SOLID Principles in JavaScript

Which SOLID principle is being violated in this authentication implementation?

class Authentication {
  constructor() {
    this.database = new MySQLDatabase();
    this.logger = new FileLogger();
    this.emailService = new SMTPEmailService();
  }

  login(username, password) {
    // Authentication logic using this.database
    this.logger.log('Login attempt');
    this.emailService.send('Login notification');
  }
}

Interface Segregation Principle
Open/Closed Principle
Dependency Inversion Principle
This code violates the Dependency Inversion Principle (DIP). The Authentication class directly creates concrete implementations of its dependencies (MySQLDatabase, FileLogger, SMTPEmailService) instead of depending on abstractions. A better approach would be to inject these dependencies through the constructor, allowing for different implementations to be used without modifying the Authentication class.
Liskov Substitution Principle

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