@discordjs/voice with @discordjs/next

// (Let me know if it needs to be a working code)
import { GatewaySendPayload } from "@discordjs/core";
import {
  DiscordGatewayAdapterLibraryMethods,
  createAudioPlayer,
  createAudioResource,
  joinVoiceChannel,
} from "@discordjs/voice";
import { WebSocketManager } from "@discordjs/ws";

const connection = joinVoiceChannel({
  adapterCreator: voiceAdapterCreator(channelId, gateway),
  guildId,
  channelId,
});
const resource = createAudioResource("./rickroll.mp3");
const player = createAudioPlayer();
const adapters = new Map();

player.play(resource);
connection.subscribe(player);

function voiceAdapterCreator(channelId: string, gateway: WebSocketManager) {
  // from: https://github.com/discordjs/discord.js/blob/bfc7bb55641c60d4d67e57c27c9d1e63b6f30c9b/packages/discord.js/src/structures/Guild.js#L1410
  return (methods: DiscordGatewayAdapterLibraryMethods) => {
    adapters.set(channelId, methods);

    return {
      sendPayload: (data: GatewaySendPayload) => {
        gateway.send(0, data);

        return true;
      },
      destroy: () => {
        adapters.delete(channelId);
      },
    };
  };
}