Difference between revisions of "Module:No globals"
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(Created page with "local mt = getmetatable(_G) or {} function mt.__index (t, k) if k ~= 'arg' then -- perf optimization here and below: do not load Module:TNT unless there is an error error...") |
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Revision as of 16:08, 14 June 2019
This module causes an error if any nil global variable 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.
local mt = getmetatable(_G) or {}
function mt.__index (t, k)
if k ~= 'arg' then
-- perf optimization here and below: do not load Module:TNT unless there is an error
error(require('Module:TNT').format('I18n/No globals', 'err-read', tostring(k)), 2)
end
return nil
end
function mt.__newindex(t, k, v)
if k ~= 'arg' then
error(require('Module:TNT').format('I18n/No globals', 'err-write', tostring(k)), 2)
end
rawset(t, k, v)
end
setmetatable(_G, mt)