Duplicate Interfaces Example

Project Structure

duplicate-interfaces-example/
├── services/
│   ├── INotificationService.ts
│   ├── EmailNotificationService.ts
│   ├── SmsNotificationService.ts
│   └── PushNotificationService.ts
├── ioc.config.json
└── README.md

Interface

export interface INotificationService {
  sendNotification(message: string, recipient: string): Promise<void>;
  getServiceName(): string;
}

Email Implementation

export class EmailNotificationService implements INotificationService {
  async sendNotification(message: string, recipient: string): Promise<void> {
    console.log(`Sending EMAIL notification to ${recipient}: ${message}`);
    await new Promise(resolve => setTimeout(resolve, 100));
  }

  getServiceName(): string {
    return 'Email Notification Service';
  }
}

SMS Implementation

export class SmsNotificationService implements INotificationService {
  async sendNotification(message: string, recipient: string): Promise<void> {
    console.log(`Sending SMS notification to ${recipient}: ${message}`);
    await new Promise(resolve => setTimeout(resolve, 50));
  }

  getServiceName(): string {
    return 'SMS Notification Service';
  }
}

Push Implementation

export class PushNotificationService implements INotificationService {
  async sendNotification(message: string, recipient: string): Promise<void> {
    console.log(`Sending PUSH notification to ${recipient}: ${message}`);
    await new Promise(resolve => setTimeout(resolve, 25));
  }

  getServiceName(): string {
    return 'Push Notification Service';
  }
}

Configuration

{
  "source": ".",
  "output": "container.gen.ts",
  "interface": "I[A-Z].*",
  "exclude": [
    "**/*.test.ts",
    "**/*.spec.ts"
  ],
  "verbose": true,
  "modules": {
    "DuplicateModule": [
      "services/**"
    ]
  }
}

Expected Error

Error: Interface 'INotificationService' is implemented by multiple classes:
  - EmailNotificationService (/path/to/services/EmailNotificationService.ts)
  - SmsNotificationService (/path/to/services/SmsNotificationService.ts)
  - PushNotificationService (/path/to/services/PushNotificationService.ts)

Multiple classes implement the same interface(s): INotificationService.
Each interface should only be implemented by one class for proper dependency injection.