Gorilla

A .NET source generator for creating discriminated unions in C# with OneOf. Inspired by the flutter package freezed and the F# discriminated union pattern.

🚀 Overview

Gorilla helps you create type-safe, exhaustive discriminated unions in C#. It automatically generates matching methods, type checks, and conversions to make working with union types intuitive and safe. Gorilla uses OneOf under the hood to implement the discriminated union pattern but adds a layer of compile-time convenience and safety through source generation.

📦 Installation

# Install both packages
dotnet add package Zooper.Gorilla.Attributes
dotnet add package Zooper.Gorilla.Generators

🔧 Usage

1. Define your union type

Add the [DiscriminatedUnion] attribute with the types that make up the union:

using Zooper.Gorilla.Attributes;

[DiscriminatedUnion]
public partial class SignInError
{
	[Variant]
	public static partial SignInError ServiceUnavailable();

	[Variant]
	public static partial SignInError InvalidCredentials();

	[Variant]
	public static partial SignInError InternalError();
}

2. Use your union type

return SignInError.ServiceUnavailable();

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgements

• OneOf - The foundation for this library
• F# Discriminated Unions - The inspiration for the pattern

Made with ❤️ by the Zooper team