GLib.get_prgname

function get_prgname(): String {
    // Gjs wrapper for g_get_prgname()
}
  

Gets the name of the program. This name should not be localized, in contrast to GLib.get_application_name.

If you are using GDK or GTK+ the program name is set in gdk_init(), which is called by gtk_init(). The program name is found by taking the last component of @argv[0].