npx create-react-app my-app --template typescript
cd my-app
yarn add conan-js-core
cd src
rm App.tsx App.test.tsx App.css
curl -o app.tsx https://raw.githubusercontent.com/conan-js/conan-js-examples/master/helloWow/src/app.tsx
curl -o index.tsx https://raw.githubusercontent.com/conan-js/conan-js-examples/master/helloWow/src/index.tsx
cd ..
yarn start
If you want to start from scratch with create-react-app, this will get you the files from the demo into a new create-react-app application with typescript.