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// @flow
module.exports = function shallowEqual<T, U>(
objA?: ?T,
objB?: ?U,
compare?: ?(objValue: any, otherValue: any, key?: string) => boolean | void,
compareContext?: ?any
): boolean {
var ret = compare ? compare.call(compareContext, objA, objB) : void 0;
if (ret !== void 0) {
return !!ret;
}
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];
ret = compare ? compare.call(compareContext, valueA, valueB, key) : void 0;
if (ret === false || (ret === void 0 && valueA !== valueB)) {
return false;
}
}
return true;
};
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