Question for npm config command

[sackh]

Hi,

I went through the code but could not understand how can run commands like setting a private registry in setup.py using
jupyter-packaging.

e.g.

npm config set registry https://registry.your-registry.npme.io/

for jupyterlab 2 I used to run this command in subprocess in setup.py as my widget has js dependency which is not available on npmjs.com.

Please let me know if this is supported?