PropTypes

타입이나 필수값 지정을 위해서 

 

// 출력 타입을 정할 수있는 공간 

// 또는 값에 숫자나 true false같은값 N/A같은값이 출력되지않게 할려면다음과같이 

static propTypes ={ 

title : PropTypes.string, 

poster : PropTypes.string, 

} 

 

이런식으로 지정할 수있다. 

 

과거에는 리액트 패키지에잇었지만 

 

현재는 설치해야하는듯하다.. 

 

 

static propTypes ={ 

title : PropTypes.string.isRequired, 

poster : PropTypes.string, 

} 

 

이런식으로 구성하고  

Title을 지워버리면 다음과같은 메시지가 나ㅗㄴ다. 

 

 

index.js:2178 Warning: Failed prop type: The prop `title` is marked as required in `Movie`, but its value is `undefined`. 

    in Movie (at App.js:31) 

    in App (at index.js:7)