async doSomethingWithBigArray(bigArray) {
  const arrayBatch = [];
  const batchSize = 30;
  while (bigArray.length > 0) arrayBatch.push(bigArray.splice(0, batchSize));

  for (let i = 0; i < arrayBatch.length; i++) {
    const batch = arrayBatch[i];
    await Promise.all(batch.map(async (arrayItem) => {
      await this.doSomethingWithItem(arrayItem);
    }));

    bigArray.push(...batch);
  }

  return bigArray;
}