### Install Dependencies

Source: https://eden-query.xkel.me/docs

Install the required packages for Eden TanStack Query and its peer dependencies.

```bash
npm i eden-tanstack-react-query @tanstack/react-query @elysiajs/eden elysia
```

--------------------------------

### Install Eden TanStack Query (yarn)

Source: https://eden-query.xkel.me/docs/getting-started

Install the package and its peer dependencies using yarn.

```bash
yarn add eden-tanstack-react-query @tanstack/react-query @elysiajs/eden elysia
```

--------------------------------

### Setup Provider

Source: https://eden-query.xkel.me/docs/comparisons

Configure the EdenProvider and QueryClientProvider for the application.

```typescript
const { EdenProvider, useEden } = createEdenTanStackQuery<App>()
const edenClient = treaty<App>('http://localhost:3000')

<QueryClientProvider client={queryClient}>
  <EdenProvider client={edenClient} queryClient={queryClient}>
    <App />
  </EdenProvider>
</QueryClientProvider>
```

--------------------------------

### Install Testing Dependencies

Source: https://eden-query.xkel.me/docs/guides/testing

Install necessary testing libraries including Vitest, Testing Library, and jsdom.

```bash
bun add -D vitest @testing-library/react @testing-library/jest-dom @testing-library/user-event jsdom @vitejs/plugin-react
```

--------------------------------

### Setup Test Environment

Source: https://eden-query.xkel.me/docs/guides/testing

Set up the testing environment by importing necessary libraries and cleaning up mocks after each test.

```typescript
import '@testing-library/jest-dom/vitest'
import { afterEach, vi } from 'vitest'
import { cleanup } from '@testing-library/react'

afterEach(() => {
  cleanup()
  vi.restoreAllMocks()
})
```

--------------------------------

### Install Eden TanStack Query (npm)

Source: https://eden-query.xkel.me/docs/getting-started

Install the package and its peer dependencies using npm.

```bash
npm install eden-tanstack-react-query @tanstack/react-query @elysiajs/eden elysia
```

--------------------------------

### Install Eden TanStack Query (pnpm)

Source: https://eden-query.xkel.me/docs/getting-started

Install the package and its peer dependencies using pnpm.

```bash
pnpm add eden-tanstack-react-query @tanstack/react-query @elysiajs/eden elysia
```

--------------------------------

### Mutation Key Example

Source: https://eden-query.xkel.me/docs/guides/query-keys

Shows how to generate a mutation key for a mutation route using `mutationKey()`.

```javascript
eden.users.post.mutationKey()
// => [['users', 'post']]

```

--------------------------------

### Infinite Query Key Example

Source: https://eden-query.xkel.me/docs/guides/query-keys

Shows how to generate a query key specifically for infinite queries using `infiniteQueryKey()`.

```javascript
eden.posts.get.infiniteQueryKey({ limit: 10 })
// => [['posts', 'get'], { input: { limit: 10 }, type: 'infinite' }]

```

--------------------------------

### Query Key Structure and Examples

Source: https://eden-query.xkel.me/docs/guides/query-keys

Demonstrates the structure of query keys generated by Eden TanStack Query and provides examples for different scenarios, including regular queries and infinite queries.

```APIDOC
## Query Key Structure

Query keys follow this structure:
```
// queryKey() returns:
[['path', 'segments', 'method'], { input: { ... }, type: 'query' }]

// Examples:
eden.users.get.queryKey()
// => [['users', 'get'], { type: 'query' }]

eden.users.get.queryKey({ role: 'admin' })
// => [['users', 'get'], { input: { role: 'admin' }, type: 'query' }]

eden.users({ id: '1' }).get.queryKey()
// => [['users', 'get'], { input: { id: '1' }, type: 'query' }]
```

The `type` field differentiates regular queries from infinite queries:
```
eden.posts.get.infiniteQueryKey({ limit: 10 })
// => [['posts', 'get'], { input: { limit: 10 }, type: 'infinite' }]
```
```

--------------------------------

### Install Peer Dependencies

Source: https://eden-query.xkel.me/docs/troubleshooting

Required packages for Eden TanStack Query integration.

```bash
bun add eden-tanstack-react-query @tanstack/react-query @elysiajs/eden elysia
```

--------------------------------

### Monorepo Setup: Import App Type

Source: https://eden-query.xkel.me/docs/getting-started

Import the exported `App` type from the server package into your client package to enable type-safe Eden client setup.

```typescript
import type { App } from '@myorg/server'

```

--------------------------------

### Configure Basic Eden TanStack Setup

Source: https://eden-query.xkel.me/docs/api-reference/create-eden-tanstack-query

Initialize the typed hooks and the Eden Treaty client for use in the application.

```typescript
import { createEdenTanStackQuery } from 'eden-tanstack-react-query'
import { treaty } from '@elysiajs/eden'
import type { App } from './server'

// Create typed hooks and provider
export const { EdenProvider, useEden, useEdenClient } = createEdenTanStackQuery<App>()

// Create the Eden client
export const edenClient = treaty<App>('http://localhost:3000')
```

--------------------------------

### Use EdenOptionsProxy

Source: https://eden-query.xkel.me/docs/api-reference/types

Example usage of the decorated options proxy for an Elysia app.

```typescript
// Usage
type Proxy = EdenOptionsProxy<typeof app>
// Proxy.users.get.queryOptions(...)
// Proxy.users({ id: '1' }).get.queryOptions(...)
// Proxy.users.post.mutationOptions(...)
```

--------------------------------

### Query Key Structure Examples

Source: https://eden-query.xkel.me/docs/guides/query-keys

Demonstrates the structure of query keys generated by Eden TanStack Query, including variations with and without input parameters.

```javascript
eden.users.get.queryKey()
// => [['users', 'get'], { type: 'query' }]


```

```javascript
eden.users.get.queryKey({ role: 'admin' })
// => [['users', 'get'], { input: { role: 'admin' }, type: 'query' }]


