For DefinitelyTyped's @types/next-redux-wrapper, issue
#24293
Either open /test/pages/index.spec.tsx in Visual Studio Code (with
TypeScript support installed) or run npm run lint, which applies
type checking and should show the same error:
Error at test/pages/index.spec.tsx:9:30: JSX element type 'Index' does not have any construct or call signatures.