fix: Do not try to load the expo-file-system package on the Web targe…

…t since it's not supported (#158)

posthog-react-native/CHANGELOG.md

@@ -1,6 +1,7 @@
 ## Next
 
-1. if `react-native-device-info` is available for the Web target, do not set `unknown` for all properties.
+1. Do not try to load the `expo-file-system` package on the Web target since it's not supported.
+2. if `react-native-device-info` is available for the Web target, do not set `unknown` for all properties.
 
 # 2.10.1 - 2024-01-15
 

posthog-react-native/src/optional/OptionalExpoFileSystem.ts

@@ -1,7 +1,15 @@
 import type ExpoFileSystem from 'expo-file-system'
+import { Platform } from 'react-native'
 
 export let OptionalExpoFileSystem: typeof ExpoFileSystem | undefined = undefined
 
 try {
-  OptionalExpoFileSystem = require('expo-file-system') // No Web support
+  // do not try to load expo-file-system on web, otherwise it will throw an error
+  // Error: The method or property expo-file-system.writeAsStringAsync is not available on web
+  // See https://github.com/PostHog/posthog-js-lite/issues/140
+  // Once expo-file-system is supported on web, we can remove this try/catch block
+  // For now, use the react-native-async-storage/async-storage package instead
+  if (Platform.OS !== 'web') {
+    OptionalExpoFileSystem = require('expo-file-system') // No Web support
+  }
 } catch (e) {}