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

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

  compute([value], options) {
    return this.units.formatSpeed(value, options);
  },
});

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);
  },
});

Use `ember-intl` helper base class