Software engineeer · @EffectTS_ enthusiast · EDM composer
Italy
Joined June 2010
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Federico Biccheddu retweeted
16 new rules for the @EffectTS_ LSP last week, also in tsrs and Oxlint.
They focus on spotting Effect boilerplate and rewriting it to the builtin: mapBoth, fromResult, catchNoSuchElement, failSync, isSuccess, etc…
And they come with quickfixes as well!
Federico Biccheddu retweeted
Last weekend I moved Maple off React and onto @foldkit
100+ pages, 300k+ lines of React. Took me a few hours planning and building a validation harness, then 3 days with Claude to run the rewrite. The result is a 1:1 clone down to every. interaction and animation, with renders ~10% faster on average
It's been in production for a week and nobody noticed the switch
If you spend the time on a good validation harness, you can rewrite almost anything now
Wrote a bit more about why here: maple.dev/blog/react-to-fold…
Federico Biccheddu retweeted
build agents as state machines
agents are messy ~ loops with nested loops and side effects
everything can be modelled as a state or an event
and you can store the session (history of states and events) as a log
We just released support for `llms.txt` in Effect's website. At the moment we support only v4 docs.
More content is coming soon and will be added as soon it gets released!
effect.website/llms-full.txt
Point your agents to and feel free to share your feedback!
Federico Biccheddu retweeted
Building with the CAFE stack for a while - come chill with me, @devinjameson, and @samgoodwin89
twitch.tv/minbadblue
Federico Biccheddu 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…
Federico Biccheddu retweeted
Wanted to share a few thoughts regarding the Effect part of this discussion, starting with saying that I do broadly agree with everything that was said and that's exactly why I'd like to add some "maintainer" perspective on the choices.
Welcome to our Monday Meditations! 🌞
Today @badlogicgames and @mitsuhiko are talking why we built Pi Durable, a harness build around a small task-based workflow engine so long-running, multiplayer agents can suspend and resume anywhere. Also: why not Temporal or Effect.ts.
Federico Biccheddu retweeted
We rebuilt the Effect v4 runtime from the ground up.
In our benchmarks against v3:
→ 5× smaller bundle
→ 6.4× concurrent task throughput
→ 86% less memory per fiber
ALT Benchmark chart comparing Effect 3 and Effect 4. Effect 4 has a 5× smaller minimal bundle (7.1 kB versus 35.6 kB), 6.4× higher concurrent task throughput (4.57 million versus 0.71 million tasks per second), and 86% less memory per fiber (21.8 MB versus 157.5 MB of heap for 50,000 fibers).
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.
Federico Biccheddu retweeted
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.
Federico Biccheddu retweeted
Cloudflare + Alchemy (@alchemy_run) + Effect (@EffectTS_ ) is such a winning stack with AI agents, it's not even real.
Provides pretty much all the primitives you need for building any kind of application and ensures proper guardrails & rules to keep the agent on track.
And all the infra lives in code - which is how it should be with AI agents.
Federico Biccheddu retweeted
Excited to have @samgoodwin89, founder of @alchemy_run, joining us as a speaker at the Effect NYC meetup!
Sign up below:
luma.com/2e0qaazh
Federico Biccheddu retweeted
I am getting on the effect train.
Being able to track what errors can happen and if they are all handled is something that I am sure you can eventually get an LLM to do, or you can do it in less than a second and it's 100% reproducible.
Federico Biccheddu retweeted
More goodies coming from the @zivergetech workshop on @EffectTS_ that's happening TOMORROW. 👀
Going to have laminated guides ready to hand out at Effect Days 2026. 🚀
Hey @paolino, been using Fastpotify daily!
Feedback: filter, even locally, playlists when using "Add to playlist".
It's extremely annoying to look for a specific playlist.
- is not clear how are they ordered
- there is no visual feebdack
- no folder (IIRC coz Web API limit)
Federico Biccheddu retweeted
Update to Effect V4 if you haven't yet!!
Did a big sweep over the weekend finally migrating our @superwall monorepo to @EffectTS_ V4.
400k LOC PR later our services are now ~30% faster and use quite a lot less memory.
Federico Biccheddu retweeted
This Week in Effect #134
→ @kitlangton unleashed Astra on Effect.
→ @dillon_mulroy will never again start another TypeScript app without Effect.
→ @mattpocockuk praising Effect docs.
More below:
effect.website/blog/this-wee…
ALT A post by Matt Pocock saying, “It used to be ‘use TS, not JS.’ Now, for backend, it’s ‘use Effect, not just TS.’ Took a long time for me to drop my scepticism but I 100% agree with Dillon.” The post quotes Dillon saying he won’t start another TypeScript app or project without Effect, citing adoption, benefits for agents, and Cloudflare support.
I'm really excited about all the libraries/DSLs around @EffectTS_. They all:
- abstract away a lot of complexity/boilerplate
- have close/coherent and higher DX standards
- compose natively with Effect itself
- solve previously ignored problems due to accidental complexity
Federico Biccheddu retweeted
Experimental compiler for Effect Schema (one opt-in import, no API changes)
github.com/Effect-TS/effect/…
teapaw.org/GiulioCanti/status/209…
Should we bring a similar compiler to Effect Schema? 👀
teapaw.org/colinhacks/status/2093…
Federico Biccheddu retweeted
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.
Federico Biccheddu retweeted
I looked at @EffectTS_ for the first time today and I think it works very well with @solid_js 2.0.
We naturally absorb async iterators, and our actions already are as well.
What do you think?
stackblitz.com/edit/github-e…
