'use strict';

function _unsupportedIterableToArray(o, minLen) {
  if (!o) return;
  if (typeof o === "string") return _arrayLikeToArray(o, minLen);
  var n = Object.prototype.toString.call(o).slice(8, -1);
  if (n === "Object" && o.constructor) n = o.constructor.name;
  if (n === "Map" || n === "Set") return Array.from(o);
  if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen);
}
function _arrayLikeToArray(arr, len) {
  if (len == null || len > arr.length) len = arr.length;
  for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i];
  return arr2;
}
function _createForOfIteratorHelperLoose(o, allowArrayLike) {
  var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"];
  if (it) return (it = it.call(o)).next.bind(it);
  if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") {
    if (it) o = it;
    var i = 0;
    return function () {
      if (i >= o.length) return {
        done: true
      };
      return {
        done: false,
        value: o[i++]
      };
    };
  }
  throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}

function shallow$1(objA, objB) {
  if (Object.is(objA, objB)) {
    return true;
  }
  if (typeof objA !== 'object' || objA === null || typeof objB !== 'object' || objB === null) {
    return false;
  }
  if (objA instanceof Map && objB instanceof Map) {
    if (objA.size !== objB.size) return false;
    for (var _iterator = _createForOfIteratorHelperLoose(objA), _step; !(_step = _iterator()).done;) {
      var _step$value = _step.value,
        key = _step$value[0],
        value = _step$value[1];
      if (!Object.is(value, objB.get(key))) {
        return false;
      }
    }
    return true;
  }
  if (objA instanceof Set && objB instanceof Set) {
    if (objA.size !== objB.size) return false;
    for (var _iterator2 = _createForOfIteratorHelperLoose(objA), _step2; !(_step2 = _iterator2()).done;) {
      var _value = _step2.value;
      if (!objB.has(_value)) {
        return false;
      }
    }
    return true;
  }
  var keysA = Object.keys(objA);
  if (keysA.length !== Object.keys(objB).length) {
    return false;
  }
  for (var _i = 0, _keysA = keysA; _i < _keysA.length; _i++) {
    var keyA = _keysA[_i];
    if (!Object.prototype.hasOwnProperty.call(objB, keyA) || !Object.is(objA[keyA], objB[keyA])) {
      return false;
    }
  }
  return true;
}

var shallow = (function (objA, objB) {
  if (process.env.NODE_ENV !== 'production') {
    console.warn("[DEPRECATED] Default export is deprecated. Instead use `import { shallow } from 'zustand/shallow'`.");
  }
  return shallow$1(objA, objB);
});

exports.default = shallow;
exports.shallow = shallow$1;

module.exports = shallow;
module.exports.shallow = shallow$1;
exports.default = module.exports;