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glacier

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// repository documentation

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```bash
npm i @hazae41/glacier
```

[**Node Package 📦**](https://www.npmjs.com/package/@hazae41/glacier) • [**Read the docs 📚**](https://github.com/hazae41/glacier/blob/master/docs) • [**Next.js Example 🪣**](https://codesandbox.io/p/github/hazae41/glacier-example-next) • [**Expo Example 🪣**](https://snack.expo.dev/@git/github.com/hazae41/xswr-example-expo) • [**Comparison with other libs 🌐**](https://github.com/hazae41/glacier/blob/master/docs/comparison.md)

## Philosophy 🧠

Glacier uses two new approaches compared to other data fetching libraries like swr or react-query:
1) Encapsulating key+fetcher+params in a single abstraction called schema.
2) Composing features with very simple hooks instead of having bloated configuration and unexpected behaviors.

```tsx
function useAutoFetchMixture(query: Query) {
  useFetch(query) // Fetch on mount and url change
  useVisible(query) // Fetch when the page is focused
  useOnline(query) // Fetch when the browser is online
}

function useHelloWithAutoFetch() {
  const query = useQuery(createHelloQuery, [])
  useAutoFetchMixture(query)
  return query
}

function MyApp() {
  const { data, error } = useHelloWithAutoFetch()

if (error != null)
    return <MyError error={error} />
  if (data == null)
    return <MyLoading />
  return <MyPage data={data} />
}
```

## Features 🔥

- 100% TypeScript and ESM
- No external dependency
- Composition-based hooks
- Rust-like patterns
- Transport agnostic (REST, GraphQL, WebSocket)
- Storage agnostic (IndexedDB, localStorage)
- Works in a Service Worker or in a serverless function
- Per-query, encrypted, garbage-collected, persistent storage
- Store normalization and indexes
- Concurrent and multi-step optimistic states
- Request deduplication, cooldown, timeout, cancellation, expiration, and retrying
- Automatic refetching based on various signals
- Page-based and cursor-based pagination
- SSR & ISR support
- React Suspense support
- React Native support

glacier

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