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index.ts
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index.ts
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import { tryOnScopeDispose } from '@vueuse/shared'
import { watch } from 'vue-demi'
import type { MaybeElementRef } from '../unrefElement'
import { unrefElement } from '../unrefElement'
import { useSupported } from '../useSupported'
import type { ConfigurableWindow } from '../_configurable'
import { defaultWindow } from '../_configurable'
export interface UseMutationObserverOptions extends MutationObserverInit, ConfigurableWindow {}
/**
* Watch for changes being made to the DOM tree.
*
* @see https://vueuse.org/useMutationObserver
* @see https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver MutationObserver MDN
* @param target
* @param callback
* @param options
*/
export function useMutationObserver(
target: MaybeElementRef,
callback: MutationCallback,
options: UseMutationObserverOptions = {},
) {
const { window = defaultWindow, ...mutationOptions } = options
let observer: MutationObserver | undefined
const isSupported = useSupported(() => window && 'MutationObserver' in window)
const cleanup = () => {
if (observer) {
observer.disconnect()
observer = undefined
}
}
const stopWatch = watch(
() => unrefElement(target),
(el) => {
cleanup()
if (isSupported.value && window && el) {
observer = new MutationObserver(callback)
observer!.observe(el, mutationOptions)
}
},
{ immediate: true },
)
const stop = () => {
cleanup()
stopWatch()
}
tryOnScopeDispose(stop)
return {
isSupported,
stop,
}
}
export type UseMutationObserverReturn = ReturnType<typeof useMutationObserver>