@dword-design/defu/dist/index.js

import { createDefu as createDefuFromDefu } from "defu";
const arrayMerger = (obj, key, value) => {
  if (Array.isArray(obj[key]) && Array.isArray(value)) {
    obj[key].push(...value);
    return true;
  }
  return false;
};
export default createDefuFromDefu(arrayMerger);
export const createDefu = merger => createDefuFromDefu((obj, key, value) => {
  if (merger(obj, key, value)) {
    return true;
  }
  return arrayMerger(obj, key, value);
});