debug.getupvalue - Byte Documentation

debug.getupvalue(target: function | number, index: number): any

Aliases

function | number

required

The function to inspect, or a positive stack level identifying a caller.

number

required

A 1-based slot index.

any

The captured value at the selected upvalue index.

Non-positive/out-of-bounds indexes raise. Compiler choices determine upvalue layout. Related types: Debug types & behavior.

local captured = {value = 1}
local function sample() return captured.value end
print(debug.getupvalue(sample, 1))