environment variable not accessible

[arunzone]

wait-on https-get://$DEMO_URL && npm run cypress run
Is there any way I can pass/substitute environment variable in the url
I want to run this in different environment
it si stuck forever
> wait-on https-get://$DEMO_URL && npm run cypress run

[kamolins]

This is not an issue with this library.
While it isn't impossible to somehow make it work as you want, I would suggest the following:
Create a JS script that is invoking wait-on programmatically and then you can simply access your demo URL with proess.env.DEMO_URL

Edit: If you are just running it in a shell script, it should substitute it by default if DEMO_URL has a value. It does get trickier if you want to define that inside an NPM script.

[joelbernstein]

This is an odd question. The shell will interpolate the values of any environment variables long before it exec's node.