Windows: fs.watch triggered twice on fs.writeFileSync

[peterwmwong]

Test case and results between Win 7 and Ubuntu: https://gist.github.com/1326322

PS - Another difference is on FSWatcher.close()... It triggers the watch callback on Windows, but not on Ubuntu.

[bnoordhuis]

@igorzi: The callback after close() seems like a bug in the Windows implementation.

[igorzi]

Yeah, this sounds like a bug in libuv. I'll investigate.

[byteshijinn]

It caused by windows itself. It is said that multiple notifications are expected. What you see as "one" modification is really numerous calls to the Win32 API. Since there is no transaction to bucket all of the calls together, the filesystem is forced to send out multiple notifications for various kernel calls.
So it's not a bug of libuv.

[igorzi]

Actually there are 2 issues here:

1. 2 change callbacks are fired on a write to a file.
2. change callback is fired after 'close'

As @bombworm mentioned, the 1st issue is by design on windows. The 2nd issue is a bug in libuv, which was fixed in joyent/libuv@0fb3769