Userscript to adjust the "slide" transition time of Dropbox Paper presentations

fix-paper-slides.user.js

// ==UserScript==
// @name         Fix Paper slides
// @namespace    https://hax.so/
// @version      0.1
// @description  Adjusts the "slide" transition time of Dropbox Paper presentations
// @author       Andrew Drake <adrake@adrake.org>
// @match        https://paper.dropbox.com/doc/present/*
// @run-at       document-body
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    const NEW_OPTIONS = {duration: 100}; // Optional: easing: 'ease-in-out'
    function hook() {
        const realAnimate = $.prototype.animate;
        $.prototype.animate = function (properties, durationOrOptions, easing, complete) {
            if ('scrollTop' in properties) {
                if (typeof durationOrOptions === 'number')
                    return realAnimate.call(this, properties, NEW_OPTIONS.duration, NEW_OPTIONS.easing || easing, complete);
                if (typeof durationOrOptions === 'object')
                    return realAnimate.call(this, properties, Object.assign({}, durationOrOptions, NEW_OPTIONS));
            }
            return realAnimate.apply(this, arguments);
        };
    }
    if (window.$)
        hook();
    else
        paperDepTracker.addOnLoadHandler(hook);
})();