Discord.js：机器人执行离线命令时无法发送预定义通知消息问题

Hey there! I can spot exactly what's going wrong here. Your bot is shutting down before it gets a chance to send the message because of how asynchronous operations work in JavaScript, plus a duplicate server.close() call.

Let me break it down:

• client.channels.fetch() and channel.send() are asynchronous operations (they return Promises). That means they run in the background while the rest of your code keeps executing.
• In your original code, right after starting the fetch/send process, you immediately call server.close() again. This shuts down the bot's connection to Discord before the message ever gets sent successfully.

Here's how to fix it – we need to make sure server.close() only runs after the message has been sent (or if sending fails, still clean up):

Option 1: Using Promise chaining (keeping your original style) #

if(message.content == config.goesOff){
  client.channels.fetch(channelId.toString())
    .then(channel => channel.send("The bot is shutting down"))
    .then(() => {
      console.log("Shutdown message sent, closing server...");
      server.close();
    })
    .catch(error => {
      console.error("Failed to send shutdown message:", error);
      // Even if the message fails, we still want to shut down the server
      server.close();
    });
  return;
}

Option 2: Using async/await (cleaner and easier to read) #

If you convert your message handler to an async function, you can write this in a more straightforward way:

// Make sure your messageCreate handler is marked as async
client.on('messageCreate', async (message) => {
  if(message.content == config.goesOff){
    try {
      // Wait for the channel to be fetched
      const channel = await client.channels.fetch(channelId.toString());
      // Wait for the message to be sent
      await channel.send("The bot is shutting down");
      // Now close the server
      server.close();
    } catch (error) {
      console.error("Error during shutdown:", error);
      // Fallback to closing the server even if something goes wrong
      server.close();
    }
    return;
  }

  // Rest of your bot's command logic...
});

The key change here is removing the extra server.close() outside the Promise chain/async block. This ensures the bot only disconnects after it's finished communicating with Discord's API to send the message.

内容的提问来源于stack exchange，提问作者Fusca