```js
// @noErrors
import { integrity } from '$app/integrity';
```

## integrity

<blockquote class="since note">

Available since 2.54.0

</blockquote>

Look up the SRI integrity hash for a Vite-processed asset URL.
Returns the integrity string (e.g. `"sha384-..."`) during SSR when
[`subresourceIntegrity`](/docs/kit/configuration#subresourceIntegrity) is enabled,
or `undefined` on the client and in dev.

```svelte
<script>
	import scriptUrl from "./my-script.js?url";
	import { integrity } from '$app/integrity';
</script>

<svelte:head>
	<script src="{scriptUrl}" type="module" integrity={integrity(scriptUrl)} crossorigin="anonymous"></script>
</svelte:head>
```

<div class="ts-block">

```dts
function integrity(url: string): string | undefined;
```

</div>