I'm reading csv file and do some processing but with this processing the other method get called and I'm getting error for that. so I want to execute return method after all process done. please help. thanks.

async  function createcsv(data){
try{
const stream = Readable.from(data.buffer)
        const data1 = stream
          .pipe(csv())
          .on("data", async (data) => results.push(data))
          .on("end", async () => {
               //doing some process 
             }
return {
status:"success"
message:"created csv"
file:filename
}
}catch(err){
console.log(err)
}
}

so the return method execute early and I didn't get file name which I'm processing inside stream so I want execute return method at the end and also get the file name because I'me processing thousand of csv file data. please help