Unable to run stylelint: Cannot find module 'postcss-resource'

[YodaDaCoda]

I started seeing this error a few days ago and my google-fu is failing me - I cannot find any references to "postcss-resource" online, nor in any of my local files, so I'm not sure where this is coming from.

I know this is light in information, but I'm not sure how to get more - please let me know what I can do to help.

[YodaDaCoda]

Update: I've realised that this occurs when the syntax is set to CSS and the file extension is .resource.

Interestingly, it doesn't occur when the syntax is set to SCSS and the file extension is .resource.