Factory class example

factory.example.ts

class AggregationService {
  constructor(private readonly clientFactory: AggregationClientFactory) {}

  public processRequest(request: AggregationRequest): void {
    const client = this.clientFactory.createClient(request.serviceName);

    if (request.type === "getAccounts") {
      const result = client.getAccounts();
      // Save result
    }

    if (request.type === "getBillings") {
      const result = client.getBillings();
      // Save result
    }
  }
}

//
// Factory
//

class AggregationClientFactory {
  nameToClientMap = {
    "GitHub": GitHubClient,
    "Discord": DiscordClient,
  }

  public createClient(name: String): AbstractAggregationClient {
    const clientClass = this.nameToClientMap[name];

    const clientOptions: ClientOptions = {
      logger: this.createLogger(),
      httpService: this.httpService,
    };

    return new clientClass(clientOptions);
  }
}

//
// Clients
//

abstract class AbstractAggregationClient {
  constructor(private readonly options) {}

  public getAccounts(): AggregationResult {}
  public getBillings(): AggregationResult {}
}

class GitHubClient extends AbstractAggregationClient {
  public getAccounts(): AggregationResult {
    // GitHub getAccounts logic
  }
}

class DiscordClient extends AbstractAggregationClient {
  public getAccounts(): AggregationResult {
    // Discord getAccounts logic
  }
}