const delay = (val) => Promise.resolve(val);

async function pipeline(input) {
  const result = await delay(input)
    .then((v) => v * 2)
    .then((v) => v + 10)
    .then((v) => {
      if (v > 20) throw new Error(`Too large: ${v}`);
      return v;
    })
    .catch((e) => `Caught: ${e.message}`)
    .then((v) => (typeof v === "string" ? v.toUpperCase() : v * 3));

  return result;
}

Promise.all([pipeline(4), pipeline(8)]).then(([a, b]) => {
  console.log(a);
  console.log(b);
});