Billy/events/guildMemberAdd.js

const { WelcomeChannel } = require("discord.js");
const { userMention } = require("@discordjs/builders");

module.exports = {
    name: 'guildMemberAdd',
    async execute(member, guild) {

        await guild.fetchWelcomeScreen()
            .then(() => {
                const channel = this.welcomeChannels;
                channel.forEach(async element => {
                    const nickname = memberNicknameMention(member.id);
                    await interaction.reply('Bienvenue ' + nickname + ' ! Mets toi à l\'aise, il y a des bières dans le frigo.');
                })
            })
            .catch(console.error);
    },
};