\documentclass{book}
\usepackage{fullpage}
\usepackage{changepage}
\usepackage{fontspec,xltxtra,xunicode}
\setmainfont{$mainfont$}
\setsansfont{$sansfont$}
\setmonofont{$monofont$}
\defaultfontfeatures{Mapping=tex-text,Scale=MatchLowercase}

\setlength{\parindent}{0pt}
\setlength{\parskip}{12pt plus 2pt minus 1pt}
\linespread{1.2}


\usepackage{listings}
\usepackage[dvipsnames,usenames]{color}

\definecolor{lightgray}{rgb}{.95,.95,.95}
\definecolor{darkgray}{rgb}{.4,.4,.4}
\definecolor{purple}{rgb}{0.65, 0.12, 0.82}

\lstdefinelanguage{JavaScript}{
  keywords={typeof, new, true, false, catch, function, return, null, catch, switch, var, if, in, while, do, else, case, break},
  keywordstyle=\color{blue}\bfseries,
  ndkeywords={class, export, boolean, throw, implements, import, this},
  ndkeywordstyle=\color{darkgray}\bfseries,
  identifierstyle=\color{black},
  sensitive=false,
  comment=[l]{//},
  morecomment=[s]{/*}{*/},
  commentstyle=\color{purple}\ttfamily,
  stringstyle=\color{red}\ttfamily,
  morestring=[b]',
  morestring=[b]"
}

\lstset{
   language=JavaScript,
   backgroundcolor=\color{lightgray},
   extendedchars=true,
   basicstyle=\normalsize\ttfamily,
   showstringspaces=false,
   showspaces=false,
   tabsize=1,
   breaklines=true,
   showtabs=false
}

$if(fancy-enums)$
\usepackage{enumerate}
$endif$
\setcounter{secnumdepth}{-1} 

\usepackage{hyperref}
\hypersetup{
    colorlinks=true,%
    citecolor=YellowOrange,%
    filecolor=YellowOrange,%
    linkcolor=YellowOrange,%
    urlcolor=YellowOrange
}

\usepackage[compact]{titlesec}
\titlespacing{\section}{0pt}{*0}{*-2}
\titlespacing{\subsection}{0pt}{*0}{*-2}
\titlespacing{\subsubsection}{0pt}{*1}{*-2}

\begin{document}
$body$
\end{document}