`to` is treated as a file if directory contains a dot

[ilijapuaca]

When specifying a glob for the from property, and using a folder name with a dot for to, the result is a file that's few bytes large instead of a folder containing all the glob matches.

Trivial example:

...
{
  from: './**/*',
  to: './foo.bar'
}

[Mykyta-Chernenko]

encounter the same issue, it essentially doesn't allow me to copy 'chart.js' library as it treats the to as a file