使用discord.js与mineflayer开发机器人遇TypeError问题求助

我用discord.js和mineflayer开发Discord机器人，一直碰到错误：TypeError: Cannot read properties of undefined (reading 'send')。查了好多帖子都没解决，怀疑是discordBot没登录，但不确定具体原因。

代码片段：

import mineflayer from "mineflayer";
import { Client, GatewayIntentBits, Partials, EmbedBuilder } from 'discord.js';

const discordBot = new Client({
  intents: [ GatewayIntentBits.DirectMessages, GatewayIntentBits.Guilds, GatewayIntentBits.GuildBans, GatewayIntentBits.GuildMessages, GatewayIntentBits.MessageContent
  ], 'partials': [Partials.Channel, Partials.Message, Partials.User, Partials.GuildMember, Partials.Reaction]
});

const options = {
  host: server,
  username: ign,
  auth: 'microsoft'
};

const bot = mineflayer.createBot(options);

discordBot.login(process.env.token1)

discordBot.on('ready', () => {
  console.log(`The Discord bot ${discordBot.user.username} is ready!`);
  discordBot.channels.cache.get('987349559724372059').send(`The Discord bot ${discordBot.user.username} is ready!`);
});

bot.on('login', () => {
  console.log('Minecraft bot has logged in!');
});

bot.on('message', async (jsonMsg, position) => {
  if (jsonMsg != "") return;
  if (position === 'system') {
    await discordBot.channels.cache.get('987349559724372059').send(`${jsonMsg}`);
  } else if (position === 'game_info') {
    await discordBot.channels.cache.get('987349559724372059').send(`${jsonMsg}`);
  }
});

运行脚本时报错：

Minecraft bot has logged in!
file:///home/runner/InGameChat/index.js:138
        await discordBot.channels.cache.get('987349559724372059').send(`${jsonMsg}`);
                                                          ^

TypeError: Cannot read properties of undefined (reading 'send')

• 核心原因：报错说明discordBot.channels.cache.get('987349559724372059')返回了undefined，主要是两个可能：

  1. Minecraft机器人先完成登录触发了message事件，但Discord机器人还没完成登录、频道缓存也没加载好，此时找不到目标频道。
  2. 频道ID错误，或者机器人没有访问该频道的权限。

• 具体修复步骤：

  1. 等Discord机器人就绪后再处理Minecraft消息
     加个状态变量标记Discord机器人是否就绪，未就绪时直接跳过消息处理：

     let discordReady = false;
     
     discordBot.on('ready', () => {
       console.log(`The Discord bot ${discordBot.user.username} is ready!`);
       discordReady = true;
       // 这里也加个错误判断，避免就绪时也出错
       const channel = discordBot.channels.cache.get('987349559724372059');
       if (channel) {
         channel.send(`The Discord bot ${discordBot.user.username} is ready!`);
       } else {
         console.error('找不到目标频道，请检查ID或机器人权限');
       }
     });
     
     bot.on('message', async (jsonMsg, position) => {
       if (!discordReady) return;
       if (jsonMsg === "") return; // 建议用严格相等===
       const channel = discordBot.channels.cache.get('987349559724372059');
       if (!channel) {
         console.error('无法获取目标频道');
         return;
       }
       if (position === 'system' || position === 'game_info') {
         await channel.send(`${jsonMsg}`);
       }
     });
     

  2. 验证频道ID和机器人权限

     • 确认频道ID完全正确，别把服务器ID当成频道ID。
     • 检查Discord机器人在目标服务器里是否有发送消息的权限，同时确保启用了Guilds、GuildMessages这些必要的intents。

  3. 改用fetch获取频道（规避缓存问题）
     如果缓存里加载不到频道，直接用fetch方法获取更可靠，还能捕获错误：

     // 在发送消息的地方替换成这段
     try {
       const channel = await discordBot.channels.fetch('987349559724372059');
       await channel.send(`${jsonMsg}`);
     } catch (err) {
       console.error('获取频道或发送消息失败：', err);
     }
     

内容的提问来源于stack exchange，提问作者user19530601