class employee{
  constructor(){
    console.log("constructor Function Employee");
  }
}

class manager extends employee{ 
                                                                         
}

let a = new manager();

Use Consturctor of derived class

class employee{
  constructor(){
    console.log("constructor Function Employee");
  }
}

class manager extends employee{
 constructor(){
   super();
   console.log("constructor Function Manager");
 }
}

let a = new manager();

Advance Example

class employee{
		  constructor(name, age, salary){
		  	this.empname = name;
		  	this.empage = age;
		  	this.empsalary = salary;
		    //console.log("Constructor : Employee");
		  }

		  info(){
		  	document.write(`<h3>Employee Class</h3>
		  								Name : ${this.empname} <br>
		  								Age : : ${this.empage} <br>
		  								Salary : ${this.empsalary} <br>`)
		  }
		}

		class manager extends employee{

			info(){
				let ta = 1000;
				let pa = 300;
				let totalsalary = this.empsalary + ta + pa;
		  	
		  	document.write(`<h3>Manager Class</h3>
		  								Name : ${this.empname} <br>
		  								Age : : ${this.empage} <br>
		  								Salary : ${totalsalary} <br>`)
		  }
		}

		class test extends manager{

		}

		let a = new test("Yahoo Baba", 25, 20000);
		//let b = new employee("Ram Kumar", 22, 12000);

		a.info();
		//b.info();