discord.js 如何检查用户是否更改了昵称并相应地更新变量

Question

首先我想说这不是我的代码，我只是在使用它：https://github.com/zeOxx/VoiceLogBot

基本上，每当用户离开或加入语音频道时，此代码都会发送一条消息，该消息包含他们的昵称。我面临的问题是，如果用户更改了昵称，之后的每条消息仍会显示原来的。

我环顾四周，一无所获。下面是代码的相关部分：

client.on('voiceStateUpdate', (oldMember, newMember) => {
    // Check if voiceLogChannel has been set
    if (data.voiceLogChannel === "")
        return;
    
    let username = newMember.displayName;
    
    let oldVCID = oldMember.voiceChannelID;
    let newVCID = newMember.voiceChannelID;

    let oldChannelName = (oldVCID != null && typeof oldVCID != undefined) ? channels.get(oldVCID).name : null;
    let newChannelName = (newVCID != null && typeof newVCID != undefined) ? channels.get(newVCID).name : null;
    
    if (oldChannelName === null)
        voiceLogChannel.sendMessage(`!whitelist add ${username}`);
    else if (newChannelName === null)
        voiceLogChannel.sendMessage(`!whitelist remove ${username}`);
    else
        voiceLogChannel.sendMessage(`!whitelist add ${username}`);
});