Duplicate users by email address

dupeUsers.jql

/**
 * Duplicate People Profile Check
 * Originally by Mixpanel
 * Updated by tdwright 09/01/19
**/

var matchKey = "$email";
function main() {
  return People()
  .filter(function(user){
    return user.properties[matchKey] || 
    user.distinct_id == user.properties[matchKey] ||
    user.distinct_id == encodeURIComponent(user.properties[matchKey]);
  })
  .map(function(user) {
    return {
      distinct_id : user.distinct_id,
      match_key : user.properties[matchKey] ? 
      user.properties[matchKey] : ((user.distinct_id == user.properties[matchKey] ||
        user.distinct_id == encodeURIComponent(user.properties[matchKey])) ? user.distinct_id : "")
    };
  })
  .groupBy(["match_key"], function(accums, users) {
    var holder = {profiles: []};
      _.each(accums, function(v) {
        _.each(v.profiles, function(profile) {
          holder.profiles.push(profile);
        });
      });
    _.each(users, function(v) {
      holder.profiles.push(v.distinct_id);
    });
    return holder;
  })
  .filter(function(user){
    return user.value.profiles && user.value.profiles.length >= 2;
  })
  .map(function(user) {
    return {
      "email": user.key[0],
    "profiles" : user.value.profiles
    }
  })
  .sortDesc('regDate');
}