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function is(x: unknown, y: unknown) {↩
if (x === y) {↩
return x !== 0 || y !== 0 || 1 / x === 1 / y↩
} else {↩
return x !== x && y !== y↩
}↩
}↩
↩
export default function shallowEqual(objA: any, objB: any) {↩
if (is(objA, objB)) return true↩
↩
if (↩
typeof objA !== 'object' ||↩
objA === null ||↩
typeof objB !== 'object' ||↩
objB === null↩
) {↩
return false↩
}↩
↩
const keysA = Object.keys(objA)↩
const keysB = Object.keys(objB)↩
↩
if (keysA.length !== keysB.length) return false↩
↩
for (let i = 0; i < keysA.length; i++) {↩
if (↩
!Object.prototype.hasOwnProperty.call(objB, keysA[i]) ||↩
!is(objA[keysA[i]], objB[keysA[i]])↩
) {↩
return false↩
}↩
}↩
↩
return true↩
}↩