computations created outside a createroot or render will never be disposed

[ghost]

I had this problem today and want to share
One more thing to check when getting this warning

If you have custom hooks like this

export function useStripClub(...args: any[]) {
  onMount(() => {
    window.addEventListener(..., ...)
    return () => window.removeEventListener(..., ...)
  })
}

Using onMount() or similar lifecycle functions in a custom hooks might also cause this warning