/**
 * Traite un tableau d'items avec au plus `concurrency` appels simultanés.
 * @param {any[]} items
 * @param {(item: any) => Promise<void>} processFn
 * @param {number} concurrency
 * @returns {Promise<void>}
 */
export async function processBatch(items, processFn, concurrency = 3) {
  const queue = [...items];
  const workers = Array.from({ length: concurrency }, async () => {
    while (queue.length > 0) {
      const item = queue.shift();
      if (item !== undefined) await processFn(item);
    }
  });
  await Promise.all(workers);
}