Attachment is not sent, unless value of 'filePath' key is hardcoded. about grunt-nodemailer HOT 3 CLOSED

var  path = require('path');
console.log(path.normalize(__dirname + '/path/file.txt'));

                     attachments: [{                                             
                         filePath: __dirname + grunt.file.expand(grunt.config.get('vars.dest') + '*')[0]
                     }]                                                          

Running "nodemailer:send" (nodemailer) task
[D] Task source: /home/vv/work/own/js/uos/ads/node_modules/grunt-nodemailer/tasks/nodemailer.js
Verifying property nodemailer.send exists in config...OK
File: [no files]
Options: transport={"type":"SMTP","options":{"service":"Gmail","auth":{"user":"[email protected]","pass":"..."}}}, message={"from":"...","to":"...","cc":"","bcc":"","subject":"ads: new developer build","text":"\n\nEmail sent by ASH robat v2.","attachments":[{"filePath":"/home/vv/work/own/js/uos/adsundefined"}]}, recipients=[], from="", subject="", html="", text=""
Sending 1 e-mail to recipients: ...
Message sent successfully.

  7         grunt.config('nodemailer.options.message.attachments',                  
  6             [{filePath: grunt.file.expand(grunt.config('vars.dest') + '*')[0]}]);