livestream reminder: the full technical deep dive on the Doom in #typescript types codebase is happening tomorrow at 1pm Eastern with Dillon Mulroy hosting. let us know if there's anything specific you'd like to have covered!

📮 What Flint Does Differently Flint is an experimental linter. It intentionally revisits many of the core design decisions from other popular web linters. Please enjoy this medium dive how Flint's intentionally deviating from other linters and trying new things. ❤️‍🔥 www.flint.fyi/blog/what-fl...

🥳 TypeSlayer is out! celebrate by posting what your type graph looks like! it legit has an actual leaderboard now: so bonus points if you win lol 🏆🏆 run: `npx typeslayer` source: github.com/dimitropoulo...

Carl and I had even more to discuss than usual! Lot of recap, deep dives into React2Shell and the impacts, and thoughts on what happened with the React ecosystem this year and where where it's headed next year.

Introducing Flint: a fast, friendly linter. Flint is an experimental linter made to validate several hypotheses: hybrid linting, streamlined rich configuration, thorough docs & plugins, and tooling coordination. Expect to hear more about Flint over the next month. ❤️‍🔥 www.flint.fyi/blog/introdu...

Finished two retrospective blog posts on the journey of require(esm) before 2025 ends: joyeecheung.github.io/blog/2025/12... joyeecheung.github.io/blog/2025/12...

Your TypeScript year in review You "silenced" 417 errors with `as any` that turned into runtime errors as soon as the code ran TypeScript printed 4,693 error messages. 26 of them made sense You spent 98 minutes waiting for tsc to run. During this time you spent 544 minutes reading social media

Facebook's Static Hermes is kind of incredible. It can compile JavaScript into C, which is then optimized into native machine code. I just compiled the Less.js source code into a C library. Then I called it from Rust as a native Parcel plugin (no Node). Wild. 👨‍🔬 devongovett.me/blog/static-...

Spent multiple hours yesterday and today debugging github.com/reduxjs/redu... , which "only repro'd in prod". Turns out: - Immer's ESBuild config minifies fields - The patch logic I'd ported has a `if ("key_" in state)` check - that fails when `key_` gets minified oops!

[content warning - bad ideas] PoC of import(CJS) working in the browser on top of dynamic import. No dependencies, under 300 lines of horrible abomination. github.com/naugtur/import-cjs-browser/ I apologize.

You know the phrases that basically mean "the site drove so much traffic that it took down your website"? There was "The Digg Effect", getting "Slashdotted", and these days, the Reddit "Hug of Death". What is it for Hackernews? I propose the "Umm Ackshually of Death".

Merry Christmas, folks...I feel genuinely grateful to spend time on social media talking about our food memories and other nonsense. It's a genuinely joyful experience for me to interact with all of you, and even call some of you friends. I appreciate all your support! Have a truly blessed holiday!

👀👀👀 github.com/reduxjs/reac...

Excited to report that @mweststrate.bsky.social has published Immer 11.1.0, with the new array methods override plugin! This is the last of my major perf PRs, and combined they boost Immer perf by 50-80% over 10.1! Release notes: github.com/immerjs/imme...

Just pushed significant updates to the React "concurrent stores" API that @capt.dev is working on: - PRs to improve TS types and add equality comparison support: github.com/thejustinwal... - Updated the React-Redux draft PR to use that: github.com/reduxjs/reac... All `useSelector` tests pass!

Love how the new website turned out!

You can expect this feature as early as your first pull request to make it happen!

❓"When can we expect this feature" Please refrain from asking this question towards open source maintainers. You generally shouldn't "expect" anything. I don't often agree with DHH but his take on OSS being a gift, not something you're entitled to, is something I relate with.

I have _entirely_ too many projects (Redux and otherwise) that I want to tackle over the holiday break :( oh well. can't do 'em all at once. pick a couple and see how far I can get.

we released the new @e18e.dev ESLint plugin today! 🎉 this comes with 3 categories of rules: modernisation, performance, replacements it also works with oxlint and most of the rules have auto-fixes 🛠️ try it out and let us know any feedback/rule suggestions in discord/bsky/github!

About to go live!

I want to thank @replay-io.bsky.social. I honestly don't know how I would have debugged an issue I had if not for their time travel debugger. Certain nodes would "stick" after hovering, and required very specific timing to reproduce.

We'll be going live in @reactiflux.com around 12:30 ET for December's "This Month in React" ( @tmir.reactiflux.com ), where Carl, Mo, and I will be breaking down the "React2Shell" RSC vulnerability - what happened, why, impact, and more. Also looking at the ecosystem and year in review. Join us!

cosign!

It should be way more normal to talk about this stuff. Thank you Corbin. Also, make sure to read the full series, playfulprogramming.com/collections/...

