Effect | TypeScript for the AI Era

A huge thank you 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! effect.website/effect-days#...

Effect Days 2026 is officially sold out! Thank you to everyone joining us, our speakers, and sponsors for making this possible. See you in December! 🇮🇹 ︀︀https://effect.website/effect-days

This Week in Effect #141 → Cluster idempotency in Module of the Week by Maxwell Brown → Native McpClient + major EventLog improvements in v4 → Effect Miami’s full speaker lineup announced: John De Goes Harry Solovay Devin Jameson Catch up on these and more ↓ effect.website/blog/this-we...

This Week in Effect #140 → Cluster delivery in Module of the Week by Maxwell Brown → Effect surpassed 50 million downloads per week → Warp is hiring top Effect engineers More below: effect.website/blog/this-we...

This Week in Effect #139 ︀︀→ Cluster messaging in Module of the Week by Maxwell Brown ︀︀→ Effect mentioned by @poteto ︀︀→ Effect Paris & Effect Warsaw meetups ︀︀ ︀︀More below: ︀︀ ︀︀https://effect.website/blog/this-week-in-effect/139

Effect Cluster, Part 1 | Module of the Week #3 by Maxwell Brown youtu.be/TB145FAQnDM

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 👨 effect.website/blog/module-...

RcMap | Module of the Week #2 youtu.be/Ia0wCjZ4gXQ

This Week in Effect #138 ︀︀→ Effect 4.0 Official Release ︀︀→ Cluster, Part 1 - Module of the Week 3 by Maxwell Brown ︀︀More below: ︀︀https://effect.website/blog/this-week-in-effect/138

San Francisco, we’re coming your way this Wednesday! 🌉 Join the Effect community at CodeRabbit's rooftop for an evening of Effect talks, a fireside chat, good food, and drinks. September 30 · 5:30–8:30 PM Save your spot: luma.com/all-things-e...

This Week in Effect #137 ︀︀→ RcMap - Module of the Week 2 by Maxwell Brown ︀︀→ Coach & Executive by MasterClass, built with Effect ︀︀→ Effect Paris 🇫🇷 meetup on Oct 13! ︀︀ ︀︀Blog post below: ︀︀https://effect.website/blog/this-week-in-effect/137

PersistedQueue | Module of the Week #1 by Maxwell Brown youtu.be/Fzmdn4wWGpU

This Week in Effect #136 → Module of the Week - PersistedQueue by Maxwell Brown → A new `DecisionModel` API to `effect/unstable/ai` by Tim Smart ︀︀→ Effect Warsaw Meetup by Kris Kaczo, Monika Zając, Daniel More below: effect.website/blog/this-we...

This Week in Effect #135 → ThePrimeagen getting started with Effect → The story of Astra vs The Boys by Michael Arnaldi → First Effect training workshop by Ziverge Blog post: effect.website/blog/this-we...

This Week in Effect #134 → Kit Langton unleashed Astra on Effect. → Dillon Mulroy will never again start another TypeScript app without Effect. → Matt Pocock praising Effect docs. More below: effect.website/blog/this-we...

Upcoming Effect events: Effect Office Hours 🔥: youtube.com/live/xKH8N0e... Effect Warsaw 🇵🇱: luma.com/29fn6spj Effect NYC 🗽: luma.com/2e0qaazh Effect San Francisco 🌉: luma.com/all-things-e...

Effect v4 RC: August 2026 Updates → Upcoming breaking changes → Zero external dependencies in core → Native PostgreSQL Client More below: www.effect.website/blog/effect-...

The Effect community is meeting on both US coasts this September: 🗽 NYC - Sep 24, 6:30 PM luma.com/2e0qaazh 🌉 SF - Sep 30, 5:30 PM luma.com/all-things-e... Come spend an evening talking all things Effect!

This Week in Effect #133 → Effect v4 core package now has no external dependencies → effect-mq: background jobs for Effect. By Adam Rankin → Effect Days early-bird tickets close on September 1st More below ⤵︎ www.effect.website/blog/this-we...