```

```javascript
eden.users({ id: '1' }).get.queryKey()
// => [['users', 'get'], { input: { id: '1' }, type: 'query' }]

```

--------------------------------

### Combining Path Parameters with Infinite Queries

Source: https://eden-query.xkel.me/docs/guides/infinite-queries

Example of using `useInfiniteQuery` with dynamic route parameters, such as fetching posts for a specific user ID.

```javascript
// GET /users/:id/posts
function UserPosts({ userId }: { userId: string }) {
  const eden = useEden()

  const { data } = useInfiniteQuery(
    eden.users({ id: userId }).posts.get.infiniteQueryOptions(
      { limit: 10 },
      {
        getNextPageParam: (page) => page.nextCursor ?? undefined,
        initialCursor: null,
      }
    )
  )
}
```

--------------------------------

### Configure Vitest

Source: https://eden-query.xkel.me/docs/guides/testing

Configure Vitest for a React project using jsdom environment and specify setup files.

```typescript
import { defineConfig } from 'vitest/config'
import react from '@vitejs/plugin-react'

export default defineConfig({
  plugins: [react()],
  test: {
    environment: 'jsdom',
    setupFiles: ['./test/setup.ts'],
    globals: true
  }
})
```

--------------------------------

### Server Route for Cursor-Based Pagination

Source: https://eden-query.xkel.me/docs/guides/infinite-queries

A typical server route setup for handling cursor-based pagination requests, expecting 'limit' and 'cursor' query parameters.

```javascript
app.get('/posts', ({ query }) => {
  const { limit, cursor } = query
  const posts = getPosts({ limit, after: cursor })

  return {
    items: posts,
    nextCursor: posts.length === limit ? posts[posts.length - 1].id : null,
  }
}, {
  query: t.Object({
    limit: t.Number({ default: 10 }),
    cursor: t.Optional(t.String()),
  })
})
```

--------------------------------

### Monorepo Setup: Export App Type

Source: https://eden-query.xkel.me/docs/getting-started

In a monorepo, export the `App` type from your server package to make it available for client-side type inference.

```typescript
export type App = typeof app

```

--------------------------------

### Set Up QueryClientProvider and EdenProvider

Source: https://eden-query.xkel.me/docs/getting-started

Wrap your application with `QueryClientProvider` and `EdenProvider` to make the clients available throughout your app.

```typescript
import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
import { EdenProvider, edenClient } from './lib/eden'

const queryClient = new QueryClient()

export default function App() {
  return (
    <QueryClientProvider client={queryClient}>
      <EdenProvider client={edenClient} queryClient={queryClient}>
        <YourApp />
      </EdenProvider>
    </QueryClientProvider>
  )
}

```

--------------------------------

### Basic Infinite Query Usage with useInfiniteQuery

Source: https://eden-query.xkel.me/docs/guides/infinite-queries

Demonstrates the basic implementation of `useInfiniteQuery` for fetching paginated data, including loading states and a 'Load More' button.

```javascript
import { useInfiniteQuery } from '@tanstack/react-query'
import { useEden } from './lib/eden'

function PostList() {
  const eden = useEden()

  const {
    data,
    fetchNextPage,
    hasNextPage,
    isFetchingNextPage,
    isLoading,
  } = useInfiniteQuery(
    eden.posts.get.infiniteQueryOptions(
      { limit: 10 },
      {
        getNextPageParam: (lastPage) => lastPage.nextCursor ?? undefined,
        initialCursor: null,
      }
    )
  )

  if (isLoading) return <div>Loading...</div>

  return (
    <div>
      {data?.pages.map((page) =>
        page.items.map((post) => (
          <article key={post.id}>
            <h2>{post.title}</h2>
          </article>
        ))
      )}

      <button
        onClick={() => fetchNextPage()}
        disabled={!hasNextPage || isFetchingNextPage}
      >
        {isFetchingNextPage ? 'Loading more...' : hasNextPage ? 'Load More' : 'No more posts'}
      </button>
    </div>
  )
}
```

--------------------------------

### Basic Query with useQuery

Source: https://eden-query.xkel.me/docs/guides/queries

Use `useQuery` with `queryOptions()` to fetch data. Handles loading and error states.

```javascript
import { useQuery } from '@tanstack/react-query'
import { useEden } from './lib/eden'

function UserList() {
  const eden = useEden()

  const { data, isLoading, error } = useQuery(
    eden.users.get.queryOptions()
  )

  if (isLoading) return <div>Loading...</div>
  if (error) return <div>Error: {error.message}</div>

  return (
    <ul>
      {data?.map(user => (
        <li key={user.id}>{user.name}</li>
      ))}
    </ul>
  )
}
```

--------------------------------

### Create Eden TanStack Query Instance

Source: https://eden-query.xkel.me/docs/getting-started

Set up the Eden TanStack Query instance and treaty client. Ensure the `App` type is imported from your server.

```typescript
import { createEdenTanStackQuery } from 'eden-tanstack-react-query'
import { treaty } from '@elysiajs/eden'
import type { App } from '../../server'

export const { EdenProvider, useEden } = createEdenTanStackQuery<App>()
export const edenClient = treaty<App>('http://localhost:3000')

```

--------------------------------

### Query Routes API

Source: https://eden-query.xkel.me/docs/api-reference

Methods available on query routes (GET, HEAD, OPTIONS) for managing data fetching, cache operations, and invalidation.

```APIDOC
## Query Routes (GET, HEAD, OPTIONS)

### Description
Provides methods to generate query options, keys, and filters for TanStack Query hooks.

### Methods
- **queryOptions(input?, opts?)**: Generates options for `useQuery`.
- **queryKey(input?)**: Generates a query key for cache operations.
- **queryFilter(input?, filters?)**: Generates filters for cache invalidation.
- **infiniteQueryOptions(input, opts)**: Generates options for `useInfiniteQuery` (for paginated data).
- **infiniteQueryKey(input?)**: Generates a query key for infinite query cache operations.

### Usage Example
```typescript
const eden = useEden();

