Promise resolves after all the fetching is done

promiseAll.js

const fetchAllTheRepos = (userName, repoCount) => {
  const MAX_PER_PAGE = 100;
  const baseUrl = 'https://api.github.com/users/' + userName +
    '/repos?per_page=' + MAX_PER_PAGE;

  //Start fetching every page of repos.
  const fetchPromises = [], pageCount = Math.ceil(repoCount / 
    MAX_PER_PAGE);
  for (let pageI = 1; pageI <= pageCount; ++pageI) {
    const fetchPagePromise = fetch(baseUrl + '&page=' + pageI);
    fetchPromises.push(fetchPagePromise);
  }

  //This promise resolves after all the fetching is done.
  return Promise.all(fetchPromises)
  .then((responses) => {
     //Parse all the responses to JSON.
     return Promise.all( responses.map((response) => response.json()) );
  }).then((results) => {
    //Copy the results into one big array that has all the friggin repos.
    let repos = [];
    results.forEach((result) => {
      repos = repos.concat(result);
    });
    return repos;
  });
};

//I left out the code to get the repo count, but that's pretty easy.
fetchAllTheRepos('erikh2000', 7).then((repos) => {
    console.log(repos.length);
});