For Mike

test.ts

import { Component } from '@angular/core';

interface Employee {
  name: string;
  salary: number;
}

interface Test {
  a: number;
  b: Employee;
}

type ttt = (a: number, b: number) => number;

type Fun = (a: number, b: Employee) => string;

const f2: ttt = (a, b) => {
  return a + b;
};

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {
  title;

  constructor() {
    this.title = f2(3, 25);
  }

  test: Test = {
    a: 4,
    b: {
      name: 'dani',
      salary: 1000
    }
  };

  f: Fun = (a: number, b2: Employee) => {
    return 'a + b2';
  }
}