Expand description
file:watch - register a native filesystem watcher for a URI.
VS Code’s DiskFileSystemProvider.watch(resource, opts) sends:
Arguments[0] = resource URI (object or path string)
Arguments[1] = { recursive: boolean, excludes: string[] }
Returns a numeric token that the caller passes to file:unwatch.
The token is stored as the string key in WatcherProvider::RegisterWatcher.
Events flow through FileWatcherProvider → $fileWatcher:event gRPC
notification → Cocoon → onDidChangeFile extension API.