function shallowEqual(objA, objB, compare, compareContext) {
  var compareResult = compare ? compare.call(compareContext, objA, objB) : void 0;

  if (compareResult !== void 0) {
    return !!compareResult;
  }

  if (objA === objB) {
    return true;
  }

  if (typeof objA !== 'object' || !objA || typeof objB !== 'object' || !objB) {
    return false;
  }

  var keysA = Object.keys(objA);
  var keysB = Object.keys(objB);

  if (keysA.length !== keysB.length) {
    return false;
  }

  var bHasOwnProperty = Object.prototype.hasOwnProperty.bind(objB); // Test for A's keys different from B.

  for (var idx = 0; idx < keysA.length; idx++) {
    var key = keysA[idx];

    if (!bHasOwnProperty(key)) {
      return false;
    }

    var valueA = objA[key];
    var valueB = objB[key];
    compareResult = compare ? compare.call(compareContext, valueA, valueB, key) : void 0;

    if (compareResult === false || compareResult === void 0 && valueA !== valueB) {
      return false;
    }
  }

  return true;
}

export { shallowEqual };
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