Migrate Backend to Strict TypeScript

TYPESCRIPT_PROJECT_REFERENCES.md

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+# TypeScript Project References Configuration
+
+This document describes the TypeScript project references setup for improved compilation performance and better project organization in large codebases.
+
+## Overview
+
+The project has been configured with TypeScript project references to enable:
+- **Incremental compilation**: Only rebuild changed projects
+- **Composite builds**: Better dependency management between modules  
+- **Parallel compilation**: Build independent projects concurrently
+- **Type checking performance**: Faster type checking through project boundaries
+- **Build caching**: Persistent build information for faster subsequent builds
+
+## Project Structure
+
+The TypeScript configuration is organized into the following projects:
+
+```
+├── tsconfig.json              # Root configuration with project references
+├── tsconfig.base.json         # Shared compiler options
+├── tsconfig.core.json         # Core types and utilities
+├── tsconfig.api.json          # API contracts and domain models
+├── tsconfig.rpc.json          # RPC system components
+├── tsconfig.services.json     # Service layer and repositories
+├── tsconfig.validation.json   # Validation and middleware components
+├── tsconfig.integration.json  # Integration and boundary components
+└── tsconfig.grammar.json      # Grammar definition
+```
+
+## Project Dependencies
+
+The projects are organized with clear dependency relationships:
+
+```
+tsconfig.core.json (no dependencies)
+├── tsconfig.api.json
+│   ├── tsconfig.rpc.json
+│   ├── tsconfig.services.json
+│   └── tsconfig.validation.json
+├── tsconfig.integration.json (depends on all above)
+└── tsconfig.grammar.json (no dependencies)
+```
+
+### Core Project (`tsconfig.core.json`)
+**Purpose**: Foundational types and utilities  
+**Dependencies**: None  
+**Contents**:
+- `branded-types.ts` - Type-safe ID and domain string types
+- `rpc-types.ts` - Core RPC type definitions
+- `type-transformers.ts` - Type transformation utilities
+
+### API Project (`tsconfig.api.json`)
+**Purpose**: API contracts and domain models  
+**Dependencies**: Core  
+**Contents**:
+- `api-contracts.ts` - API interface definitions
+- `domain-models.ts` - Internal domain model types
+- `type-transformers.ts` - Data transformation utilities
+
+### RPC Project (`tsconfig.rpc.json`)
+**Purpose**: RPC system implementation  
+**Dependencies**: Core, API  
+**Contents**:
+- `rpc-methods.ts` - RPC method implementations
+- `rpc-router.ts` - Request routing logic
+- `rpc-errors.ts` - Error handling
+- `enhanced-rpc-methods.ts` - Enhanced RPC implementations
+- RPC validation and examples
+
+### Services Project (`tsconfig.services.json`)
+**Purpose**: Service layer and repository patterns  
+**Dependencies**: Core, API  
+**Contents**:
+- `service-interfaces.ts` - Service layer contracts
+- `repository-interfaces.ts` - Repository pattern definitions
+- `dependency-injection.ts` - DI container types
+- `service-factories.ts` - Service factory patterns
+
+### Validation Project (`tsconfig.validation.json`)
+**Purpose**: Validation and middleware components  
+**Dependencies**: Core, API, RPC  
+**Contents**:
+- `api-boundary-validation.ts` - Request/response validation
+- `api-transformation-middleware.ts` - Data transformation middleware
+- `simple-validation.ts`, `zod-validation.ts` - Validation implementations
+- `validation-examples.ts` - Validation usage examples
+
+### Integration Project (`tsconfig.integration.json`)
+**Purpose**: Component integration and boundaries  
+**Dependencies**: Core, API, RPC, Services, Validation  
+**Contents**:
+- `component-boundaries.ts` - Component boundary definitions
+- `index.ts` - Main entry point
+
+### Grammar Project (`tsconfig.grammar.json`)
+**Purpose**: Tree-sitter grammar definition  
+**Dependencies**: None  
+**Contents**:
+- `grammar.ts` - Tree-sitter grammar specification
+
+## Build Scripts
+
+The following npm scripts are available for building:
+
+### Primary Build Commands
+```bash
+# Build all projects with dependencies
+npm run compile
+
+# Build with incremental compilation (faster rebuilds)
+npm run compile:incremental
+
+# Watch mode for development
+npm run compile:watch
+
+# Clean all build artifacts
+npm run compile:clean
+```
+
+### Individual Project Builds
+```bash
