Indexing a table by an enum

[vallode]

Hello, thank you the time spent developing the lua LSP.

I have a quick question regarding table types. In the example below I have an enum, and a table that is accessed with those enum values only, but I cannot figure out a way for the LSP to accurately display this information.

---@enum building_id
local building_id = {
  ANY = -1,
  ONE = 0,
  TWO = 1,
}

---@type { [building_id]: { name: string } }
local building_attributes = {}

building_attributes[0].name is marked as unknown. I have tried to mark the enum as (key) accessible (since in my instance the attributes are a userdata that can be accessed either via integer or string) but it does not change the outcome.

Thanks!

[carsakiller]

The enum is expected to be used instead of 0:

---@enum building_id
local building_id = {
    ANY = -1,
    ONE = 0,
    TWO = 1,
}

---@type { [building_id]: { name: string } }
local building_attributes = {}

local anyName = building_attributes[building_id.ANY].name

While building_id.ANY and -1 are equal, I think it does make sense to expect the enum to be used (that is its purpose)... but I can also see how this could be annoying because building_id.ANY is equal to -1 and they could be used interchangeably.

This may just not be supported right now. You can convert this discussion to an issue and we can see.