It probably does not contain a lot of es6 syntax, and the let keyword probably occurs a lot more in other languages (Swift, Haskell, Lua). You could try to add

It probably does not contain a lot of es6 syntax, and the let keyword probably occurs a lot more in other languages (Swift, Haskell, Lua). You could try to add more code to disambiguate it, for example adding a semicolon already displays it as second.