+npm run compile:core          # Build only core types
+npm run compile:api           # Build API layer
+npm run compile:rpc           # Build RPC system
+npm run compile:services      # Build service layer
+npm run compile:validation    # Build validation layer
+npm run compile:integration   # Build integration layer
+npm run compile:grammar       # Build grammar definition
+```
+
+### Type Checking and Validation
+```bash
+npm run type-check                     # Dry run with verbose output
+npm run type-check:noEmit              # Type check without emitting files
+npm run validate:project-references    # Validate project references setup
+```
+
+## Build Performance Features
+
+### Incremental Compilation
+Each project has its own `.tsbuildinfo` file for tracking compilation state:
+- `./dist/core/.tsbuildinfo`
+- `./dist/api/.tsbuildinfo`
+- `./dist/rpc/.tsbuildinfo`
+- `./dist/services/.tsbuildinfo`
+- `./dist/validation/.tsbuildinfo`
+- `./dist/integration/.tsbuildinfo`
+- `./dist/grammar/.tsbuildinfo`
+
+### Composite Mode
+All projects are configured with `"composite": true` enabling:
+- Declaration file generation with source maps
+- Dependency tracking between projects
+- Incremental builds based on project boundaries
+
+### Source Maps and Declarations
+Each project generates:
+- **Declaration files** (`.d.ts`) for type information
+- **Declaration maps** (`.d.ts.map`) for IDE navigation
+- **Source maps** (`.js.map`) for debugging
+
+## Development Workflow
+
+### Initial Setup
+```bash
+# Install dependencies
+npm install
+
+# Initial full build
+npm run compile
+```
+
+### Development Mode
+```bash
+# Start watch mode for automatic rebuilds
+npm run compile:watch
+```
+
+### Production Build
+```bash
+# Clean previous builds
+npm run compile:clean
+
+# Full production build
+npm run compile
+
+# Complete build with native components
+npm run build
+```
+
+### Selective Rebuilds
+When working on specific areas:
+```bash
+# Working on core types
+npm run compile:core
+
+# Working on API contracts
+npm run compile:api
+
+# Working on services
+npm run compile:services
+
+# Working on validation
+npm run compile:validation
+```
+
+## Migration Scope Management
+
+The project references help manage migration scope by:
+
+1. **Isolated Changes**: Modify one project without affecting others
+2. **Dependency Validation**: TypeScript validates cross-project dependencies
+3. **Incremental Migration**: Migrate projects individually
+4. **Type Safety**: Maintain type safety across project boundaries
+
+## Performance Benefits
+
+### Compilation Speed
+- **Parallel Builds**: Independent projects build concurrently
+- **Incremental Updates**: Only changed projects rebuild
+- **Dependency Caching**: Unchanged dependencies use cached results
+
+### Development Experience
+- **Faster Type Checking**: Isolated type checking per project
+- **Better IDE Performance**: Projects load independently
+- **Selective Compilation**: Build only what you're working on
+
+## Troubleshooting
+
+### Common Issues
+
+#### Build Errors
+```bash
+# Clean and rebuild if you encounter stale build issues
+npm run compile:clean
+npm run compile
+```
+
+#### Dependency Issues
+```bash
+# Check project dependency order
+npm run type-check
+```
+
+#### Performance Issues
+```bash
+# Use verbose mode to identify bottlenecks
+npm run compile -- --verbose
+```
+
+### Debugging Project References
+```bash
+# Dry run to see what would be built
+npm run type-check
+
+# Build with detailed logging
+npm run compile -- --verbose --listFiles
+```
+
+## Best Practices
+
+### Adding New Files
+1. Add files to the appropriate project's `include` array
+2. Ensure dependencies are correctly configured in `references`
+3. Test with `npm run compile:projectname`
+
+### Modifying Dependencies
+1. Update the `references` array in dependent projects
+2. Rebuild dependent projects after changes
+3. Use `npm run compile:clean` if dependency changes seem cached
+
+### Performance Optimization
+1. Keep projects focused and cohesive
+2. Minimize cross-project dependencies
+3. Use incremental builds during development
+4. Clean builds for production deployments
+
+## Future Enhancements
+
+Potential improvements to consider:
+- **Workspace support** for multi-package repositories
+- **Custom build tools** integration
+- **CI/CD optimization** using project references
+- **Bundle optimization** based on project boundaries