discord.js执行/warn remove报user参数类型STRING预期USER错误

基于discord.js开发Discord机器人时，调用/warn remove斜杠子命令持续抛出TypeError [COMMAND_INTERACTION_OPTION_TYPE]类型错误：提示名为user的选项类型为STRING，预期类型应为USER。报错堆栈定位到代码第69行第42列位置，自行排查未找到根因，触发报错的相关代码段如下：

module.exports = {
    category: 'Moderation',
    description: 'Warn a user',

    permissions: ['ADMINISTRATOR'],
    
    slash: true,
    guildOnly: true,

    options: [
        {
            type: 'SUB_COMMAND',
            name: 'remove',
            description: 'Removes a warning from the user',
            options: [
                {
                    name: 'user',
                    type: 'USER',
                    description: 'The user to remove the warning from',
                    required: true,
                },
                {
                    name: 'id',
                    type: 'STRING',
                    description: 'The ID of the warning to remove',
                    required: true,
                },
            ],
        }
    ],

    callback: async ({ guild, member: staff, interaction }) => {
        const user = interaction.options.getUser('user')

        if (subCommand === 'remove') {
            const warning = await warnSchema.findByIdAndDelete(id)

            return {
                custom: true,
                content: `Removed warning ${warning.id} from  <@${user?.id}>`,
                allowedMentions: {
                    users: []
                }
            }
        }
    }
}

• 斜杠命令选项的type字段传值错误：discord.js 不识别'SUB_COMMAND'/'USER'/'STRING'这类字符串类型值，必须使用官方枚举ApplicationCommandOptionType对应的固定值。传字符串时框架无法正确向Discord注册USER类型选项，Discord端会默认将该参数按STRING类型解析，调用getUser()方法取值时就会触发类型不匹配错误。
• 回调函数存在未定义变量：代码中直接使用subCommand、id两个变量，没有提前从interaction实例中解析对应值，就算修复类型问题，运行时也会抛出变量未定义的引用错误。另外user参数属于remove子命令下的嵌套选项，直接在子命令判断逻辑外取值，也可能出现跨子命令取参的异常。

• 从discord.js中引入ApplicationCommandOptionType枚举，替换所有选项的type字段值为对应枚举项
• 回调逻辑中先解析当前触发的子命令，在匹配到remove子命令后，再解析该子命令下的user、id参数值
• 修改命令配置后重启机器人，等待斜杠命令注册缓存更新（全局命令更新最长需要1小时，测试阶段可注册为服务器专属命令，更新即时生效）

修复后的核心代码如下：

const { ApplicationCommandOptionType } = require('discord.js');

module.exports = {
    category: 'Moderation',
    description: 'Warn a user',

    permissions: ['ADMINISTRATOR'],
    
    slash: true,
    guildOnly: true,

    options: [
        {
            type: ApplicationCommandOptionType.Subcommand,
            name: 'remove',
            description: 'Removes a warning from the user',
            options: [
                {
                    name: 'user',
                    type: ApplicationCommandOptionType.User,
                    description: 'The user to remove the warning from',
                    required: true,
                },
                {
                    name: 'id',
                    type: ApplicationCommandOptionType.String,
                    description: 'The ID of the warning to remove',
                    required: true,
                },
            ],
        }
    ],

    callback: async ({ guild, member: staff, interaction }) => {
        const subCommand = interaction.options.getSubcommand();

        if (subCommand === 'remove') {
            const user = interaction.options.getUser('user');
            const id = interaction.options.getString('id');
            const warning = await warnSchema.findByIdAndDelete(id);

            return {
                custom: true,
                content: `Removed warning ${warning.id} from  <@${user?.id}>`,
                allowedMentions: {
                    users: []
                }
            }
        }
    }
}

内容的提问来源于stack exchange，提问作者user17646297