code: function watch(file) {
        if (!~extensions.indexOf(extname(file))) return;
        fs.watchFile(file, { interval: interval }, function(curr, prev){
          if (curr.mtime > prev.mtime) {
            console.log('  \033[36mchanged\033[0m \033[90m- %s\033[0m', file);
            master.restartWorkers(signal);
          }
        });
      }
docs: watch file for changes