// Standard query
eden.users.get.queryOptions(input, opts);

// Infinite query
eden.posts.get.infiniteQueryOptions(input, opts);
```
```

--------------------------------

### Using infiniteQueryKey and infiniteQueryFilter for Cache Operations

Source: https://eden-query.xkel.me/docs/guides/infinite-queries

Demonstrates how to obtain the infinite query key and invalidate queries using `infiniteQueryKey` and `infiniteQueryFilter` with `useQueryClient`.

```javascript
const queryClient = useQueryClient()
const eden = useEden()

// Get the infinite query key
const key = eden.posts.get.infiniteQueryKey({ limit: 10 })

// Invalidate infinite query
queryClient.invalidateQueries({
  queryKey: eden.posts.get.infiniteQueryKey()
})

// Using infiniteQueryFilter
queryClient.invalidateQueries(
  eden.posts.get.infiniteQueryFilter({ category: 'tech' })
)
```

--------------------------------

### Prefetch Multiple Queries

Source: https://eden-query.xkel.me/docs/guides/ssr

Demonstrates how to prefetch multiple queries concurrently on the server.

```typescript
export default async function DashboardPage() {
  const queryClient = getQueryClient()
  const eden = createEdenOptionsProxy<App>({ client: getServerEdenClient(), queryClient })

  await Promise.all([
    queryClient.prefetchQuery(eden.users.get.queryOptions()),
    queryClient.prefetchQuery(eden.stats.get.queryOptions()),
  ])

  return (
    <HydrationBoundary state={dehydrate(queryClient)}>
      <Dashboard />
    </HydrationBoundary>
  )
}
```

--------------------------------

### Invalidate All Users Queries After Mutation

Source: https://eden-query.xkel.me/docs/guides/query-keys

This example shows how to invalidate all user-related queries after a successful user creation mutation, ensuring the UI reflects the latest data.

```javascript
const createUser = useMutation({
  ...eden.users.post.mutationOptions(),
  onSuccess: () => {
    // Invalidates all users queries (list, filtered, by id, etc.)
    queryClient.invalidateQueries({
      queryKey: eden.users.get.queryKey()
    })
  },
})

```

--------------------------------

### Compare Basic Query Implementation

Source: https://eden-query.xkel.me/docs/comparisons

Shows the difference in syntax for fetching data between eden-tanstack-query and @elysiajs/eden-query.

```typescript
const eden = useEden()
const { data } = useQuery(eden.users.get.queryOptions())
```

```typescript
const { data } = eden.users.get.useQuery()
```

--------------------------------

### Multiple API Instances

Source: https://eden-query.xkel.me/docs/api-reference/create-eden-tanstack-query

Demonstrates how to create and use multiple independent instances of Eden TanStack Query for different backends.

```APIDOC
## Multiple API Instances

You can create multiple instances for different backends:
```typescript
// Internal API
const internalApi = createEdenTanStackQuery<InternalApp>()

// External API
const externalApi = createEdenTanStackQuery<ExternalApp>()
```

Then use separate providers (or nest them):
```typescript
<internalApi.EdenProvider client={internalClient} queryClient={queryClient}>
  <externalApi.EdenProvider client={externalClient} queryClient={queryClient}>
    <App />
  </externalApi.EdenProvider>
</internalApi.EdenProvider>
```
```

--------------------------------

### Configure Next.js App Router Layout

Source: https://eden-query.xkel.me/docs/guides/ssr

Sets up the root layout to wrap the application with necessary providers.

```typescript
import { Providers } from './providers'

export default function RootLayout({ children }: { children: React.ReactNode }) {
  return (
    <html lang="en">
      <body>
        <Providers>{children}</Providers>
      </body>
    </html>
  )
}
```

--------------------------------

### Create Eden TanStack Query Instance

Source: https://eden-query.xkel.me/docs

Initialize the typed providers and hooks for the application.

```typescript
const { EdenProvider, useEden, useEdenClient } = createEdenTanStackQuery<App>()
```

--------------------------------

### Configure QueryClientProvider

Source: https://eden-query.xkel.me/docs/troubleshooting

Wraps the application with QueryClientProvider to ensure proper state management.

```tsx
function App() {
  return (
    <QueryClientProvider client={queryClient}>
      <EdenProvider client={edenClient} queryClient={queryClient}>
        <YourApp />
      </EdenProvider>
    </QueryClientProvider>
  )
}
```

--------------------------------

### queryOptions

Source: https://eden-query.xkel.me/docs/api-reference/use-eden

Creates type-safe options for useQuery, useSuspenseQuery, and prefetchQuery.

```APIDOC
## GET queryOptions

### Description
Creates type-safe options for useQuery, useSuspenseQuery, prefetchQuery, and other TanStack Query functions.

### Parameters
#### Request Body
- **input** (TInput | SkipToken) - Optional - Query parameters or skipToken to disable.
- **opts** (EdenQueryOptionsIn) - Optional - TanStack Query options (excluding reserved).

### Returns
- **queryKey** (DataTag<EdenQueryKey>) - Unique key based on path and input.
- **queryFn** (QueryFunction) - Fetch function via Eden client.
- **eden** (Object) - Route metadata.

### Request Example
{
  "input": { "role": "admin" },
  "opts": { "staleTime": 300000 }
}
```

--------------------------------

### Create a Basic Mutation

Source: https://eden-query.xkel.me/docs/guides/mutations

Use mutationOptions() to integrate Eden procedures with TanStack Query's useMutation hook.

```typescript
import { useMutation } from '@tanstack/react-query'
import { useEden } from './lib/eden'

function CreateUserForm() {
  const eden = useEden()

  const createUser = useMutation(
    eden.users.post.mutationOptions()
  )

  const handleSubmit = (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault()
    const formData = new FormData(e.currentTarget)
    createUser.mutate({
      name: formData.get('name') as string,
      email: formData.get('email') as string,
    })
  }

  return (
    <form onSubmit={handleSubmit}>
      <input name="name" placeholder="Name" required />
      <input name="email" type="email" placeholder="Email" required />
      <button type="submit" disabled={createUser.isPending}>
        {createUser.isPending ? 'Creating...' : 'Create User'}
      </button>
    </form>
  )
}
```

