a promisified version of setTimeout

index.ts

// ref: https://mrcoles.com/implementing-sleep-javascript-promise/

const sleep = (delay, resolveValue) => new Promise((resolve) => {
  setTimeout(() => resolve(resolveValue), delay);
});

const sleep = <T extends any>(
  delay: number,
  resolveValue?: T
): Promise<T> =>
  new Promise((resolve) => {
    setTimeout(() => resolve(resolveValue), delay);
  });
  
await sleep(1000); // sleep for 1 second