It takes PlayerJS without Chromecast (pro module), removes the external Dean Edwards Packer layer if necessary inserts the ChromeCast module and adds a button with linkurl:"chromecast" to the skin/template.

add_playerjs_chromecast.cjs

#!/usr/bin/env node
'use strict';

/**
 * add_playerjs_chromecast.cjs
 *
 * Uses PlayerJS without Chromecast, removes the external Dean Edwards Packer layer if necessary,
 * inserts the ChromeCast module and adds a button with linkurl:"chromecast" to the skin/template.
 *
 * Usage:
 * node add_playerjs_chromecast.cjs ./playerjs.js ./playerjs.with_chromecast.unpacked.js
 *
 * The output is an unpacked JS file that can be included in the same way as the original.
 * For example, new Playerjs({ id: "player", file: "https://example.com/video.mp4", chromecast: { on: 1, receiver: 0, sub: 1, message: 1 }});
 */

const fs = require('fs');
const path = require('path');
const vm = require('vm');

const CHROMECAST_MODULE = 'var ChromeCast=function(){var player;var controller;var deviceName;var words;var current_color;var urls;if(window[\'__onGCastApiAvailable\']){var j=0;for(var i=0;i<window.pljssglobal.length;i++){if(window.pljssglobal[i]){j++}}j==1?CastInit():\'\'}else{window[\'__onGCastApiAvailable\']=function(x,y){if(x){for(var i=0;i<window.pljssglobal.length;i++){if(window.pljssglobal[i]){if(window.pljssglobal[i].api("id")==options.id){window.pljssglobal[i].api(\'castinit\')}}}}else{_log("error: "+y)}}}this.init=function(){CastInit()};function CastInit(){_log("available");if(exist(chrome)){if(exist(chrome.cast)&&exist(cast)&&!o.cast_available){var rid=\'CC1AD845\';if(v.chromecast.receiver==1&&v.chromecast.receiverid){rid=v.chromecast.receiverid}try{cast.framework.CastContext.getInstance().setOptions({receiverApplicationId:rid,autoJoinPolicy:\'tab_and_origin_scoped\',language:\'en-US\',resumeSavedSession:false,androidReceiverCompatible:true});player=new cast.framework.RemotePlayer()}catch(e){log(e)}Controller();o.cast_available=true;setTimeout(Available,1000)}}}function Available(){if(o.controls){o.controls.Review();o.controls.resize()}}function Connection(data){if(cast&&cast.framework){_log((!player.isConnected?\'dis\':\'\')+"connected "+v.id);if(player.isConnected){PlayRemote()}else{PlayLocal()}}}function PlayRemote(x,y){var session=cast.framework.CastContext.getInstance().getCurrentSession();var mime=\'video/mp4\';o.file_type=="hls"?mime="application/x-mpegurl":\'\';o.file_type=="dash"?mime="application/dash+xml":\'\';var url;if(y){url=y}else{url=o.media.currentFile();if(exist(v.casturl)){url=v.casturl}if(exist(o.casturl)){url=o.casturl}url=fjs(url);if(url.indexOf("#"+v.enc2)==0){url=o[o.fd[0]](url)}if(url){if(url.indexOf("#"+v.enc3)==0&&url.indexOf(v.file3_separator)>0){url=o[o.fd[1]](url)}}url=fjs(url);urls=[];if(url.indexOf(":or:")>0){iurl=0;urls=url.split(":or:");url=urls[0]}}var info=new chrome.cast.media.MediaInfo(url,mime);info.metadata=new chrome.cast.media.GenericMediaMetadata();info.metadata.metadataType=chrome.cast.media.MetadataType.GENERIC;var tracks=[];if(exist(o.subs)&&exist(o.current_subtitle)&&v.chromecast.sub==1){info.textTrackStyle=SubStyle();for(var i in o.subs){if(o.subs[i].indexOf(\'vtt\')>0){var t=new chrome.cast.media.Track(0,chrome.cast.media.TrackType.TEXT);t.trackContentId=o.subs[i];t.trackContentType=\'text/vtt\';t.subtype=\'CAPTIONS\';t.name=o.files_subtitle[i];t.trackId=parseInt(i);t.customData=null;tracks.push(t)}}if(tracks.length>0){info.tracks=tracks}}if(v.poster){info.metadata.images=[new chrome.cast.Image(v.poster)]}info.metadata.title=o.titlestore?o.titlestore:(v.title?v.title:\'\');if(v.castname){info.metadata.title=v.castname}var request=new chrome.cast.media.LoadRequest(info);request.currentTime=o.seekto>0?o.seekto:(o.casting?0:o.media.time());request.autoplay=o.play||x==true;if(tracks.length>0&&o.current_subtitle>-1){if(o.current_subtitle<tracks.length){request.activeTrackIds=[parseInt(o.current_subtitle)];_log(\'subtitle \'+o.current_subtitle)}}if(session){session.loadMedia(request).then(function(){deviceName=session.getCastDevice().friendlyName;_log("connected to "+deviceName);if(v.chromecast.message!=0&&!o.casting){words?o.frame.removeChild(words):\'\';words=createElement("div");css(words,{"position":"absolute","top":"20px","width":"100%","left":0,"opacity":0.7,"color":"#fff","pointer-events":"none"});words.innerHTML=\'<center>\'+Lang("castdevice")+\' &laquo;\'+deviceName+\'&raquo;</center>\';o.frame.appendChild(words)}player.volumeLevel=v.volume;controller.setVolumeLevel();if(o.muted&&!player.isMuted){controller.muteOrUnmute()}js("casted");if(x!