generate both an article and slide-deck from the same tex file using beamerswitch.

texJanus.tex

\documentclass[%
  article,
  % beamer,
  beameroptions={ignorenonframetext,14pt},
  articleoptions={a4paper,12pt},
  also={trans,handout,article}
  ]{beamerswitch}
\handoutlayout{nup=3plus,border=1pt}
\articlelayout{maketitle,frametitles=none}
\mode<article>{\usepackage[hmargin=2cm,vmargin=2cm]{geometry}}
\mode<beamer>{
  \usecolortheme{metropolis}
  \beamertemplatenavigationsymbolsempty
}

\title{Article and Slides}
\subtitle{\texttt{beamerswitch} is magic}
\author{Apoorva Lal}
\date{\today}

\begin{document}
\begin{frame} \maketitle \end{frame}

This very brief demonstration shows how to use the
\textsf{beamerswitch} class. It allows easy switching between four
\textsf{beamer} modes:

\begin{frame}{Beamer modes}
  \begin{itemize}[<+->]
    \item \textbf{beamer:} regular slides
    \item \textbf{handout:} slides suitable for printing on paper
  \end{itemize}
\end{frame}

Notice how the text outside frames is only shown in article mode. Also,
This PDF also has title and author information saved in the metadata (look
at the properties in your PDF viewer).
Happy {\LaTeX}ing!

\end{document}