(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
  typeof define === 'function' && define.amd ? define(['exports'], factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.zustandVanillaShallow = {}));
})(this, (function (exports) { '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(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;
  }

  exports.shallow = shallow;

}));