class BankAccount {
  public owner: string;
  private balance: number;
  protected accountType: string;

  constructor(owner: string, balance: number) {
    this.owner = owner;
    this.balance = balance;
    this.accountType = "standard";
  }

  public deposit(amount: number): void {
    this.balance += amount;
  }

  public getBalance(): number {
    return this.balance;
  }
}

const acc = new BankAccount("Ravi", 100);
acc.deposit(50);
console.log(acc.getBalance());
// acc.balance; // Error: 'balance' is private