This was indicated in the history file for Meteor 1.7.1
As foreshadowed in this talk about Meteor 1.7’s modern/legacy bundling system (slides), Meteor now provides an isomorphic implementation of the WHATWG fetch() API, which can be installed by running
meteor add fetch
This package is a great demonstration of the modern/legacy bundling system, since it has very different implementations in modern browsers, legacy browsers, and Node. PR #10029
Will it improve Meteor without our app directly using the fetch() API?