Clean up bundling changes & mark them ready for review

[phryneas]

Clean up bundling changes & mark them ready for review: graphql/graphql-js#4096

• assignee(s): @phryneas
  source: docs.google.com/document/d/12LM6NZxR22zBwRfihM8Vrf7uV-0gmmO5M3ooSCVS0Hs/edit#bookmark=id.maux1gqxz5vq

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Note: Action Item issues are reviewed and closed during Working Group
meetings.

[phryneas]

Note: I didn't forget about this, but am moving house right now. I'll probably have to postpone this until after the next WG meeting.

[phryneas]

Ready for review comments now :)