kevinmichaelchen

Functional Domain-Driven Design with Effect-TS Monoid Value Objects

Sources

• Domain-driven design in functional programming
• DomainModelingwithMonoids.pdf
• Railway-oriented Programming
• Referential transparency
• Functional Core Imperative Shell

kevinmichaelchen

CUPID: Properties for Joyful Code

CUPID is a framework for creating "joyful code" that humans can understand and enjoy working with. As Martin Fowler noted: "Good programmers write code that humans can understand."

The Five Properties

🧩 Composable

kevinmichaelchen

🔄 Prisma vs Kysely: Unordered Migrations Comparison

📋 Executive Summary

Prisma does not suffer from the same unordered migrations problem that affects Kysely. While Kysely strictly enforces alphabetical/chronological ordering of migrations and fails when migrations are executed out of order, Prisma uses a more flexible approach that tracks migration history in the database and provides tools to handle divergent migration histories.

⚠️ The Kysely Problem

kevinmichaelchen

Kysely Migration Ordering: Handling Parallel Development

The Problem

When multiple developers work on feature branches simultaneously, they often create migrations with timestamps that become out of order when merged. This is a common scenario:

• Developer A creates migration 20240112_1200_add_users.sql on their feature branch
• Developer B creates migration 20240112_1201_add_products.sql on their feature branch
• Developer B merges first, production runs the 12:01pm migration
• Developer A merges second, but now there's a problem...

kevinmichaelchen

Migration Systems: Traditional Timestamp-Based vs Atlas

If you've ever seen Kysely return the error below, this post is for you.

☠️ Error: corrupted migrations: previously executed migration

The Problem with Traditional Timestamp-Based Migration Systems

kevinmichaelchen

GraphQL

https://graphbrainz.fly.dev lets you do cool GraphQL queries.

Page through an artist's albums

query {
  lookup {
    artist(mbid: "144ef525-85e9-40c3-8335-02c32d0861f3") {

kevinmichaelchen

You don't really need Homebrew

[pkgx][pkgx] is a package manager that can basically do everything Homebrew can.

You can find full installation instructions [here][pkgx-install], but it's simplest to run:

curl -fsS https://pkgx.sh | sh

kevinmichaelchen

Created with bpb:

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kevinmichaelchen

# lives in ~/.tmux.conf
set -g activity-action other
set -g assume-paste-time 1
set -g base-index 0
set -g bell-action any
# had to comment this out to g et it to work
#set -g default-command
set -g default-shell /usr/bin/zsh
set -g default-size 80x24
set -g destroy-unattached off

kevinmichaelchen

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	"basics": {
		"name": "Kevin Chen",
		"label": "Software Developer",
		"picture": "https://avatars3.githubusercontent.com/u/5129994?s=400&v=4",
		"email": "[email protected]",
		"phone": "(202) 738-4916",