Refactor mobile to fix dependency resolution and add polyfills

Update Expo and React dependencies to compatible versions. Create a
custom Metro config to resolve module conflicts in the workspace and
map Jest modules to local node_modules.

Add a SharedArrayBuffer polyfill for older runtimes and introduce an
adapter for expo-notifications to abstract direct imports.

apps/mobile/App.tsx

@@ -1,5 +1,5 @@
 import { useEffect } from 'react';
-import * as Notifications from 'expo-notifications';
+import * as Notifications from './src/services/expoNotifications';
 import AppNavigator from './src/navigation/AppNavigator';
 
 export default function App() {

apps/mobile/index.ts

@@ -1,3 +1,4 @@
+import './src/polyfills/sharedArrayBuffer';
 import { registerRootComponent } from 'expo';
 
 import App from './App';

apps/mobile/jest.config.cjs

@@ -1,4 +1,12 @@
 module.exports = {
   preset: 'jest-expo',
   testMatch: ['**/__tests__/**/*.test.[jt]s?(x)'],
+  moduleNameMapper: {
+    '^react$': '<rootDir>/node_modules/react',
+    '^react-test-renderer$': '<rootDir>/node_modules/react-test-renderer',
+    '^react-native-safe-area-context$': '<rootDir>/node_modules/react-native-safe-area-context',
+    '^react-native-screens$': '<rootDir>/node_modules/react-native-screens',
+    '^@react-native-async-storage/async-storage$':
+      '<rootDir>/node_modules/@react-native-async-storage/async-storage',
+  },
 };

apps/mobile/metro.config.js

@@ -0,0 +1,27 @@
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { getDefaultConfig } from 'expo/metro-config.js';
+
+const projectRoot = path.dirname(fileURLToPath(import.meta.url));
+const workspaceRoot = path.resolve(projectRoot, '../..');
+
+const config = getDefaultConfig(projectRoot);
+
+config.resolver.disableHierarchicalLookup = true;
+config.resolver.nodeModulesPaths = [
+  path.resolve(projectRoot, 'node_modules'),
+  path.resolve(workspaceRoot, 'node_modules'),
+];
+config.resolver.extraNodeModules = {
+  react: path.resolve(projectRoot, 'node_modules/react'),
+  'react-test-renderer': path.resolve(projectRoot, 'node_modules/react-test-renderer'),
+  'react-native-safe-area-context': path.resolve(projectRoot, 'node_modules/react-native-safe-area-context'),
+  'react-native-screens': path.resolve(projectRoot, 'node_modules/react-native-screens'),
+  '@react-native-async-storage/async-storage': path.resolve(
+    projectRoot,
+    'node_modules/@react-native-async-storage/async-storage',
+  ),
+  'expo-application': path.resolve(projectRoot, 'node_modules/expo-notifications/node_modules/expo-application'),
+};
+
+export default config;

apps/mobile/package.json

@@ -13,20 +13,20 @@
     "test": "jest"
   },
   "dependencies": {
-    "@react-native-async-storage/async-storage": "^3.0.2",
+    "@react-native-async-storage/async-storage": "2.2.0",
     "@react-navigation/native": "^7.2.4",
     "@react-navigation/native-stack": "^7.14.14",
     "@timetoleave/api-client": "*",
     "@timetoleave/core": "*",
     "expo": "~54.0.33",
-    "expo-calendar": "^55.0.14",
-    "expo-location": "^55.1.9",
-    "expo-notifications": "^55.0.22",
+    "expo-calendar": "~15.0.8",
+    "expo-location": "~19.0.8",
+    "expo-notifications": "~0.32.17",
     "expo-status-bar": "~3.0.9",
-    "react": "19.2.4",
+    "react": "19.1.0",
     "react-native": "0.81.5",
-    "react-native-safe-area-context": "^5.7.0",
-    "react-native-screens": "^4.24.0"
+    "react-native-safe-area-context": "~5.6.0",
+    "react-native-screens": "~4.16.0"
   },
   "devDependencies": {
     "@eslint/js": "^9.39.4",
@@ -36,7 +36,7 @@
     "eslint-plugin-react": "^7.37.5",
     "jest": "^29.7.0",
     "jest-expo": "~54.0.0",
-    "react-test-renderer": "19.2.4",
+    "react-test-renderer": "19.1.0",
     "ts-jest": "^29.4.9",
     "typescript": "~5.9.2",
     "typescript-eslint": "^8.59.3"

apps/mobile/src/__tests__/eventStore.test.ts

@@ -12,7 +12,7 @@ import {
   rescheduleAllNotifications
 } from '../store/eventStore';
 import { calculateLeaveByTime } from '../services/notifications';
-import * as Notifications from 'expo-notifications';
+import * as Notifications from '../services/expoNotifications';
 
 // Mock AsyncStorage
 jest.mock('@react-native-async-storage/async-storage', () => ({
@@ -21,8 +21,8 @@ jest.mock('@react-native-async-storage/async-storage', () => ({
   removeItem: jest.fn(),
 }));
 
