Luacode in NewDocumentEnvironment problem

Question

I want to put some systematic code at beginning and at the end of a luacode environment.

Why this doesn't work.

\documentclass{article}

\usepackage{xparse,luacode}

\NewDocumentEnvironment{LTG}{%
        \begin{luacode}
    }{%
        \end{luacode}
}

\begin{document}

essai

\end{document}

Answer 1

\NewDocumentEnvironment needs at least an empty {} argument specifier -- this is missing in the OP.

The classical \newenvironment does not require the classical argument specifier brackets [] at all, it can be omitted then.

The error here would occur with basically any code following the environment name bracket, i.e. {LTG}, making xparse believe, that \begin{luacode} is the argument specifier, which must fail here of course.

\documentclass{article}

\usepackage{xparse,luacode}

\NewDocumentEnvironment{LTG}{}{%
 \begin{luacode}
 }{%
  \end{luacode}
 }

\begin{document}

essai

\end{document}