tryOnUnmounted 
Safe onUnmounted. Call onUnmounted() if it's inside a component lifecycle, if not, do nothing
Usage 
js
import { tryOnUnmounted } from '@vueuse/core'
tryOnUnmounted(() => {
})Type Declarations 
typescript
/**
 * Call onUnmounted() if it's inside a component lifecycle, if not, do nothing
 *
 * @param fn
 * @param target
 */
export declare function tryOnUnmounted(fn: Fn, target?: any): void