JsonSettings.cs

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using System.Text.Json;

namespace Lilith.Core.Extensions;

public static class JsonSettings
{
    public static T Load<T>(string path, Func<T, bool> valid) where T : class
    {
        var value = JsonSerializer.Deserialize<T>(File.ReadAllText(path));
        if (value is null || !valid(value)) throw new JsonException("Saved preferences contain invalid values.");
        return value;
    }

    public static void Save<T>(string path, T value) => AtomicFile.Write(path, temporary =>
        File.WriteAllText(temporary, JsonSerializer.Serialize(value, new JsonSerializerOptions { WriteIndented = true })));
}