How to change variable type after deceleration for all lines after the change · LuaLS/lua-language-server · Discussion #3236

EmekC
Jul 22, 2025

---@param dmginfo CTakeDamageInfo
function foo(dmginfo)
 ---@type Player | Entity
 local attacker = dmginfo:GetAttacker()
 
 # attacker must be player after this!
 if not attacker:IsPlayer() then return end
 # but I still get errors like: Cannot assign `Entity|Player` to parameter `Player`.
 # How can i cast it as such and not Player|Entity
end

I want to cast a variable type after declaration for the global scope, my idea is that after i check if the attacker is a certain type i want to cast it as just this type for all the code below

Answered by tomlau10

Jul 22, 2025

I believe that you ran into another strange known issue: #2326
where the @cast is not working if you file doesn't have a trailing newline 🙈

Could you try to add a new empty newline at the end of your file?

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Replies: 2 comments 3 replies

tomlau10
Jul 22, 2025

use @cast https://luals.github.io/wiki/annotations/#cast
=> ---@cast attacker Player

3 replies

@EmekC

EmekC Jul 22, 2025
Author

I've already tried.
image

function ENT:OnTakeDamage(dmginfo)
 ---@type Player|Entity
 local attacker = dmginfo:GetAttacker()
 if not attacker:IsPlayer() then return end
 ---@cast attacker Player
 local wep = attacker:GetActiveWeapon()