/**
 * Concatenates each chunk of a string iterator to a buffer and yields the buffer when the input iterator is done
 * @param it - The input iterator
 */
export async function* concatStr(it: AsyncIterableIterator<string>): AsyncIterableIterator<string> {
  let buf = ''
  for await (const chunk of it) {
    buf += chunk
  }
  yield buf
}