code: function getUpdatedEmittedFiles(emittedFiles, webpackRuntimeFiles) {
      let fallbackFiles = [];
      let hotHash;
      if (emittedFiles.some(x => x.endsWith('.hot-update.json'))) {
          let result = emittedFiles.slice();
          const hotUpdateScripts = emittedFiles.filter(x => x.endsWith('.hot-update.js'));
          hotUpdateScripts.forEach(hotUpdateScript => {
              const { name, hash } = parseHotUpdateChunkName(hotUpdateScript);
              hotHash = hash;
              // remove bundle/vendor.js files if there's a bundle.XXX.hot-update.js or vendor.XXX.hot-update.js
              result = result.filter(file => file !== `${name}.js`);
              if (webpackRuntimeFiles && webpackRuntimeFiles.length) {
                  // remove files containing only the Webpack runtime (e.g. runtime.js)
                  result = result.filter(file => webpackRuntimeFiles.indexOf(file) === -1);
              }
          });
          //if applying of hot update fails, we must fallback to the full files
          fallbackFiles = emittedFiles.filter(file => result.indexOf(file) === -1);
          return { emittedFiles: result, fallbackFiles, hash: hotHash };
      }
      else {
          return { emittedFiles, fallbackFiles };
      }
  }
docs: Checks if there's a file in the following pattern 5e0326f3bb50f9f26cf0.hot-update.json
  if yes this is a HMR update and remove all bundle files as we don't need them to be synced,
  but only the update chunks