Effect | TypeScript for the AI Era

Effect 4.0 → →

[Effect | TypeScript for the AI Era @EffectTS_]

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 ↓

https://t.co/tsHyMP5wMa

[Gabriella Garcia @reallygabriella]

We bet on Effect early on and its been one of our best infrastructure decisions as Warp has scaled

Therefore, approving our sponsorship was one of my easiest finance decisions yet!

Catch @rankintweets our CTO headlining Effect Days in December

[Adam Rankin @rankintweets]

Effect is one of the best things that has happened to our tech stack at Warp. Sponsoring this was the easiest decision ever

[joel ⛈️ @joelhooks]

i was wrong about effect

when @schickling bent my ear for an hour at next conf (rip) 2 years ago i told him it would never happen

impossible nobody has time for all that because

@EffectTS_ is a lifestyle choice,
developers resist change,
it's too much surface area and vocabulary

all true, for humans, but the calculus totally changes with agents and effect's extremely robust nature isn't cognitive load for my smooth ass brain

now being all in, accepting the lifestyle choice, and building modular bullet proof apps can be your default

love this for us

[Effect | TypeScript for the AI Era @EffectTS_]

@joelhooks @schickling

[Effect | TypeScript for the AI Era @EffectTS_]

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

https://t.co/H6p8enAFYZ

[Dobroslav Radosavljevič @dobroslav_dev]

More code should be written in @EffectTS_

The world would be a better place

[Engin Diri @_ediri]

If you like to work with Effect and a powerful IaC tool and ecosystem by Pulumi, try @pierskarsenbarg effect-pulumi project!

https://t.co/6Lb2Cr9EMh

[Maxwell Brown @maxwellbrown]

TS 7.1 content mappers are going to open a whole new world of possibilities for Effect

[Dan van der Merwe @danieljvdm]

@maxwellbrown at cloudflare connect! effect cluster on DOs!

[Miguel @miguelcabs]

@maxwellbrown spreading the good word of @EffectTS_

[Effect | TypeScript for the AI Era @EffectTS_]

@ariazou @devinjameson @foldkit 🚀🚀

[Effect | TypeScript for the AI Era @EffectTS_]

Read the full post by @maxwellbrown here:

https://t.co/rQf5VNqcDu

[Effect | TypeScript for the AI Era @EffectTS_]

At-least-once delivery means you never lose a message, but you'll sometimes get the same one twice.

This week learn how to:
→ Make handlers idempotent
→ Skip duplicate messages
→ Deal with the dual write problem

Module of the Week: Cluster, Part 4 ↓

[Ariel @ariazou]

🚀 Excited to welcome 𝗗𝗲𝘃𝗶𝗻 𝗝𝗮𝗺𝗲𝘀𝗼𝗻 (@devinjameson) to 𝗘𝗳𝗳𝗲𝗰𝘁 𝗠𝗶𝗮𝗺𝗶 #𝟯!

Devin is the creator of @foldkit, an ambitious open-source frontend framework built on Effect and inspired by The Elm Architecture.

Foldkit rethinks frontend development around explicit state, predictable transitions, and composable effects. What makes it especially exciting is its approach to AI-native development: DevTools and MCP integration that let agents inspect application state, trace events, and even rewind the UI.

With a background spanning product design and engineering, Devin brings a fascinating perspective on how we can build better software for both humans and AI agents.

It’s a real pleasure to welcome him to our Miami developer community!

🔗 https://t.co/DSxuswYLXw

📅 November 9, 2026

📍 The LAB Miami, Wynwood

🎟️ RSVP: https://t.co/ENoCvVDmUn

#EffectMiami #EffectTS #TypeScript #AI #Foldkit #FunctionalProgramming

[Effect | TypeScript for the AI Era @EffectTS_]

Should we increase the 100 ticket limit for next year?

Effect Days 2026 is almost sold out! 👀

[Effect | TypeScript for the AI Era @EffectTS_]

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 ↓

https://t.co/tsHyMP5wMa

[Effect | TypeScript for the AI Era @EffectTS_]

@thefubhy @rankintweets @MichaelArnaldi @kitlangton @MichaelArnaldi

[Sebastian Lorenz @thefubhy]

At this point, I want this ... nay, I *demand* this to happen live on stage at Effect Days. ./cc @rankintweets @MichaelArnaldi

@kitlangton is this allowed?

[Effect | TypeScript for the AI Era @EffectTS_]

@ariazou @harrysolovay 🔥

[Ariel @ariazou]

🚀 Excited to welcome 𝗛𝗮𝗿𝗿𝘆 𝗦𝗼𝗹𝗼𝘃𝗮𝘆 (@harrysolovay) to 𝗘𝗳𝗳𝗲𝗰𝘁 𝗠𝗶𝗮𝗺𝗶 #𝟯!

I first discovered Harry through his incredible hardcore TypeScript tutorials on YouTube. His depth of knowledge, creativity, and ability to push the boundaries of the type system immediately stood out.

🎥 https://t.co/HobiO0052c

Harry is now building @crosshatchdev, an Effect-native toolkit for x402 payments, enabling applications and AI agents to seamlessly pay for and monetize APIs through programmable micropayments. Alongside projects like Liminal, his work continues to push the boundaries of what’s possible with TypeScript and Effect.

It’s a real privilege to have him share his ideas with the Miami developer community!

📅 November 9, 2026

📍 The LAB Miami, Wynwood

🎟️ RSVP: https://t.co/ENoCvVDmUn

@EffectTS_
#EffectMiami #EffectTS #TypeScript #AI #FunctionalProgramming #Crosshatch

[stevoland @stevoland1]

@alexdotjs @EffectTS_ I am finding that anything in effect is just by default better than anything else. Agent just falls into a pit of success