Fresh Reads

Cluster delivery in Module of the Week. Effect surpasses 50 million downloads per week. 🚀 Effect Miami scheduled for Nov 9.

We look at at-most-once and at-least-once delivery, then use persisted messages to stop Dad losing messages when a runner crashes.

Cluster messaging in Module of the Week. Released Effect 4.0.1 and 4.0.2.

Two patch releases, a round of fixes, and one gnarly mistake

It's time for a change in schedule and format. Short weekly writing is too shallow when you have AI. I am pivoting: longer, timeless, full technical overviews, once every few weeks.

We write our first entity, then follow one of its messages across a cluster to see how runners agree on who owns what.

Effect v4 is officially stable, merged live at the San Francisco meetup. 🚀 Exploring Effect Cluster in the Module of the Week series.

The final month of the RC cycle. A major runtime performance pass, systematic correctness sweeps, and the stable release of Effect 4.0.

Rebuilt from the ground up, with a dependency-free core and long-term support

The skill of writing code will become obsolete eventually, we are getting there faster and faster. And if writing code has not much value anymore, you need to shift your focus. Here is what I am doing.

The first in a series on Effect Cluster. We look at the actor model and how a cluster is laid out.

Module of the Week 2: RcMap. Effect v4 RC lands a major runtime performance pass across Schema, Queue, Stream, and Scope.

Discussions about code are getting less and less relevant. We reached a level above it: how to automate your entire pipeline. Here is how I am doing this.

Learn how RcMap uses reference counting to share scoped resources by key across consumers, with automatic cleanup, idle time to live, and capacity limits.

Module of the Week series by Maxwell Brown, PersistedQueue. Cloudflare, Effect & Alchemy recognised as the winning stack with AI agents by the community.

Learn how Effect's PersistedQueue handles background jobs, multiple workers, locking, and retries.

Iteration after iteration, the effect-machine API reached a more stable API. And, guess what, it looks really close to XState. Let's see an example then.

Module of the Week is a weekly blog post that explores the lesser-known parts of Effect, one module at a time.

Astra vs The Boys: 207 PRs, three days. The Primeagen dives into Effect. Ziverge runs their first Effect training workshop.

State machines in effect is a question of time. I am working from multiple angles to ensure this will come, soon, sooner. Here are the latest updates of what's happening.

One Queue bug, an unreasonable number of agents, and 207 pull requests in three days. A story about AI audit, human review, and a GitHub runner quota that gave up.

Kit from Anomaly unleashed Astra on Effect. Dillon will never again start another TypeScript app without Effect. Matt praising Effect docs. Effect NYC & Effect San Francisco September meetups.

Welcome to the new era of open source development with AI. You can move way faster, the scope can explode with ease, and you may find yourself prompting a lot. It's not easier.

Effect v4 Release Candidate announcement. Zero external dependencies in the core package. A native PostgreSQL client, pull-based Sockets, native Schema Arbitraries, and more.

Effect v4 RC's core package now has zero external dependencies, with a native PostgreSQL protocol client and reworked native Schema Arbitraries. Early Bird tickets for Effect Days close on September 1st.

If before writing was the most effective tool to organize ideas, now it has a competitor in AI. Yes, but they can also work together. And they work on different levels and situations.

Effect v4 RC lands new Match.fn selectors, RPC stream backpressure, and Schema reference policies. Foldkit ships server-side rendering. Effect gets a shoutout in this week's This Week in React newsletter.

If you write code, you want your API to be clean, concise, and beautiful. Less explicit, less verbose. Agents may be the opposite. Give them a full explicit API, and don't leave anything hidden.

Effect v4 Release Candidate is here! Effect Days 2026 🇮🇹 is back! A skill for Effect v3 to v4 Migration.

We think we are ready to ship. Now it's your turn.

Library development is changing as well with agents. The principles are the same as app code: as much linting, tests, and static checks as possible. With that in place, internals can move, fast.

John De Goes joins Cause & Effect Podcast #10 to talk AI, Effect primitives, and teaching Effect in the age of AI. Effect LSP rules now available as type-aware OXLint rules.

The new @typeonce/effect-machine library is out, and it brings state machines and state charts into effect. Composable and fully type safe, just like effect. Let me give you an introduction.

Native Deno support, a Graph module, Schedule overhaul, HttpApi hardening, a landmark repository migration, and more.

Ziverge becomes the first official Effect Adoption Partner. Talks from Effect Miami 2 on Effective State Machines, NestJS migration, and agentic runtimes.

It wasn't even a year ago when most devs stopped writing the code. The first revolution. We are now entering the second phase of AI coding: stop reading your code as well. Let me show you how.

Foldkit on the Cause & Effect podcast. We rebuilt and redesigned the Effect website.

AI model releases and trends seems to be speeding up even more than before. But you don't need to follow all the details. Here is what I am focusing on to keep up with AI without being overwhelmed.

effect-smol merged into the main repo! Kit Langton's skills for Effect v4. Crosshatch, an Effect-native x402 Clients & Merchants, by Harry Solovay.

With AI, you can do more than ever before. Bigger tasks in parallel. And not only in code. But more does not necessarily means more hours, that's a trap.