# TypeScript Support Examples

This document demonstrates the TypeScript support in the IoTDB Node.js client.

## Full Type Safety with Thrift Types

With the TypeScript declaration files, you get complete type safety when working with Thrift-generated types.

### Benefits

- ✅ Full IntelliSense and autocomplete in VS Code/WebStorm
- ✅ Compile-time type checking for all Thrift types
- ✅ Better refactoring support
- ✅ Self-documenting code
- ✅ Zero runtime overhead (`.d.ts` files are compile-time only)

## Example Usage

```typescript
import { Session } from './client/Session';
const ttypes = require('./thrift/generated/client_types');

async function example() {
  const session = new Session({
    host: 'localhost',
    port: 6667,
    username: 'root',
    password: 'root'
  });

  await session.open();

  // TypeScript provides autocomplete and type checking
  const result = await session.executeQueryStatement('SELECT * FROM root.test');
  
  // TypeScript knows result.columns is string[]
  result.columns.forEach(col => console.log(col.toUpperCase()));

  await session.close();
}
```

## Migration from JavaScript

Existing JavaScript code continues to work without changes. The `.d.ts` files provide optional type information for TypeScript users.