class InternalOptions { constructor() { this.skipUndefined = false; this.keepImplicitJoinProps = false; this.debug = false; } clone() { const copy = new this.constructor(); copy.skipUndefined = this.skipUndefined; copy.keepImplicitJoinProps = this.keepImplicitJoinProps; copy.debug = this.debug; return copy; } } module.exports = InternalOptions;