=true){if(!o.play){!player.isPaused?controller.playOrPause():\'\'}else{o.media.Pause()}}hide(o.mediacontainer);o.casting=true},function(e){_log(e);ErrLocal()})}else{_log("no session");ErrLocal()}}function ErrLocal(){var x;if(urls.length>1){if(iurl<urls.length-1){iurl++;x=true;o.media.Pause();PlayRemote(true,urls[iurl]);setTimeout(function(){o.controls.Play()},300)}}if(!x){PlayLocal();o.alert.txt(Lang("casterror"))}}function PlayLocal(){words?o.frame.removeChild(words):\'\';words=undefined;o.casting=false;show(o.mediacontainer);js("uncasted");if(player){if(player.savedPlayerState){o.actions.Seek(player.savedPlayerState.currentTime);if(player.savedPlayerState.isPaused){o.media.Pause()}else{o.media.Play()}}}}function PlayChanged(){if(player.isPaused){_log("pause");js("castpause");o.controls.Pause()}else{_log("play");js("castplay");o.controls.Play()}}function VolumeChanged(){o.actions.Volume(player.volumeLevel)}function MuteChanged(){player.isMuted?o.actions.Mute():o.actions.Unmute()}function StateChanged(){if(player.isConnected){if(player.playerState==null){if(player.currentTime==player.duration){o.controls.Pause();o.media.onEnded()}}}}function Controller(){_log("control "+v.id);controller=new cast.framework.RemotePlayerController(player);controller.addEventListener(cast.framework.RemotePlayerEventType.IS_CONNECTED_CHANGED,Connection);controller.addEventListener(cast.framework.RemotePlayerEventType.IS_PAUSED_CHANGED,PlayChanged);controller.addEventListener(cast.framework.RemotePlayerEventType.VOLUME_LEVEL_CHANGED,VolumeChanged);controller.addEventListener(cast.framework.RemotePlayerEventType.IS_MUTED_CHANGED,MuteChanged);controller.addEventListener(cast.framework.RemotePlayerEventType.PLAYER_STATE_CHANGED,StateChanged)}Script(\'gstatic.com/cv\',\'https://www.gstatic.com/cv/js/sender/v1/cast_sender.js?loadCastFramework=1\');function _log(x){if(v.chromecast&&v.log==1){log("chromecast",x)}}this.button=function(x){current_color=x;return"<button is=\'google-cast-button\' id=\'pjs_cast_button_"+v.id+"\' style=\'padding:0;width:20px;height:20px;--connected-color:"+x+";--disconnected-color:"+x+";border:0;background:transparent;pointer-events:auto;cursor:pointer\'></button>"};this.Color=function(x,y){if(current_color!=y){var el=document.getElementById("pjs_cast_button_"+v.id);if(el){var style=el.getAttribute("style");var clr=new RegExp(current_color,"gi");style=style.replace(clr,y);el.setAttribute("style",style)}current_color=y}};this.Volume=function(x){if(player.isConnected){player.volumeLevel=x;controller.setVolumeLevel()}};this.Mute=function(){if(player.isConnected){if(!player.isMuted){controller.muteOrUnmute()}}};this.Unmute=function(){if(player.isConnected){if(player.isMuted){controller.muteOrUnmute()}}};this.Play=function(x){if(player.isConnected){if(player.isPaused){controller.playOrPause()}else{if(player.playerState==null){}}}};this.Pause=function(x){if(player.isConnected&&!player.isPaused){controller.playOrPause()}};this.Sub=function(){if(v.chromecast.sub==1){UpdateSub()}};function fjs(x){if(x.indexOf(\'js:\')==0){try{x=eval(x.substr(3))}catch(e){console.log(e.message)}}return x?x:\'\'}function UpdateSub(){if(player.isConnected){var ss=SubStyle();var request=new chrome.cast.media.EditTracksInfoRequest([parseInt(o.current_subtitle)],ss);cast.framework.CastContext.getInstance().getCurrentSession().getSessionObj().media[0].editTracksInfo(request,function(){_log(\'subtitle \'+o.current_subtitle)},function(e){_log(\'subtitle error\'+e)})}}function SubStyle(){var x=new chrome.cast.media.TextTrackStyle();var bga=Math.round(v.sub_bga*255).toString(16);x.backgroundColor=CheckColor(v.sub_bgcolor)+(bga.length==1?bga+\'0\':bga);x.edgeColor=\'#00000016\';x.edgeType=\'DROP_SHADOW\';x.fontFamily=\'CASUAL\';x.fontScale=parseFloat(parseInt(v.sub_sizeproc)/100);x.foregroundColor=CheckColor(v.sub_color)+Math.round(255).toString(16);return x};this.Time=function(x){var x;if(player.isConnected){x=player.currentTime}return x};this.Duration=function(x){var x;if(player.isConnected){x=player.duration}return x};this.Exit=function(){Exit()};function Exit(){if(cast&&cast.framework){PlayLocal()}};this.Go=function(){if(cast&&cast.framework){if(player.isConnected){PlayRemote(o.play)}}};this.Seek=function(x){if(player.isConnected){player.currentTime=x;controller.seek()}};this.remove=function(){Remove()};function Remove(){Exit();if(controller){controller.removeEventListener(cast.framework.RemotePlayerEventType.IS_CONNECTED_CHANGED,Connection);controller.removeEventListener(cast.framework.RemotePlayerEventType.IS_PAUSED_CHANGED,PlayChanged);controller.removeEventListener(cast.framework.RemotePlayerEventType.VOLUME_LEVEL_CHANGED,VolumeChanged);controller.removeEventListener(cast.framework.RemotePlayerEventType.IS_MUTED_CHANGED,MuteChanged);controller.removeEventListener(cast.framework.RemotePlayerEventType.PLAYER_STATE_CHANGED,StateChanged);cast.framework.CastContext.getInstance().endCurrentSession();controller=null}}};';

const CHROMECAST_BUTTON_SNIPPET = `
/* === PlayerJS Chromecast skin button injected === */
if(v.chromecast&&v.chromecast.on==1&&!v.control_chromecast){v.control_chromecast={order:13,on:1,icon:"<svg width='20' height='20' viewBox='0 0 24 24'><g fill='none' fill-rule='evenodd'><path d='M3 18v3h3c0-1.657-1.343-3-3-3zm0-4v2c2.761 0 5 2.239 5 5h2c0-3.866-3.134-7-7-7zm0-4v2c4.971 0 9 4.029 9 9h2c0-6.075-4.925-11-11-11zm0-7h18v14h-5.05c-.236-.695-.548-1.355-.928-1.97H19V5H5v3.078A13.91 13.91 0 0 0 3 8V3z' fill='#ffffff'/></g></svg>",type:"svg",position:"controls",margin:"0 0 0 15",link:1,linkurl:"chromecast",copy:1,iconscolor:"ffffff",click:1,tip:0,hide:0,scale:"1",scaleover:"-1"}}
/* === /PlayerJS Chromecast skin button injected === */
`;

function usageAndExit() {
  console.error(`Usage:\n  node ${path.basename(process.argv[1])} <input-playerjs.js> <output-playerjs.with_chromecast.unpacked.js>`);
  process.exit(1);
}

function readText(filePath) {
  if (!filePath || !fs.existsSync(filePath)) {
    throw new Error(`Файл не найден: ${filePath}`);
  }
  return fs.readFileSync(filePath, 'utf8');
}

function looksPacked(code) {
  return /eval\s*\(\s*function\s*\(\s*p\s*,\s*a\s*,\s*c\s*,\s*k\s*,\s*e\s*,\s*d\s*\)/.test(code);
}

function unpackDeanEdwardsPacker(code) {
  if (!looksPacked(code)) return code;

  let unpacked = '';
  const context = {
    eval(innerCode) {
      unpacked = String(innerCode);
      return undefined;
    },
    console,
    window: {},
    document: {},
    navigator: {},
    location: {},
    Image: function Image() {},
    setTimeout() {},
    clearTimeout() {},
    setInterval() {},
    clearInterval() {},
  };

  vm.createContext(context);
  vm.runInContext(code, context, { timeout: 15000 });

  if (!unpacked || !unpacked.includes('function Playerjs(options)')) {
    throw new Error('Не удалось распаковать PlayerJS: внешний eval/packer слой не вернул код Playerjs.');
  }

  return unpacked;
}

function assertPlayerJs(code) {
  if (!code.includes('function Playerjs(options)')) {
    throw new Error('Это не похоже на распакованный PlayerJS: не найдено function Playerjs(options).');
  }
}

function findChromecastHook(code) {
  const exact = "if(v.chromecast){v.chromecast.on==1?o.chromecast=new ChromeCast():''}";
  const exactPos = code.indexOf(exact);
  if (exactPos !== -1) return { index: exactPos, text: exact };

  const regex = /if\s*\(\s*v\.chromecast\s*\)\s*\{\s*v\.chromecast\.on\s*==\s*1\s*\?\s*o\.chromecast\s*=\s*new\s+ChromeCast\s*\(\s*\)\s*:\s*''\s*\}/;
  const match = code.match(regex);
  if (match && typeof match.index === 'number') return { index: match.index, text: match[0] };

  throw new Error("Не найден hook Chromecast: if(v.chromecast){v.chromecast.on==1?o.chromecast=new ChromeCast():''}");
}

function injectChromeCastModule(code) {
  if (code.includes('var ChromeCast=function()') || code.includes('var ChromeCast = function()')) {
    return { code, changed: false };
  }

  const hook = findChromecastHook(code);
  const injected =
    code.slice(0, hook.index) +
    '\n\n/* === PlayerJS ChromeCast module injected === */\n' +
    CHROMECAST_MODULE.trim() +
    '\n/* === /PlayerJS ChromeCast module injected === */\n\n' +
    code.slice(hook.index);

  return { code: injected, changed: true };
}

function injectChromeCastButton(code) {
  if (code.includes('linkurl:"chromecast"') || code.includes('linkurl: "chromecast"') || code.includes("linkurl:'chromecast'")) {
    return { code, changed: false };
  }

  const hook = findChromecastHook(code);
  const injected = code.slice(0, hook.index) + CHROMECAST_BUTTON_SNIPPET + code.slice(hook.index);
  return { code: injected, changed: true };
}

function syntaxCheck(code, outputFile) {
  try {
    new vm.Script(code, { filename: outputFile });
  } catch (error) {
    throw new Error(`После вставки JS не проходит syntax check: ${error.message}`);
  }
}

function main() {
  const inputFile = process.argv[2];
  const outputFile = process.argv[3] || 'playerjs.with_chromecast.unpacked.js';

  if (!inputFile) usageAndExit();

  const inputCode = readText(inputFile);
  let code = unpackDeanEdwardsPacker(inputCode);

  assertPlayerJs(code);

  const moduleResult = injectChromeCastModule(code);
  code = moduleResult.code;

  const buttonResult = injectChromeCastButton(code);
  code = buttonResult.code;

  syntaxCheck(code, outputFile);
  fs.writeFileSync(outputFile, code, 'utf8');

  console.log('OK');
  console.log(`Input:  ${inputFile}`);
  console.log(`Output: ${outputFile}`);
  console.log(`Unpacked: ${looksPacked(inputCode) ? 'yes' : 'input was already unpacked'}`);
  console.log(`ChromeCast module injected: ${moduleResult.changed ? 'yes' : 'already existed'}`);
  console.log(`ChromeCast button injected: ${buttonResult.changed ? 'yes' : 'already existed'}`);
  console.log(`Output size: ${Buffer.byteLength(code, 'utf8')} bytes`);
}

try {
  main();
} catch (error) {
  console.error('ERROR:', error.message);
  process.exit(1);
}