Previous
A utility that tracks and provides access to the previous value of a reactive getter.
The Previous utility creates a reactive wrapper that maintains the previous value of a getter
function. This is particularly useful when you need to compare state changes or implement transition
effects.
Demo
Previous: undefined
Usage
<script lang="ts">
import { Previous } from "runed";
let count = $state(0);
const previous = new Previous(() => count);
</script>
<div>
<button onclick={() => count++}>Count: {count}</button>
<pre>Previous: {`${previous.current}`}</pre>
</div>
Type Definition
class Previous<T> {
constructor(getter: () => T);
readonly current: T; // Previous value
}