Blog Polymer 3.0 preview: npm and ES6 Modules Today at the 2017 Polymer Summit in Copenhagen, we announced one of the biggest changes to our developer workflow in the project's history. 2017-08-22 Today at the 2017 Polymer Summit in Copenhagen, we announced one of the biggest changes to our developer workflow in the project's history. Actually, it's two changes: Polymer is moving from Bower to npm