See [PostCSS] docs for examples for your environment.
Options
cssPath - option to redefine relative images resolving directory (by default the same as css file folder)
imagesPath - variable to define absolute images base path
type - define cachebuster type, mtime by default, allows: mtime, checksum (checksum based on md5),
or a function which receives the absolute path to the file as an argument and whose return value becomes
the url pathname.
Contributors
Gleb Mikheev (https://github.com/glebmachine)
Graham Bates (https://github.com/grahambates)
Yusuke Yagyu (https://github.com/gyugyu)
Jackson Ray Hamilton (https://github.com/jacksonrayhamilton)