node.js - fs.watch fired twice when I change the watched file

Question

 fs.watch( 'example.xml', function ( curr, prev ) {
   // on file change we can read the new xml
   fs.readFile( 'example.xml','utf8', function ( err, data ) {
     if ( err ) throw err;
     console.dir(data);
     console.log('Done');
   });
 });

OUTPUT:

• some data
• Done X 1
• some data
• Done X 2

It is my usage fault or ..?

Answer 1

The fs.watch api:

1. is unstable
2. has known "behaviour" with regards repeated notifications. Specifically, the windows case being a result of windows design, where a single file modification can be multiple calls to the windows API