TypeScript Coffee

EasyPollVote [Dev Log #2]

Welcome to the Second DEV LOG! Welcome to the second Dev Log of my full stack application... Read More

I built a 200 line AI router in TypeScript. My monthly bill dropped 41%.

I track my own AI spend across three projects. In March, the line item that grew fastest was not... Read More

EasyPollVote [Dev Log #4]

Welcome to the Forth DEV LOG! Welcome to the forth Dev Log of my full stack application... Read More

EasyPollVote [Dev Log #3]

Welcome to the Third DEV LOG! Welcome to the third Dev Log of my full stack application... Read More

How to Stop AI Slop in Production: A Two-Layer Validator for LLM Output (2026)

A user reached out to us this week. Their generated newsletter contained the word delve. Twice. This... Read More

I got tired of wiring the same caching stack every project, so I built LayerCache

Every Node.js service I've worked on hits the same caching wall. It always starts the same way. You... Read More

Function Calling Harness 2: CoT Compliance from 9.91% to 100%

TL;DR 9.91% is not "did the model get it right on the first try" — it's "did the model walk... Read More

I'm Rebuilding My Old Invoice App and This Time I Actually Know What I'm Doing

So I have this old project called Invoicepedia. Built it like 6 months ago when I was just starting... Read More

Building a Universal Drafts System in a VS Code Extension — Part 1: Types & Storage

How I designed the Draft type, DraftsService, and the save/upsert flow that powers DotShare... Read More

npm audit --json Is Unreadable. I Wrote a Formatter With Zero Dependencies.

npm audit --json Is Unreadable. I Wrote a Formatter With Zero Dependencies. npm audit has... Read More

Building a MIME Type Lookup CLI in TypeScript — 800+ Types, Magic Bytes, and Zero Dependencies

Building a MIME Type Lookup CLI in TypeScript — 800+ Types, Magic Bytes, and Zero... Read More

I got tired of messy TypeScript migrations in Node.js, so I built fast-ts-integrator

Adding TypeScript to an existing Node.js project sounds simple until it isn’t. A few files in,... Read More

Kimi K2.6 vs. Claude Opus 4.7 in a Weird Game Coding Test ✅

Kimi K2.6 has been getting a lot of love lately, especially from devs who want a strong coding model... Read More

How I Built a Whiteboard App with 3 Dependencies

The Problem Every whiteboard app I tried wanted me to sign up, sync to the cloud, or load... Read More

5 TypeScript Defaults That Quietly Changed in 2026 (And Why Your Build Is Now Broken)

TypeScript 6.0 flipped five tsconfig defaults. Each one is a tiny PR that bricks somebody's CI. Here is what changed, what it breaks, and the one-line fix. Read More

Why I Didn’t Let AI Handle My Scroll Animation: Astro, React, and TypeScript Architecture

Hoi hoi! I'm @nyaomaru, a frontend engineer who once panicked because I triggered a fire alarm while... Read More

Make Your Hono Authorization Server Work on Any Host

How to remove the hardcoded ISSUER constant from your Hono OIDC server so it works correctly on localhost, staging, and production without any code changes. Read More

AI Deleted My Tests and Said 'All Tests Pass' — A Horror Story from Porting 'typia' from TypeScript to Go

TL;DR The job. Take typia's existing TS files, translate the contents line by line into... Read More

Handling `unknown` in TypeScript… isn't it painful?

Hi there 👋 I'm a frontend engineer based in the Netherlands, currently suffering from hay fever... Read More

The 4 classic bugs every multi-service Node.js app hits (and how to stop reinventing the wheel)

Every time I read a post-mortem from a different team, at least one of these four bugs is in... Read More

@ttsc/lint - I made 20x faster TS Lint by building it into typescript-go — one compile catches both

TL;DR A typical TypeScript project runs tsc for type checking, then runs eslint again for... Read More

I rewrote my auth library to run on Cloudflare Workers. Here is what broke.

Most TypeScript auth libraries assume Node.js. They reach for crypto.randomBytes, Buffer, the Node fs... Read More

Let the ORM fight begin!

Every few months, a new round of "which TypeScript ORM should we use?" breaks out — on team chats, on... Read More

I was sick of InversifyJS after 3 years in production, so I built a better DI container

Three years. That's how long we ran InversifyJS in production at a medium-sized Typescript SaaS. It... Read More