good_interface_segregation_principle.ts

interface ConventionalEmployee {
  getName(): string;
  getSalary(): number;
}

interface CommissionableEmployee extends ConventionalEmployee {
  getCommission(): number;
}

class SecurityEmployee implements ConventionalEmployee {
  private name: string;
  private salary: number;

  constructor(name: string, salary: number) {
    this.name = name;
    this.salary = salary;
  }

  public getName(): string {
    return this.name;
  }

  public getSalary() {
    return this.salary;
  }
}

class WaiterEmployee implements CommissionableEmployee {
  private name: string;
  private salary: number;
  private salesAmount: number;

  constructor(name: string, salary: number, salesAmount: number) {
    this.name = name;
    this.salary = salary;
    this.salesAmount = salesAmount;
  }

  public getName(): string {
    return this.name;
  }

  public getSalary(): number {
    return this.salary + this.getCommission();
  }

  public getCommission(): number {
    return this.salesAmount * 0.2;
  }
}