Trying to edit a mod with DNSpy but it says 'type or namespace not found'

[NastyFlytrap]

I presume DNSpy is missing the vintage story specific libraries, and files, and stuff that gets attached when you're making your mod in VS Code, but i dont know how to give these files to it. Its saying things like 'The type or namespace name 'ModSystem' could not be found (are you missing a using directive or an assembly reference?)' but not just for ModSystem, but also for 'IServerPlayer', 'ICoreServerAPI', 'Vintagestory' and many others