# Changelog

All notable changes to the CourtListener MCP Server project.

## [Unreleased]

### Major Refactoring (2024-11-01)

Complete codebase refactoring and modernization across 3 phases:

#### Added
- **Type Safety Infrastructure**
  - Zod schema validation for configuration (`src/infrastructure/config-schema.ts`)
  - Error Factory for consistent error handling (`src/common/error-factory.ts`)
  - Type Guards for runtime type checking (`src/common/type-guards.ts`)
  - Branded Types for ID safety (`src/common/branded-types.ts`)
  - BaseMiddleware abstract class (`src/middleware/base-middleware.ts`)
  - ResponseBuilder utility (`src/common/response-builder.ts`)

- **Testing**
  - 100% TypeScript test migration (57 test files)
  - Enhanced test configuration (`tsconfig.test.json`)
  - Comprehensive test coverage

- **Documentation**
  - JSDoc documentation (~90% coverage)
  - Comprehensive improvement reports
  - TypeScript migration guides

#### Changed
- **Architecture**
  - Consolidated 6 server implementations into 1 (`BestPracticeLegalMCPServer`)
  - Single entry point (`src/index.ts`)
  - Simplified package.json (5 CLI commands → 1)

- **Code Quality**
  - Removed 73 duplicate files
  - Removed 2,453 lines of redundant code
  - Added 2,121 lines of quality infrastructure
  - 100% TypeScript migration (no .js in src/ or test/)

- **Dependencies**
  - Clean node_modules installation
  - Updated package-lock.json
  - Security audit: 0 vulnerabilities

#### Removed
- Duplicate infrastructure files (cache, circuit-breaker, logger, metrics)
- Redundant server implementations (5 servers)
- 63 duplicate JavaScript test files
- 10 empty test files
- Legacy .js demo files

#### Fixed
- All ESLint issues
- Type safety improvements (replaced 12+ `any` types)
- Build and test compatibility (100% passing)

### Security
- npm audit: 0 vulnerabilities
- All dependencies up to date
- Clean dependency tree

### Performance
- Faster builds (fewer files to compile)
- Cleaner codebase structure
- Optimized imports

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## Version History

### [0.1.0] - Initial Release
- Core MCP server functionality
- CourtListener API integration
- Basic caching and logging
- 24 legal research tools

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**For detailed information**, see:
- COMPREHENSIVE_IMPROVEMENTS_REPORT.md - Complete refactoring overview
- TYPESCRIPT_MIGRATION_GUIDE.md - Migration details
- ADVANCED_REFACTORING_PLAN.md - Future improvements

