variable in the image's source isn't allowed?

[aleodev]

When I try to add a variable to the files parameter or add a query string to it, it gives me the error that no files have been specified. For example, using uuid inside of the files path wouldn't work.

// doesn't work
    var UUID = uuidv4()
    var UUIDPATH = `server/assets/${UUID}/*.jpeg`
spritesheet(UUIDPATH, {format: 'json', path: 'server/assets/test/'}, function (err) {
      if (err) throw err;
      console.log('spritesheet successfully generated');
    });
// doesn't work
    var UUID = uuidv4()
spritesheet(`server/assets/${UUID}/*.jpeg`, {format: 'json', path: 'server/assets/test/'}, function (err) {
      if (err) throw err;
      console.log('spritesheet successfully generated');
    });

//doesn't work
    var UUID = uuidv4()
spritesheet('server/assets/'+UUID+'/*.jpeg', {format: 'json', path: 'server/assets/test/'}, function (err) {
      if (err) throw err;
      console.log('spritesheet successfully generated');
    });

[kperwel]

I'm missing the point of using unique id in image source path. It does not matter how You will create path, as long as it is correct.