TypeScript 7 Is Here: The Compiler Got Rewritten in Go
TypeScript 7.0 ships the compiler rewritten in Go: 8 to 12x faster builds, the same type system, and a new LSP tooling story. Here's what changed.
- typescript
- javascript
- webdev
- programming
Dennis Morello
Lead Frontend Engineer · Milan, Italy
I'm Dennis Morello, a Lead Frontend Engineer based in Milan, Italy, with over a decade of experience building clean, accessible web interfaces. I care about the details that make software feel right: performance, keyboard support, and interfaces that hold up for everyone using them.
Most of my work lives on the web platform. I write about frontend engineering here, ship open-source tools when I hit a gap worth filling, and rebuilt this very site with Astro and Tailwind CSS.
What I work on
Day to day that means TypeScript, React, and increasingly Astro, with a long-running interest in web accessibility. I like the low-level corners of the platform too, the kind of thing I end up writing about here, whether that's the new HTTP QUERY method or TypeScript's rewrite in Go.
Things I've built
Defrag98, a browser simulator of the Windows 98 disk defragmenter, is the one that reached the most people: it landed on Hacker News and The Verge in 2024. I later rebuilt it from scratch for a more faithful simulation.
I maintain React Awesome Reveal, an animation library for React, and Arbor, a CLI that makes git worktrees pleasant to use. A couple of smaller things round out the list: a Markdown-for-AI Chrome extension and a compound-interest simulator.
Talks
I gave a live-coding talk, Writing Accessible Components, building an accessible accordion in React from scratch.
Writing
All postsThe New HTTP QUERY Method
HTTP finally has a safe, idempotent, cacheable method that carries a body. Here's what QUERY (RFC 10008) is, why it exists, and how to use it.
- http
- webdev
- api
- backend
SolidJS 2.0: A React Developer's First Look at Signals and Async
SolidJS 2.0 lands first-class async, a new Loading boundary, and signals. Here's what caught my eye after years of writing React.
- solidjs
- react
- javascript
- webdev
Get in touch
The best way to reach me is by email or on X. The footer has the rest of my links.