Run async functions in parallel with limited amout of concurrency.

inParallelWithLimit.js

async function inParallelWithLimit(list, concurrency, fn) {
  // chunk is imported from here :- https://gist.github.com/Deepak13245/129ecdbb72c9f0f81827eb421260a8da
  const batches = chunk(list, concurrency);
  
  // Process batches in series
  // inSeries :- https://gist.github.com/Deepak13245/c39c67c45abbf5d2a357fba5beeabbde
  // inParallel :- https://gist.github.com/Deepak13245/e49c1853ebceacbd3ab6f725c42b4ba6
  const data = await inSeries(batches, async (items, batch) => {
      // Process items in a batch in parallel
      return inParallel(items, fn);
  });
  
  // Flatten the array
  return data.reduce((acc, items) => [...acc,...items], []);
}