```js
// @noErrors
import {
	DedupeCache,
	dedupe,
	getRequestEvent,
	getUnderlyingDedupeFunction,
	read
} from '$app/server';
```

## DedupeCache

Defines the cache of functions for this request.

<div class="ts-block">

```dts
class DedupeCache {/*…*/}
```

<div class="ts-block-property">

```dts
private _values;
```

<div class="ts-block-property-details"></div>
</div>

<div class="ts-block-property">

```dts
has<F extends (...args: any[]) => any>(fn: F, ...args: Parameters<F>): boolean;
```

<div class="ts-block-property-details">

<div class="ts-block-property-bullets">

- `fn` - The function to check.
- `args` - The arguments to check.
- <span class="tag">returns</span> - Whether the function call is cached.

</div>

Check if a given function call is cached.

</div>
</div>

<div class="ts-block-property">

```dts
remove<F extends (...args: any[]) => any>(fn: F, ...args: Parameters<F>): boolean;
```

<div class="ts-block-property-details">

<div class="ts-block-property-bullets">

- `fn` - The function to remove.
- `args` - The arguments to remove.
- <span class="tag">returns</span> - Whether the function call was removed.

</div>

Remove a function call from the cache.

</div>
</div></div>



## dedupe

Creates a deduplicated function. This means that within a request, if multiple
calls are made with the same arguments, the underlying function will only be
called once and the result will be cached and returned for all subsequent calls.

<div class="ts-block">

```dts
function dedupe<F extends (...args: any[]) => any>(
	fn: F
): F;
```

</div>



## getRequestEvent

<blockquote class="since note">

Available since 2.20.0

</blockquote>

Returns the current `RequestEvent`. Can be used inside server hooks, server `load` functions, actions, and endpoints (and functions called by them).

In environments without [`AsyncLocalStorage`](https://nodejs.org/api/async_context.html#class-asynclocalstorage), this must be called synchronously (i.e. not after an `await`).

<div class="ts-block">

```dts
function getRequestEvent(): RequestEvent<
	Partial<Record<string, string>>,
	string | null
>;
```

</div>



## getUnderlyingDedupeFunction

Gets the underlying function that was turned into a proxy.

<div class="ts-block">

```dts
function getUnderlyingDedupeFunction<
	F extends (...args: any[]) => any
>(fn: F): F;
```

</div>



## read

<blockquote class="since note">

Available since 2.4.0

</blockquote>

Read the contents of an imported asset from the filesystem

```js
// @errors: 7031
import { read } from '$app/server';
import somefile from './somefile.txt';

const asset = read(somefile);
const text = await asset.text();
```

<div class="ts-block">

```dts
function read(asset: string): Response;
```

</div>