Typescript Type Casting

개인적으로 배우고 실수한 내용을 노트한 포스트 입니다

Typescript 에러

object is possibly null

const anchor = document.querySelector('a')

console.log(a.href) //=> object is possibly null

This feature is called “strict null checks”, to turn it off ensure that the –strictNullChecks compiler flag is not set.

or

const anchor = document.querySelector('a')!

console.log(a.href) //=> error's gone

or use type casting

const form = doucment.querySelector('.new-item-form') as HTMLFormElement
//.new-item-form => 클래스 네임