Use ember-auto-import to import npm modules

app/routes/crate/version.js

@@ -1,7 +1,7 @@
 import { observer } from '@ember/object';
 import Route from '@ember/routing/route';
 import { inject as service } from '@ember/service';
-import semver from 'semver';
+import { prerelease } from 'semver';
 
 import fetch from 'fetch';
 import ajax from 'ember-fetch/ajax';
@@ -21,7 +21,7 @@ export default Route.extend({
     const controller = this.controllerFor(this.routeName);
     const maxVersion = crate.get('max_version');
 
-    const isUnstableVersion = version => !!semver.prerelease(version);
+    const isUnstableVersion = version => !!prerelease(version);
 
     const fetchCrateDocumentation = () => {
       if (!crate.get('documentation') || crate.get('documentation').substr(0, 16) === 'https://docs.rs/') {

ember-cli-build.js

@@ -36,24 +36,5 @@ module.exports = function(defaults) {
     },
   });
 
-  // Use `app.import` to add additional libraries to the generated
-  // output files.
-  //
-  // If you need to use different assets in different
-  // environments, specify an object as the first parameter. That
-  // object's keys should be the environment name and the values
-  // should be the asset to use in that environment.
-  //
-  // If the library that you are including contains AMD or ES6
-  // modules that you would like to import into your application
-  // please specify an object with the list of modules as keys
-  // along with the exports of each module as its value.
-  app.import('node_modules/timekeeper/lib/timekeeper.js', {
-    using: [{ transformation: 'cjs', as: 'timekeeper' }],
-  });
-  app.import('node_modules/semver/semver.js', {
-    using: [{ transformation: 'cjs', as: 'semver' }],
-  });
-
   return app.toTree();
 };