---
url: >-
  https://adk.nht.io/api/@nhtio/adk/batteries/sandbox/type-aliases/MimeResolver.md
description: >-
  MIME resolver; `undefined` means the resolver declines and a later resolver
  may decide.
---

# Type Alias: MimeResolver

```ts
type MimeResolver = (ctx: {
  declared?: string;
  path: string;
  peek: (bytes: number) => Promise<Uint8Array>;
}) => string | undefined | Promise<string | undefined>;
```

Defined in: [src/batteries/sandbox/contracts/mime\_resolver.ts:4](https://github.com/NHTIO/ADK/blob/v1.20260824.1/src/src/batteries/sandbox/contracts/mime_resolver.ts#L4)

MIME resolver; `undefined` means the resolver declines and a later resolver may decide.

## Parameters

| Parameter       | Type                                                                                                     | Description                                                           |
| --------------- | -------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------- |
| `ctx`           | { `declared?`: `string`; `path`: `string`; `peek`: (`bytes`: `number`) => `Promise`<`Uint8Array`>; } | -                                                                     |
| `ctx.declared?` | `string`                                                                                                 | -                                                                     |
| `ctx.path`      | `string`                                                                                                 | -                                                                     |
| `ctx.peek`      | (`bytes`: `number`) => `Promise`<`Uint8Array`>                                                         | Read a bounded prefix only; this callback cannot read the whole file. |

## Returns

`string` | `undefined` | `Promise`<`string` | `undefined`>