Replace ECMA Sets with DocumentClient Sets

ddb.replace-sets.ts

import { DocumentClient } from 'aws-sdk/clients/dynamodb';

function ReplaceSets(item: any) {
    const keys = Object.keys(item);
    for (let index = 0; index < keys.length; index++) {
        const element = item[keys[index]];
        if (typeof element === 'object' && element instanceof Set) {
            if (element.size === 0){
                item[keys[index]] = null;
            } else {
                item[keys[index]] = DocumentClient.prototype.createSet([...element]);
            }
            continue;
        }
        if (element.constructor == Object || Array.isArray(element)) {
            item[keys[index]] = ReplaceSets(element);
            continue;
        }
    }
    return item;
}