Pagebound: auto-reveal spoilers

// ==UserScript==
// @name         Pagebound: auto-reveal spoilers
// @match        https://pagebound.co/*
// @run-at       document-idle
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    const SPOILER_BUTTON_SELECTOR = 'div[aria-hidden="true"].blur-md + button';
    const clickedButtons = new WeakSet();
    let scanScheduled = false;

    function isOnFeedPage() {
        return location.pathname.startsWith('/feed');
    }

    function clickUnclickedSpoilerButtons() {
        scanScheduled = false;
        if (!isOnFeedPage()) return;

        document.querySelectorAll(SPOILER_BUTTON_SELECTOR).forEach((button) => {
            if (clickedButtons.has(button)) return;
            clickedButtons.add(button);
            button.click();
        });
    }

    function scheduleScan() {
        if (scanScheduled) return;
        scanScheduled = true;
        requestAnimationFrame(clickUnclickedSpoilerButtons);
    }

    new MutationObserver(scheduleScan).observe(document.body, {
        childList: true,
        subtree: true,
    });

    scheduleScan();
})();