xml-xpath.ts

import * as xpath from 'xpath';
import * as xmldom from '@xmldom/xmldom';

const xml = `<book><title foo="bar">Harry Potter</title></book>`;
const doc = new xmldom.DOMParser().parseFromString(xml, 'text/xml') as any as Node;

const [ firstTitleText ] = xpath.select("//title/text()", doc);
console.assert(firstTitleText.nodeValue === "Harry Potter");

const result: xpath.SelectSingleReturnType = xpath.select1("//title/text()", doc);
console.assert(result.nodeValue === "Harry Potter");

const title = xpath.select1("//title/@foo", doc) as Element;
console.assert(title.nodeValue === "bar");