--------------------------------

### Create Eden Options Proxy

Source: https://eden-query.xkel.me/docs/guides/ssr

Initializes a server-side proxy to generate query options compatible with the client-side useEden hook.

```typescript
import { createEdenOptionsProxy } from 'eden-tanstack-react-query'

const eden = createEdenOptionsProxy<App>({
  client: serverClient,
  queryClient
})

// Use the same API as useEden()
await queryClient.prefetchQuery(eden.users.get.queryOptions())
```

--------------------------------

### infiniteQueryOptions

Source: https://eden-query.xkel.me/docs/api-reference/use-eden

Creates type-safe options for useInfiniteQuery with cursor-based pagination.

```APIDOC
## GET infiniteQueryOptions

### Description
Creates type-safe options for useInfiniteQuery with cursor-based pagination.

### Parameters
#### Request Body
- **input** (TInput | SkipToken) - Required - Query params (excluding cursor) or skipToken.
- **opts.getNextPageParam** (Function) - Required - Returns next page cursor.
- **opts.initialCursor** (TCursor) - Optional - Initial cursor value.
- **opts.getPreviousPageParam** (Function) - Optional - For bi-directional pagination.
- **opts.maxPages** (number) - Optional - Max pages to keep in memory.
```

--------------------------------

### Handle Multiple API Instances

Source: https://eden-query.xkel.me/docs/api-reference/create-eden-tanstack-query

Create and provide multiple API instances to support different backends within the same application.

```typescript
// Internal API
const internalApi = createEdenTanStackQuery<InternalApp>()

// External API
const externalApi = createEdenTanStackQuery<ExternalApp>()
```

```tsx
<internalApi.EdenProvider client={internalClient} queryClient={queryClient}>
  <externalApi.EdenProvider client={externalClient} queryClient={queryClient}>
    <App />
  </externalApi.EdenProvider>
</internalApi.EdenProvider>
```

--------------------------------

### Query with Input Parameters

Source: https://eden-query.xkel.me/docs/guides/queries

Pass query parameters to `queryOptions()` to filter results. Additional TanStack Query options can be passed as the second argument.

```javascript
// GET /users?role=admin&status=active
const { data } = useQuery(
  eden.users.get.queryOptions({ role: 'admin', status: 'active' })
)
```

```javascript
const { data } = useQuery(
  eden.users.get.queryOptions(
    { role: 'admin' },
    { staleTime: 5 * 60 * 1000 }
  )
)
```

--------------------------------

### Fetch Data with useQuery

Source: https://eden-query.xkel.me/docs/getting-started

Use the `useQuery` hook from `@tanstack/react-query` along with `useEden` to fetch data. The `queryOptions()` method generates the necessary query configuration.

```typescript
import { useQuery } from '@tanstack/react-query'
import { useEden } from '../lib/eden'

export function UserList() {
  const eden = useEden()

  const { data: users, isLoading } = useQuery(
    eden.users.get.queryOptions()
  )

  if (isLoading) return <div>Loading...</div>

  return (
    <ul>
      {users?.map((user) => (
        <li key={user.id}>{user.name} ({user.email})</li>
      ))}
    </ul>
  )
}

```

--------------------------------

### Read and Write Cache Data

Source: https://eden-query.xkel.me/docs/guides/query-keys

Demonstrates how to directly read cached data using `getQueryData` and write or update cached data using `setQueryData` with a specific query key.

```javascript
// Read cached data
const user = queryClient.getQueryData(
  eden.users({ id: '1' }).get.queryKey()
)

```

```javascript
// Write to cache
queryClient.setQueryData(
  eden.users({ id: '1' }).get.queryKey(),
  { id: '1', name: 'Updated Name', email: 'updated@example.com' }
)

```

--------------------------------

### Compare Mutation Implementation

Source: https://eden-query.xkel.me/docs/comparisons

Demonstrates how mutations and cache invalidation are handled in both libraries.

```typescript
const createUser = useMutation({
  ...eden.users.post.mutationOptions(),
  onSuccess: () => {
    queryClient.invalidateQueries({ queryKey: eden.users.get.queryKey() })
  }
})
```

```typescript
const createUser = eden.users.post.useMutation({
  onSuccess: () => {
    // Query invalidation is less explicit
  }
})
```

--------------------------------

### Create Infinite Query Options with infiniteQueryOptions

Source: https://eden-query.xkel.me/docs/api-reference/use-eden

Use `infiniteQueryOptions` for cursor-based pagination with `useInfiniteQuery`. It requires `getNextPageParam` and supports `initialCursor` and `getPreviousPageParam`.

```typescript
eden.route.get.infiniteQueryOptions(input, opts): InfiniteQueryOptions
```

```typescript
const eden = useEden()

const { data, fetchNextPage, hasNextPage } = useInfiniteQuery(
  eden.posts.get.infiniteQueryOptions(
    { limit: 10 },
    {
      getNextPageParam: (lastPage) => lastPage.nextCursor ?? undefined,
      initialCursor: null,
    }
  )
)
```

--------------------------------

### Create Test Wrapper Component

Source: https://eden-query.xkel.me/docs/guides/testing

Provides a wrapper component for testing that includes QueryClientProvider and EdenProvider.

```typescript
import { ReactNode } from 'react'
import { QueryClientProvider } from '@tanstack/react-query'
import { createEdenTanStackQuery } from 'eden-tanstack-react-query'
import type { App } from '@/lib/server'

export function createTestWrapper(mockClient: any) {
  const queryClient = createTestQueryClient()
  const { EdenProvider } = createEdenTanStackQuery<App>()

  function Wrapper({ children }: { children: ReactNode }) {
    return (
      <QueryClientProvider client={queryClient}>
        <EdenProvider client={mockClient} queryClient={queryClient}>
          {children}
        </EdenProvider>
      </QueryClientProvider>
    )
  }

  return { Wrapper, queryClient }
}
```

