Properly passing objects between my applications models/modules

I have several models/modules such as User, Wallet, both these modules that are called from the express application such as User.login(req,res);

right now in each User.js and Wallet.js I am including database.js which looks like this:

var mysql = require('mysql2/promise')
var pool = mysql.createPool({
    connectionLimit: 10,
    host: 'localhost',
    user: 'x',
    password: 'x',
    database: 'x'
});
pool.getConnection((err, connection) => {
    if (err) {
        if (err.code === 'PROTOCOL_CONNECTION_LOST') {
            console.error('Database connection was closed.')
        }
        if (err.code === 'ER_CON_COUNT_ERROR') {
            console.error('Database has too many connections.')
        }
        if (err.code === 'ECONNREFUSED') {
            console.error('Database connection was refused.')
        }
    }
    if (connection) connection.release()
    return
})
module.exports = pool

Code (markup):

then in User.login() I can use pool.query/pool.execute.

My question is there a better way of including this instead of require('./database.js) in both User.js and Wallet.js? Ideally calling database.js in my app.js main application file and having pool be visible to modules I include like User.js and Wallet.js