ERROR_ACCESS_DENIED_ERROR mysql why does an error occur with valid data?

Question

Node.js

Good afternoon. I can't connect to the database. I'm working with the database through the code below.
mysql.js

const { mysql,dotenv,initializeDotenv,util } = require('./packages')

class Mysql {

  constructor(host,user,password,database,socket) {

    this.connection
    this.host = host
    this.user = user
    this.password = password
    this.database = database
    this.socket = socket

    if(socket) {
      this.connection = mysql.createPool({
           socketPath: this.socket,
           port: 3306,
           user: this.user,
           password: this.password,
           database: this.database
      })
    }

    else {
      this.connection = mysql.createPool({
           host: this.host,
           port: 3306,
           user: this.user,
           password: this.password,
           database: this.database
      });
    }

    return this.connection
  }

}

const {HOST,USER,PASSWORD,DATABASE,SOCKET} = process.env;

const pool = new Mysql(HOST,USER,PASSWORD,DATABASE,SOCKET)

pool.getConnection((err, connection) => {
  if (err) {
    console.error(err.code)
  }
  if (connection) connection.release()
})

pool.query = util.promisify(pool.query)

module.exports = { Mysql,pool }

.env

#Project mode
NODE_ENV=production

#App port
PORT=3000

#Mysql

HOST=localhost

USER=root

PASSWORD=

DATABASE=test

SOCKET=

#Bcrypt

COMPLAXITY=10

#Secret for sessions

SECRET=$$999$$