`process = {env: {}}` leaking into production builds

[t3dotgg]

Hey guys!

Just spent a lot of time fighting an obscure bug that was introduced to our code base when we added pubnub/react as a dependency. I've done a thorough investigation and am confident that the ts-invariant dependency is the issue. I've already raised it with @benjamn and friends over there, but thought y'all might want to know too :)

Link to the related issue on ts-invariant apollographql/invariant-packages#107

[t3dotgg]

Two PRs linked above are the different solutions to the issue I had. One is an update, one is a removal :)