Can you understand this JavaScript?

A Perplexing JavaScript Parsing Puzzle — It looks deceptively simple – just 14 characters of JavaScript – but after working with JavaScript for 29 years, I got it wrong. A clue: it goes back to a browser-related quirk from 30 years ago..

Hillel Wayne

TypeScript's Compiler to Get 10x Faster — TypeScript has shaken up the JavaScript ecosystem in recent years with an increasing number of developers relying on its strong typing and added structure. TypeScript’s compiler isn’t particularly fast, though, but the TypeScript team at Microsoft are changing that by porting it to Go!

Anders Hejlsberg (Microsoft)

Build a Secure Project Management — Learn a security-first approach to building web applications by building a secure project management platform with Next.js.

Clerk sponsor

Building APIs with Next.js — A detailed, official introduction to the concepts behind using Next.js’ App Router and route handlers to build public APIs you can expose to web, mobile, and third-party clients.

Lee Robinson

How The New York Times Migrated from Enzyme to React Testing Library — A thorough look at the technical challenges and strategies the NYT used to perform a piecemeal upgrade of its React testing approach without disrupting either end users or other developers.

Felipe Buenaño (NYT Open Team)

Which AI Model Is Best for Fixing Unit Test Errors? Claude, o3-mini, GPT-4o? — Better context wins every time. Wallaby enters the chat to give AI what it needs - test coverage and runtime values - to debug smarter.

Wallaby Team sponsor

How ECMAScript Engines Optimize Your Variables — From the authors of the Boa JS Rust-powered JavaScript engine.

Boa Developers

Refractor 5.0: Robust Virtual Syntax Highlighting using Prism — Wraps the powerful Prism syntax highlighter to output objects instead of an HTML string so you can manipulate and render it as you wish (e.g. in a VDOM or at the terminal). Lowlight, by the same author, offers the same functionality but backed by highlight.js.

Titus Wormer

svg2pdf.js: SVG to PDF Conversion in the Browser — There’s an online playground to give you a feel for what it can do.

yWorks GmbH

🔒 Protect Against AI Bots, Fraud, and Abuse in Real Time — WorkOS Radar protects your app with advanced device fingerprinting — stop fake signups, free tier abuse, bot attacks and brute force attempts today.

WorkOS sponsor

⌘K: A Fast, Composable, Unstyled 'Command Menu' Control — The home page includes some neat examples in a variety of styles. GitHub repo. Needs React 18+.

Paco Coursey

🔎 Node Modules Inspector — A tool that runs pnpm inside your browser, “installs” a package, then analyzes its dependencies. This can be useful for analyzing packages you already use, but also for simplifying your own projects, as 11ty’s Zach Leatherman did here.

Anthony Fu

PGlite: Run Postgres in WebAssembly — PGlite packages a WASM build of Postgres into a TypeScript library that can be run directly from Node.js (or Bun, Deno, and even the browser) and it’s only a few megabytes in size.

ElectricSQL / Neon