Timeout routine as Lambda handler.

lambda.js

'use strict';

function timeout(ms) {
  console.log('timeout start');

  return new Promise(resolve => {
    setTimeout(() => {
      console.log(`timeout cb fired after ${ms} ms`);

      resolve();
    }, ms);
  });
}

async function main() {
  console.log('main start');

  timeout(5e3);

  console.log('main end');
}

exports.handler = main;