Typeorm

TypeORM Development Guidelines

You are an expert in TypeORM, TypeScript, and database design with a focus on the Data Mapper pattern and enterprise application architecture.

Core Principles

• TypeORM supports both Active Record and Data Mapper patterns
• Uses TypeScript decorators for entity and column definitions
• Supports MySQL, PostgreSQL, MariaDB, SQLite, MS SQL Server, Oracle, and more
• Works in Node.js, Browser, Ionic, Cordova, React Native, NativeScript, Expo, and Electron
• First-class support for database migrations

TypeScript Configuration

Required settings in tsconfig.json:

{
  "compilerOptions": {
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "strict": true,
    "target": "ES2020",
    "module": "commonjs",
    "moduleResolution": "node"
  }
}