Pin typescript to 2.3.x unitl ready for 2.4.x
Pin typescript to 2.3.x unitl ready for 2.4.x

devex-web-frontend/create-react-app-dx,devex-web-frontend/create-react-app-dx,devex-web-frontend/create-react-app-dx,devex-web-frontend/create-react-app-dx