--------------------------------

### Available Query Key Methods

Source: https://eden-query.xkel.me/docs/guides/query-keys

Details the methods available for generating query keys and filters, including `queryKey`, `queryFilter`, `infiniteQueryKey`, `infiniteQueryFilter`, and `mutationKey`.

```APIDOC
## Available Methods

### queryKey()
Returns the query key for a specific route. Optionally accepts input for more specific targeting:
```
eden.users.get.queryKey()                              // all users queries
eden.users.get.queryKey({ role: 'admin' })  // specific input
eden.users({ id: '1' }).get.queryKey()                 // specific path params
```

### queryFilter()
Returns a filter object (including `queryKey`) for use with TanStack Query's filter-based methods:
```
eden.users.get.queryFilter()
eden.users.get.queryFilter({ role: 'admin' })
eden.users.get.queryFilter(undefined, { exact: true, stale: true })
```

`queryKey()` generates keys with `type: "query"`, which only matches regular queries. `queryFilter()` uses `type: "any"`, which matches both regular and infinite queries — making it better suited for broad cache invalidation.

### infiniteQueryKey()
Returns the query key for infinite queries:
```
eden.posts.get.infiniteQueryKey()
eden.posts.get.infiniteQueryKey({ limit: 10 })
```

### infiniteQueryFilter()
Returns a filter object for infinite queries:
```
eden.posts.get.infiniteQueryFilter()
eden.posts.get.infiniteQueryFilter({ category: 'tech' })
```

### mutationKey()
Returns the mutation key for a mutation route:
```
eden.users.post.mutationKey()
// => [['users', 'post']]
```
```

--------------------------------

### Query Key and Filter Usage

Source: https://eden-query.xkel.me/docs/guides/query-keys

Illustrates how to obtain query keys and filter objects for different query types. `queryFilter()` is suitable for broad cache invalidation as it matches both regular and infinite queries.

```javascript
eden.users.get.queryKey()                              // all users queries

```

```javascript
eden.users.get.queryKey({ role: 'admin' })  // specific input

```

```javascript
eden.users({ id: '1' }).get.queryKey()                 // specific path params

```

```javascript
eden.users.get.queryFilter()

```

```javascript
eden.users.get.queryFilter({ role: 'admin' })

```

```javascript
eden.users.get.queryFilter(undefined, { exact: true, stale: true })

```

--------------------------------

### Compare Server Definitions

Source: https://eden-query.xkel.me/docs/comparisons

Contrast Elysia server definition with tRPC router definition.

```typescript
const app = new Elysia()
  .get('/users', () => db.users.findMany())
  .get('/users/:id', ({ params }) => db.users.findUnique({
    where: { id: params.id }
  }))
  .post('/users', ({ body }) => db.users.create({ data: body }), {
    body: t.Object({ name: t.String(), email: t.String({ format: 'email' }) })
  })

export type App = typeof app
```

```typescript
const appRouter = t.router({
  users: t.router({
    list: t.procedure.query(() => db.users.findMany()),
    get: t.procedure
      .input(z.object({ id: z.string() }))
      .query(({ input }) => db.users.findUnique({ where: { id: input.id } })),
    create: t.procedure
      .input(z.object({ name: z.string(), email: z.string().email() }))
      .mutation(({ input }) => db.users.create({ data: input }))
  })
})

export type AppRouter = typeof appRouter
```

--------------------------------

### Query with Path Parameters

Source: https://eden-query.xkel.me/docs/guides/queries

For routes with dynamic segments (e.g., `/users/:id`), call the path segment as a function with the parameter.

```javascript
// GET /users/:id
const { data } = useQuery(
  eden.users({ id: userId }).get.queryOptions()
)
```

--------------------------------

### Create Typed Hooks

Source: https://eden-query.xkel.me/docs

Initialize the Eden TanStack Query hooks and client using the exported App type.

```typescript
import { createEdenTanStackQuery } from 'eden-tanstack-react-query'
import { treaty } from '@elysiajs/eden'
import type { App } from './server'

export const { EdenProvider, useEden, useEdenClient } = createEdenTanStackQuery<App>()
export const edenClient = treaty<App>('http://localhost:3000')
```

--------------------------------

### Path Parameters Handling

Source: https://eden-query.xkel.me/docs/api-reference

How to handle routes containing path parameters using the Eden proxy.

```APIDOC
## Path Parameters

### Description
Routes with path parameters are handled by passing an object to the route segment.

### Usage Example
```typescript
// Single path param: /users/:id
eden.users({ id: '123' }).get.queryOptions();

// Nested path params: /posts/:postId/comments/:commentId
eden.posts({ postId: '1' }).comments({ commentId: '2' }).get.queryOptions();
```
```

--------------------------------

### Implement EdenProvider in React

Source: https://eden-query.xkel.me/docs/api-reference/create-eden-tanstack-query

Wrap the application with the EdenProvider to supply the Eden and Query clients to the component tree.

```tsx
import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
import { EdenProvider, edenClient } from './lib/eden'

const queryClient = new QueryClient()

function App() {
  return (
    <QueryClientProvider client={queryClient}>
      <EdenProvider client={edenClient} queryClient={queryClient}>
        <YourApp />
      </EdenProvider>
    </QueryClientProvider>
  )
}
```

