useRefsMap.ts

function useRefsMap<K extends string | number | symbol, V>() {
  const mapRefs = new Map<K, Ref<V | undefined>>()
  return {
    ...mapRefs,
    set(key: K, value: V) {
      if (mapRefs.has(key)) {
        const r = mapRefs.get(key)!
        r.value = value
      } else {
        mapRefs.set(key, ref(value) as Ref<V>)
      }
    },
    get(key: K) {
      if (mapRefs.has(key))
        return mapRefs.get(key)!

      const newRef = ref(undefined)
      mapRefs.set(key, newRef)
      return newRef
    },
  }
}