OneKey Architecture Overview

Platform Structure

• apps/desktop/ - Electron desktop app (Windows, macOS, Linux)
• apps/mobile/ - React Native mobile app (iOS, Android)
• apps/ext/ - Browser extension (Chrome, Firefox, Edge, Brave)
• apps/web/ - Progressive web application
• apps/web-embed/ - Embeddable wallet components

Core Packages

• packages/core/ - Blockchain protocol implementations, cryptography, hardware wallet communication
• packages/kit/ - Application logic, state management, API integrations
• packages/kit-bg/ - Background services and workers
• packages/components/ - Tamagui-based cross-platform UI components
• packages/shared/ - Platform abstractions, utilities, build configurations
• packages/qr-wallet-sdk/ - Air-gapped wallet QR communication

Key Architectural Patterns

• Multi-chain support: 40+ blockchains with pluggable chain implementations
• Cross-platform UI: Tamagui for universal components with platform-specific adaptations
• Platform-specific files: Use .native.ts, .desktop.ts, .web.ts, .ext.ts suffixes
• Hardware wallet integration: Custom @onekeyfe/hd-* SDK packages
• State management: Jotai for atomic state management

Code Organization

File Naming Conventions

• Platform-specific implementations use suffixes: .native.ts, .web.ts, .desktop.ts, .ext.ts
• Component files use PascalCase: ComponentName.tsx
• Hook files use camelCase with use prefix: useHookName.ts
• Utility files use camelCase: utilityName.ts

Import Patterns

• Use workspace references: @onekeyhq/components, @onekeyhq/core, @onekeyhq/kit
• Platform detection via @onekeyhq/shared/src/platformEnv
• Conditional imports based on platform capabilities

Import Hierarchy Rules - STRICTLY ENFORCED

CRITICAL: Violating these rules WILL break the build and cause circular dependencies.

HIERARCHY (NEVER violate this order):

• @onekeyhq/shared - FORBIDDEN to import from any other OneKey packages
• @onekeyhq/components - ONLY allowed to import from shared
• @onekeyhq/kit-bg - ONLY allowed to import from shared and core (NEVER components or kit)
• @onekeyhq/kit - Can import from shared, components, and kit-bg
• Apps (desktop/mobile/ext/web) - Can import from all packages

BEFORE ADDING ANY IMPORT:

1. Verify the import respects the hierarchy above
2. Check if the import creates a circular dependency
3. Run yarn tsc:only to validate no circular dependency introduced
4. If unsure, find an alternative approach that respects the hierarchy

COMMON VIOLATIONS TO AVOID:

• ❌ Importing from @onekeyhq/kit in @onekeyhq/components
• ❌ Importing from @onekeyhq/components in @onekeyhq/kit-bg
• ❌ Importing from @onekeyhq/kit in @onekeyhq/core
• ❌ Any "upward" imports in the hierarchy

Component Structure

• UI components in packages/components/src/
• Business logic in packages/kit/src/
• Chain-specific code in packages/core/src/chains/

Deep Analysis & Architecture Consistency Framework

Pre-Modification Analysis Protocol

MANDATORY ANALYSIS STEPS (Execute BEFORE any code changes):

1. Scope Impact Assessment

   • Identify ALL packages/apps affected by the change
   • Map dependencies that will be impacted (use yarn why <package> if needed)
   • Evaluate cross-platform implications (desktop/mobile/web/extension)
   • Assess backward compatibility requirements

2. Pattern Consistency Verification

   • Examine existing similar implementations in the codebase
   • Identify established patterns and conventions used
   • Verify new code follows identical patterns
   • Check naming conventions align with existing code

3. Architecture Integrity Check

   • Validate against monorepo import hierarchy rules
   • Ensure separation of concerns is maintained
   • Verify platform-specific code uses correct file extensions
   • Check that business logic stays in appropriate packages

4. Performance Impact Evaluation

   • Consider bundle size implications (especially for web/extension)
   • Evaluate runtime performance effects
   • Assess memory usage implications
   • Consider impact on application startup time

Code Pattern Recognition Framework

WHEN ADDING NEW FUNCTIONALITY:

1. Find Similar Examples: Search codebase for similar implementations
2. Extract Patterns: Identify common approaches, naming, structure
3. Follow Conventions: Mirror existing patterns exactly
4. Validate Consistency: Ensure new code looks like existing code

WHEN MODIFYING EXISTING CODE:

1. Understand Context: Read surrounding code and imports
2. Preserve Patterns: Maintain existing architectural decisions
3. Consistent Style: Match existing code style and structure
4. Validate Integration: Ensure changes integrate seamlessly

Architecture Validation Checklist

BEFORE COMMITTING ANY CHANGES:

• Import hierarchy rules respected (no upward imports)
• Platform-specific files use correct extensions
• Security patterns maintained (especially for crypto operations)
• Error handling follows established patterns
• State management patterns consistently applied
• UI component patterns followed (Tamagui usage)
• Translation patterns properly implemented
• Testing patterns maintained and extended