Documentation Index
Fetch the complete documentation index at: /llms.txt
Use this file to discover all available pages before exploring further.
Replaces one upvalue in a Lua function or stack level by one-based index. Invalid stack levels raise “Level out of range”, non-Lua functions raise “Lua function expected”, indexes below 1 raise “Upvalue index starts at 1”, and indexes past the available upvalues raise “Upvalue index is out of range”. debug.setupvalue is an alias.
setupvalue(target: function | number, index: number, value: any)
debug.setupvaluelocal captured = "before"
local function target()
return captured
end
print(target())
setupvalue(target, 1, "after")
print(target())
debug.setupvalue(target, 1, "done")
print(target())