const GLib = imports.gi.GLib; let optionGroup = new GLib.OptionGroup();
A <structname>GOptionGroup</structname> struct defines the options in a single group. The struct has only private fields and should not be directly accessed.
All options in a group share the same translation function. Libraries which need to parse commandline options are expected to provide a function for getting a <structname>GOptionGroup</structname> holding their options, which the application can then add to its.