Marvin Hagemeister

TS7.1 content mappers are actually pretty great, using them for css modules and graphql files jovidecroock.com/blog/typescr...

Interesting take: "Benchmakrs should never be longer than 300ms" matklad.github.io/2026/10/05/b...

I gave a talk at EMF titled "Men in Tech #YesAllMen", in which I told my experience of being a woman in tech. I was afraid to publish it in case it affected my current or future employment. With all the current news I would like to add my 2¢. So here is the recording: youtu.be/WXL6K1lhvt0?...

One minor feature of Preact 11 that we haven't talked about much is the strictly typed aria roles on HTML elements, where possible. In short, `<header role="form">` will now be a type error. Spent quite a bit of time going through the spec docs to build that out, doing our part to make the web more

Preact 11 is out 🎉 We’ve been hard at work at making our diffing use modern features like moveBefore , leveraging ESM for tree-shaking Preact Compat and ensuring you have a great experience with resumed hydration.

we have no choice but to give the preact team billions of dollars 😌

1. make it work 2. [object Object] 3. make it fas

🙋‍♂️ ever wanted to build something without needing to configure a db, auth, file storage or a cms? it turns out you already have all four if you have a bluesky account 👉 airspace is a typed client for it

I wrote about what I've been up to with my new programming language! Zena targets WebAssembly GC, with a TypeScript-like syntax, sound type system, and lots of cool features like pattern matching, async cancellation, borrow checking, WASI integration, and more! justinfagnani.com/2026/09/09/z...

New Things You Should Know About HTML Here in Mid 2026 The foundational language of the web is getting plenty of love lately! While HTML moves a bit more slowly than its buddies, CSS and JavaScript, that tends to be a good thing. I'm not gonna do, like, in here. That's too basic for you. Tha

Respected friends and acquaintances, initial-scale is dead! We are freed of its tyranny. You no longer need to include it in your HTML head. It is an obsolete part of your head's meta viewport declaration. The details: vale.rocks/micros/20260... #WebDev #HTML

This change by Noah Lev will probably save a zillion dollars in docs\.rs and CI jobs everywhere. Really nice work! noahlev.org/blog/2026/08...

Preact 11.0.0-rc.1 is here ⚛️ preact/compat code is now tree-shakeable, with representative single-export bundles shrinking by up to ~28%. Plus: more size wins, better HTML attribute types and maintenance fixes. This will most likely be the last rc - feedback is appreciated

The new content-mapper API in tsgo has just been merged and will be part of TS 7.1 It's what every framework dev has dreamed of for years. Really excited about this becoming a reality! github.com/microsoft/ty...

It's so great to see this sort of cross-pollination of ideas (and generous sharing of credit): the tsgo-based API exposes AST nodes to JS in a way that's inspired by @marvinh.dev's work on Deno's Rust-based linter.

So many good things are coming to TS 🙌

I like this approach of exposing hooks in a library and letting consumers decide which crypto crate to pick etc. Makes it very future proof and minimal. nickb.dev/blog/theres-...

Preact supports async hydration. Resumed hydration lets Suspense boundaries become interactive independently while code/data arrives. Why that helps the main thread, what Hydration 2.0 fixes, the remaining useId problem, and streaming: www.jovidecroock.com/blog/resumed...

This is a fantastic article on modern and efficient parser design: www.arshad.fyi/writings/eng...

I sometimes wonder how many "local" containerized services are accidentally exposed to the internet because of this. See also: docs.docker.com/engine/netwo...

I am once again exploring the modern take on this after 4 years: marvinh.dev/blog/running...

📣 The moment is here. 📣 TypeScript 7 is officially released! 7️⃣ devblogs.microsoft.com/typescript/a...

How to speed up vitest: De-barrel everything so that the module graph gets smaller. Saves both processing + import time. And get rid of module mocks, which prevents many de-barelling opportunities.

Every month I look at this TS issue and think of how much further frameworks would be if this would be addressed. github.com/microsoft/ty...

Really interesting approach to trying to make shared mutable borrowing safe in programming language design. I long for a simpler Rust so I'm always watching this space and excited about all the research happening there! verdagon.dev/blog/ante-bl...

I've been waiting for full bundle mode since the webpack days. Excited that it's becoming a thing now in vite!

Some great usage of prototypes in JS! tanstack.com/blog/tanstac...

What's this, a new HTML proposal? Built-in localized time formatting in HTML! github.com/whatwg/html/...

Babel 8! After all these years! What a surprise! babeljs.io/blog/2026/06...

Sometimes, HTML is all you need. I wish more sites were like that project described in the article.

A new way to explore your node modules folder: nesbitt.io/heap

I feel like it has become hard to follow actual discussions on PRs with so many integrations commenting. Not sure why GitHub hasn't given them a dedicated integration rather than everyone just using comments.

HTML might be getting out of order streaming natively in the future. I really like this: developer.chrome.com/blog/declara...

Mad respect for Jake here. As someone who is into endurance sports (cycling) a little, walking 100km is highly impressive. Takes a lot of mental strength and being very in tune with your body.

Instead of doing more, let’s do better.

Module mocking in test runners is the devil. Prevents so many performance opportunities.

Speeding up the JS ecosystem OXC edition 🚀 We made both oxfmt and oxlint 50% faster on projects with >50k directories. marvinh.dev/blog/speedin...

Are worktrees the new branches?

You only notice how bad npm's 2FA token reuse is once you transition 102 repositories to use provenance with GitHub environment gating... I had a 2FA code in my clipboard that worked for a solid minute

New post on supply chain security for npm packages — covering the publishing workflow I push in the projects I maintain, plus the consumer side: why pnpm is a better default than npm, its native minimumReleaseAge config, and trustPolicy: no-downgrade to catch provenance regressions automatically.

I think I might have enough material to look at for a second season of "speeding up the javascript ecosystem"

Golfing the byte size of application is so 2025, I've pivoted into golfing tokens github.com/oxc-project/...

A GitHub for maintainers - Giving dependencies the same treatment the fork got nesbitt.io/2026/05/02/a...

actively incentivising larger dependency graphs is bad for the ecosystem

TSRX now supports Vue Vapor! Plus we've extended the runtimes support to include Preact. We will soon have an MCP server for TSRX so you can plug it into your favorite AI agent. TSRX is still alpha, so we're looking for early feedback from the Vue community tsrx.dev/getting-star...

Such a good read on why "knowing things" still matters and tools won't catch everything. corrode.dev/blog/bugs-ru...

Been mentioning it here and there but officially launching pracht, a framework-y solution for preact! www.producthunt.com/products/pra...

I feel like that's the biggest issue in our industry and AI has just multiplied that tenfold. Software that improves people's lives is created with care. I feel like we're teaching a generation of developers that it's totally normal for stuff to be broken all the time. Not sure how to solve this.