🚀 Exciting news! I’m launching a new blog series on Effective Pragmatism - the same topic I’ll be speaking about at Effect Days in just 2 weeks. I’ll be publishing a new post every 2-3 weeks, exploring the topic of software quality. Stay tuned! dev.to/attila_vecerek…
This Week in Effect - 2025-03-07
Hi Effecters!
Welcome back to This Week In Effect (TWIE) - your weekly update of the latest developments in the Effect community and ecosystem.
Effect is a powerful TypeScript library that helps developers create complex, synchronous, and asynchronous programs. One key feature that sets Effect apart is how it leverages structured concurrency to provide features such as async cancellation and safe resource management, making it easier to build robust, scalable, and efficient programs.
To get started, below you’ll find links to our documentation as well as our guide for installing Effect. Enjoy!
Recent major updates:
- The Effect Days conference is returning this March 2025! 🎉
- The Effect community on Discord reached 3850+ members!
- Effect 3.13 has been released.
Here are all the technical changes from this week.
- Schema: Export MakeOptions (Bug Fix)
- Match.tag + Match.withReturnType can use literals without as const (Improvement)
- Preserve branded primitive types in DeepMutable transformation (Bug Fix)
- Schema: add support for Transformation + Struct in extend (Bug Fix)
- Arbitrary: make called on Schema.Class now respects property annotations (Bug Fix)
- Disallow excess properties for various function options (Bug Fix)
- ConfigProvider: fromEnv: add missing Partial modifier (Bug Fix)
- Add additionalPropertiesStrategy option to OpenApi.fromApi (Improvement)
- Allow defects to pass through checks in AiPlan (Bug Fix)
- Ensure AiPlan builder returns the correct shape (Bug Fix)
- Avoid inclusion of _tag in tool call parameters (Bug Fix)
- Fix w3c traceparent header parsing (Bug Fix)
- Disallow excess properties for various function options (Bug Fix)
- Fetch http client merge headers (Bug Fix)
- Bug fix: change interruptible order in platform shutdown flow (Bug Fix)
- Add additionalPropertiesStrategy option to OpenApi.fromApi (Improvement)
- Update platform README to link runMain docs to website (Documentation Update)
- Refactor NodeStream.toReadable (Refactor)
- Add additional properties options to HttpApiBuilder.middlewareOpenApi (Features)
- Ensure empty Chunk’s don’t cause NodeStream.toReadable to hang (Bug Fix)
- Expose ParseError in HttpApiClient (Improvement)
- Update README.md (Documentation Update)
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Attila Večerek, Senior Staff Engineer at Zendesk and speaker at the Effect Days 2025, launched a new blog series on Effective Pragmatism exploring the topic of software quality.
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Michael Fester, founder of Markprompt, wrote about how they leverage Effect Schema and OpenAPI to create beautiful, interactive API documentation with zero maintenance overhead.
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Inalegwu Ikwue developed Comic-Pulse, a simple app to keep people informed about their favorite comic books releases. The app uses Effect in the backend.
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Milad Vafaeifard created effect-llm-test, a simple Todo app service with Effect and the LLM.txt provided.
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Dillon Mulroy live-streamed four episodes of his series Freelance project with TypeScript, Svelte 5, and EffectTS 🚀 on his Twitch channel.
The Effect Days conference is happening on March 19-21, 2025, and it’s the perfect chance to connect with the Effect community and celebrate the Effect ecosystem in person! Get your ticket! 🎟️
Effect Days is returning this March 2025, set in a beautiful seaside location in Tuscany, Italy! 🇮🇹 Join us for insightful talks, delicious food, and beautiful coastal views. Grab your ticket now! 🎟️ effect.website/events/effect-…
Workshop tickets are officially sold out, but a few spots remain for the main Conference & Community Days!
