Meteor Angular2 - MAIL_URL question

In my server/main.ts file I set the MAIL_URL in the Meteor.startup:

Meteor.startup(() => {
   process.env.MAIL_URL = "smtp://account:password@host:port;

And I get an error: [ts] Cannot find name ‘process’.
Does anyone know what library I need to import?
Generallly speaking, how can I figure out which packages I need to import when this occurs?


did you get an answer?