Difference between revisions of "Module:No globals"

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test>Mattflaschen-WMF
m (Reverted edits by 108.173.191.133 (talk) to last revision by Hashar)
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Line 1: Line 1:
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)
 

Revision as of 06:45, 17 June 2018

This module causes an error if any nil global is read or if any global is written to, with the exception of arg. 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.)

See also