The workshop at Effect Days is officially SOLD OUT! 🎉 A huge thank you to everyone who grabbed a spot! If you missed out, don’t worry—there are still tickets available for the main conference! 🎟️ Get yours now: effect.website/events/effect-…
Here’s a sneak peek of Effect Days’ program and Conference talks:
What’s happening at Effect Days? ▸March 19 – Workshop with the Effect team. ▸March 20 – Talks on AI, DevTools & real-world use cases from MasterClass, Vercel, Zendesk & more! ▸March 21 – Roundtables, networking & a chess simul ♙♝ 🎟️Join us: effect.website/events/effect-…
A glimpse at what’s coming to Effect Days: ◆ AI Agents ◆ Error Management & Testing ◆ Effect Cluster & Fibers ◆ Next-Gen DevTools ◆ Rebuilding Redis for great Effect and much more! 🎟️ Get your ticket now: effect.website/events/effect-…
This week, we announced Michael Arnaldi as a conference speaker. Michael is the creator of Effect and founder of Effectful Technologies and will be giving the closing remarks with insights on the current state of Effect and what’s next for the ecosystem.
Michael Arnaldi @MichaelArnaldi, creator of Effect and founder of @EffectfulTech, will close the conference with insights on the current state of Effect and what’s next for the ecosystem. 🎟️Join Effect Days: effect.website/events/effect-…
Shout out to our conference sponsors, Inato, Evryg, and Effectful.
Inato is a global clinical trial marketplace that brings research to patients where they live. The Inato team is a long-time supporter of Effect and actively advocates for it within the developer community.
We're excited to have @inatohealth as a sponsor of Effect Days 2025! Inato is transforming clinical research by creating a global clinical trial platform that brings research to patients where they live. 🎟️ Book your ticket & join us this March in Italy! effect.website/events/effect-…
Evryg is a Paris-based software consulting firm specializing in Effect. The Evryg team leverages deep expertise in Effect to deliver innovative software solutions for clients.
Excited to announce @EvrygDotCom as a sponsor for our Effect Days conference again this year!🚀 A Paris-based software consulting firm with Effect expertise, evryg continues to support & empower the Effect community! 🎟️🎟️Get your conference tickets: effect.website/events/effect-…
Effectful Technologies. founded by the creators of Effect!
We're happy to announce Effectful @EffectfulTech –founded by the creators of Effect – as the main sponsor of Effect Days 2025! Join us in March in Italy 🇮🇹 to meet the team behind Effect and be part of the conversations shaping its future! 🎟️ effect.website/events/effect-…
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Maxwell Brown and Tim Smart were live on X(Twitter) and Twitch on Tuesday with a new episode of Reimagining ContentLayer with Effect.
Re-Imagining Contentlayer with Effect x.com/i/broadcasts/1…
Don’t forget to listen to our Cause & Effect podcast hosted by Johannes Schickling, and available on Youtube, X(Twitter), and audio platforms like Spotify and Apple Podcast. This podcast highlights stories from software engineers and companies using Effect in production. Each episode explores their journey of adopting Effect, including the learning process, challenges faced, and benefits of integrating Effect into their tech stack.
We’re excited to present our second episode with Michael Fester from Markprompt about scaling AI-powered customer support with Effect, building reliable and high-performance infrastructure, and enhancing developer productivity in a fast-evolving AI landscape. Give it a listen and let us know what you think on our social media or Discord!
In December 2024, we unveiled the Effect Merch Store, with a selection of Effect-branded items designed for the community. All orders are processed through Printful.
Effect Merch is here! We’re excited to announce the launch of our Effect merch page! Grab your favorite swag & show your love for Effect in style! 🧢 effect.website/merch
More and more companies are adopting Effect in their projects — here’s a list of companies looking for software engineers with Effect experience:
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Superwall: Full-stack TS developer with backend & infrastructure experience.
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Expand.ai: Founding Engineer
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Platonic Systems: Remote Effect Engineers
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Inato: Senior Product Engineer
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Medbill.ai: Founding Software Engineers (full-stack and backend)
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Oneiro Solutions: Software Engineer - Core Team. Join our Discord and DM leighman for further info.
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Microsub: TS Developer
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Samsung Food: Full Stack Developer
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Stealth team looking for an Engineer with experience in Effect. The job posting is available in the
#job-boardchannel on our Discord.
Disclaimer: Please note that these job postings are shared for informational purposes, and we encourage applicants to verify details directly with the hiring companies.
That’s all for this week. Thank you for being a vital part of our community. Your feedback is highly valued as we fine-tune this format. Feel free to share your thoughts, and we’ll do our best to tailor it to the needs of our community.
Effect Community Team