Delegates of TC39 in Google's Chelsea Market office
ECMAScript excitement 😉
This week in NY @tc39.es advanced these proposals 🎉
4⃣ Intl Era/Month Code
4⃣ Temporal
3⃣ Import Text
2⃣.7⃣ Error Stack Accessor
2⃣.7⃣ Iterator Includes
2⃣ Intl Unit Protocol
2⃣ Thenable Curtailment
1⃣ Error Code Property
🗑️ Dynamic Import Host Adjustment
Great discussions again this month! We looked at the release of Vinext and what that means, and has a pretty long sidebar on how AI tooling is affecting the industry
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!
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.
A great technical analysis github.com/ejpir/CVE-20...
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...
Não tem jeito, toda vez que ouço o @tmir.reactiflux.com saio completamente HYPADO
TMiR 2025-10: Post-conf; React 19.2, React Foundation, React Native removing old architecture. Next.js has too many directives
New Era for React = Stronger JavaScript Ecosystem 💙
React doesn’t live in isolation - It works alongside Node.js, Electron, webpack, and more. A dedicated foundation under the Linux Foundation means more collaboration, security, and sustainability across the ecosystem.
hubs.la/Q03MylxX0
How to enable Hermes v1: reactnative.dev/blog/2025/10...
Building off "static Hermes", avg improvement of 60% over current Hermes. Tested in the wild with Expensify, on high- and low-end devices
Hermes v1!
New architecture shipped as default 1 year ago, October 2024. Stopped supporting old architecture in May 2025. Today, from 0.82, they're removing the old architecture completely!
"new architecture started in 2018" when's the last time you shipped something you worked on for > 5 years
Aha: DevTools are 0.83, planned for later this year. With the recent release cadence, I tend to believe them. DOM APIs are still pretty big, if they dropped all of this today at once I'd be a bit shocked
Y'all this is not a drill, there is a network panel!!! Genuine web parity tbh
"investing in performance" yada yada. Traces and flamegraphs are massive tho
Talk about DevTools. Perf panel!!!
This is the real keynote tbh. This is officially React Native Conf
Web performance APIs too???
New docs! reactnative.dev/docs/element...
Web APIs new in 0.82???
"React Native is moving from being inspired by the web, to being aligned with it"
