This module causes an error if any nil global is read or if any global is written to, with the exception of <var>arg</var>. To use, add <syntaxhighlight lang="lua" inline>require('Module:No globals')</syntaxhighlight> to the top of the module using it. The <var>arg</var> variable is excluded because it is necessary for Scribunto's [[mw:Extension:Scribunto/Lua reference manual#require|require]] function to work properly. (See the Scribunto source code [https://gitphabricator.wikimedia.org/blobdiffusion/mediawiki%2Fextensions%2FScribuntoELUA/f768b950134a6a32c094be92c8c139a11f8880dfbrowse/master/engines%2FLuaCommon%2Flualib%2Fpackage/LuaCommon/lualib/package.lua#L101;f768b950134a6a32c094be92c8c139a11f8880df$101 here].)