XML Builder was the part of fast-xml-parser for years. But considering that any bug in builder may false-alarm the users who are only using parser and vice-versa, we have decided to split it into a separate package.
Migration
To migrate to fast-xml-builder;
From
import { XMLBuilder } from "fast-xml-parser";
To
import XMLBuilder from "fast-xml-builder";
XMLBuilder will be removed from current package in any next major version of this library. So better to migrate.