I have to build a SharePoint Add In app. But, it seems like Microsoft and the SharePoint community has invested heavily in tooling for SharePoint Framework and Add In's are left behind in the past. I would love to leverage the PnP libraries with my add in. I don't know how to set up Gulp to move the files out of the node_modules directory and into the SharePoint Add In folders. The assumption across the board in all online examples and docs is that you are using VS Code or similar and you're building SPFx, not an Add In.
I appreciate any advice anyone can offer me so I can leverage what appear to be excellent libraries.