The way Ember is currently built (there’s a big project underway called Embroider that will overhaul the build system to use webpack or rollup and improve a lot of the ergonomics around this stuff) it is only aware of ember addons and not arbitrary javascript modules. Ember auto import can help for loading “non-Ember” dependencies, or the “classic” way is to just import the files in your ember-cli-build.js file so they are included in the build. That would look something like: