the output of fs.watchFile when I save a .coffee file

compile.coffee

{spawn} = require 'child_process'
{print} = require 'util'
fs = require 'fs'

coffee_file = 'convert.coffee' 
coffee_eval = 'run/eval.coffee'
jade_file   = 'html.jade'
stylus_file = 'page.styl'

fs.watchFile coffee_file, (e) ->
  result = spawn 'coffee', ['-bc', coffee_file]
  msg = ''
  result.stderr.on 'data', (str) ->
    msg+= str
  result.stderr.on 'end', ->
    console.log 'msg: ', msg
  print "!! #{coffee_file}\n"

fs.watchFile coffee_eval, (e) ->
  result = spawn 'coffee', ['-bc', coffee_eval]
  msg = ''
  result.stderr.on 'data', (str) ->
    msg+= str
  result.stderr.on 'end', ->
    console.log 'msg: ', msg
  print "!! #{coffee_eval}\n"

fs.watchFile jade_file, ->
  spawn 'jade', [jade_file]
  print "!! #{jade_file}\n"

fs.watchFile stylus_file, ->
  spawn 'stylus', [stylus_file]
  print "!! #{stylus_file}\n"

output.log

$ coffee compile.coffee 
{ dev: 2053,
  ino: 5767525,
  mode: 33204,
  nlink: 1,
  uid: 1000,
  gid: 1000,
  rdev: 0,
  size: 0,
  blksize: 4096,
  blocks: 0,
  atime: Sun, 06 May 2012 08:20:14 GMT,
  mtime: Sun, 06 May 2012 10:41:41 GMT,
  ctime: Sun, 06 May 2012 10:41:41 GMT }
!! convert.coffee
{ dev: 2053,
  ino: 5767525,
  mode: 33204,
  nlink: 1,
  uid: 1000,
  gid: 1000,
  rdev: 0,
  size: 12657,
  blksize: 4096,
  blocks: 32,
  atime: Sun, 06 May 2012 08:20:14 GMT,
  mtime: Sun, 06 May 2012 10:41:41 GMT,
  ctime: Sun, 06 May 2012 10:41:41 GMT }
!! convert.coffee
msg:  
msg: