// ==UserScript==
// @name        niconico unlimited comment slot
// @namespace   rinsuki.net
// @match       https://www.nicovideo.jp/watch/*
// @version     1.0.1
// @grant       GM_getValue
// @grant       GM_setValue
// @author      rinsuki
// @description ニコニコ動画の最大同時コメント表示数を撤廃します。
// ==/UserScript==
(() => {
function getReactInternalInstance(dom) {
for (const key in dom) {
if (key.startsWith("__reactInternalInstance$")) return dom[key]
}
}
function doIt(commentRenderer) {
const commentRendererInstance = getReactInternalInstance(commentRenderer).return.stateNode.renderer
/** @type {Function} */
const orig = commentRendererInstance.__proto__.registerLayerProcessorEvents
function patch(layer) {
/** @type {{_stagingList: unknown[], reservedList: unknown[], _getReserved: () => unknown, __proto__: {_stagingList: unknown[], reservedList: unknown[], _getReserved: () => unknown, getReserved: () => unknown}}} */
const slotRepository = layer.slotRepository
const slotClass = (slotRepository._stagingList[0] ?? slotRepository.reservedList[0]).constructor
slotRepository.__proto__.getReserved = function() {
while (this.reservedList.length < 5) this.reservedList.push(new slotClass())
return this._getReserved()
}
}
commentRendererInstance.__proto__.registerLayerProcessorEvents = function(lp) {
patch(lp)
orig.call(this, lp)
}
for (const lp of commentRendererInstance.layerProcessorList) {
patch(lp)
}
}
const observer = new unsafeWindow.MutationObserver(mutations => {
for (const mutation of mutations) {
if (mutation.target.classList.contains("CommentRenderer")) {
const commentRenderer = mutation.target
doIt(commentRenderer)
observer.disconnect()
break
}
}
})
observer.observe(document.getElementById("js-app"), {
childList: true,
subtree: true,
})
})()