FileSystemWatcher Support

[manuelroemer]

New Feature Proposal

Description

Files should provide support for watching the underlying file system.
It is never guaranteed that every file system has watch-support, meaning that such an API should be opt-in, i.e. it will not be guaranteed a watcher will always work/will always notify about every change. It's basically going to be "we're reporting whatever is possible, don't blindly trust what we're telling you about the changes".

System.IO already provides native support for this via the FileSystemWatcher and UWP apparently allows limited watching via search trickery. The in-memory file system can easily be extended with change notifications. Therefore, the three current implementations should all, to some extent, support such an API.

Discussion

I'm not sure about how exactly the API will look like. .NET's FileSystemWatcher might be a good inspiration though, but other approaches are, of course, also possible.