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...

Code (markup):

Properly passing objects between my applications models/modules

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