old_contents: // This script copies src/index.html into /dist/index.html
  // and adds TrackJS error tracking code for use in production
  // when useTrackJs is set to true below and a trackJsToken is provided.
  // This is a good example of using Node and cheerio to do a simple file transformation.
  // In this case, the transformation is useful since we only want to track errors in the built production code.
  
  // Allowing console calls below since this is a build file.
  /* eslint-disable no-console */
  
  import fs from 'fs';
  import {chalkSuccess, chalkError, chalkWarning} from './chalkConfig';
  import cheerio from 'cheerio';
  
  const useTrackJs = true; // If you choose not to use TrackJS, just set this to false and the build warning will go away.
  const trackJsToken = ''; // If you choose to use TrackJS, insert your unique token here. To get a token, go to https://trackjs.com
  
  fs.readFile('src/index.html', 'utf8', (readError, markup) => {
    if (readError) {
      return console.log(chalkError(readError));
    }
  
    const $ = cheerio.load(markup);
  
    // since a separate spreadsheet is only utilized for the production build, need to dynamically add this here.
    $('head').prepend('<link rel="stylesheet" href="/styles.css">');
  
    if (useTrackJs) {
      if (trackJsToken) {
        const trackJsCode = `<!-- BEGIN TRACKJS Note: This should be the first <script> on the page per https://my.trackjs.com/install --><script>window._trackJs = { token: '${trackJsToken}' };</script><script src=https://d2zah9y47r7bi2.cloudfront.net/releases/current/tracker.js></script><!-- END TRACKJS -->`;
  
        $('head').prepend(trackJsCode); // add TrackJS tracking code to the top of <head>
      } else {
        console.log(chalkWarning('To track JavaScript errors, sign up for a free trial at TrackJS.com and enter your token in /tools/build.html on line 10.'));
      }
    }
  
    fs.writeFile('dist/index.html', $.html(), 'utf8', (writeError) => {
      if (writeError) {
        return console.log(chalkError(writeError));
      }
      console.log(chalkSuccess('index.html written to /dist'));
  
      return writeError;
    });
  
    return readError;
  });
new_contents: // This script copies src/index.html into /dist/index.html
  // and adds TrackJS error tracking code for use in production
  // when useTrackJs is set to true below and a trackJsToken is provided.
  // This is a good example of using Node and cheerio to do a simple file transformation.
  // In this case, the transformation is useful since we only want to track errors in the built production code.
  
  // Allowing console calls below since this is a build file.
  /* eslint-disable no-console */
  
  import fs from 'fs';
  import {chalkSuccess, chalkError, chalkWarning} from './chalkConfig';
  import cheerio from 'cheerio';
  
  const useTrackJs = true; // If you choose not to use TrackJS, just set this to false and the build warning will go away.
  const trackJsToken = ''; // If you choose to use TrackJS, insert your unique token here. To get a token, go to https://trackjs.com
  
  fs.readFile('src/index.html', 'utf8', (readError, markup) => {
    if (readError) {
      return console.log(chalkError(readError));
    }
  
    const $ = cheerio.load(markup);
  
    // since a separate spreadsheet is only utilized for the production build, need to dynamically add this here.
    $('head').append('<link rel="stylesheet" href="/styles.css">');
  
    if (useTrackJs) {
      if (trackJsToken) {
        const trackJsCode = `<!-- BEGIN TRACKJS Note: This should be the first <script> on the page per https://my.trackjs.com/install --><script>window._trackJs = { token: '${trackJsToken}' };</script><script src=https://d2zah9y47r7bi2.cloudfront.net/releases/current/tracker.js></script><!-- END TRACKJS -->`;
  
        $('head').prepend(trackJsCode); // add TrackJS tracking code to the top of <head>
      } else {
        console.log(chalkWarning('To track JavaScript errors, sign up for a free trial at TrackJS.com and enter your token in /tools/build.html on line 10.'));
      }
    }
  
    fs.writeFile('dist/index.html', $.html(), 'utf8', (writeError) => {
      if (writeError) {
        return console.log(chalkError(writeError));
      }
      console.log(chalkSuccess('index.html written to /dist'));
  
      return writeError;
    });
  
    return readError;
  });
subject: Load styles last for same beahviour as in dev mode