Enable YouTube DVR

// ==UserScript==
// @name        YTBetter
// @namespace   YTBetter
// @match       https://*.youtube.com/*
// @run-at      document-start
// @grant       none
// @version     2.0
// @author      トワ…
// @description Patches YouTube to bypass some limitations
// ==/UserScript==

"use strict";

// Interop with "Simple YouTube Age Restriction Bypass"
const {
  get: getter,
  set: setter,
} = Object.getOwnPropertyDescriptor(Object.prototype, "playerResponse") ?? {
  set(value) {
    this[Symbol.for("YTBetter")] = value;
  },
  get() {
    return this[Symbol.for("YTBetter")];
  },
};

const isObject = (value) => value != null && typeof value === "object";

Object.defineProperty(Object.prototype, "playerResponse", {
  set(value) {
    if (isObject(value)) {
      const { videoDetails } = value;
      if (isObject(videoDetails)) {
        videoDetails.isLiveDvrEnabled = true;
      }
    }
    setter.call(this, value);
  },
  get() {
    return getter.call(this);
  },
  configurable: true,
});