Autoincrement serial number for wix custom form submission

[_Warakaulle]

@J.D

//backend/data.js
///top line:
import wixData from 'wix-data';
///

export async function CollctionName_beforeInsert(item, context){
let prevSerialId = 'ABC00000';
if(!item.serialId){
const prevItemQuery = await wixData.query('CollctionName').isNotEmpty('serialId').limit(1).descending('serialId').distinct('serialId');
const items = prevItemQuery.items; 
if(items.length){
prevSerialId = items[0];
}
} else {
prevSerialId = item.serailId;
}
const nextNumber = Number(prevSerialId.replace('ABC', '')) + 1;//this one will remove the 'ABC' and process the number itself and will add plus one;
item.serailId = 'ABC' + nextNumber.toString().padStart(5,'0');
try {
return item;
} catch(err) {
  return err.errorCode === 'WDE0123' ? CollctionName_beforeInsert(item, context) : Promise.reject(err)
}
}

Can I get a help same issue like this?