Figured I'd post about this in case someone runs into it.
For clarity: Running Windows 11 22H2
Problem
I've got a monorepo set up using NPM workspaces for my frontend, backend, and admin apps. My frontend uses an .npmrc file to install GSAP's Shockingly Green Plugins. The file was located in my frontend folder, where it was ignored by workspaces: npm WARN ignoring workspace config..., meaning gsap@npm:@gsap/shockingly gsap:npm@install results in:npm ERR! 404 Not Found - GET https://registry.npmjs.org/@gsap... - Not found.
Solution
Move the.npmrc file to the root folder of your monorepo. Moving the file here, solves this issue, as it isn't ignored by NPM Workspaces.
Hope this helps,
Nye