This is Lua 5.4.7 with a bit of syntactic sugar.
Expression-body function declaration:
Whenever an expression is expected > *expression* works like function() return *expression* end. There is an optional ; after the expression. Mainly it allows for C# like variable => *expression* syntax.
For now .> token can also be used because while being a syntax error its not showing up as such with LuaLS. This might be a temporary hack that later will be replaced with a LuaLS plugin
For installation instructions, license details, and further information about Lua, see doc/readme.html.