Module:No globals: Difference between revisions

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metawikimedia>MusikAnimal
m Protected "Module:No globals": High-risk Lua module ([Edit=Allow only autoconfirmed users] (indefinite) [Move=Allow only autoconfirmed users] (indefinite))
metawikimedia>Xaosflux
m Changed protection level for "Module:No globals": Used in interface MediaWiki:Protectedpagetext ([Edit=Require administrator access] (indefinite) [Move=Require administrator access] (indefinite))
(No difference)

Revision as of 02:29, 13 March 2019

Documentation for this module may be created at Module:No globals/doc 

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