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Here's an example code snippet on how a Discord bot can utilize slash commands with emojis in JavaScript using the Discord.js library:

const { SlashCommandBuilder } = require('@discordjs/builders');
const { MessageEmbed } = require('discord.js');

// Define a slash command
const command = new SlashCommandBuilder()
    .setName('emojis')
    .setDescription('Lists all available emojis in the server.');

// Define the execute function
const execute = async (interaction) => {
    const emojis = interaction.guild.emojis.cache;

    // Format emojis as an array of strings with their emojis
    const emojiStringArray = emojis.map((emoji) => `${emoji} - ${emoji.name}`);

    // Create a Discord embed with the emoji list
    const embed = new MessageEmbed()
        .setTitle('Server Emojis')
        .setDescription(emojiStringArray.join('\n'));

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

module.exports = {
    data: command.toJSON(),
    execute,
};

In this example, the emojis command retrieves all the emojis in the server and formats them as an array of strings with their respective emoji symbols. The execute function then creates and sends a Discord embed with the list of emojis. The emojis are displayed using their toString() method, which returns the emoji symbol as a string that can be sent as part of a message.

To use this command in a Discord server, you need to register it using the commands.create() method in the ready event of your bot:

client.on('ready', async () => {
    const command = require('./commands/emojis');
    await client.application.commands.create(command.data);
});

After registering the command, users can type /emojis in any text channel to invoke the command and see a list of all available emojis in the server.