message: Remove the React service worker.
  While a PWA sounds like a nice idea, imsejs is not web app (yet).
  If we do go that route, we can always re-add this later, but for
  now it's really just dead code.
diff: 'use strict';
  const errorOverlayMiddleware = require('react-error-overlay/middleware');
  -const noopServiceWorkerMiddleware = require('react-dev-utils/noopServiceWorkerMiddleware');
  const config = require('./webpack.config.dev');
  const paths = require('./paths');
  @@ -84,12 +83,6 @@ module.exports = function(proxy, allowedHost) {
  setup(app) {
  // This lets us open files from the runtime error overlay.
  app.use(errorOverlayMiddleware());
  - // This service worker file is effectively a 'no-op' that will reset any
  - // previous service worker registered for the same host:port combination.
  - // We do this in development to avoid hitting the production cache if
  - // it used the same host and port.
  - // https://github.com/facebookincubator/create-react-app/issues/2272#issuecomment-302832432
  - app.use(noopServiceWorkerMiddleware());
  require(paths.appBuiltMainJs);
  },
  