promise.js

const promiseWithTimeout = (timeoutMs, promise, failureMessage) => { 
  var timeoutHandle;
  const timeoutPromise = new Promise((resolve, reject) => {
    timeoutHandle = setTimeout(() => reject(new Error(failureMessage)), timeoutMs);
  });

  return Promise.race([ 
    promise, 
    timeoutPromise, 
  ]).then((result) => {
    clearTimeout(timeoutHandle);
    return result;
  }); 
}

let pa = new Promise((res, rej) => {
    setTimeout(() => {
        console.log('now it goes');
        res("short")
    }, 3000);
});
let pb = new Promise((res, rej) => {
    setTimeout(() => res("long"), 5000);
});

promiseWithTimeout(1000, pa, "FalowA").then(r => console.log(r)).catch(e => console.log(e));

// promise will continue to run even after race returns a winning promise.