discordjs v12 welcome message code example

Example 1: discord.js message on member add

client.on('guildMemberAdd', member => {
    member.send("Welcome!");
});

Example 2: farewell discord.js

client.on('guildMemberRemove',(member) => {
    client.channels.find('log_channel').send(`**${member.username}** has just left server.. Bye Bye`);
}