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ମଡ୍ୟୁଲ:No globals

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This module causes an error if any nil global is read or if any global is written to, with the exception of arg, and temporarily, name. To use, add

require('Module:No globals')

to the top of the module using it. The arg variable is excluded because it is necessary for Scribunto's require function to work properly. (See the Scribunto source code here.)

local mt = getmetatable(_G) or {}
function mt.__index (t, k)
	if k ~= 'arg' then
		error('Tried to read nil global ' .. tostring(k), 2)
	return nil
function mt.__newindex(t, k, v)
	if k ~= 'arg' then
		error('Tried to write global ' .. tostring(k), 2)
	rawset(t, k, v)
setmetatable(_G, mt)