Effect 4.1 has been released!
New crypto modules, HttpApi improvements, and lots of other great additions and fixes.
Read more here: effect.website/blog/releases…
Enjoy!
@EffectTS_
We are going to be **so** productive.
The @EffectTS_ team has a cross-platform bot now. We're going to be so much more productive.
ALT The landing page of the Effect Website which says "Reliable TypeScript for the AI era" displayed with pink text.
Tim Smart retweeted
Huge thanks to all our sponsors for helping us bring the Effect community together in Italy this December. 🤍
We're so happy to have you on board!
@zivergetech @EffectfulTech @warpdotco @executorsh @academind_real @Cloudflare @novelcrafter
effect.website/effect-days#s…
ALT Effect Days 2026 banner featuring the event sponsors: Ziverge, Effectful, Warp, Datapizza, Betalyra, Inato, Cloudflare, Academind, Novelcrafter, Executor, and August.
Tim Smart retweeted
This week I cover at-least-once delivery, persisted messages, and the Two Generals’ Problem.
The Two Generals’ Problem is provably unsolvable, just like getting anyone to answer @thefubhy in our team chat.
Runners crash, but with Effect Cluster your messages don't need to go down with them.
This week, learn how to
→ Choose at-most-once or at-least-once delivery
→ Persist messages so they survive a crash
→ Reply only when the work is done
Module of the Week: Cluster, Part 3 ↓
ALT > A sender and a receiver joined by a line, with a lost message falling off the middle. The counters read 2 sent, 1 received.
Tim Smart retweeted
Module of the Week #4 is all about how cluster routes messages to the correct entity without a central coordinator.
I spent way too much time on the visuals for this week's post, but I think it might be the best one yet.
effect.website/blog/module-o…
Effect Cluster, Part 2 - Module of the Week #4
With no coordinator in charge, how does a message find its entity?
This week, we define our first entity and follow one message from webhook to punchline 👨
Questions? Office Hours tomorrow, link in 🧵
effect.website/blog/module-o…
Heard @EffectTS_ is pretty cool. Better try it now that 4.0 is out
Effect v4 is here.
One ecosystem. Zero dependencies.
The next chapter of Effect and the foundation for building reliable software and AI agents in TypeScript.
ALT Effect 4.0 stable release announcement on a dark background. Large white “4.0” above “Production-ready. Out now.” A timeline along the bottom progresses from 3.0 Stable to 4.0 RC to 4.0 Stable.
Tim Smart retweeted
Better late than never - this week's Module of the Week is all about RcMap, @EffectTS_ 's reference counted map module.
See you nerds at Office Hours tomorrow!
effect.website/blog/module-o…
This is now available in the latest @EffectTS_ RC release.
You can use @effect/ai-typesafe or the open router package to provide a DecisionModel implementation.
We have a New Zealand discord channel for @EffectTS_ now!
If interested, join here: discord.gg/VEZ5sxzkyg
- Yes I reviewed them all with my own eye balls
- But my clankers cleaned up all the slop first so they were in a better state before I looked at them (stats below)
- Most of them were only a couple line fixes so generally took less than a minute to understand the change
Huuuge thanks to @kitlangton and @anomalyco for unleashing Astra on Effect. 🫡
In just over two days:
204 PRs opened. 174 already merged.
Fixes across the runtime, platform, SQL, Schema, CLI, docs, and more!
In the next version of @EffectTS_ , there will be a 2x improvement in memory usage for the core apis. And a 20% improvement in minor GCs.
Effect v4 core package now has no external dependencies. Coming to an RC near you soon.
@EffectTS_
Tim Smart retweeted
Effect Days is back 🇮🇹
Join us on December 9–11 for three days with the people building Effect and the people building with it.
Workshops. Talks. Community.
Early Bird tickets are now live ↓
effect.website/effect-days
ALT Effect Days 2026 banner eaturing a large group photo of the Effect community.