\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{animals}[2019/11/30 v1.2.1 (NLCT) Sample package to test tracklang.sty]

\RequirePackage{tracklang}[2019/11/30]

\DeclareOption*{%
 \TrackIfKnownLanguage{\CurrentOption}%
 {\PackageInfo{animals}{Tracking language `\CurrentOption'}}% successful
 {% failed
   \PackageError{animals}%
   {Unknown language specification `\CurrentOption'}%
   {You need to supply either a known dialect label or a valid language tag}%
 }%
}
\ProcessOptions


% default definitions
\newcommand\catname{cat}
\newcommand\dogname{dog}
\newcommand\ladybirdname{bishy-barney-bee}

\AnyTrackedLanguages
{%
  \ForEachTrackedDialect{\this@dialect}{%
    \TrackLangRequireDialect{animals}{\this@dialect}%
  }%
}
{% no tracked languages, default already set up
}

\endinput