How can I enter in security credentials to a website when running against Safari browser?

[Golshy]

Background
In the previous version of NightWatch, I would run against Chrome and am testing against a website that requires security credentials to be added in. I was able to get around this by running an export CREDENTIALS="https://username:password@" and adding this on to the rest of the URL which was stored in a login_url var.

Issue
While I am able to do the same thing in NightWatch v2 against Chrome, when running my scripts against Safari, despite entering in the URL with the security credentials already included, I am still met with an additional prompt to enter in the credentials.

I'm looking for help on how to enter the credentials with my scripts. Could anyone please advise on how I can resolve this issue to continue running tests in the Safari browser?