find shortest path from one wiki page to the other

wikisearch.js

import axios from 'axios'

export async function findShortestPath(firstPage, secondPage, callback, parent) {
  if (state === undefined) {
    state = {}
    state.done = false;
    state.visited = {}
    
    state.visited[firstPage] = true;
  }

  if (state.done) return;

  console.log("Checking ${firstPage}")

  const page = {
    'page': firstPage,
    'parent': parent
  };

  if (firstPage === secondPage) {
    state.done = true;
    callback(page);
  }

  await axios.get('https://en.wikipedia.org/wiki/' + firstPage)
    .then(response => {
        let domParser = new DOMParser();
        let htmlDoc = domParser.parseFromString(response.data, 'text/html');

        let urls = htmlDoc.getElementById('bodyContent')
          .innerHTML
          .match(/\/wiki\/(?!(?:Talk|Wikipedia|User|Template|Template_talk|Category|Help|File|Special):)([^#"]+)/g);
        
        urls.forEach(url => {
          if (!state.visited[url]) {
            state.visited[url] = true;
            findShortestPath(url, secondPage, callback, page);
          }
        })
      })
    .catch(() => that.message = "An error has occurred.")
}

function printAll(page) {
  return page.parent ? printAll(page.parent) + " --> " + page.page : page.page;
}

findShortestPath("Lebanon", "Panda", printAll);