This was incredibly hard to write. I hope you'll take the time to read it. playfulprogramming.com/posts/psycho...

Don’t let A.I. read your .env files. I wrote a practical guide (and a cautionary tale) on how to avoid accidentally sending your api keys and other credentials to an LLM. filiphric.com/dont-let-ai-...

Most internal tools leave unused seats and unmet requests. Build what you need with Replay Builder—describe your needs and get a web app in minutes! Download the code, host it yourself, and keep moving! 🚀 builder.replay.io/

it's the time of the year when thoughts turn not just to how soon we can stop for the holidays but also what we'll be coming back to, which makes it a good time for me to take a look ahead at ECMAScript 2026 and all the features that we already know will become part of JavaScript then

Researchers have found two new vulnerabilities in React Server Components while attempting to exploit the patches last week. These are new issues, separate from the critical CVE last week. The patch for React2Shell remains effective for the Remote Code Execution exploit.

Someone please remind the folks at the top of GitHub and the owners at Microsoft that being the default code hosting platform is *earned* and *can be lost*. Getting the core value proposition right is *the job*.

⚔️introducing TypeSlayer⚔️ A #typescript type performance benchmarking and analysis tool. A summation of everything learned from the benchmarking required to make the Doom project happen. It's got MCP support, Perfetto, Speedscope, Treemap, duplicate package detection, and more.

I've heard folks express concern about React Router since the Remix 3 announcement Some variation of "is it on hold?"/"is it a secondary focus?"/"will it stop getting features?" etc No, No, and No 😀 To back it up, I thought I'd put together a little "React Router Wrapped" for 2025 🎄

This is where my day job time goes! Most of my work on this is far behind the scenes, but we've got some pretty awesome technology for analyzing React behavior to help the tool fix bugs as it's building an app. Try it out and let us know how the app generation works!

The browser has everything you need, why not everything needs to be server-rendered and how preloading can alleviate complexity. jovidecroock.com/blog/platform

new project launching tomorrow: 1. no, definitely wont be as cool as Doom (lol) 1. types-level-super-nerds will enjoy it - everyone else won't care 1. here's a screenshot (these are #typescript types)

Oh hey, 90s kids, The Even More Incredible Machine is free to play on the Internet Archive. archive.org/details/win3...

This is some truly excellent advice on purposeful conf attendance prep and planning from @bytesofbree.bsky.social !

wow. just realized that we shipped RTK 2.0 _2 years ago_ . man that was a crazy year of development :) (and since then: lots of additional features and fixes, tutorial rewrite, RTKQ infinite queries, Immer perf work... and the todo list still ain't getting shorter! 🤣 )

I guess this time the game really does stop, when the stream ends.

Announcing Oxlint Type-Aware Linting Alpha 🎁 Just a few months after our technical preview, type-aware linting reaches the alpha milestone! ✨ Type-aware rules can now be configured 🙈 Inline comments to disable rules work for type-aware rules too ✔ Auto fixes for type-aware rules are now available

Just published Redux Toolkit v2.11.1. This fixes a small `AbortSignal` issue, but more importantly switches our publishing workflow to NPM Trusted Publishing. We've also formally documented our TS support policy, and updated to support TS 5.4+: github.com/reduxjs/redu...

This is a new sort of post for me. Trust in OSS is a thing I care a lot about. This post is my attempt to frame AI slop PRs as an attack on trust in open source.

The changed code is a small fraction of an open source contribution. Your commitment to understand the issue, how your proposed solution fits with the project, and be ready to own and push the review process forward is the biggest chunk of the work. Your effort is the contribution, not the code.

The original React2shell PoC is now public. This is as bad as it gets – full RCE. You must upgrade now. There are mitigations in place in CDNs including Cloudflare, Netlify, Vercel and AWS (and sites on Workers aren't vulnerable to this sort of attack), but there are variants in the wild now.

x.com/panchito built a _really_ slick looking Github file viewer clone that fully uses RSCs and new React features, as well as making smart use of modern CSS. Great writeup on the implementation: wtbb.vercel.app I tried browsing the React repo example and it's _fast_! Really impressive!

There is critical vulnerability in React Server Components disclosed as CVE-2025-55182 that impacts React 19 and frameworks that use it. A fix has been published in React versions 19.0.1, 19.1.2, and 19.2.1. We recommend upgrading immediately. react.dev/blog/2025/12...

I cover Async @react.dev primitives like useTransition, useOptimistic, Suspense, and use() and how they simplify async coordination. React and its ecosystem are evolving for reliable async and a declarative DX. Loved writing this for @logrocket.bsky.social.

What a fantastic line-up. Can't wait to be there 🔥

Discover The full Conference Agenda of #ReactParis 2026 👉🏽 react.paris?id=0312