How do I delete globals within a type definition file?

[roblox-ui]

Using type definition files I'm using this LSP to create autocomplete and typechecking for a game's scripting engine. They use loadstring() with setfenv(). Within a custom environment you can define your own globals, this is mostly fine because I can overwrite and add globals, but I can't remove them. Is there any way to remove them? If not, can I fork this extension to get my desired behavior?: