how define emojis in discord.js code example

Example 1: how to define emojis from your server in discord.js

var Emoji = message.guild.emojis.cache.find(emoji => emoji.name === 'NAME_OF_YOUR_EMOJI')

//how to use them? 
// for exaple:
message.reply(`${Emoji}`);

Example 2: discord.js emoji

// Do you know the name of the emoji? if so, you can simply do this:
message.channel.send("<:emoji name:emoji id>")
// If not, you could possibly do,
const emoji = bot.emojis.cache.get("emoji id")

message.channel.send(`${emoji}`
//I assume the emoji has to be cached for the method above to work, 
// i'm sure someone else could brew up a better solution. Hope i could help!