GitHub PR: Auto-View packages.lock.json

Automatically marks packages.lock.json files as Viewed on GitHub PRs
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// ==UserScript==
// @name         GitHub PR: Auto-View packages.lock.json
// @namespace    https://github.com/annadongg
// @version      1.0.1
// @description  Automatically marks packages.lock.json files as Viewed on GitHub PRs
// @author       Anna Dong
// @match        https://github.com/*/*/pull/*/changes*
// @match        https://github.com/*/*/pull/*/changes
// @run-at       document-idle
// @grant        none
// @license      MIT
// ==/UserScript==

(function () {
    'use strict';

    const FILENAME_MATCHERS = [/packages\.lock\.json/i];
    const DEBOUNCE_MS = 200;
    const BUTTON = 'button[aria-label*="Viewed"]'
    const NOT_VIEWED_BUTTON = 'button[aria-label*="Viewed"][aria-pressed=false]';
    const VIEWED_BUTTON = 'button[aria-label*="Viewed"][aria-pressed=true]';

    const isLockfile = (text) =>
    text && FILENAME_MATCHERS.some((rx) => rx.test(text));

    const debounce = (fn, wait) => {
        let t;
        return (...args) => {
            clearTimeout(t);
            t = setTimeout(() => fn(...args), wait);
        };
    };

    const mode = Object.freeze({
        Viewed: 'VIEWED',
        Unviewed: 'UNVIEWED'
    });

    let currentMode = null;

    // if the user manually clicks the checkbox, ignore when automatically scanning
    document.addEventListener('click', (e) => {
        // ignores script-generated clicks
        if (!e.isTrusted) return;

        const checkbox = e.target.closest(BUTTON);
        if (!checkbox) return;

        const region = checkbox.closest('[role="region"]');
        if (region) {
            region.classList.add('monkey-ignore');
        }
    });


    function toggleLockFiles() {
        if (currentMode == null) return;
        const regions = document.querySelectorAll('[role="region"][aria-labelledby]');

        regions.forEach((region) => {
            if (region.classList.contains('monkey-ignore')) return;

            const headerId = region.getAttribute('aria-labelledby');
            const headerEl = document.getElementById(headerId);
            if (!headerEl) return;

            const filename =
                  headerEl.textContent.trim();

            if (!isLockfile(filename)) return;

            const checkbox =
                  region.querySelector(currentMode === mode.Viewed ? NOT_VIEWED_BUTTON : VIEWED_BUTTON);

            if (checkbox) {
                checkbox.click();
            }
        });
    }

    function injectButtons() {
        const bar = document.querySelector('section[class*="use-sticky-header"]');
        if (!bar || bar.querySelector('.view-all-btn')) return;

        const wrapper = document.createElement('div');
        wrapper.appendChild(viewButton());

        bar.querySelector('[class*="Stack"]').appendChild(wrapper);
    }

    function viewButton() {
        const btn = document.createElement('button');
        btn.textContent = 'Hide lockfiles';
        btn.className = 'btn btn-sm view-all-btn';
        btn.style.marginLeft = '8px';

        btn.addEventListener('click', () => {
            currentMode = currentMode == mode.Viewed || null ? mode.Unviewed : mode.Viewed;
            const regions = document.querySelectorAll('[role="region"][aria-labelledby]');
            regions.forEach((region) => region.classList.remove('monkey-ignore'));
            btn.textContent = currentMode == mode.Viewed ? 'Show lockfiles' : 'Hide lockfiles';

            toggleLockFiles();
        });

        return btn;
    }


    const debouncedFn = debounce(() => {
        toggleLockFiles()
    }, DEBOUNCE_MS);


    // github progressively loads regions
    // thia watches for changes and keeps checking for new regions :)
    new MutationObserver(() => {
        injectButtons();
        debouncedFn();
    }).observe(document.body, { childList: true, subtree: true });


    // initial run
    injectButtons();
    debouncedFn();
})();