I switched a codebase from local Postgres database to Vercel Postgres, which comes with its own optimized package.

I used this to set up Kysely:

import {
  Kysely,
  PostgresDialect,
} from 'kysely'

import pg from 'pg'

const POSTGRES_URL = //...from env

const dialect = new PostgresDialect({
  pool: new pg.Pool({
    connectionString:
      POSTGRES_URL
    max: 10,
  }),
})

export const db = new Kysely({
  dialect
})

With Vercel Postgres, I used:

import { createKysely } from '@vercel/postgres-kysely'

const POSTGRES_URL = //...from env

export const db = createKysely({
  connectionString: POSTGRES_URL
})

The db now already know how to look up the environment variable POSTGRES_URL

Lessons in this unit:

0:	Introduction
1:	Introduction to PostgreSQL
2:	How to install PostgreSQL on macOS
3:	How to create a PostgreSQL database
4:	Navigating Databases in PostgreSQL
5:	PostgreSQL User Permissions
6:	Tables and Data Types
7:	Where to host a PostgreSQL database
8:	PostgreSQL vs MySQL
9:	Troubleshooting PostgreSQL
10:	Vercel Postgres, no transactions?
11:	Set up Lucia Auth for local Postgres DB vs Vercel Postgres
12:	▶︎ Connect to Postgres local vs Vercel Postgres with Kysely