***

title: "AssetPreviewStrategy"
generated: true
---------------

<GenerationInfo sourceFile="packages/core/src/config/asset-preview-strategy/asset-preview-strategy.ts" sourceLine="25" packageName="@vendure/core" />

The AssetPreviewStrategy determines how preview images for assets are created. For image
assets, this would usually typically involve resizing to sensible dimensions. Other file types
could be previewed in a variety of ways, e.g.:

* waveform images generated for audio files
* preview images generated for pdf documents
* watermarks added to preview images

:::info

This is configured via the `assetOptions.assetPreviewStrategy` property of
your VendureConfig.

:::

```ts title="Signature"
interface AssetPreviewStrategy extends InjectableStrategy {
    generatePreviewImage(ctx: RequestContext, mimeType: string, data: Buffer): Promise<Buffer>;
}
```

* Extends: [`InjectableStrategy`](/current/core/reference/typescript-api/common/injectable-strategy#injectablestrategy)

<div className="members-wrapper">

### generatePreviewImage

\<MemberInfo kind="method" type={`(ctx: <a href='/current/core/reference/typescript-api/request/request-context#requestcontext'>RequestContext</a>, mimeType: string, data: Buffer) => Promise<Buffer>`}   />

</div>