsoft-json@2.0/manual/index.html
using UnityEngine;

public static class FileUtils
{
    public static string RootDirectory
    {
        get
        {
#if UNITY_EDITOR || UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX
            return Application.streamingAssetsPath;
#elif UNITY_IOS
            return Application.dataPath + "/Raw";
#elif UNITY_ANDROID
            return "jar:file://" + Application.dataPath + "!/assets";
#endif
        }
    }

    public static string ReadFile(string fileName)
    {
        string assetsDirectory = RootDirectory;
        var filePath = Path.Combine(assetsDirectory, fileName);

        var data = "";

        if (File.Exists(filePath))
            data = File.ReadAllText(filePath);
        else
            Debug.LogError($"File {fileName} at {assetsDirectory} doesn't exist");

        return data;
    }

    public static void WriteFile(string data, string fileName)
    {
        string assetsDirectory = RootDirectory;
        var filePath = Path.Combine(assetsDirectory, fileName);

        if (File.Exists(filePath))
        {
            File.WriteAllText(filePath, data);
        }
        else
            Debug.LogError($"File {fileName} at {assetsDirectory} doesn't exist");
    }

    public static async void SaveFileAsync<T>(T value, string fileName, CancellationTokenSource cancellationTokenSource)
    {
        cancellationTokenSource?.Cancel();
        cancellationTokenSource = new CancellationTokenSource();

        var data = await Task.Run(() => JsonConvert.SerializeObject(value), cancellationTokenSource.Token);

        WriteFile(data, fileName);
    }

    public static async Task<T> LoadFileAsync<T>(string fileName, CancellationTokenSource cancellationTokenSource)
    {
        cancellationTokenSource?.Cancel();
        cancellationTokenSource = new CancellationTokenSource();

        var data = ReadFile(fileName);

        return await Task.Run(() => JsonConvert.DeserializeObject<T>(data), cancellationTokenSource.Token);
    }
}