discord.js/src/client/websocket/packets/handlers/GuildBanAdd.js

// ##untested handler##

const AbstractHandler = require('./AbstractHandler');
const { Events } = require('../../../../util/Constants');

class GuildBanAddHandler extends AbstractHandler {
  handle(packet) {
    const client = this.packetManager.client;
    const data = packet.d;
    const guild = client.guilds.get(data.guild_id);
    const user = client.users.add(data.user);
    if (guild && user) client.emit(Events.GUILD_BAN_ADD, guild, user);
  }
}

/**
 * Emitted whenever a member is banned from a guild.
 * @event Client#guildBanAdd
 * @param {Guild} guild The guild that the ban occurred in
 * @param {User} user The user that was banned
 */

module.exports = GuildBanAddHandler;