Upgrade to CRA 4 + TS 4

[abrkn]

Anyone made this work?

[abrkn]

Bump

[artdent]

You might have luck using Craco, which supports create-react-app 4.x and can work in a monorepo by applying basically the same webpack config patch as react-workspaces. https://javascript.plainenglish.io/react-monorepo-using-yarn-workspaces-only-no-lerna-766c7a395140 is a decent guide on the subject.