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When modifying or extending public API interfaces, ensure backward compatibility and proper versioning. Follow these guidelines:

1. Make interface additions optional to avoid breaking changes: ```typescript // Instead of adding required methods interface HttpServer { get(): void; newMethod(): void; // Breaking change! }

// Make additions optional interface HttpServer { get(): void; newMethod?(): void; // Non-breaking change }

2. Support versioning through explicit version types:
```typescript
// Allow flexible version handling
export interface CustomVersioningOptions {
  type: VersioningType.CUSTOM;
  extractor: (request: any) => string | string[];
}

@Controller({
  version: '1',
  versioningOptions: customOptions
})

1. When evolving interfaces:
   • Add new methods as optional properties
   • Use union types for backward compatibility
   • Document breaking changes for major version releases
   • Consider providing migration paths for deprecated features

This approach maintains API stability while enabling controlled evolution of the interface contract.