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$nextTick is a magic property that allows you to only execute a given expression AFTER Alpine has made its reactive DOM updates. This is useful for times you want to interact with the DOM state AFTER it's reflected any data updates you've made.

<div x-data="{ title: 'Hello' }">
            title = 'Hello World!';
            $nextTick(() => { console.log($el.innerText) });

In the above example, rather than logging "Hello" to the console, "Hello World!" will be logged because $nextTick was used to wait until Alpine was finished updating the DOM.