如何创建一个reaction收集器，该收集器可以输出做出反应的用户的名称，并将它们保存在discord.js中？

const Discord = require('discord.js');
const client = new Discord.Client();

client.on('ready', () => {
  console.log(`Logged in as ${client.user.tag}!`);
});

client.on('messageReactionAdd', (reaction, user) => {
  console.log(`${user.tag} reacted with ${reaction.emoji.name}`);
});

client.login('your-token-goes-here');

const Discord = require('discord.js');
const client = new Discord.Client();
const mongoose = require('mongoose');

// 连接到MongoDB数据库
mongoose.connect('mongodb://localhost/reactions', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => console.log('Connected to MongoDB'))
  .catch(err => console.error('Failed to connect to MongoDB', err));

// 定义用户模型
const User = mongoose.model('User', new mongoose.Schema({
  name: String,
}));

client.on('ready', () => {
  console.log(`Logged in as ${client.user.tag}!`);
});

client.on('messageReactionAdd', async (reaction, user) => {
  console.log(`${user.tag} reacted with ${reaction.emoji.name}`);

  // 保存用户的名称到数据库
  const newUser = new User({ name: user.username });
  await newUser.save();
});

client.login('your-token-goes-here');