Failing on namespace with special characters

[befreestudios]

I have a salesforce project that is using their "lightning" design system (ugh, I know). They have an node package which is great. However, when installed, in node_modules it gets namespaced like this @salesforce-ux.design-system

I'm trying to copy directories from this namespace into a build directory in my workspace. contrib-copy fails when it reaches this task because it cannot resolve the namespace. Has anyone ran across anything similar? Or anyone have any idea how I can get around this? Thank you in advance!!!

Here is my Task

{
  "nonull": true,
  "expand": true,
  "cwd": "node_modules/",
  "src": "@salesforce-ux.design-system/**/*",
  "dest": "build/css/slds/"
}

And my Error

Copying node_modules/@salesforce-ux.design-system/**/* -> build/css/@salesforce-ux.design-system/**/*
Reading node_modules/@salesforce-ux.design-system/**/*...ERROR
Warning: Unable to read "node_modules/@salesforce-ux.design-system/**/*" file (Error code: ENOENT). Use --force to continue.