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.)
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)
