How to set gulp stylus url to specific prefix address?

Question

css

Good afternoon, I would like to understand how, when writing code in a .styl file:
background-image url("picture.jpg")
At the output, get:

background-image: url("path_to_images/picture.jpg");

Variant with:

$prefix = "path_to_images"
background-image url($prefix + "picture.jpg")

please do not offer

Answer 1

Try to make a function, similar to the linear-gradient from nib (there at the bottom of the page)