getUserEmail

function getUserEmail() {
  return getStorageValue('apiHost'
  ).then(function (result) {
    return fetch(result.apiHost + 'api/get_user_email',
      {credentials:'include'}
    ).then(function (response) {
      if (response.ok) {
        return response.json()
      }
      return response.json().then(function (json) {
        throw json
      });
    }).then(function (data) {
      return data.user_email
    }
    ).catch(function (error) {
      console.warn(error)
    });
  });
}