Nexus mods - right／left arrow pagination.user.js

// ==UserScript==
// @name        Nexus Mods - right/left arrow pagination
// @match       https://www.nexusmods.com/*
// @grant       none
// @version     1.0
// @author      Tim 'Piepmatz' Hesse
// @description Add event listeners to the right and left buttons for the pagination to allow to page with the arrow keys
// ==/UserScript==

const ARROW_KEYS = {
  left: 37,
  up: 38,
  right: 39,
  down: 40
}

document.addEventListener("keyup", event => {
  let nextButton = document.querySelector(".pagination .next a");
  let prevButton = document.querySelector(".pagination .prev a");

  let leftKeyUp = event.keyCode === ARROW_KEYS.left;
  let rightKeyUp = event.keyCode === ARROW_KEYS.right;

  if ((leftKeyUp || rightKeyUp) && (nextButton || prevButton)) window.scrollTo({
    top: 0,
    behavior: "smooth"
  });

  if (rightKeyUp) nextButton?.click();
  if (leftKeyUp) prevButton?.click();
});