debug.getinfo

debug.getinfo(func_or_level: function | number, what: string?) -> table

local function myFunc()
    return "hello"
end

local info = debug.getinfo(myFunc)
print("Name:", info.name)
print("Source:", info.short_src)
print("Line defined:", info.linedefined)

-- Get info for current function
local currentInfo = debug.getinfo(1)
print("Current function:", currentInfo.name)