sequelize

index.js

const Sequelize = require('sequelize')
const sequelize = new Sequelize({
	dialect: 'sqlite',
	storage: 'db.sqlite',
	logging: (...args) => console.log(...args)
})

const Model = Sequelize.Model

class User extends Model {}
User.init({
	name: {
		type: Sequelize.STRING,
		allowNull: false
	}
}, {
	underscored: true,
	sequelize,
	modelName: 'user'
})

class Tweet extends Model {}
Tweet.init({
	message: {
		type: Sequelize.STRING,
		allowNull: false
	}
}, {
	underscored: true,
	sequelize,
	modelName: 'tweet'
})
User.hasMany(Tweet)
Tweet.belongsTo(User)
User.belongsToMany(User, {as: 'Follow', through: 'follow_follower'})

;(async () => {
	await sequelize.sync()

	const user1 = await User.create({
		name: '1st'
	})

	const user2 = await User.create({
		name: '2nd'
	})

	await user1.addFollow(user2)

	const tweet = await Tweet.create({
		message: 'hello world',
		userId: user1.id
	})
	
	console.log(await User.findAll({
		include: [
			{
				model: Tweet
			}
		]
	}))

})()

package.json

{
  "name": "sequelize-trial",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "sequelize": "^5.10.2",
    "sqlite3": "^4.0.9"
  }
}