feat(blog): as const와 keyof typeof로 enum 없이 안전한 상수 만들기 (#38)#128
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- enum이 남기는 런타임 코드·역방향 매핑과 nominal 특성의 함정을 정리 - as const + (typeof X)[keyof typeof X]로 값·타입 유니온 만드는 패턴 설명 - 모든 코드 예제를 tsc 5.5로 검증(에러/컴파일 출력 실측)
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개요
이슈 #38 을 블로그 포스트로 작성했습니다.
frontend시리즈에 추가됩니다.apps/blog/src/app/(main)/posts/frontend/ts-as-const/page.mdx/posts/frontend/ts-as-const다루는 내용
enum이 타입이 아니라 값이라 컴파일 후 런타임 코드(IIFE + 숫자 enum 역방향 매핑)를 남기는 점enum의 nominal 특성 — 값이 같은 평범한 문자열도 거부const enum의 한계 — ambient const enum은isolatedModules에서 TS2748로 막힘as const+(typeof X)[keyof typeof X]로 값과 리터럴 유니온 타입을 함께 만드는 실전 패턴satisfies로 형태 검증과 리터럴 유지를 동시에검증
tsc 5.5.4로 실측 검증 (에러 메시지·Object.keys이중화·컴파일 출력)pnpm --filter blog run build성공 —/posts/frontend/ts-as-const정적 생성 확인관례 준수
##로 시작, frontmatter는@libs/frontmatter사용postId(ts-as-const)와 폴더명 일치Closes #38