@microsoft/sp-webpart-base/lib/utils/Object.js

SharePoint Framework support for building web parts

/**
 * Utility code to help manipulate objects.
 */
import * as lodash from '@microsoft/sp-lodash-subset';
/**
 * To make obj fully immutable, freeze each object in obj.
 * @remarks
 * this works only on pure JSON objects by design.
 *
 * @param obj - object to freeze
 */
export function deepFreeze(obj) {
    if (!obj) {
        return undefined;
    }
    if (!Object.isFrozen(obj)) {
        Object.freeze(obj);
    }
    var depth = 0;
    var func = function (o) {
        // Do not go more than 5 level deep
        if (++depth > 5) {
            return;
        }
        var propNames = Object.getOwnPropertyNames(o);
        propNames.forEach(function (name) {
            var prop = o[name];
            if (typeof prop === 'object' && !!prop && !lodash.isElement(prop) && !Object.isFrozen(prop)) {
                func(prop);
            }
        });
    };
    func(obj);
    return obj;
}
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