builder.ts

class Computer {
  constructor(mouse: string, keyboard: string, monitor: string) {}
}

class ComputerBuilder {
  mouse: string;
  keyboard: string;
  monitor: string;

  addMouse(mouse: string) {
    this.mouse = mouse
    return this
  }

  addKeyboard(keyboard: string) {
    this.keyboard = keyboard
    return this
  }

  addMonitor(monitor: string) {
    this.monitor = monitor
    return this
  }

  build() {
    return new Computer(this.mouse, this.keyboard, this.monitor)
  }
}

const computer = new ComputerBuilder()
  .addMouse('Mouse')
  .addKeyboard('keyboard')
  .addMonitor('monitor')
  .build()

console.log(computer)