// PrismarineJS
const mc = require('minecraft-protocol');
const server = mc.createServer({ ... });

server.on('login', (client) => {
  ...

  let playerChannel = '';
  const lunarPlayer = new LunarClient.LunarClientPlayer({
    customHandling: {
      registerPluginChannel(channel) {
        playerChannel = channel;

        // PrismarineJS way of sending packets
        client.write('custom_payload', {
          channel: 'REGISTER',
          data: Buffer.from(channel + '\0')
        });
      },

      sendPacket(buffer) {
        // PrismarineJS way of sending packets
        client.write('custom_payload', {
          channel: playerChannel,
          data: buffer
        })
      }
    }
  });

  // Sending a cooldown
  // with id of `pearl`
  // for 15s and an ender
  // pearl as item (368)
  lunarPlayer.addCooldown('pearl', 15000, 368);
});