Type 'void' is not assignable to type 'ReactNode'.

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Type 'void' is not assignable to type 'ReactNode'.

The expected type comes from property 'children' which is declared here on type 'DetailedHTMLProps<HTMLAttributes, HTMLDivElement>'

React Hook useEffect has a missing dependency: 'alarmingTime'. Either include it or remove the dependency array.

children ? 에다가 void 타입을 하나 더 지정해줬다.