const separateResults = <T>(items: PromiseSettledResult<T>[]) => {
  const successfulItems = items
    .filter(
      (item): item is PromiseFulfilledResult<T> => item.status === "successful"
    )
    .map((item) => item.value);

  const failedItems = items.filter(
    (item): item is PromiseRejectedResult => item.status === "failed"
  );

  ...
};

const separateResults = <T>(items: PromiseSettledResult<T>[]) => {
  const successfulItems = items
    .filter(
      (item): item is PromiseFulfilledResult<T> => item.status === "successful"
    )
    .map((item) => item.value);

  const failedItems = items.filter(
    (item): item is PromiseRejectedResult => item.status === "failed"
  );

  ...
};

const separateResults = (items: PromiseSettledResult<unknown>[]) => {
  const successfulItems: unknown[] = [];
  const failedItems: unknown[] = [];

  for (const item of items) {
    if (item.status === "successful") {
      successfulItems.push(item.value);
    } else if (item.status === "failed") {
      failedItems.push(item.reason);
    }
  }

  ...
};

const separateResults = (items: PromiseSettledResult<unknown>[]) => {
  const successfulItems: unknown[] = [];
  const failedItems: unknown[] = [];

  for (const item of items) {
    if (item.status === "successful") {
      successfulItems.push(item.value);
    } else if (item.status === "failed") {
      failedItems.push(item.reason);
    }
  }

  ...
};