TypeScript Coffee

is-kit Reached 100 Stars ⭐🎉 Here’s What Changed Since 50

Hoi hoi! YAY! is-kit just reached 100 GitHub stars⭐ 🎉🎉🎉 When it reached 50 stars, I wrote about how... Read More

How Do We Extract the “Why” from a PR into a CHANGELOG with Jev? 🤔

Hoi hoi! 👋 I'm @nyaomaru, a frontend engineer currently building an AI-assisted CHANGELOG generator... Read More

TypeScript Compiler API: Preserving Child Node Narrowing in Reusable Type Guards 🔧

Hoi hoi! 👋 I'm @nyaomaru, a frontend engineer exploring new possibilities with Jev 😸 (I'm also... Read More

How Do You Validate `unknown` in TypeScript Without a Schema Library? 🛡️

Hoi hoi! 👋 I'm @nyaomaru, a frontend engineer who is obsessed with gamba. 😸🦐 Recently, I was... Read More

Why Your TypeScript Code Still Crashes in Production

A practical visual guide to the TypeScript mental model. Discover why types vanish at runtime, how structural typing works, and how to write clean, type-safe code that never crashes in production. Read More

Migrating a Real TypeScript OSS Library from tsup to tsdown 🔧

The config migration was small. Preserving the package contract was the interesting part. Hoi hoi!... Read More

Zone.js Hijacked Your Browser for 8 Years. Here's What Replaced It.

A visual deep dive into how Angular tore out global browser monkey-patching and rebuilt its reactivity engine from scratch using Signals and Zoneless change detection. Read More

My OSS Projects: dets

This is part of my series "My Open-Source Projects", where I walk through the projects I started or... Read More

"we should go out this weekend": I built a Discord member that holds the clock until we're outside

This is a submission for the Hacktoberfest Open-Source AI Challenge Week 1: Touch Grass TL;DR.... Read More

Claude Code mods: Brickfall, a brick breaker that's loud without getting in the way

After the Minesweeper and Doom, the third game in the arcade is a brick breaker after Arkanoid. The... Read More

How I finally understood the Liskov Substitution Principle

The Intro Halfway through SOLID! We are at the L, the one with the scary name: the Liskov... Read More

Translation Is Not Agreement: Build a Clarification Handshake for Multilingual Chat

Machine translation can make a group message readable without making its intent certain. Build a reproducible TypeScript clarification workflow for Tencent RTC Social Messaging with author-only answers, revision checks, explicit notification failures, and verification tests. Read More

AsyncLocalStorage vs Request-Scoped Providers: The DI Trap That Taxes Latency

Here's a logger. It's a dozen lines and it looks completely harmless: request-logger.ts import {... Read More

TypeScript 7 Is Up to 10x Faster. Should You Upgrade Now?

Benchmark TypeScript 7 safely, compare real project results, and find compatibility problems before changing your main branch. Read More

I Killed My Electron App Twice to Test Crash Recovery

"We have crash recovery" is an easy thing to claim. I wanted to know what happens if the process... Read More

🪪 Avatar RS: Very Efficient Avatar Components for WASM Frameworks

Bien le bonjour 👋! Every WASM app eventually needs an avatar. Profile pictures, user cards,... Read More

How I finally undestood what loosely coupled modules are

Photo by Glen Carrie on Unsplash The Intro Here goes another one of those "it... Read More

How I finally understood the Single Responsibility Principle

The Intro Welcome to the first stop of a five-part road trip through SOLID. Five letters,... Read More

I added a type-checked pipeline operator to TypeScript — including TSX

A proof-of-concept TypeScript compiler with a pipeline operator. I searching testers and... Read More

Claude Code Context Window Management in 2026: What Gets Included, What Gets Dropped, and How to Control It

Most Claude Code performance problems stem from unmanaged context windows. Learn what gets included, what gets dropped, and how to control the auto-compaction process that silently deletes your conversation history. Read More

#HackAVP AVPRO : l'espace recruteur qui remplace la boîte mail par un swipe (et explique chaque score)

Une candidature reçue n'est pas une candidature traitée. Côté candidat, Adopte un Job permet de... Read More

Never Execute the Translation: Build Language-Safe Slash Commands for Tencent RTC Chat

Build a reproducible TypeScript command boundary for a multilingual social-messaging app. Original messages may create moderation reports, translated text may help people read them, and only a human reviewer may decide the outcome. Read More

Stop Formatting Currency With Regex. `Intl.NumberFormat` Does It.

A hand-rolled formatMoney() with toFixed() and a comma regex looks fine in a US demo and quietly breaks the moment a real user, a negative balance, or a non-dollar locale shows up. Intl.NumberFormat has handled all of it, built into every modern browser, since before most teams' codebases existed. Read More

TC39 `Float16Array` Is Baseline 2026: What JavaScript Developers Need for ML and Graphics Workloads

Float16Array reached Stage 4 and Baseline 2026. Learn when 16-bit floats matter for WebGPU machine learning, HDR graphics, and binary data pipelines — and when they cause silent precision loss. Read More