How to configure the search path for typelibs?

[Thomas Bollmeier <TBollmeier web de>]

Hi gjs-experts,

currently I dive into the topic of gobject-introspection and its use in 
JavaScript. So far I have been able to add introspection support to my 
sample GObject demo application and created .gir and .typelib files. Now 
I would like to call my demo object from gjs. The typelib file had been 
installed to a test install path (lets assume it is 
/home/user_name/opt/mydemo/lib/girepository-1.0/Demo-0.1.0.typelib).
Is there any environment variable or option for gjs to make this typelib 
path known to GJS so that a statement "const Demo = imports.gi.Demo;" 
would work within gjs?

Regards,
Thomas