---
category: State
---

# useLastChanged

Records the timestamp of the last change

## Usage

```ts
import { useLastChanged } from '@vueuse/core';
import { nextTick } from 'vue';

const a = ref(0);
const lastChanged = useLastChanged(a);

a.value = 1;

await nextTick();

console.log(lastChanged.value); // 1704709379457
```

By default the change is recorded on the next tick (`watch()` with `flush: 'post'`). If you want to record the change immediately, pass `flush: 'sync'` as the second argument.

```ts
import { useLastChanged } from '@vueuse/core';

const a = ref(0);
const lastChanged = useLastChanged(a, { flush: 'sync' });

a.value = 1;

console.log(lastChanged.value); // 1704709379457
```

## Type Declarations

```ts
export interface UseLastChangedOptions<
  Immediate extends boolean,
  InitialValue extends number | null | undefined = undefined,
> extends WatchOptions<Immediate> {
  initialValue?: InitialValue;
}
export type UseLastChangedReturn =
  | Readonly<ShallowRef<number | null>>
  | Readonly<ShallowRef<number>>;
/**
 * Records the timestamp of the last change
 *
 * @see https://vueuse.org/useLastChanged
 */
export declare function useLastChanged(
  source: WatchSource,
  options?: UseLastChangedOptions<false>,
): Readonly<ShallowRef<number | null>>;
export declare function useLastChanged(
  source: WatchSource,
  options: UseLastChangedOptions<true> | UseLastChangedOptions<boolean, number>,
): Readonly<ShallowRef<number>>;
```
