debug.setupvaluename Synchronous

Change the debug name stored for one upvalue slot. This only changes metadata, which can make inspected closures easier to understand.

Syntax

Luau

debug.setupvaluename(target: Function | number, index: number, name: string) -> ()

Parameters

Function parameters
Parameter	Type	Description
`target`	`Function \| number`	A Luau function or visible stack level.
`index`	`number`	One-based named upvalue slot.
`name`	`string`	New name to display in debug metadata.

()

No value.

A slot without an upvalue debug name cannot be renamed and raises an error.

Luau

local count = 0
local function nextCount() count += 1; return count end
debug.setupvaluename(nextCount, 1, "total")
print(nextCount()) -- 1