how to read large text file approximately 10 gb in node js and check if value at each line exists in db

Question

I want to read large text file and check number at each line in my redis database so basically i have to async/await my redis command below given is my code i tried to use event-stream

function readFile()
{
return new Promise(function (resolve, reject) {
let totalLines = 0;
var s=fs.createReadStream("/var/www/uploads/"+filename);
    s.pipe(es.split())
    .pipe(
        es.map(function (line, cb) {
            cb(customFunction(line))
        })
            .on("error", function (err) {
                reject(err);
            })
            .on("end", function () { 
              resolve("ok");
            })
    );
})
}

function customFuntion(line){
 async()=>{
 var res=await redisClient.get(line);
 console.log(res)  
 }();
}

the issue is code doesn't wait for redis result instead it resolves the promise of readFile function before redis result is displayed