Node.js: Track new files in a directory

I would like to track new files in a directory. I used the script given in the documentation: http://nodejs.org/api/fs.html#fs_fs_watch_filename_options_listener

var fs = require('fs');
fs.watch('mydir/', function (event, filename) {
    console.log('event is: ' + event);
    if (filename) {
        console.log('filename provided: ' + filename);
    } else {
        console.log('filename not provided');
    }
});

And I added files to mydir/ using touch hello.txt for example.

When running the script, I don't get the new file name, because the emitted event is rename!! Here is the console output.

event is: rename
filename not provided

How can I get the file new name hello.txt?

Thanks.