useWatch's result is optimised for render phase instead of useEffect's deps, to detect value updates you may want to use an external custom hook for value comparison.

[Sa-So]

What does the first line mean? render phase?
it isn't optimized but can we not use it like this at all:

const watchedVal = useWatch({name: 'someName'})
useEffect(()=> {
console.log(watchedVal)
},[watchedVal])

I have tested this and this works fine almost everytime, even when the watchedValue is an object ;like {id: 1, name: ''} =>{id:2}

but will it work everytime or there will be issues?
If this won't work can someone share a custom hook for this as written in the documentation for value comparison / detect updates and do something when a value changes..