feat: Support expo-localization 14 onwards (#2697)

* Support expo-localization 14 onwards

* changeset

Author: robbie-c

.changeset/ripe-bobcats-ask.md

@@ -0,0 +1,5 @@
+---
+'posthog-react-native': patch
+---
+
+Support getting locale and timezone from expo-localization >= 14

packages/react-native/src/native-deps.tsx

@@ -63,8 +63,34 @@ export const getAppProperties = (): PostHogCustomAppProperties => {
   }
 
   if (OptionalExpoLocalization) {
-    properties.$locale = OptionalExpoLocalization.locale
-    properties.$timezone = OptionalExpoLocalization.timezone
+    // expo-localization >= 14 use functions to get these results, older versions use JS getters
+    // https://github.com/expo/expo/blob/sdk-54/packages/expo-localization/CHANGELOG.md#1400--2022-10-25
+    // this type below supports both variants, and type-checks with older and newer versions of expo-localization
+    const optionalExpoLocalization: {
+      locale?: string
+      getLocales?: () => {
+        languageTag: string
+      }[]
+      timezone?: string
+      getCalendars?: () => {
+        timeZone: string | null
+      }[]
+    } = OptionalExpoLocalization
+
+    let locale = optionalExpoLocalization.locale
+    if (!locale && optionalExpoLocalization.getLocales) {
+      locale = optionalExpoLocalization.getLocales()[0]?.languageTag
+    }
+    if (locale) {
+      properties.$locale = locale
+    }
+    let timezone: string | undefined | null = optionalExpoLocalization.timezone
+    if (!timezone && optionalExpoLocalization.getCalendars) {
+      timezone = optionalExpoLocalization.getCalendars()[0]?.timeZone
+    }
+    if (timezone) {
+      properties.$timezone = timezone
+    }
   } else if (OptionalReactNativeLocalize) {
     const localesFn = OptionalReactNativeLocalize.getLocales
     if (localesFn) {