useSubscription 
RxJSのSubscriptionを、購読解除やメモリリークの心配なしに使用します。@vueuse/rxjsアドオンで利用可能です。
使用方法 
ts
import { useSubscription } from '@vueuse/rxjs'
import { interval } from 'rxjs'
const count = ref(0)
// useSubscription call unsubscribe method before unmount the component
useSubscription(
  interval(1000)
    .subscribe(() => {
      count.value++
      console.log(count)
    }),
)型宣言 
typescript
export declare function useSubscription(subscription: Unsubscribable): void