command line in IIS using Server.CreateObject("WScript.Shell") (in asp classic) not working

[courtens]

I am not sure what I am doing wrong...

function make_minify_version(file_name,input_dir,output_dir)
	dim command, shell
	command = "%comspec% /c html-minifier " & _
		" --input-dir """ & input_dir & """ " & _
		" --output-dir """ & output_dir & """ " &_
		" -o """ & file_name & """"
	Set shell = Server.CreateObject("WScript.Shell")
	shell.exec command
	set shell = nothing
end function

which should executes:

html-minifier --input-dir "D:\www\static_html\" --output-dir "D:\www\static_html\min\" -o test.html 

Running the above in cmd I am getting the error:

You need to specify where to write the output files with the option --output-dir

Running

whitespace -V

I get

4.0.0

I would really like to save the file as test.html.min in the same folder instead of having it in a sub folder with the same name.
Is that possible?

[courtens]

I got it working

Minifier_command = "npm exec --no -- html-minifier " & _
	"""" & absoluteFileLocationAndName & """ " & _
	" -o """ & absoluteFileLocationAndName & ".min"" " & _
	" -c ""C:\Windows\System32\node_modules\html-minifier\html-cli-config-file.conf"""

the only problem I am having now is that I need to know when it is finished. How can a get a return?