Accepted answer

The first issue has to do with "jsx" config as mentioned by Martin. Set "jsx" to "react".

The second issue has to do with your code. Change it like this:

class DiviAppBar extends React.Component<Props, State> ...

Create an interface for your props and another one for your state. If you don't have any use empty objects.

class DiviAppBar extends React.Component<{}, {}> ...

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