--------------------------------

### Compare Client Usage

Source: https://eden-query.xkel.me/docs/comparisons

Contrast client-side data fetching and mutation patterns between eden-tanstack-query and tRPC.

```typescript
const eden = useEden()
const { data } = useQuery(eden.users.get.queryOptions())

const createUser = useMutation({
  ...eden.users.post.mutationOptions(),
  onSuccess: () => queryClient.invalidateQueries(eden.users.get.queryFilter())
})
```

```typescript
const { data } = trpc.users.list.useQuery()

const utils = trpc.useUtils()
const createUser = trpc.users.create.useMutation({
  onSuccess: () => utils.users.list.invalidate()
})
```

--------------------------------

### Server-Side Prefetching with ensureQueryData

Source: https://eden-query.xkel.me/docs/guides/ssr

Use `ensureQueryData` in route loaders for server-side prefetching. Ensure your router and QueryClient are set up correctly.

```typescript
import { createFileRoute } from '@tanstack/react-router'
import { createEdenOptionsProxy } from 'eden-tanstack-react-query'
import { treaty } from '@elysiajs/eden'
import type { App } from '@/lib/server'

export const Route = createFileRoute('/users')({
  loader: async ({ context: { queryClient } }) => {
    const serverClient = treaty<App>(import.meta.env.VITE_API_URL)
    const eden = createEdenOptionsProxy<App>({ client: serverClient, queryClient })
    await queryClient.ensureQueryData(eden.users.get.queryOptions())
  },
  component: UsersPage
})
```

--------------------------------

### mutationOptions

Source: https://eden-query.xkel.me/docs/api-reference/use-eden

Creates type-safe options for useMutation.

```APIDOC
## POST mutationOptions

### Description
Creates type-safe options for useMutation.

### Parameters
#### Request Body
- **opts** (EdenMutationOptionsIn) - Optional - TanStack Query mutation options (excluding reserved).

### Returns
- **mutationKey** (EdenMutationKey) - Unique key based on route path.
- **mutationFn** (MutationFunction) - Mutation function via Eden client.
- **eden** (Object) - Route metadata.
```

--------------------------------

### Implement Providers for App Router

Source: https://eden-query.xkel.me/docs/guides/ssr

Creates a client-side provider component to manage the QueryClient and Eden client lifecycle.

```typescript
'use client'

import { useState } from 'react'
import { QueryClientProvider } from '@tanstack/react-query'
import { getQueryClient } from '@/lib/query-client'
import { EdenProvider, edenClient } from '@/lib/eden'

export function Providers({ children }: { children: React.ReactNode }) {
  const [queryClient] = useState(() => getQueryClient())

  return (
    <QueryClientProvider client={queryClient}>
      <EdenProvider client={edenClient} queryClient={queryClient}>
        {children}
      </EdenProvider>
    </QueryClientProvider>
  )
}
```

--------------------------------

### Define Basic Path Parameters in Elysia

Source: https://eden-query.xkel.me/docs/guides/path-parameters

Define a route with a single path parameter using Elysia's type system.

```typescript
import { Elysia, t } from 'elysia'

const app = new Elysia()
  .get('/users/:id', ({ params }) => ({
    id: params.id,
    name: `User ${params.id}`,
    email: `user${params.id}@example.com`
  }), {
    params: t.Object({
      id: t.String()
    })
  })
  .listen(3000)

export type App = typeof app
```

--------------------------------

### Define Elysia Server with Typed Routes

Source: https://eden-query.xkel.me/docs/getting-started

Create an Elysia server with typed routes. The `export type App = typeof app` line is crucial for enabling type inference on the client.

```typescript
import {
  Elysia,
  t
} from 'elysia'
import { cors } from '@elysiajs/cors'

const app = new Elysia()
  .use(cors())
  .get('/hello', () => ({ message: 'Hello from Elysia!' }))
  .get('/users', () => [
    { id: '1', name: 'Alice', email: 'alice@example.com' },
    { id: '2', name: 'Bob', email: 'bob@example.com' },
  ])
  .get('/users/:id', ({ params }) => ({
    id: params.id,
    name: `User ${params.id}`,
    email: `user${params.id}@example.com`,
  }))
  .post(
    '/users',
    ({ body }) => ({ id: String(Date.now()), ...body }),
    {
      body: t.Object({
        name: t.String(),
        email: t.String(),
      }),
    }
  )
  .listen(3000)

// This type export is what enables type inference on the client
export type App = typeof app

```

--------------------------------

### Infinite Query Filter Usage

Source: https://eden-query.xkel.me/docs/guides/query-keys

Demonstrates how to generate filter objects specifically for infinite queries using `infiniteQueryFilter()`.

```javascript
eden.posts.get.infiniteQueryFilter()

```

```javascript
eden.posts.get.infiniteQueryFilter({ category: 'tech' })

```

--------------------------------

### Create Query Options with queryOptions

Source: https://eden-query.xkel.me/docs/api-reference/use-eden

Use `queryOptions` to generate type-safe options for TanStack Query functions like `useQuery`. It accepts query parameters and optional TanStack Query configurations.

```typescript
eden.route.get.queryOptions(input?, opts?): QueryOptions
```

```typescript
const { data } = useQuery(eden.users.get.queryOptions())

const { data } = useQuery(
  eden.users.get.queryOptions(
    { role: 'admin' },
    { staleTime: 5 * 60 * 1000 }
  )
)

const { data } = useQuery(
  eden.users({ id: '123' }).get.queryOptions()
)

const { data } = useQuery(
  eden.users({ id: userId ?? '' }).get.queryOptions(
    userId ? undefined : skipToken
  )
)
```

--------------------------------

### Cache Operations with TanStack Query

Source: https://eden-query.xkel.me/docs/guides/query-keys

Illustrates how to perform various cache operations using Eden TanStack Query's generated keys with TanStack Query's client methods.

```APIDOC
## Cache Operations

### invalidateQueries
Mark queries as stale and trigger a refetch:
```javascript
const queryClient = useQueryClient()
const eden = useEden()

// Invalidate all users queries (partial matching)
queryClient.invalidateQueries({
  queryKey: eden.users.get.queryKey()
})

