freezeRecursive method #javascript #es6

freezeRecursive.js

/**
 * Freeze given value recursively if needed.
 * @param obj
 * @return {*}
 */
export default function freezeRecursive(obj) {
    Object.freeze(obj);

    if (obj === undefined) {
        return obj;
    }

    Object.getOwnPropertyNames(obj).forEach((prop) => {
        if (
            obj[prop] !== null
            && (typeof obj[prop] === 'object' || typeof obj[prop] === 'function')
            && !Object.isFrozen(obj[prop])
        ) {
            freezeRecursive(obj[prop]);
        }
    });

    return obj;
}