TypeScript Coffee

TypeScript 7 Went Native: What Actually Changes And What Doesn't

Everyone's heard by now that TypeScript "went native." And I keep seeing the same wrong conclusion... Read More

How I Smashed a Bug in a Shared Authentication Library

This is a submission for DEV's Summer Bug Smash: Smash Stories powered by Sentry. This happened a... Read More

I Built a Tool to Visualize DSA. Let’s Learn Together! (DSA View View 👀👀)

Hoi hoi! I’m @nyaomaru, a frontend engineer currently fighting the intense European heatwave by... Read More

Self-Healing Playwright: building a locator-healing wrapper with AI (Part 1)

This is part one of the project. In this new era of AI, I confess that sometimes I don't feel like... Read More

🐘 TypeScript for PHP? YES, that's possible! And it's not what you think...

It is time to bring opposites together, to stir up these stagnant waters, and to restore an industry... Read More

Fixing Exact Package Search Relevance in npmx

This is a submission for DEV's Summer Bug Smash: Clear the Lineup powered by Sentry. ... Read More

How I Made JavaScript Execution Visual and Rewindable (DSA View View 👀👀)

Hoi hoi! I'm @nyaomaru, a frontend engineer who was recently knocked off my feet by how good the... Read More

Fixing a Silent Cache Bug in npmx.dev

This is a submission for DEV's Summer Bug Smash: Clear the Lineup. The bug npmx.dev is a... Read More

Clear the Lineup — doesNotEqual was always true for single-select survey answers in Formbricks

This is a submission for DEV's Summer Bug Smash: Clear the Lineup. Project... Read More

You're rethrowing errors and losing context. `Error.cause` fixes that.

Error handling has a quiet problem. You catch an error deep in a call stack, wrap it in something... Read More

linkedSignal() Writes Back: A Trace Through the Reactive Graph 🔍🚀

Let's be honest: linkedSignal() always had a bit of a split personality. It read beautifully from... Read More

I Rewrote a OneNote MCP Server in TypeScript — Here's What I Learned About Microsoft Graph Auth

If you use Claude, Cursor, or any MCP-compatible AI assistant, you've probably noticed how useful it... Read More

I tried to compile TypeScript into a native binary with scriptc

TL;DR: I tried to compile the TypeScript 6 compiler into a native binary with scriptc, and I failed... Read More

I was tired of studying security tools from static cheatsheets, so I built ShellStack

I was tired of studying security tools from static cheatsheets, so I built ShellStack When... Read More

It started with a birthday present — why I built an open-source QR code generator

Last year, all I wanted was a QR code for a birthday present. Scan the code, get the surprise. Thirty... Read More

How I Stopped 429 Retries from Duplicating Successful Batch Jobs

This article is an English translation of the original Japanese article. This is a submission for... Read More

You still write `finally { resource.close() }`. The `using` keyword does it automatically.

You've written this pattern — or something close to it — many times: const timer =... Read More

You've been doing Set math by hand. JavaScript finally shipped `.union()`, `.intersection()`, and friends.

You've written some version of this: const intersection = new Set([...setA].filter(x =>... Read More

The Button That Sent People to a Blank Form

Every service page on my portfolio ends with the same call to action: a big Start Project button.... Read More

Backend/Domain foundation

Today I continued my TypeScript learning project after a short break. Instead of jumping into React... Read More

MCP Went Stateless: Migrating to the 2026-07-28 Spec (and Proving It Works)

📖 TL;DR The 2026-07-28 spec shipped final on July 28, 2026 (RC locked May 21). It is the biggest... Read More

The bug that differential fuzzing cannot find

I ported a cron parser from TypeScript to Go and ran 36,000 differential test cases with zero divergence. Then I found a bug that no amount of fuzzing could ever have caught — because the output isn't a function of the input. Read More

I reviewed a NestJS fintech backend where the numbers never quite matched, this is the fix

I was asked to look at a fintech backend where something small but persistent kept happening. Every... Read More

Sandboxing Patterns for Local AI Agents With Filesystem Access

A while back I wrote about running local AI agents on your own code, and it became the most-read... Read More