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📁 Project Structure

migrilla/
├── 📦 Core Files
│   ├── package.json              # Package configuration and dependencies
│   ├── lib/
│   │   ├── index.js              # Main Migrilla class with migration logic
│   │   └── cli.js                # CLI interface for command handling
│   └── bin/migrilla.js           # Executable entry point
│
├── 📚 Documentation
│   ├── README.md                 # Main documentation and usage guide
│   ├── README_RU.md              # Russian version of main documentation
│   ├── QUICKSTART.md             # Quick start guide for immediate usage
│   ├── FEATURES.md               # Comprehensive features overview
│   ├── API_REFERENCE.md          # Complete API method documentation
│   ├── TRANSACTION_GUIDE.md      # Detailed transaction API documentation
│   ├── PROJECT_STRUCTURE.md      # This file
│   ├── CHANGELOG.md              # Project history and version changes
│   ├── MIGRATION_GUIDE.md        # Version migration guide
│   └── SUMMARY.md                # Complete project overview and achievements
│
├── 🧪 Testing
│   └── test/test.js              # Basic functionality tests
│
├── 🗃️ Migration Files (example)
│   ├── migrations/
│   │   ├── 001_add_users_table_up.sql
│   │   ├── 001_add_users_table_down.sql
│   │   ├── 002_add_orders_table_up.sql
│   │   ├── 002_add_orders_table_down.sql
│   │   ├── 003_add_user_profile_fields_up.sql
│   │   └── 003_add_user_profile_fields_down.sql
│
└── 🔧 Configuration
    └── .gitignore                # Git ignore patterns

📦 Core Files

package.json

  • Package configuration with dependencies
  • CLI binary configuration
  • NPM scripts for testing and examples

lib/index.js

  • Main createMigrilla factory function
  • Database connection management using pg Pool
  • Migration discovery and execution logic
  • Transaction API with callback-style
  • State management in migrilla_state table
  • Functional design with closures

lib/cli.js

  • createMigrillaCLI factory function
  • Environment variable handling
  • Command routing (up, down, status, help)
  • Error handling and user feedback

bin/migrilla.js

  • Executable entry point
  • Shebang for direct execution
  • Argument parsing and CLI delegation

📚 Documentation

README.md

  • Installation and usage instructions
  • Environment variable configuration
  • Example migration files
  • Programmatic API usage
  • Transaction safety information

README_RU.md

  • Russian version of main documentation
  • Translated usage instructions
  • Localized examples
  • Same content as README.md but in Russian

QUICKSTART.md

  • Quick start guide for immediate usage
  • Step-by-step installation instructions
  • First migration examples
  • Common commands and troubleshooting
  • Get started in under 5 minutes

FEATURES.md

  • Comprehensive features overview
  • Key capabilities and benefits
  • Technical features breakdown
  • User experience examples
  • Design principles

API_REFERENCE.md

  • Complete API method documentation
  • Constructor parameters
  • All public and internal methods
  • Error handling patterns
  • Best practices

TRANSACTION_GUIDE.md

  • Detailed comparison of transaction approaches
  • Performance analysis
  • Best practices
  • Internal implementation details

PROJECT_STRUCTURE.md

  • This file - overview of project organization
  • File descriptions and purposes

CHANGELOG.md

  • Project history and version changes
  • Release notes and feature additions
  • Breaking changes and migration guides
  • Future roadmap and planned features

MIGRATION_GUIDE.md

  • Version migration instructions
  • Breaking changes between versions
  • Environment variable updates
  • Step-by-step upgrade guide
  • Rollback procedures

SUMMARY.md

  • Complete project overview and achievements
  • Technical implementation details
  • Statistics and metrics
  • Requirements fulfillment analysis
  • Final results and conclusions

🧪 Testing

test/test.js

  • Basic functionality verification
  • Database connection testing
  • Migration file discovery
  • Simple API testing

🗃️ Migration Files

Example migration files following the naming convention:

  • NNN_description_up.sql - Apply migration
  • NNN_description_down.sql - Rollback migration

Where NNN is a zero-padded number (001, 002, etc.)

🔧 Configuration

.gitignore

  • Standard Node.js ignore patterns
  • Environment files
  • IDE and OS specific files

🚀 Key Features

  1. Atomic Migrations - Each migration runs in a transaction
  2. Transaction Safety - Low-level callback-style API for reliable execution
  3. State Tracking - Persistent migration state in database
  4. Error Handling - Comprehensive error reporting
  5. Environment Support - Multiple database connection methods
  6. CLI & Programmatic - Use via command line or in code
  7. PostgreSQL Only - Focused on PostgreSQL with pg module

🛠️ Dependencies

  • pg - PostgreSQL client for Node.js
  • Node.js 18+ - Modern JavaScript features
  • PostgreSQL - Database server

📝 NPM Scripts

  • npm test - Run basic functionality tests