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Filename : shallow.js
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'use strict';

var ReactExports = require('react');

function _arrayLikeToArray(r, a) {
  (null == a || a > r.length) && (a = r.length);
  for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e];
  return n;
}
function _createForOfIteratorHelperLoose(r, e) {
  var t = "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"];
  if (t) return (t = t.call(r)).next.bind(t);
  if (Array.isArray(r) || (t = _unsupportedIterableToArray(r)) || e) {
    t && (r = t);
    var o = 0;
    return function () {
      return o >= r.length ? {
        done: !0
      } : {
        done: !1,
        value: r[o++]
      };
    };
  }
  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 _unsupportedIterableToArray(r, a) {
  if (r) {
    if ("string" == typeof r) return _arrayLikeToArray(r, a);
    var t = {}.toString.call(r).slice(8, -1);
    return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0;
  }
}

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;
}

var useRef = ReactExports.useRef;
function useShallow(selector) {
  var prev = useRef();
  return function (state) {
    var next = selector(state);
    return shallow(prev.current, next) ? prev.current : prev.current = next;
  };
}

exports.useShallow = useShallow;