import { inject as service } from '@ember/service';

import BaseHelper from 'ember-intl/helpers/-format-base';

export default BaseHelper.extend({
  units: service(),

  format(value, options) {
    return this.units.formatSpeed(value, options);
  },
});

@@ -124,47 +124,52 @@
 ult 
-BaseHelper.extend(%7B%0A  units: service(),
+class extends BaseHelper %7B%0A  @service units;
 %0A%0A  
@@ -251,10 +251,7 @@
 %0A  %7D
-,
 %0A%7D
-);
 %0A

Convert to ES6 class