Typescript rewriting constructor properties

main.ts

class F {
  constructor(protected a: string) {
    console.log("F.a", a);
    console.log("F.this.a", this.a);
  }

  b() {
    console.log("F.b.this.a", this.a);
  }
}

class F2 extends F {
  constructor(protected a: string) {
    super("start|" + a + "|end");
    console.log("F2.a", a);
    console.log("F2.this.a", this.a);
  }
}

new F("*").b();
console.log("");
new F2("*").b();

/*
Output:
F.a *
F.this.a *
F.b.this.a *

F.a start|*|end
F.this.a start|*|end
F2.a *
F2.this.a *
F.b.this.a *
*/