@jods4 Thanks for taking time reading my proposal :)

Regarding @vue/reactivty: I wasn't able to find any docs regarding this package so I didn't take it into account.. Even if one could build the untrack function, the goal is to not do that and instead have built-in way of doing that.

That being said, I'm not strictly for a function called untrack. Your proposal with ref.peek is also perfectly valid and enables everything the untrack function would also enable if refs are used. A untrack function could also work for reactive objects created by reactive().

ref.peek() does not cover all cases

for example, I want to protect myself in that if the user passed a reactive variable, it will not get into the dependency

function useTimeout(options: { timeout: () => number }) {
    const open = shallowRef(false)
    watchEffect(() => {
        setTimeout(() => (open.value = true), untrack(options.timeout))
    })
}

@teleskop150750 pauseTracking / resetTracking is a global "disable reactivity tracking" switch.

Your untrack example would not work.
timeout() is declared as () => number.
In JS, options.timeout() will be evaluated first (and tracked by Vue), then the resulting number is passed to untrack(), to no effect...

@jods4 Thank you, I fixed it

Then you can use

function untrack(x) {
  try {
    pauseTracking()
    return toValue(x)
  }
  finally {
    resetTracking()
  }
}