onekeyhq/app-monorepo/1k-cross-platform

// ✅ CORRECT
import platformEnv from '@onekeyhq/shared/src/platformEnv';
if (platformEnv.isNative) {
  // React Native specific code
}
if (platformEnv.isWeb) {
  // Web specific code
}
if (platformEnv.isDesktop) {
  // Desktop (Electron) specific code
}
if (platformEnv.isExtension) {
  // Browser extension specific code
}
// ❌ FORBIDDEN - Direct platform checks
if (typeof window !== 'undefined') { }
if (process.env.REACT_APP_PLATFORM === 'web') { }

platformEnv.isNative      // React Native (iOS or Android)
platformEnv.isWeb         // Web browser
platformEnv.isDesktop     // Electron desktop app
platformEnv.isExtension   // Browser extension
platformEnv.isIOS         // iOS specifically
platformEnv.isAndroid     // Android specifically
platformEnv.isWebEmbed    // Embedded web components

MyComponent/
├── index.ts              # Main entry, common logic
├── MyComponent.tsx       # Shared component
├── MyComponent.native.tsx    # React Native specific
├── MyComponent.web.tsx       # Web specific
├── MyComponent.desktop.tsx   # Desktop specific
└── MyComponent.ext.tsx       # Extension specific

// storage.ts - shared interface
export interface IStorage {
  get(key: string): Promise<string | null>;
  set(key: string, value: string): Promise<void>;
}
// storage.native.ts
import AsyncStorage from '@react-native-async-storage/async-storage';
export const storage: IStorage = {
  get: (key) => AsyncStorage.getItem(key),
  set: (key, value) => AsyncStorage.setItem(key, value),
};
// storage.web.ts
export const storage: IStorage = {
  get: async (key) => localStorage.getItem(key),
  set: async (key, value) => localStorage.setItem(key, value),
};
// storage.desktop.ts
import { ipcRenderer } from 'electron';
export const storage: IStorage = {
  get: (key) => ipcRenderer.invoke('storage:get', key),
  set: (key, value) => ipcRenderer.invoke('storage:set', key, value),
};