event.target.checked doesn't return True or False when using NextUi checkbox component

I'm using a NextUi Checkbox component and I'm trying to create a handleFonction in order to get boolean of the event (true of false). So I use event.target.checked but it returns undefined. Event if I use event.checked it dosen't work (still undefined)

here my function to handle checkbox :

`const handleChange = (event, option) => { const checked = event.target.value

if (checked) {
  changePrice(option.price)
} else {
  changePrice(-option.price)
}

}`

and here my component form Nextui

<Checkbox
                color='warning'
                id={option.text}
                name={option.text}
                size='md'
                className={styles.checkbox}
                label={option.text}
                isRounded={true}
                onChange={(event) => handleChange(event, option)}
              />

Thanks a lot for your reply