ember-simple-auth 1.4.0 create a strange file when I "ember build -prod"

I switched from 1.3.0 to 1.4.0 and now when I ember build -prod I have a new file in:

dist/ember-fetch/fastboot-fetch-a4c28b6b7b24781cc7616fb44c1def25.js:

(function(){define('fetch',['exports'],function(a){var b=FastBoot.require('node-fetch');a['default']=b,a.Headers=b.Headers,a.Request=b.Request,a.Response=b.Response}),define('fetch/ajax',['exports'],function(){throw new Error('You included fetch/ajaxbut it was renamed toember-fetch/ajax')})})();

Why this?

I don’t want this file in my prod dist folder.

I’m not using fastboot.

[tchak]

After some thought there may be a solution. If ember-fetch could know if ember-fastboot is installed it could decide to include or not the file in the public folder. I am wondering if the pattern of requiring a fastboot specific implementation is something we expect to become idiomatic and used in lots of addons? If it is the case, maybe it worth resolving? cc @rwjblue @kratiahuja

[xm]

In other words: if my app is not using fastboot, how do I avoid this step ever happening? Is there a flag to set, or can a change be made in ember-fetch to detect fastboot?