Swevo.AutoFeatureFlag

[FeatureFlags]
public enum AppFeatures
{
 DarkMode,
 NewCheckout,
 BetaApi
}
// ↓ Generator produces ↓
public interface IAppFeaturesFlags
{
 bool IsDarkModeEnabled { get; }
 bool IsNewCheckoutEnabled { get; }
 bool IsBetaApiEnabled { get; }
}
public sealed class AppFeaturesFlags : IAppFeaturesFlags
{
 public AppFeaturesFlags(IFeatureFlagProvider provider) ...
 public bool IsDarkModeEnabled => provider.IsEnabled("DarkMode");
 public bool IsNewCheckoutEnabled => provider.IsEnabled("NewCheckout");
 public bool IsBetaApiEnabled => provider.IsEnabled("BetaApi");
}

Why not Microsoft.FeatureManagement?

Quick Start

dotnet add package Swevo.AutoFeatureFlag

// 1. Define your flags
[FeatureFlags]
public enum Features { DarkMode, BetaCheckout }
// 2. Wire up (choose your DI framework)
var provider = new InMemoryFeatureFlagProvider();
services.AddSingleton<IFeatureFlagProvider>(provider);
services.AddSingleton<IFeaturesFlags, FeaturesFlags>();
// 3. Inject and use
public class CheckoutService(IFeaturesFlags flags)
{
 public void Process()
 {
 if (flags.IsBetaCheckoutEnabled)
 RunBetaCheckout();
 else
 RunCheckout();
 }
}

InMemoryFeatureFlagProvider

var provider = new InMemoryFeatureFlagProvider();
provider.Enable("DarkMode"); // → IsEnabled("DarkMode") == true
provider.Disable("DarkMode"); // → IsEnabled("DarkMode") == false
provider.SetEnabled("DarkMode", true); // same as Enable

Testing

public class CheckoutServiceTests
{
 private readonly InMemoryFeatureFlagProvider _provider = new();
 private readonly FeaturesFlags _flags;
 public CheckoutServiceTests() => _flags = new FeaturesFlags(_provider);
 [Fact]
 public void BetaCheckout_WhenEnabled_UsesBetaPath()
 {
 _provider.Enable("BetaCheckout");
 var sut = new CheckoutService(_flags);
 // assert beta path taken ...
 }
}

Custom Providers

public sealed class ConfigFeatureFlagProvider(IConfiguration config) : IFeatureFlagProvider
{
 public bool IsEnabled(string flagName)
 => config.GetValue<bool>($"FeatureFlags:{flagName}");
 public void Enable(string flagName) => throw new NotSupportedException("Use appsettings.json");
 public void Disable(string flagName) => throw new NotSupportedException("Use appsettings.json");
 public void SetEnabled(string flagName, bool enabled) => throw new NotSupportedException();
}

Diagnostics

Part of the Swevo ecosystem

Related Packages

License