alias(alias, original) {
        mixpanel.alias(alias, original);
      }
The alias method creates an alias which Mixpanel will use to remap one id to another. Multiple aliases can point to the same identifier.
@link https://developer.mixpanel.com/docs/javascript-full-api-reference#mixpanelalias

@param  {string} [alias] - A unique identifier that you want to use for this user in the future.
@param  {string} [original] - The current identifier being used for this user.