alm/src/common/pure.js

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"use strict";
/**
 * Mutablity helpers
 */
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Shallow Equal and Shallow Compare from
 * https://github.com/gaearon/react-pure-render/blob/master/src/shallowEqual.js
 *
 */
function shouldComponentUpdate(nextProps, nextState) {
    return !shallowEqual(this.props, nextProps) ||
        !shallowEqual(this.state, nextState);
}
exports.shouldComponentUpdate = shouldComponentUpdate;
/**
 * Performs equality by iterating through keys on an object and returning
 * false when any key has values which are not strictly equal between
 * objA and objB. Returns true when the values of all keys are strictly equal.
 *
 * @return {boolean}
 */
function shallowEqual(objA, objB) {
    if (objA === objB) {
        return true;
    }
    if (typeof objA !== 'object' || objA === null ||
        typeof objB !== 'object' || objB === null) {
        return false;
    }
    var keysA = Object.keys(objA);
    var keysB = Object.keys(objB);
    if (keysA.length !== keysB.length) {
        return false;
    }
    // Test for A's keys different from B.
    var bHasOwnProperty = Object.prototype.hasOwnProperty.bind(objB);
    for (var i = 0; i < keysA.length; i++) {
        if (!bHasOwnProperty(keysA[i]) || objA[keysA[i]] !== objB[keysA[i]]) {
            return false;
        }
    }
    return true;
}
exports.shallowEqual = shallowEqual;