'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

function isObject(value) {
  return value !== null && typeof value === "object";
}
function _defu(baseObject, defaults, namespace = ".", merger) {
  if (!isObject(defaults)) {
    return _defu(baseObject, {}, namespace, merger);
  }
  const object = Object.assign({}, defaults);
  for (const key in baseObject) {
    if (key === "__proto__" || key === "constructor") {
      continue;
    }
    const value = baseObject[key];
    if (value === null || value === void 0) {
      continue;
    }
    if (merger && merger(object, key, value, namespace)) {
      continue;
    }
    if (Array.isArray(value) && Array.isArray(object[key])) {
      object[key] = [...value, ...object[key]];
    } else if (isObject(value) && isObject(object[key])) {
      object[key] = _defu(
        value,
        object[key],
        (namespace ? `${namespace}.` : "") + key.toString(),
        merger
      );
    } else {
      object[key] = value;
    }
  }
  return object;
}
function createDefu(merger) {
  return (...arguments_) => (
    // eslint-disable-next-line unicorn/no-array-reduce
    arguments_.reduce((p, c) => _defu(p, c, "", merger), {})
  );
}
const defu = createDefu();
const defuFn = createDefu((object, key, currentValue) => {
  if (typeof object[key] !== "undefined" && typeof currentValue === "function") {
    object[key] = currentValue(object[key]);
    return true;
  }
});
const defuArrayFn = createDefu((object, key, currentValue) => {
  if (Array.isArray(object[key]) && typeof currentValue === "function") {
    object[key] = currentValue(object[key]);
    return true;
  }
});

exports.createDefu = createDefu;
exports.default = defu;
exports.defu = defu;
exports.defuArrayFn = defuArrayFn;
exports.defuFn = defuFn;