Javascript – Keep getting the following; "TypeError: Cannot read properties of undefined (reading 'query')"

Using Node to connect to PostgreSQL database and make a POST request. The database itself is connected (tested with some simple GET requests). But it seems that for some reason the client is not defined when running my registration function.

Here’s my code for connecting to the database;

import pg from "pg"; 

const client = new pg.Client({
    host: 'localhost',
    user: 'stephen',
    port: 5433,
    database: "ecommerceapp"
});  

client.connect(); 

client.query(`SELECT * FROM customer`, (err, res) => {
    if(!err) {
        console.log(res.rows); 
    } else {
        console.log(err.message);  
    }
    client.end; 
}); 

And here’s my user registration function

const bcrypt = require("bcrypt"); 

const jwt = require("jsonwebtoken"); 

const { client } = import("../db/index.mjs");
 
exports.register = async (req, res) => {
    const { name, email, password} = req.body; 
    
    try {
        const data = await client.query(`SELECT * FROM customer WHERE email=$1`, [email]); 
        const arr = data.rows; 
        if(arr.length != 0) {
            return res.status(400).json({
                error: "Email already in use.",
            });
        }
        else {
            bcrypt.hash(password, 10, (err, hash) => {
                if(err)
                   return res.status(err).json({
                        error: "Server error",
                    }); 
                const user = {
                    name, 
                    email,
                    password: hash
                }; 
                var flag = 1; 

                client.query(`INSERT INTO customer (name, email, password) VALUES ($1, $2, $3);`, [user.name, user.email, user.password], (err) => {
                    if(err) {
                        flag = 0; 
                        console.error(err); 
                        return res.status(500).json({
                            error: "Database error", 
                        })
                    } else {
                        flag = 1;
                        res.status(200).send({message: 'User added to databse, not verified'}); 
                    }
                })
                if(flag) {
                    const token = jwt.sign({
                        email: user.email
                    },
                    process.env.SECRET_KEY
                    );
                }
            })
        }
    }
    catch(err) {
        console.log(err); 
        return res.status(500).json({
            error: "Database error while registering user",
        });
    };
}

I have tried variations of requiring/importing the {client} variable into my registration code, but I’m worried that some kind of unseen error in the code is being thrown and as a result, client is undefined.