Typescript -基于其他属性的条件属性

type Car = {
  brand: string;
  model: string;
  year: number;
  isElectric: boolean;
};

type ElectricCar = Car & {
  batteryCapacity: number;
};

type GasCar = Car & {
  fuelCapacity: number;
};

type GetCarType<T> = T extends { isElectric: true } ? ElectricCar : GasCar;

function getCar<T extends Car>(car: T): GetCarType<T> {
  if (car.isElectric) {
    return {
      ...car,
      batteryCapacity: 100,
    } as GetCarType<T>;
  } else {
    return {
      ...car,
      fuelCapacity: 50,
    } as GetCarType<T>;
  }
}

const myCar = getCar({
  brand: "Tesla",
  model: "Model 3",
  year: 2022,
  isElectric: true,
});

console.log(myCar);