class Greeter {
  static standardGreeting = 'Hello, there'
  
  greeting: string

  constructor(message?: string) {
    this.greeting = message
  }

  greet() {
    if (this.greeting) {
      return 'Hello, ' + this.greeting
    } else {
      return Greeter.standardGreeting
    }
  }
}

let greeter: Greeter
greeter = new Greeter()
console.log(greeter.greet())

let greeterMaker: typeof Greeter = Greeter
greeterMaker.standardGreeting = 'Hey there'

let greeter2: Greeter = new greeterMaker()
console.log(greeter2.greet())

"Greeter 是实例类型，typeof Greeter 就是类类型"
按对这句话的理解：
greeter的类型是Greeter的实例类型，那它的值只要包含’class Greeter’的实例部分即可？
greeterMaker的类型是Greeter的类类型，那它的值只要包含’class Greeter’静态部分即可？