`debug.setconstant`

C closures are not supported

This function will throw an error if called on a C closure, such as print, since C closures have no accessible constants.

Mutable globals

If gameis a mutable global, the constant indexes will be different.

debug.setconstant modifies a constant at the specified index in a Luau function bytecode.

This can be used to change hardcoded behavior within functions without modifying their source code - although it requires knowing the correct constant index beforehand.

function debug.setconstant(func: (...any) -> (...any) | number, index: number, value: number | string | boolean | nil): ()

Parameters

Parameter	Description
`func`	The Lua function (or stack level) whose constant to modify.
`index`	The position of the constant to change.
`value`	The new constant value to set.

Example

Overwriting a constant string in a function
local function dummy_function()
    print(game.Name)
end

debug.setconstant(dummy_function, 4, "Players")

dummy_function() -- Output: Players