project-architecture

Development

BuildingAI monorepo project structure and architecture guide. Use when AI needs to understand project organization, locate files, understand package relationships, find where specific functionality is implemented, or navigate the codebase structure. Essential for any development task that requires understanding the project layout, import patterns, module organization, or cross-package dependencies.

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Source SKILL.md: https://github.com/BidingCC/BuildingAI/blob/HEAD/skills/project-architecture/SKILL.md

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BuildingAI Project Architecture

Comprehensive guide to BuildingAI monorepo structure, packages, and development patterns.

When to Use

Use this skill when you need to:

Locate where specific functionality is implemented
Understand package relationships and dependencies
Find the correct import paths and patterns
Navigate module organization and structure
Understand development patterns and conventions
Know what each package provides and how to use it

Instructions

Understanding the Monorepo Structure

The BuildingAI project is a pnpm workspace monorepo with the following structure:

buildingai/
├── packages/
│   ├── @buildingai/              # Shared packages
│   │   ├── ai-sdk/                 # AI SDK (legacy)
│   │   ├── ai-sdk-new/             # AI SDK (Vercel AI SDK 6.x)
│   │   ├── base/                   # BaseController, BaseService
│   │   ├── cache/                  # CacheService, RedisService
│   │   ├── config/                 # Configuration management
│   │   ├── constants/               # Shared constants
│   │   ├── db/                     # TypeORM, entities, migrations
│   │   ├── decorators/             # Custom decorators
│   │   ├── di/                     # Dependency injection utilities
│   │   ├── dict/                   # Dictionary/configuration management
│   │   ├── dto/                    # Shared DTOs
│   │   ├── errors/                 # HttpErrorFactory
│   │   ├── eslint-config/          # ESLint configuration
│   │   ├── extension-sdk/          # Extension development SDK
│   │   ├── logger/                 # Logging utilities
│   │   ├── pipe/                   # Validation pipes
│   │   ├── types/                  # TypeScript type definitions
│   │   ├── typescript-config/      # TypeScript configurations
│   │   ├── upgrade/                # Version upgrade scripts
│   │   ├── utils/                  # Utility functions, HTTP client
│   │   ├── web/                    # Frontend shared packages
│   │   │   ├── hooks/              # React hooks
│   │   │   ├── http/               # HTTP client
│   │   │   ├── services/           # Frontend services
│   │   │   ├── stores/             # State management (Pinia)
│   │   │   ├── types/              # TypeScript types
│   │   │   └── ui/                 # UI components
│   │   ├── di/                     # Dependency injection utilities
│   │   └── wechat-sdk/             # WeChat integration SDK
│   ├── api/                        # Main NestJS API application
│   ├── core/                       # Reusable business logic modules
│   ├── cli/                        # CLI tooling
│   └── client/                     # Desktop client (Tauri + React)
├── skills/                         # AI skills for development guidance
├── extensions/                     # Plugin extensions (runtime loaded)
├── public/                         # Static web assets
└── scripts/                        # Build and utility scripts

Using Reference Files

For detailed information about each package, consult the corresponding reference file in references/:

@buildingai Packages:

references/base.md - BaseController, BaseService
references/cache.md - CacheService, RedisService
references/config.md - Configuration management
references/constants.md - Shared constants
references/db.md - Database layer (TypeORM, entities)
references/decorators.md - Custom decorators
references/dict.md - Dictionary management
references/dto.md - Shared DTOs
references/errors.md - Error handling
references/logger.md - Logging utilities
references/utils.md - Utility functions, HTTP client
references/ai-sdk.md - AI SDK packages
references/web.md - Frontend packages
references/extension-sdk.md - Extension SDK
references/pipe.md - Validation pipes
references/types.md - TypeScript types
references/upgrade.md - Version upgrade scripts
references/di.md - Dependency injection utilities
references/wechat-sdk.md - WeChat integration SDK

Main Packages:

references/api.md - Main NestJS API application
references/core.md - Reusable business logic
references/cli.md - CLI tooling
references/client.md - Desktop client

Load these reference files when you need detailed information about a specific package's exports, usage patterns, or implementation details.

Import Patterns

Backend (API/Core) Import Order:

@buildingai/* packages
@nestjs/* packages
@common/* (API only)
@modules/* (API only)
@core/* (API only)
Third-party packages
Relative paths

Path Aliases (API):

@common/* → src/common/*
@modules/* → src/modules/*
@core/* → src/core/*
@assets/* → src/assets/*

Development Patterns

Service Pattern:

Extend BaseService<Entity> from @buildingai/base for CRUD operations
Use dependency injection with @InjectRepository() for repositories
See references/base.md for available methods and features

Controller Pattern:

Use @ConsoleController(path, groupName) for admin APIs (auto auth + permissions)
Use @WebController(path) for frontend APIs (requires auth by default)
Use @Playground() decorator to get current user
See references/decorators.md and references/api.md for details

**Module Structure: src/modules/{module-name}/ with controllers, services, and DTOs

Quick Navigation

When implementing features, reference the appropriate package:

Authentication: references/decorators.md (@Playground()), references/api.md (guards)
Database: references/db.md (entities), references/base.md (BaseService CRUD)
Error Handling: references/errors.md (HttpErrorFactory)
Caching: references/cache.md (CacheService, RedisService)
File Upload: references/core.md (upload services)
AI Functionality: references/ai-sdk.md, references/api.md (AI modules)
Frontend: references/web.md (services, stores, UI components)

Skills Integration

This skill works with other skills:

postgresql-table-design - For database schema design
frontend-design - For frontend UI development
ai-sdk - For AI functionality implementation

When implementing features, reference the appropriate package reference file to understand what's available and how to use it.

Other versions

Version 2 on GitHub