Can somebody explain following java script code

Question

I was recently going through the typescript documentations

reference: http://www.typescriptlang.org/docs/handbook/typescript-in-5-minutes.html

in this documentation, there is similar typescript code related to section classes as follows

class Student {
  fullName: string;
  constructor(public firstName: string) {
    this.fullName = firstName;
  }
}
interface Person {
  firstName: string;
}
function greeter(person : Person) {
  return "Hello, " + person.firstName;
}
let user = new Student("Jane");
document.body.innerHTML = greeter(user);

I compiled this code with tsc filename.ts It's giving me a javascript compiled code as

var Student = /** @class */ (function () {
    function Student(firstName) {
        this.firstName = firstName;
        this.fullName = firstName;
    }
    return Student;
}());
function greeter(person) {
    return "Hello, " + person.firstName;
}
var user = new Student("Jane");
document.body.innerHTML = greeter(user);

In this generated javascript code I want to know this part:

var Student = /** @class */ (function () {
    function Student(firstName) {
        this.firstName = firstName;
        this.fullName = firstName;
    }
    return Student;
}());

I want someone to help me with good references for Javascript basics for this.