I\'m getting this error on my index.tsx.
Property \'REDUX_DEVTOOLS_EXTENSION_COMPOSE\' does not exist on type \'Window\'.
Here is my index.tsx
For anyone struggling with getting concurrently to work, the general advice I found is to replace your "client" script in package.json with: "client": "cd client && npm start",
I tried this and I still got an error, so then I tried: "client": "cd client && cd my-app && npm start",
This worked for me! The problem is that when you use create-react-app inside the "client" folder, there is an added level in between the client folder and your public and src folders which is called "my-app" by default. Using Brad's code, npm misses this folder so can't find the react files it needs to start your app.