No js module dbus found in search path

[jwermuth]

System: Ubuntu 17.10
Gnome-shell 3.26.1

Prerequisites
I have other gnome extensions installed, and I can install new ones, aka gnome extensions are working

Steps to reproduce

• go to extensions.gnome.org
• search for 'presentation mode'
• select this extension
• expected - the extension is activated
• actual - an error occured loading the extension

Searching for root cause

• open lg (looking glass)
• select 'extensions' at the top right corner
• find 'presentation mode' in the list
• click show errors
• observe "no module dbus found in search path"

Googling told me that the dbus has been deprecated since gnome ... something earlier than the version I have. I found some coding examples that will fix this particular error:
replace

const DBus = imports.dbus;

with

const DBus = Gio.DBus;

and then the code runs a little further, before it bumps into the next error
no js module usermenu found is search path
Looking in the code, in metadata.js I see that the gnome-shell version is 3.2 (and mine is 3.26.1) I am guessing that the both errors is due to me using more recent version of gnome-shell, and that a possible fix would be to update it to the more recent version (or write code that handles both).