No background.js in the Calendar directory of Jidesha source-code

Dear All,
I try to modify the Jidesha source code to point to our media server. Then I observe that there is no file backround.js in the extension calendar of the jidesha project. In the extension Sharing desktop (chrome directory of this project), I do see the background.js. Does it imply that 2 extensions use the same background.js ?
If not would you please send me / commit the missing file
Many thanks

It is actually one extension. You can create and install extension providing Sharing desktop only, which is no longer needed, or you can install an extension providing Sharing desktop and calendar integration. Everything is managed by https://github.com/jitsi/jidesha/blob/master/calendar/make.sh

Thank you @damencho. I will check it out.
Best regards