code: function (config) {
      this.stripDatePII = false
      if (typeof config.stripDatePII !== 'undefined') {
        this.stripDatePII = (config.stripDatePII === true)
        // remove the option so we don't pass it to other trackers - it's not
        // their concern
        delete config.stripDatePII
      }
      this.stripPostcodePII = false
      if (typeof config.stripPostcodePII !== 'undefined') {
        this.stripPostcodePII = (config.stripPostcodePII === true)
        // remove the option so we don't pass it to other trackers - it's not
        // their concern
        delete config.stripPostcodePII
      }
      this.trackers = []
      if (typeof config.universalId !== 'undefined') {
        var universalId = config.universalId
        delete config.universalId
        this.trackers.push(new GOVUK.GoogleAnalyticsUniversalTracker(universalId, config))
      }
      if (typeof config.govukTrackerUrl !== 'undefined') {
        var govukTrackerUrl = config.govukTrackerUrl
        delete config.govukTrackerUrl
        this.trackers.push(new GOVUK.GOVUKTracker(govukTrackerUrl))
      }
    }
docs: For usage and initialisation see: https://github.com/alphagov/govuk_frontend_toolkit/blob/master/docs/analytics.md#create-an-analytics-tracker