R3: Modern Reactive Extensions for .NET

R3 is Cysharp's ground-up reimplementation of Reactive Extensions — "the new future of dotnet/reactive and UniRx." It keeps the LINQ-over-events programming model but rebuilds the core types, error contract, and scheduler to fix long-standing problems in System.Reactive (Rx.NET). Use this skill when composing event streams, UI input, timers, or push-based pipelines in C#.

Canonical sources (link to these from code and docs):

• Repository: https://github.com/Cysharp/R3
• README (full operator reference): https://github.com/Cysharp/R3/blob/main/README.md
• Author's design rationale: https://neuecc.medium.com/r3-a-new-modern-reimplementation-of-reactive-extensions-for-c-cf29abcc5826

When to Use This Skill