debug.validlevel Synchronous

Check whether a stack level exists before inspecting it. This is useful in tracing code where callers may have different depths.

Syntax

Luau

debug.validlevel(level: any, targetThread: thread?) -> boolean

Parameters

Function parameters
Parameter	Type	Description
`level`	`any`	Stack depth to test.
`targetThread`	`thread?`	Optional coroutine whose stack should be checked.

boolean

true if that level is valid; false for a missing or invalid level.

Luau

local function inspect()
    if debug.validlevel(1) then
        print(debug.getinfo(1).source)
    end
end
inspect()