SSJS and WSProxy code to return all valid users in a Marketing Cloud instance

SSJS Get all Users

<script runat="server">
/*Code provided as is without warranty - make sure you understand what this code does before using it - use at your own risk*/
Platform.Load("Core","1");
try {
  var prox = new Script.Util.WSProxy();
  //================== https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/accountuser.html
  var cols = ["Name","CustomerKey","NotificationEmailAddress", "UserID", "ActiveFlag", "Email", "IsAPIUser", "AccountUserID", "LastSuccessfulLogin", "CreatedDate", "Roles"];
  //================= https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/ssjs_WSProxy_basic_retrieve.html
  var filter = {
    LeftOperand: {Property: "Email",SimpleOperator: "like",Value: "@"},
    LogicalOperator: "AND",
    RightOperand: {Property: "ActiveFlag",SimpleOperator: "equals",Value: "true"}
  };
  var res = prox.retrieve("AccountUser", cols, filter);
  Write(Stringify(res.Results)+"<br><br><br>");

    Write("<table border=1><tr><th>Name</th><th>Email</th><th>CreatedDate</th><th>LastSuccessfulLogin</th><th>Roles</th></tr>");
    for (i = 0; i < res.Results.length; i++) {
      Write("<tr><td>" + res.Results[i].Name + "</td><td>" + res.Results[i].Email + "</td><td>" + res.Results[i].CreatedDate + "</td><td>" + res.Results[i].LastSuccessfulLogin + "</td><td>");
      for (r = 0; r < res.Results[i].Roles.length; r++) {
        Write(res.Results[i].Roles[r].Name + "<br>");
      }
    Write("</td></tr>");
    }
  Write("</table>"); 
  }
catch(error) {
  Write('Message: ' + error);
}
</script>