// Invalidate with queryFilter
queryClient.invalidateQueries(
  eden.users.get.queryFilter()
)

// Invalidate a specific user
queryClient.invalidateQueries({
  queryKey: eden.users({ id: '1' }).get.queryKey()
})
```

### cancelQueries
Cancel in-flight queries (useful for optimistic updates):
```javascript
await queryClient.cancelQueries({
  queryKey: eden.todos.get.queryKey()
})
```

### getQueryData / setQueryData
Read and write the cache directly:
```javascript
// Read cached data
const user = queryClient.getQueryData(
  eden.users({ id: '1' }).get.queryKey()
)

// Write to cache
queryClient.setQueryData(
  eden.users({ id: '1' }).get.queryKey(),
  { id: '1', name: 'Updated Name', email: 'updated@example.com' }
)
```

### removeQueries
Remove queries from the cache entirely:
```javascript
queryClient.removeQueries({
  queryKey: eden.users({ id: '1' }).get.queryKey()
})
```
```

--------------------------------

### Verify Query Keys for Path Params

Source: https://eden-query.xkel.me/docs/troubleshooting

Logs query keys to ensure unique identification for different path parameters.

```typescript
console.log(eden.users({ id: '1' }).get.queryKey())
// [['users', 'get'], { input: { id: '1' }, type: 'query' }]

console.log(eden.users({ id: '2' }).get.queryKey())
// [['users', 'get'], { input: { id: '2' }, type: 'query' }]
```

--------------------------------

### Create Test Query Client

Source: https://eden-query.xkel.me/docs/guides/testing

Utility function to create a new QueryClient instance for testing with disabled retries and garbage collection.

```typescript
import { QueryClient } from '@tanstack/react-query'

export function createTestQueryClient() {
  return new QueryClient({
    defaultOptions: {
      queries: { retry: false, gcTime: 0 },
      mutations: { retry: false }
    }
  })
}
```

--------------------------------

### Create Mock Eden Client

Source: https://eden-query.xkel.me/docs/guides/testing

Factory function to create a mock Eden client with mocked 'users' endpoint for testing.

```typescript
import { vi } from 'vitest'

export function createMockEdenClient() {
  return {
    users: Object.assign(
      (params: { id: string }) => ({
        get: vi.fn().mockResolvedValue({
          data: { id: params.id, name: 'User', email: 'user@example.com' },
          error: null
        }),
      }),
      {
        get: vi.fn().mockResolvedValue({
          data: [
            { id: '1', name: 'Alice', email: 'alice@example.com' },
            { id: '2', name: 'Bob', email: 'bob@example.com' }
          ],
          error: null
        }),
        post: vi.fn().mockResolvedValue({
          data: { id: '3', name: 'New User', email: 'new@example.com' },
          error: null
        }),
      }
    )
  }
}
```

--------------------------------

### Handle Path Parameters as Strings

Source: https://eden-query.xkel.me/docs/troubleshooting

Ensures path parameters are passed as strings to match URL requirements.

```typescript
// Error: number not assignable to string
eden.users({ id: 123 }).get.queryOptions()

// Correct
eden.users({ id: String(userId) }).get.queryOptions()
```

--------------------------------

### Create Data with useMutation

Source: https://eden-query.xkel.me/docs/getting-started

Use the `useMutation` hook to create or update data. The `mutationOptions()` method provides the configuration, and `queryClient.invalidateQueries` can be used in `onSuccess` to refetch data.

```typescript
import { useMutation, useQueryClient } from '@tanstack/react-query'
import { useEden } from '../lib/eden'

export function CreateUser() {
  const eden = useEden()
  const queryClient = useQueryClient()

  const createUser = useMutation({
    ...eden.users.post.mutationOptions(),
    onSuccess: () => {
      queryClient.invalidateQueries({
        queryKey: eden.users.get.queryKey(),
      })
    },
  })

  return (
    <button
      onClick={() => createUser.mutate({ name: 'Alice', email: 'alice@example.com' })}
      disabled={createUser.isPending}
    >
      Create User
    </button>
  )
}

```

--------------------------------

### Path Parameter Handling

Source: https://eden-query.xkel.me/docs/api-reference

Syntax for accessing routes that contain dynamic path parameters.

```typescript
// For routes with path params like /users/:id
eden.users({ id: '123' }).get.queryOptions()

// Nested params: /posts/:postId/comments/:commentId
eden.posts({ postId: '1' }).comments({ commentId: '2' }).get.queryOptions()
```

--------------------------------

### Test User List Component

Source: https://eden-query.xkel.me/docs/guides/testing

Renders a UserList component and asserts that user data is displayed after loading.

```typescript
import { describe, it, expect } from 'vitest'
import { render, screen, waitFor } from '@testing-library/react'
import { useQuery } from '@tanstack/react-query'
import { useEden } from '@/lib/eden'
import { createTestWrapper, createMockEdenClient } from '../utils'

function UserList() {
  const eden = useEden()
  const { data: users, isPending } = useQuery(eden.users.get.queryOptions())

  if (isPending) return <div>Loading...</div>
  return (
    <ul>
      {users?.map(user => <li key={user.id}>{user.name}</li>)}
    </ul>
  )
}

describe('UserList', () => {
  it('renders users after loading', async () => {
    const mockClient = createMockEdenClient()
    const { Wrapper } = createTestWrapper(mockClient)

    render(<UserList />, { wrapper: Wrapper })

    expect(screen.getByText('Loading...')).toBeInTheDocument()

    await waitFor(() => {
      expect(screen.getByText('Alice')).toBeInTheDocument()
      expect(screen.getByText('Bob')).toBeInTheDocument()
    })
  })
})
```

--------------------------------

### Implement Infinite Queries

Source: https://eden-query.xkel.me/docs

Use infiniteQueryOptions for paginated data fetching.

```typescript
import { useInfiniteQuery } from '@tanstack/react-query'

const { data, fetchNextPage, hasNextPage } = useInfiniteQuery(
  eden.posts.get.infiniteQueryOptions(
    { limit: 10 },
    {
      getNextPageParam: (lastPage) => lastPage.nextCursor ?? undefined,
      initialPageParam: null,
    }
  )
)
```

