Node.js 如何在route中使用postgresql？

这是我在databases.js中的代码，我想在这里解释我的数据库

import { Pool } from "pg";
export default () =>
 new Pool({
  user: "postgres",
  host: "127.0.0.1",
  database: "test",
  password: "test",
  port: 5432,
 });

我在app.js中使用这个 这是我的错误

import client from "../databases/databses.js";
client.query(
 "CREATE TABLE users(id SERIAL PRIMARY KEY, username VARCHAR(40) NOT NULL,userTwitterId 
  VARCHAR(40) NOT NULL,avatar TEXT,is_Private BOOLEAN,userInfo_json jsonb NULL,followers 
   VARCHAR [],following VARCHAR [])",
(err, res) => {
  console.log(err, res);
  pool.end();
}
);

TypeError: client.connect is not a function