This SPFx web part demonstrates how to use the React useReducer hook with the PnPjs library to fetch items from a SharePoint list. By using useReducer, developers can better manage complex state within their React components, making it easier to handle asynchronous data fetching, loading states, and error handling.
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Source: https://github.com/pnp/sp-dev-fx-webparts/tree/main/samples/react-use-reducer-hook