ember fetch service

import Service from '@ember/service';
import fetch from 'fetch';

export default Service.extend({
  session: service(),

  request({ url, method, cache, headers = {}, contentType, body } = {}) {
    headers = this._processHeaders(headers);
    return fetch(url, {
      method,
      cache,
      headers,
      contentType,
      body
    });
  },
  
  headers: computed('session.data.authenticated.access_token', function() {
    const token = this.session.data.authenticated.access_token;
    return token ? { 'Authorization': `Bearer ${token}` } : {};
  }),

  _processHeaders(headers) {
    return Object.assign({}, this.headers, headers);
  }
});