制作Discord嵌入斜杠命令时遇CombinedError问题求助

开发Discord Embed斜杠命令时触发CombinedError，包含两个ValidationError：

• s.nullish期望undefined或null，却收到[Function: displayAvatarURL]
• s.string期望字符串类型，却收到[Function: displayAvatarURL]

检查代码后未发现明显问题，调整代码反而引发更多错误，附上报错信息与代码：

报错信息 #

The error:
CombinedError (2)
  Received one or more errors

  1 ValidationError > s.nullish
  |   Expected undefined or null
  |
  |   Received:
  |   | [Function: displayAvatarURL]

  2 ValidationError > s.string
  |   Expected a string primitive
  |
  |   Received:
  |   | [Function: displayAvatarURL]

原代码 #

const { SlashCommandBuilder, EmbedBuilder } = require("discord.js");

module.exports = {
    data: new SlashCommandBuilder()
        .setName("embed")
        .setDescription('Return an embed.'),
    async execute(interaction, client) {
        const embed = new EmbedBuilder()
            .setTitle(`This is an EMBED`)
            .setDescription('This is a EMBED description')
            .setColor(0xFA03CA)
            .setImage(client.user.displayAvatarURL())
            .setThumbnail(client.user.displayAvatarURL())
            .setTimestamp(Date.now())
            .setAuthor({
                url: `https://www.twitch.tv/x333en`,
                iconURL: interaction.user.displayAvatarURL(),
                name: interaction.user.tag
            })
            .setFooter({
                iconURL: client.user.displayAvatarURL(),
                text: client.user.tag
            })
            .setURL(`https://discord.gg/8YtDhpbCJf`)
            .addFields([
                {
                    name: `Field 1`,
                    value: `Field Value 1`,
                    inline: true
                },
                {
                    name: `Field 2`,
                    value: `Field value 2`,
                    inline: true
                }
            ]);

        await interaction.reply({
            embeds: [embed]
        })
    }
}

报错原因是传递了displayAvatarURL方法本身而非执行后的字符串结果。Embed的iconURL、setImage等字段需要的是字符串格式的图片链接，而displayAvatarURL是一个方法，必须通过加括号()调用它才能返回对应的URL字符串。

检查代码中所有使用displayAvatarURL的位置，确保都添加了括号调用。修改后的代码如下：

const { SlashCommandBuilder, EmbedBuilder } = require("discord.js");

module.exports = {
    data: new SlashCommandBuilder()
        .setName("embed")
        .setDescription('Return an embed.'),
    async execute(interaction, client) {
        const embed = new EmbedBuilder()
            .setTitle(`This is an EMBED`)
            .setDescription('This is a EMBED description')
            .setColor(0xFA03CA)
            .setImage(client.user.displayAvatarURL())
            .setThumbnail(client.user.displayAvatarURL())
            .setTimestamp(Date.now())
            .setAuthor({
                url: `https://www.twitch.tv/x333en`,
                iconURL: interaction.user.displayAvatarURL(),
                name: interaction.user.tag
            })
            .setFooter({
                iconURL: client.user.displayAvatarURL(),
                text: client.user.tag
            })
            .setURL(`https://discord.gg/8YtDhpbCJf`)
            .addFields([
                {
                    name: `Field 1`,
                    value: `Field Value 1`,
                    inline: true
                },
                {
                    name: `Field 2`,
                    value: `Field value 2`,
                    inline: true
                }
            ]);

        await interaction.reply({
            embeds: [embed]
        })
    }
}

（注：若原代码中存在漏写括号的情况，补充括号即可解决问题）

内容的提问来源于stack exchange，提问作者kazzo