Documentation still refers to a template that provides paths

[silkentrance]

See

https://github.com/raszi/node-tmp#asynchronous-filename-generation-1

The documentation must be updated, as this is no longer supported.

[silkentrance]

Reopening as the fix did not essentially fix the original problem.
The fix to this is that the template option must be relative to os.tmpdir().