[ React ] Expected an assignment or function call and instead saw an expression 오류 해결 방법

💥 React 실행 후 발생한 에러 메시지

ERROR
[eslint] src/App.js Line 49:13: Expected an assignment or function call and instead saw an expression no-unused-expressions

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✅ 해결 방법

• '{'를 생략해 줍니다.

setTodoData(prev => {[...prev, newTodo]})

setTodoData(prev => [...prev, newTodo])