--------------------------------

### Update Queries and Mutations

Source: https://eden-query.xkel.me/docs/comparisons

Syntax changes for queries and mutations during migration.

```typescript
// Before: eden.users.get.useQuery()
// After:
const eden = useEden()
const { data } = useQuery(eden.users.get.queryOptions())
```

```typescript
// Before: eden.users.post.useMutation()
// After:
const mutation = useMutation(eden.users.post.mutationOptions())
```

--------------------------------

### initialCursor Option for Infinite Queries

Source: https://eden-query.xkel.me/docs/guides/infinite-queries

Sets the cursor value for the initial page fetch. The appropriate value depends on your API's cursor implementation (e.g., `null`, `0`, or `''`).

```javascript
{
  initialCursor: null  // or 0, '', depending on your API
}
```

--------------------------------

### Define Combined Path and Query Parameters in Elysia

Source: https://eden-query.xkel.me/docs/guides/path-parameters

Define a route that utilizes both path parameters and optional query parameters.

```typescript
const app = new Elysia()
  .get('/users/:id/posts', ({ params, query }) => ({
    userId: params.id,
    posts: [],
    page: query.page ?? 1,
    limit: query.limit ?? 10
  }), {
    params: t.Object({
      id: t.String()
    }),
    query: t.Object({
      page: t.Optional(t.Number()),
      limit: t.Optional(t.Number())
    })
  })
```

--------------------------------

### Query with Input Parameters

Source: https://eden-query.xkel.me/docs

Pass query parameters or request body to the query options factory.

```typescript
// Query params: GET /users?role=admin
eden.users.get.queryOptions({ role: 'admin' })

// With TanStack Query options
eden.users.get.queryOptions(
  { role: 'admin' },
  { staleTime: 5 * 60 * 1000 }
)
```

--------------------------------

### Import App Type

Source: https://eden-query.xkel.me/docs/troubleshooting

Uses import type to ensure proper type availability.

```typescript
import type { App } from '../server'
```

--------------------------------

### Define base Eden query options

Source: https://eden-query.xkel.me/docs/api-reference/types

Interface for base options used in Eden requests.

```typescript
interface EdenQueryBaseOptions {
  eden?: {
    /** Abort request on component unmount */
    abortOnUnmount?: boolean
  }
}
```

--------------------------------

### Define Elysia Server

Source: https://eden-query.xkel.me/docs

Define the server routes and export the App type for type inference.

```typescript
import { Elysia, t } from 'elysia'

const app = new Elysia()
  .get('/users', () => [
    { id: '1', name: 'Alice' },
    { id: '2', name: 'Bob' }
  ])
  .get('/users/:id', ({ params }) => ({
    id: params.id,
    name: `User ${params.id}`
  }))
  .post('/users', ({ body }) => ({
    id: String(Date.now()),
    ...body
  }), {
    body: t.Object({ name: t.String() })
  })
  .listen(3000)

export type App = typeof app
```

--------------------------------

### Partial Matching for Invalidation

Source: https://eden-query.xkel.me/docs/guides/query-keys

Illustrates how partial matching with query keys can be used for broad invalidation. A key without input matches all queries for that route.

```javascript
// Invalidates ALL users queries, regardless of input
queryClient.invalidateQueries({
  queryKey: eden.users.get.queryKey()
})

```

```javascript
// Only invalidates the specific query with role='admin'
queryClient.invalidateQueries({
  queryKey: eden.users.get.queryKey({ role: 'admin' })
})

```

--------------------------------

### Handle Path Parameters

Source: https://eden-query.xkel.me/docs

Access routes with dynamic path parameters using function calls.

```typescript
// Route: /users/:id
eden.users({ id: '123' }).get.queryOptions()

// Nested: /posts/:postId/comments/:commentId
eden.posts({ postId: '1' }).comments({ commentId: '2' }).get.queryOptions()
```

--------------------------------

### Fetch Data with Path Parameters

Source: https://eden-query.xkel.me/docs/getting-started

For routes with path parameters like `/users/:id`, call the route segment as a function, passing the parameter values.

```typescript
const { data: user } = useQuery(
  eden.users({ id: userId }).get.queryOptions()
)

```

--------------------------------

### Define Query and Mutation Keys

Source: https://eden-query.xkel.me/docs/api-reference/types

Structures for TanStack Query cache keys and associated metadata.

```typescript
type EdenQueryKey<TInput = unknown> =
  | [path: string[]]
  | [path: string[], meta: EdenQueryKeyMeta<TInput>]

// Examples:
[['users', 'get']]
[['users', 'get'], { input: { role: 'admin' } }]
[['posts', 'get'], { input: { limit: 10 }, type: 'infinite' }]
```

```typescript
type EdenMutationKey = [path: string[]]

// Example:
[['users', 'post']]
```

```typescript
type EdenQueryKeyMeta<TInput = unknown> = {
  input?: TInput
  type?: 'query' | 'infinite'
}
```

```typescript
type QueryType = 'query' | 'infinite' | 'any'
```

--------------------------------

### Define QueryClient Factory

Source: https://eden-query.xkel.me/docs/guides/ssr

Ensures a singleton QueryClient instance is used on the client while creating a fresh instance per request on the server.

```typescript
import { QueryClient } from '@tanstack/react-query'

function makeQueryClient() {
  return new QueryClient({
    defaultOptions: {
      queries: {
        staleTime: 60 * 1000,
      }
    }
  })
}

let browserQueryClient: QueryClient | undefined

export function getQueryClient() {
  if (typeof window === 'undefined') {
    return makeQueryClient()
  }
  if (!browserQueryClient) {
    browserQueryClient = makeQueryClient()
  }
  return browserQueryClient
}
```