@sorens/artist-svelte/utilities/hook/isVisible/index.js

an opinionated and clean UI framework for SvelteKit with theme support built-in

import { browser } from '$app/env';
export default (element) => {
    if (!browser) /* istanbul ignore next */
        return false;
    const rect = element.getBoundingClientRect();
    return (rect.top >= 0 &&
        rect.left >= 0 &&
        rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
        rect.right <= (window.innerWidth || document.documentElement.clientWidth));
};