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typescript-advanced

Advanced TypeScript patterns including generics, conditional types, mapped types, template literals, and type guards

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# TypeScript Advanced

## Generics with Constraints

```typescript
interface HasId {
  id: string;
}

function findById<T extends HasId>(items: T[], id: string): T | undefined {
  return items.find(item => item.id === id);
}

function groupBy<T, K extends string | number>(