r3-reactive-extensions

1# R3: Modern Reactive Extensions for .NET
2 
3R3 is [Cysharp's](https://github.com/Cysharp/R3) ground-up reimplementation of Reactive
4Extensions — "the new future of dotnet/reactive and UniRx." It keeps the LINQ-over-events
5programming model but rebuilds the core types, error contract, and scheduler to fix
6long-standing problems in `System.Reactive` (Rx.NET). Use this skill when composing event
7streams, UI input, timers, or push-based pipelines in C#.
8 
9**Canonical sources** (link to these from code and docs):
10- Repository: https://github.com/Cysharp/R3
11- README (full operator reference): https://github.com/Cysharp/R3/blob/main/README.md
12- Author's design rationale: https://neuecc.medium.com/r3-a-new-modern-reimplementation-of-reactive-extensions-for-c-cf29abcc5826
13 
14## When to Use This Skill
15 
16Use this skill when:
17- Composing **events** over time — UI input, sensor/feed updates, websocket messages, domain events
18- You need operators like debounce, throttle, merge, combine-latest, distinct-until-changed
19- Building **MVVM** state with `ReactiveProperty` / `BindableReactiveProperty`
20- Bridging push-based streams with `Task` / `async` and `IAsyncEnumerable`
21- Migrating from `System.Reactive`, UniRx, or `IObservable<T>` code
22- You hit Rx pain points: subscriptions dying on exceptions, scheduler overhead, or leak hunting
23 
24**Not the right tool for:** request/response I/O (use `async/await`), bounded producer/consumer
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