Typescript
keyof typeof typesomething
이런게 되는구나 싶네요. type CalculatorProps = { left: number operator: keyof typeof operations right: number } type operations = { '+': (left: number, right: number) => number '-': (left: number, right: number) => number '*': (left: number, right: number) => number '/': (left: number, right: number) => number } operations 타입의 모든 key를 뽑아 CalculatorProps.operator의 유니온 타입으로 적용합니다.
