

# ClientHeaderMappingCallback

<div class="api-docs__separator">

---

</div><div class="api-docs__import">

```ts
import { ClientHeaderMappingCallback } from "@hyper-fetch/core"
```

</div><div class="api-docs__section">

## Description

</div><div class="api-docs__description"><span class="api-docs__do-not-parse">



</span></div><p class="api-docs__definition">

Defined in [client/fetch.client.types.ts:33](https://github.com/BetterTyped/hyper-fetch/blob/3fe127e9/packages/core/src/client/fetch.client.types.ts#L33)

</p><div class="api-docs__section">

## Preview

</div><div class="api-docs__preview type single">

```ts
type ClientHeaderMappingCallback = <T>(command: T) => HeadersInit;
```

</div><div class="api-docs__section">

## Structure

</div><div class="api-docs__returns">

```ts
(command: T) => HeadersInit
```

</div>