React Functional Component web part with data fetch

This web part demonstrates building a React functional component that uses data from a remote service, in this case the Microsoft Graph, using the recently introduced React Hooks feature. The example web part renders a list of the user’s Teams and, optionally, the channels in each Team.

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Source: https://github.com/pnp/sp-dev-fx-webparts/tree/main/samples/react-functional-component-with-data-fetch