How do I use overloading through inteface?

[thk-powertask]

I am using nestjs, class-transformer, and plan to further customize it using ts-mapstruct.
I am trying to implement overloading with a method called of through an interface. How should I use it?

export interface OrderMapper {
    of(_source: Order): OrderInfo;
    of(_source: OrderItem): OrderItemInfo;
}

@Mapper()
export class OrderMapperImpl implements OrderMapper {
      of(_order: Order): OrderInfo;
      of(_order: OrderItem): OrderItemInfo;
    
      @Mappings()
      of(_source: Order | OrderItem): OrderInfo | OrderItemInfo {
          return ...
      }
}