Why won't lua_ls report any errors when writting extra fields in the variable declaration?

[nullptr-yxw]

I wrote my code like this, but lua_ls won't report an error

---@class test
---@field abc any

---@type test
local a = {
    def = 10,
}

And only when I try to access the variable like print(a.def), will the lua_ls report an error.

[carsakiller]

I think you are looking for an exact class. Marking a class as exact should raise a warning when trying to inject fields.