google apps script for gmail to auto move totrash (run daily)

Code.gs

function cleanUpAll(){
  clean7DaysAutoPrune();
  clean6MonthsAutoPrune();
  clean1YearAutoPrune();
}

function clean7DaysAutoPrune(){
  cleanUpWithParams(7,'auto-prune/auto-prune-7d');
}

function clean6MonthsAutoPrune(){
  cleanUpWithParams(182,'auto-prune/auto-prune-6mo');
}

function clean1YearAutoPrune(){
  cleanUpWithParams(365,'auto-prune/auto-prune-1yr');
}

function cleanUpWithParams(delayDays,labelName) {
  if(typeof delayDays!=='number'){
    return false;
  }
  if(typeof labelName !== 'string'){
    return false;
  }
  labelName=labelName.trim();
  if(labelName.length<3){
    return false;
  }
  var maxDate = new Date();
  maxDate.setDate(maxDate.getDate()-delayDays);
  var label = GmailApp.getUserLabelByName(labelName);
  if(typeof(label)!=='object'){
    console.error('could not read label '+labelName);
    return 1;
  }
  var threads = label.getThreads();
  var maxThreads = 1000;
  let lastDate;
  for (var i=0; i < threads.length; i++){
    if(i<=maxThreads){
      try {
        lastDate=threads[i].getLastMessageDate();
      }catch(err){
        lastDate=undefined;
      }
      if(typeof(lastDate)!=='undefined'){
        if(threads[i].getLastMessageDate() < maxDate) {
          try{
            threads[i].moveToTrash();
            threads[i].removeLabel(label);
            console.log('thread '+i+' / '+maxThreads+': deleted ') //,threads[i].getFirstMessageSubject(),' ',lastDate);
          }catch(error){
            console.log('thread '+i+' / '+maxThreads+': error',error);
          }
        }else{
          console.log('thread '+i+' / '+maxThreads+': skipped '); //,threads[i].getFirstMessageSubject(),' ',lastDate);      
        }
      } else {
        try{
          console.error('could not get last date of',i,'/',maxThreads,': ',threads[i].getFirstMessageSubject());
        }catch(erx){
          console.error('could not get last date or email subject of',i,'/',maxThreads,': ',threads[i].getId(),erx);
        }
      }
    }
  } 
}