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# Why `expo-file-system` had no way to reactively observe file or directory changes. This adds a `watch()` method to `File` and `Directory` that lets developers subscribe to filesystem events without polling. # How - Added a `FileSystemWatcher` native shared object on iOS (using `DispatchSource`) and Android (using `FileObserver`) that emits `change` events with debouncing. - Exposed a JS `FileSystemWatcher` class that wraps the native object, maps raw events to typed `WatchEvent<T>` objects, and auto-stops on `deleted`/`renamed` of the watched target. - Added `.watch()` convenience methods on `File` and `Directory` that return a `WatchSubscription` (with `remove()`). # Test Plan - Test Suite tests - NCL section - TS-side unit tests # Checklist - [x] I added a `changelog.md` entry and rebuilt the package sources according to [this short guide](https://github.com/expo/expo/blob/main/CONTRIBUTING.md#-before-submitting) - [ ] This diff will work correctly for `npx expo prebuild` & EAS Build (eg: updated a module plugin). - [x] Conforms with the [Documentation Writing Style Guide](https://github.com/expo/expo/blob/main/guides/Expo%20Documentation%20Writing%20Style%20Guide.md)
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