// src/lib/deepMerge.ts
var UNSAFE_KEYS = /* @__PURE__ */ new Set(["__proto__", "constructor", "prototype"]);
function isPlainObject(value) {
  if (typeof value !== "object" || value === null) return false;
  const proto = Object.getPrototypeOf(value);
  return proto === Object.prototype || proto === null;
}
function isMergeable(value) {
  return Array.isArray(value) || isPlainObject(value);
}
function cloneValue(value) {
  if (Array.isArray(value)) {
    return value.map((item) => cloneValue(item));
  }
  if (isPlainObject(value)) {
    const result = {};
    for (const [key, item] of Object.entries(value)) {
      if (UNSAFE_KEYS.has(key)) continue;
      result[key] = cloneValue(item);
    }
    return result;
  }
  return value;
}
function mergeObject(target, source, options) {
  const destination = {};
  if (isPlainObject(target)) {
    for (const [key, item] of Object.entries(target)) {
      if (UNSAFE_KEYS.has(key)) continue;
      destination[key] = cloneValue(item);
    }
  }
  for (const [key, sourceValue] of Object.entries(source)) {
    if (UNSAFE_KEYS.has(key)) continue;
    if (Object.hasOwn(target, key) && isMergeable(sourceValue)) {
      const customMerge = options.customMerge?.(key);
      destination[key] = (customMerge ?? deepMerge)(target[key], sourceValue, options);
    } else {
      destination[key] = cloneValue(sourceValue);
    }
  }
  return destination;
}
function deepMerge(target, source, options = {}) {
  const isSourceIsArray = Array.isArray(source);
  const isTargetIsArray = Array.isArray(target);
  if (isSourceIsArray !== isTargetIsArray) {
    return cloneValue(source);
  }
  if (isSourceIsArray) {
    return [...target, ...source].map((item) => cloneValue(item));
  }
  return mergeObject(target, source, options);
}
export {
  deepMerge
};
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