# Page Not Found

The URL `recipes/immutability-helpers` does not exist.

You might be looking for one of these pages:
- [Immutability Helpers](https://www.ngxs.io/concepts/state/immutability-helpers.md)
- [Unit Testing](https://www.ngxs.io/recipes/unit-testing.md)
- [Dynamic Plugins](https://www.ngxs.io/recipes/dynamic-plugins.md)
- [RxAngular Integration](https://www.ngxs.io/recipes/intregration-with-rxangular.md)
- [Authentication](https://www.ngxs.io/recipes/authentication.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://www.ngxs.io/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://www.ngxs.io/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/concepts/state/immutability-helpers.md`)
- Use `Accept: text/markdown` header for content negotiation