Discord.js v12升v13后DM申请机器人首答后无响应问题

基于discord.js开发的私信申请流程机器人，在v12版本下运行正常，升级到v13版本后出现流程卡死问题：用户输入第一个申请问题的答案后，机器人不再回复，无法推进后续申请步骤。
原故障代码如下：

let userApplications = {}

client.on('messageCreate', async function (message) {

if (message.author.equals(client.user)) return;
let emojii = "<a:emoji_66:840679078951911475>"
let emoji = "<a:greencheck:714998866952323122>"
let wemoji = "<a:pp62:730039453380378674>"
let authorId = message.author.id;

if (message.content === "-تسجيل") {
  message.reply("head to dm");
  if (!(authorId in userApplications)) {
    userApplications[authorId] = { "step": 1 }
    message.author.send("whats your name?");
  }

} else {

  if (message.channel.type === "dm" && authorId in userApplications) {
    let authorApplication = userApplications[authorId];

    if (authorApplication.step == 1) {
      authorApplication.answer1 = message.content;
      
      message.author.send("age?");
      authorApplication.step++;
    }
    else if (authorApplication.step == 2) {
      authorApplication.answer2 = message.content;
      message.author.send("birth date");
      authorApplication.step++;
    }
    else if (authorApplication.step == 3) {
      authorApplication.answer3 = message.content;
      message.author.send("birth place");
      authorApplication.step++;
    }
    else if (authorApplication.step == 4) {
      authorApplication.answer4 = message.content;

    message.reply("done");

      delete userApplications[authorId];

    }
  }
}
});

discord.js v13 对频道类型枚举值做了不兼容变更：

• v12版本中，私信频道的type属性值为小写字符串"dm"
• v13版本中，私信频道的type属性值改为大写字符串"DM"
  原代码中message.channel.type === "dm"的判断逻辑在v13环境下永远返回false，用户发送的第一条之后的私信回复无法进入申请流程处理分支，直接导致流程卡死。
  另外v13版本强制要求声明intent，客户端初始化时必须开启DIRECT_MESSAGES intent，否则机器人无法接收私信消息，同样会导致私信场景无响应。

需要做两处核心调整：

• 将DM频道类型判断的匹配值从"dm"改为"DM"，更稳妥的方式是引入discord.js导出的ChannelType枚举，用ChannelType.DM做判断，避免后续版本变更再次出现兼容问题
• 客户端初始化时补充开启DIRECT_MESSAGES和GUILD_MESSAGES相关intent，保证机器人能正常接收服务器频道和私信频道的消息

修复后的完整可运行代码：

const { Client, Intents, ChannelType } = require('discord.js');
// 初始化客户端时声明所需intents
const client = new Client({
  intents: [
    Intents.FLAGS.GUILDS,
    Intents.FLAGS.GUILD_MESSAGES,
    Intents.FLAGS.DIRECT_MESSAGES // 必须开启才能接收私信消息
  ]
});

let userApplications = {}

client.on('messageCreate', async function (message) {
  if (message.author.equals(client.user)) return;
  let emojii = "<a:emoji_66:840679078951911475>"
  let emoji = "<a:greencheck:714998866952323122>"
  let wemoji = "<a:pp62:730039453380378674>"
  let authorId = message.author.id;

  if (message.content === "-تسجيل") {
    message.reply("head to dm");
    if (!(authorId in userApplications)) {
      userApplications[authorId] = { "step": 1 }
      message.author.send("whats your name?");
    }

  } else {
    // 修正v13版本的DM频道类型判断
    if (message.channel.type === ChannelType.DM && authorId in userApplications) {
      let authorApplication = userApplications[authorId];

      if (authorApplication.step == 1) {
        authorApplication.answer1 = message.content;
        
        message.author.send("age?");
        authorApplication.step++;
      }
      else if (authorApplication.step == 2) {
        authorApplication.answer2 = message.content;
        message.author.send("birth date");
        authorApplication.step++;
      }
      else if (authorApplication.step == 3) {
        authorApplication.answer3 = message.content;
        message.author.send("birth place");
        authorApplication.step++;
      }
      else if (authorApplication.step == 4) {
        authorApplication.answer4 = message.content;
        // 私信场景直接发消息即可，不需要reply触发@
        message.author.send("done");
        delete userApplications[authorId];
      }
    }
  }
});

client.login('你的机器人Token');

内容的提问来源于stack exchange，提问作者Expensive Salt