React Query v3 (Legacy)

react-query is a robust and widely adopted library for managing, caching, and synchronizing asynchronous data within React applications. This registry entry refers to version 3.x.x of the `react-query` package, with 3.39.3 being the latest patch provided. Since late 2021, active development and new major versions (v4, v5) have transitioned to the `@tanstack/react-query` package as part of a broader monorepo rebrand. Consequently, the `react-query` package (v3) is now in a maintenance-only phase, receiving critical bug fixes but no new features. Its key differentiators include declarative data fetching via hooks (`useQuery`, `useMutation`), automatic background refetching, efficient data caching with configurable stale-time and cache-time, optimistic updates, and a powerful devtools extension. It significantly reduces boilerplate for data management compared to traditional state management solutions for remote data.