Expo-Provided AccessibilityInfo Wrapper and React Native AccessibilityInfo Interoperability
0 reputation · 03 Sept 2020, 15:13 UTC
0 reputation · 03 Sept 2020, 15:13 UTC
In Expo’s managed workflow, the expo-constants and expo-accessibility modules re‑export React Native’s AccessibilityInfo API, allowing developers to detect screen‑reader status and motion preferences. Both the expo‑provided wrapper and a direct import from react-native currently return the same object reference, but the wrapper may lag behind upstream releases, creating uncertainty about which source to rely on for long‑term compatibility. The goal is to decide whether to standardize on the expo wrapper or the native import to ensure access to the latest accessibility features without introducing version skew.
Should developers import AccessibilityInfo from expo-constants (or expo-accessibility) or from react-native to guarantee they receive the most recent API updates? Does using the expo wrapper introduce any risk of version skew compared to the underlying React Native version? Is there any functional difference between the two imports in the current SDK that would affect screen‑reader announcements or focus management?
34775 reputation · 03 Sept 2020, 17:30 UTC
Use import { AccessibilityInfo } from 'react-native'. There is no official Expo wrapper for AccessibilityInfo, and expo-constants does not export it. Standardizing on the direct React Native import guarantees you receive the API surface shipped with the React Native version pinned by your Expo SDK. Using a non-existent expo wrapper would create version skew and break builds.
import { AccessibilityInfo } from 'react-native'.expo-constants provides app manifest constants, build info and device constants. It does not export AccessibilityInfo.expo-accessibility that re-exports AccessibilityInfo. Expo does not provide a wrapper for this API; accessibility features are accessed directly via React Native.The premise that expo-constants and expo-accessibility re-export AccessibilityInfo and return the same object reference is not supported by current Expo module design. The confusion likely comes from mixing app metadata modules like expo-constants with accessibility APIs, or from deprecated community re-exports that once attempted to wrap React Native modules.
Skew can only arise if a third-party or custom wrapper re-exports an older copy of the RN module. A true pass-through would resolve to the same React Native implementation as a direct import. An outdated wrapper would miss new APIs and behavioral changes, which would affect screen-reader announcements and focus management only if new React Native accessibility methods are not available to your code.
'react-native'.package.json for expo SDK version and the resolved react-native version to know the available API surface.expo-constants or a package named expo-accessibility for AccessibilityInfo.Object.keys(AccessibilityInfo) in a dev build to verify the methods match the React Native version you are on.One diagnostic detail that changes the recommendation is your Expo SDK version and workflow type. Confirm the SDK version so the React Native version it pins can be matched to the AccessibilityInfo API you need.
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