Question mark optional syntax not supported in fun() declarations

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Windows

What is the issue affecting?

Type Checking

Expected Behaviour

Optional value to actually be optional

Actual Behaviour

It's not optional.

This code block should show as Human? and throw warnings for not checking nil. If I manually annotate with ---@param man Human? this works as expected.

The class in question:

---@class Command
---@field info string What the command does.
---@field usage string? How to use the command.
---@field alias string[]? Aliases of the command.
---@field canCall (fun(player: Player): boolean)? Function which checks whether a player can call this command.
---@field call fun(player: Player, human: Human?, args: string[]) Calls the command.
---@field autoComplete fun(args: string[])? Function which manipulates arguments when pressing tab in the terminal.
---@field cooldownTime number? How many seconds a player has to wait before using the command again.

I have also tried with human?: Human and human?: Human? but neither way works.

Reproduction steps

1. Create class with a field with a short form function declaration with an optional value parameter
2. Attempt to create object of class with that field,
3. Parameter correctly types, except as not optional.

Additional Notes

No response

Log File

No response

首先在 Visual Studio Code extension 中重現類別欄位範例，重點關注帶有 nullable Human 參數的簡短形式函式宣告。將它與手動加上註解的 ---@param man Human? 情況進行比較；當參數被推斷為選用參數，且如描述所示出現 nil 檢查警告時，即表示完成。