---
title: "Expo Image and Asset Instrumentation"
description: "Automatic performance spans for expo-image and expo-asset."
url: https://docs.sentry.io/platforms/react-native/tracing/instrumentation/expo-resources/
---

# Expo Image and Asset Instrumentation | Sentry for React Native

Image and asset loading times directly affect how quickly your app feels responsive. The SDK can automatically create performance spans for `expo-image` and `expo-asset` operations so you can see exactly how long prefetching and loading takes within your existing traces.

## [Expo Image](https://docs.sentry.io/platforms/react-native/tracing/instrumentation/expo-resources.md#expo-image)

Wrap the `Image` class from `expo-image` once at app startup to instrument `Image.prefetch()` and `Image.loadAsync()`:

`App.js`

```javascript
import { Image } from "expo-image";
import * as Sentry from "@sentry/react-native";

Sentry.wrapExpoImage(Image);
```

After wrapping, every call to `Image.prefetch()` creates a `resource.image.prefetch` span, and every call to `Image.loadAsync()` creates a `resource.image.load` span. The spans are automatically linked to the active trace.

Span attributes include:

* `image.url` — the image URL (for single-image operations)
* `image.url_count` — number of URLs (for batch prefetch)

## [Expo Asset](https://docs.sentry.io/platforms/react-native/tracing/instrumentation/expo-resources.md#expo-asset)

Wrap the `Asset` class from `expo-asset` once at app startup to instrument `Asset.loadAsync()`:

`App.js`

```javascript
import { Asset } from "expo-asset";
import * as Sentry from "@sentry/react-native";

Sentry.wrapExpoAsset(Asset);
```

After wrapping, every call to `Asset.loadAsync()` creates a `resource.asset` span with an `asset.count` attribute.

## [Notes](https://docs.sentry.io/platforms/react-native/tracing/instrumentation/expo-resources.md#notes)

* Both `wrapExpoImage` and `wrapExpoAsset` are safe to call multiple times — the SDK guards against double-wrapping.
* Spans are only created when a trace is active. If you're not using [tracing](https://docs.sentry.io/platforms/react-native/tracing.md), no spans are created and there's no overhead.
* `expo-image` and `expo-asset` are peer dependencies — the SDK does not require them to be installed.