How to get current Users Email ID in GMAIL ADDONS

Question

I am learning to make gmail addons. But I am stuck at a point on how to access email address value of user who using addons.

After Reading I get that I will need this permission https://www.googleapis.com/auth/userinfo.email

But how to actually get email address when user opens addon in Gmail

Please can anybody help me on this

Answer 1

This seems to work:

var emailAddress = Session.getEffectiveUser().getEmail();