How to keep ES6 syntax when transpiling with Typescript

I hope I am not missing a point here. But how can I keep ES6 syntax when transpiling to JS. For instance, if I code:

class Person {
  public name: string;
  constructor(name: string) {
    this.name = name;
  }
}
let person = new Person('John Doe');
console.log(person.name);

TS gives me: ("target": "es6" in tsconfig.json)

var Person = /** @class */ (function () {
    function Person(name) {
        this.name = name;
    }
    return Person;
}());
var person = new Person('John Doe');
console.log(person.name);

But I want TS to give me:

class Person {
  constructor(name) {
    this.name = name;
  } 
}
let person = new Person('John Doe');
console.log(person.name);

My tsconfig.json is like this:

{
  "compilerOptions": {
    "target": "es6",
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictPropertyInitialization": true,
    "noImplicitThis": true,
    "noImplicitReturns": true,
    "alwaysStrict": true
  }
}

P.S.: If I run the command:

tsc -t es6 app.ts

It works;