We can’t wait to see everyone at Effect Days this December 🤍 Early Bird tickets close on September 1st ↓ effect.website/effect-days

This Week in Effect #131 → Effect v4 Release Candidate is here! → Effect Days 2026 tickets are live! → A new Effect v3 → v4 migration skill! More below ⤵︎ www.effect.website/blog/this-we...

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 ↓ www.effect.website/effect-days

Modeling URI string protocols | Community Code Review www.youtube.com/watch?v=Gmqn...

Effect through the eyes of ZIO’s creator, John De Goes www.youtube.com/watch?v=NhbF...

This Week in Effect ︀︀ #130 John De Goes on Cause & Effect podcast Effect LSP rules now available as type-aware OXLint rules Satispay & Medblocks hiring Effect engineers More below ⤵︎ www.effect.website/blog/this-we...

Enjoy a special Cause & Effect episode with John De Goes, creator of ZIO and grandfather of Effect. www.youtube.com/watch?v=irmz...

Tomorrow: full Cause & Effect episode with John De Goes

Testing LLM workflows with Effect at OpenCode with Kit Langton & Johannes Schickling www.youtube.com/watch?v=EBSO...

Stop the agent slop with Effect by Maxwell Brown | Office Hours 32 🔥 www.youtube.com/watch?v=b8UL...

Effect v4 beta keeps moving. In July: a new Graph module, a Schedule overhaul, HttpApi hardening, migration tooling, v4 API docs, AI-related updates, etc. `main` is now Effect v4. Full recap ⤵︎ www.effect.website/blog/effect-...

This Week in Effect ︀︀ #129 Ziverge becomes the first Effect Adoption Partner and launches an Effect Training Workshop by John De Goes Why Effect v4 is built for AI-assisted coding - by Ben Davis Theo's first PR in Effect More below ⤵︎ www.effect.website/blog/this-we...

Effect is one of the most critical pieces of technology for building with agents at this point. -- Ben Davis ︀︀From errors as values to services, testing, and dependency injection, Ben Davis explains why Effect v4 feels built for the AI era. youtu.be/TXHQDOFW6Uc

This Week in Effect ︀︀ #128 Foldkit on the Cause & Effect podcast w/ Devin Jameson & Johannes Schickling New Effect website launched ✨ Datapizza hiring in Italy More below ⤵︎ www.effect.website/blog/this-we...

We shipped a brand-new Effect website. The docs are still for Effect v3 for now. This new website gives us the foundation to build a much better documentation experience for Effect v4, which we'll continue developing as we move toward the release. www.effect.website

Schema.struct vs Schema.class in V4 Schema.opaque vs Plain Struct schemas Effect Office Hours 31 🔥 www.youtube.com/watch?v=6mNN...

An Effect-First Frontend Framework: Foldkit Devin Jameson joined Johannes Schickling on Cause & Effect to talk about Foldkit’s schema-first approach to frontend state, how it differs from React, and why this architecture matters even more for AI-assisted coding. www.youtube.com/watch?v=MyKL...

This Week in Effect `effect-smol` is merged back into the main repo 👀 Skills for Production TypeScript with Effect v4 by Kit Langton Crosshatch by Harry Solovay More below ⤵︎ effect.website/blog/this-we...

Optics www.youtube.com/watch?v=49lI...

📣 Less than 10 days to the event! Sign up at luma.com/gr9wtmgs @stefvanwijchen.com will tell us about weft github.com/stefvw93/weft a reactive DOM library where every node is an Effect More coming up soon!

Effect Subtyping youtu.be/lzlm1SBLMng

This Week in Effect: An intro to Effect -- by Christian Alexander "Effect is better for humans too, not just agents" -- cit. Tim Smart A major Cron semantics fix in Effect v4 Beta More below: effect.website/blog/this-we...