js.node.fs

..
FSWatcher	Objects returned from `Fs.watch` are of this type.
FSWatcherChangeType	Enumeration of possible types of changes for 'change' event.
FSWatcherEvent	Enumeration of the events emitted by `FSWatcher`.
ReadStream	Readable file stream.
ReadStreamEvent
Stats	Objects returned from `Fs.stat`, `Fs.lstat` and `Fs.fstat` and their synchronous counterparts are of this type.
WriteStream	Writable file stream.
WriteStreamEvent