-// Mock expo-notifications
-jest.mock('expo-notifications', () => ({
+// Mock notification adapter
+jest.mock('../services/expoNotifications', () => ({
   getAllScheduledNotificationsAsync: jest.fn(),
   cancelScheduledNotificationAsync: jest.fn(),
   cancelAllScheduledNotificationsAsync: jest.fn(),

apps/mobile/src/__tests__/notifications.test.ts

@@ -1,6 +1,6 @@
 // Tests for notification service
-// Mock expo-notifications before importing
-jest.mock('expo-notifications', () => ({
+// Mock notification adapter before importing
+jest.mock('../services/expoNotifications', () => ({
   setNotificationHandler: jest.fn(),
   requestPermissionsAsync: jest.fn().mockResolvedValue({ status: 'granted' }),
   scheduleNotificationAsync: jest.fn().mockResolvedValue({ identifier: 'mock-id' }),

apps/mobile/src/polyfills/sharedArrayBuffer.ts

@@ -0,0 +1,78 @@
+const globalScope = globalThis as Record<string, unknown>;
+const stringPrototype = String.prototype as typeof String.prototype & {
+  isWellFormed?: () => boolean;
+  toWellFormed?: () => string;
+};
+
+const arrayBufferByteLength = Object.getOwnPropertyDescriptor(ArrayBuffer.prototype, 'byteLength')?.get;
+
+function toWellFormedString(value: string): string {
+  let result = '';
+
+  for (let index = 0; index < value.length; index += 1) {
+    const code = value.charCodeAt(index);
+
+    if (code >= 0xd800 && code <= 0xdbff) {
+      const next = value.charCodeAt(index + 1);
+      if (next >= 0xdc00 && next <= 0xdfff) {
+        result += value[index] + value[index + 1];
+        index += 1;
+      } else {
+        result += '\uFFFD';
+      }
+    } else if (code >= 0xdc00 && code <= 0xdfff) {
+      result += '\uFFFD';
+    } else {
+      result += value[index];
+    }
+  }
+
+  return result;
+}
+
+if (typeof stringPrototype.toWellFormed !== 'function') {
+  Object.defineProperty(String.prototype, 'toWellFormed', {
+    configurable: true,
+    value() {
+      return toWellFormedString(String(this));
+    },
+  });
+}
+
+if (typeof stringPrototype.isWellFormed !== 'function') {
+  Object.defineProperty(String.prototype, 'isWellFormed', {
+    configurable: true,
+    value() {
+      const value = String(this);
+      return toWellFormedString(value) === value;
+    },
+  });
+}
+
+if (!Object.getOwnPropertyDescriptor(ArrayBuffer.prototype, 'resizable')) {
+  Object.defineProperty(ArrayBuffer.prototype, 'resizable', {
+    configurable: true,
+    get() {
+      return false;
+    },
+  });
+}
+
+if (typeof globalScope.SharedArrayBuffer === 'undefined') {
+  class SharedArrayBufferPolyfill extends ArrayBuffer {
+    get byteLength() {
+      return arrayBufferByteLength?.call(this) ?? 0;
+    }
+
+    get growable() {
+      return false;
+    }
+  }
+
+  Object.defineProperty(SharedArrayBufferPolyfill.prototype, Symbol.toStringTag, {
+    configurable: true,
+    value: 'SharedArrayBuffer',
+  });
+
+  globalScope.SharedArrayBuffer = SharedArrayBufferPolyfill;
+}

apps/mobile/src/services/expoNotifications.ts

@@ -0,0 +1,12 @@
+export { requestPermissionsAsync } from 'expo-notifications/build/NotificationPermissions.js';
+export { setNotificationHandler } from 'expo-notifications/build/NotificationsHandler.js';
+export { default as getAllScheduledNotificationsAsync } from 'expo-notifications/build/getAllScheduledNotificationsAsync.js';
+export { default as cancelScheduledNotificationAsync } from 'expo-notifications/build/cancelScheduledNotificationAsync.js';
+export { default as cancelAllScheduledNotificationsAsync } from 'expo-notifications/build/cancelAllScheduledNotificationsAsync.js';
+export { default as scheduleNotificationAsync } from 'expo-notifications/build/scheduleNotificationAsync.js';
+export { SchedulableTriggerInputTypes } from 'expo-notifications/build/Notifications.types.js';
+export type {
+  NotificationBehavior,
+  NotificationRequest,
+  NotificationRequestInput,
+} from 'expo-notifications/build/Notifications.types.js';

apps/mobile/src/services/notifications.ts

@@ -1,5 +1,5 @@
-import * as Notifications from 'expo-notifications';
-import { SchedulableTriggerInputTypes } from 'expo-notifications';
+import * as Notifications from './expoNotifications';
+import { SchedulableTriggerInputTypes } from './expoNotifications';
 import type { Event, Journey, ReminderSettings } from '@timetoleave/core';
 
 // Register for push notification permissions

apps/mobile/src/store/eventStore.ts

@@ -1,7 +1,7 @@
 import AsyncStorage from '@react-native-async-storage/async-storage';
 import type { Event, Station, ReminderSettings } from '@timetoleave/core';
-import * as Notifications from 'expo-notifications';
-import { SchedulableTriggerInputTypes } from 'expo-notifications';
+import * as Notifications from '../services/expoNotifications';
+import { SchedulableTriggerInputTypes } from '../services/expoNotifications';
 
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