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While Babel 7 seems to work perfectly well, and the process of upgrading has been useful, the upgrade is going to require Meteor developers to update the babel-runtime npm package and their .babelrc plugins, a chore with which Meteor can't help very much. On top of that, Babel 7 is still in early beta. I don't want to ship Meteor 1.6 with a critical component that could change in unexpected ways, and I don't want to wait for Babel 7 to be finalized to ship Meteor 1.6. Note that the Meteor command-line tool is still implemented using Babel 7, which has historically been a great way to gain confidence in Babel-related changes before pushing them out to all Meteor developers. @GeoffreyBooth This should take some pressure off the CoffeeScript upgrade for now. Let's aim for Meteor 1.6.1 for Babel 7 and CoffeeScript 2.0.