pointerdown event, gulp-newer, gulp-changed, gulp-cached

1. pointerdown 이벤트 관련 정보

   • https://medium.com/naver-fe-platform/ios-13%EC%9D%98-pointer-%EC%9D%B4%EB%B2%A4%ED%8A%B8-da3be033a9ac
   • https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/pointerdown_event
   • https://www.scienceall.com/%EB%94%94%EC%A7%80%ED%83%80%EC%9D%B4%EC%A0%80digitizer/

1. imagemin - gulp의 since lastRun / gulp-newer / gulp-changed 다 문제있지만. 이 모든 문제점을 해결해준 gulp-cached 모듈 짱짱

   • https://www.npmjs.com/package/gulp-cached