Luacheck is a static analyzer and a linter for Lua. Luacheck detects various
issues such as usage of undefined global variables, unused variables and values,
accessing uninitialized variables, unreachable code and more.

Luacheck supports checking Lua files using syntax of Lua 5.1, Lua 5.2, Lua 5.3
and LuaJIT.

WWW: https://github.com/luarocks/luacheck