Use o estado no nome da classe

Standard fair:

const [toggleClass, setToggleClass] = useState(false)

return <div className={toggleClass ? 'some-class' : ''} /> 
Using template literals:

const [toggleClass, setToggleClass] = useState(false)

return <div className={`some-class ${toggleClass ? 'some-class' :''}`} /> 
syeddeveloper