Function shallowEqual

packages/mobx-react/src/utils/utils.ts:1–20

(objA: any, objB: any)

export function shallowEqual(objA: any, objB: any): boolean {
    //From: https://github.com/facebook/fbjs/blob/c69904a511b900266935168223063dd8772dfc40/packages/fbjs/src/core/shallowEqual.js
    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.hasOwnProperty.call(objB, keysA[i]) || !is(objA[keysA[i]], objB[keysA[i]])) {
            return false
        }
    }
    return true
}

function is(x: any, y: any): boolean {
    // From: https://github.com/facebook/fbjs/blob/c69904a511b900266935168223063dd8772dfc40/packages/fbjs/src/core/shallowEqual.js