Ember Dev is a gem for developing Ember.js packages. The initial goal is to share tooling between Ember Core and Ember Data. The second goal is to provide tooling for developers seeking to develop packages for Ember. (This is not intended to be a tool for developing Ember applications.)
Unfortunately, this project isn't yet in a state where we can recommend public use. We're lacking a few important features such as generators that are required for general ease of use. If you're interested in helping improve this project, please let us know and we can give you some direction of where help is needed.
A big thanks to CrowdStrike for supporting the initial work necessary to extract this code from the Ember repos.