show_hide_github_comments.user.js

// ==UserScript==
// @name         Show/Hide Inline Review Comments on GitHub
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Adds a button in the upper right of the UI to toggle visibility of GitHub inline comments on pull requests
// @author       Matt C. Wilson, with "help" from OpenAI (ok I edited the UserScript header don't @ me)
// @match        https://github.com/*/pull/*/files
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    // Wait for the page to load completely
    function waitForPageReady(callback) {
        const check = () => {
            const target = document.querySelector('body');
            if (target) callback();
            else setTimeout(check, 500);
        };
        check();
    }

    function addToggleButton() {
        // Avoid adding the button multiple times
        if (document.getElementById('toggle-inline-comments-btn')) return;

        const button = document.createElement('button');
        button.id = 'toggle-inline-comments-btn';
        button.textContent = 'Toggle Comments';
        button.style.position = 'fixed';
        button.style.top = '10px';
        button.style.right = '10px';
        button.style.zIndex = '9999';
        button.style.padding = '6px 12px';
        button.style.backgroundColor = '#2da44e';
        button.style.color = 'white';
        button.style.border = 'none';
        button.style.borderRadius = '6px';
        button.style.cursor = 'pointer';
        button.style.fontSize = '14px';

        let visible = true;

        button.addEventListener('click', () => {
            const commentRows = document.querySelectorAll('tr.inline-comments');
            commentRows.forEach(row => {
                if (visible) {
                    row.style.display = 'none';
                } else {
                    row.style.display = '';
                }
            });
            visible = !visible;
        });

        document.body.appendChild(button);
    }

    waitForPageReady(() => {
        addToggleButton();
        // Optional: re-add if navigating on SPA
        document.addEventListener('pjax:end', addToggleButton);
    });
})();