How to bulid ember application without ES2015?

Hey, I use ember js in my latest projects, But I use v1.10 Now I want to create new projects with v2.9 Does it’s possible to create ember js application with old pure js? not ES2015 ?

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Not using ember-cli is rowing against the current but I think you could use Ember.js with rollup to get an ES5 only project. It would be very much a Roll Your Own project.