Lambda@Edge to redirect to default HTML page

DefaultIndexHTML.js

'use strict';

const path = require('path');

/**
 * Redirects URI to default document.
 * Any URI without an extension is assumed to be 
 * a directory reference and will have '/index.html'
 * appended to the URI.
 * Useful as Lambda@Edge on CloudFront Origin Request event
 */
exports.handler = (event, context, callback) => {
  const request = event.Records[0].cf.request;
  const uri = request.uri;  
  const parsedPath = path.parse(uri);

  if (parsedPath.ext === '') {
    let newUri = path.join(parsedPath.dir, parsedPath.base, 'index.html');
    // Update to the URI that includes the index page
    request.uri = newUri;  
  }

  callback(null, request);
};