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:
- Effect is API stable with the Effect 3.0 release.
- Effect 3.11 has been released.
- The Effect community on Discord reached 3740+ members!
Technology
Here are all the technical changes from this week.
Effect Core
- Arbitrary: optimize date-based refinements (Enhancement)
- Effect module: add more jsdocs (Documentation Update)
- Support template literals in Schema.Config (Feature)
- Effect module: add more jsdocs (Documentation Update)
- Add support for TemplateLiteral parameters in TemplateLiteral (Bug Fix)
- Add Context.mergeAll (Feature, next-minor)
- Add DateTimeUtcFromDate schema (Feature, next-minor)
- Carry both call-site and definition site in Effect.fn, auto-trace to anon (Feature, next-minor)
- Fix Stream.scoped example (Documentation Update)
Effect AI
Effect Platform
- Ensure HttpApi preserves referential equality of error schemas (Bug Fix)
- Ensure HttpApi union schemas don’t transfer non-api related annotations (Bug Fix)
- Add HttpServerResponse.redirect api (Feature)
- Upgrade undici to 7.x and expose re-exports in Undici module (Feature)
- Ensure WebSocket’s are always closed with an explicit code (Bug Fix)
- Support URL objects in HttpServerResponse.redirect (Feature)
- Remove generics from HttpClient tag service (Bug Fix, next-minor)
Effect SQL
- Add @effect/sql-sqlite-do for cloudflare durable object sqlite (Feature)
- Add timeout to sql connection attempts (Bug Fix)
- Use Redacted values with libSQL (Feature)
General Chores
- Use PAT for release-queue jobs
- Use PAT for pr checkout
- Use Effect Bot as release-queue git user
- Use PAT for release-queue checkout
- Fix dtslint clean command
- Add concurrency cancel-in-progress to release-queue job
- Change release-queue git_user
- Remove release-queue concurrency
Effect Days 2025
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! 🎟️
This week, we announced Maxwell Brown as a conference speaker. Maxwell is an Effect Core Contributor and Founding Engineer at Effectful Technologies.
Effect merch store
The Effect Merch Store is here! Explore a selection of Effect-branded items, designed for the community. All orders are processed through Printful
Community highlights
Laure Retru-Chavastel, Full Stack Software Engineer at Inato, gave an introduction to Effect at an online event hosted by Frontend Queens, “Introduction to Effect - Next Generation TypeScript”. In this session, Laure covered some of the key features of the Effect library, such as error handling, data validation, and concurrency. The presentation will be available on YouTube in the next few days.
Antoine Coulon, Lead Software Engineer at evryg, will be talking about Effect at the Paris TypeScript Conference.
Tyson Chen shared two of his personal projects with the community:
effect-builderandeffect-line.effect-builderis a type-safe, immutable builder to construct complex objects with runtime validation while maintaining compile-time type safety.effect-lineis a collection of Effect-based libraries for working with LINE Platform APIs.Dillon Mulroy livestreamed three episodes of his series Integrating Stripe with Svelte 5 and EffectTS 🚀 on his Twitch channel.
Effect job opportunities
More and more companies are adopting Effect in their projects—here’s a list of exciting job opportunities that include Effect in their tech stack:
Superwall : Full-stack TS developer with backend & infrastructure experience.
Expand.ai : Software Engineer
Platonic Systems : Remote Effect Engineers
Inato : Senior Product Engineer
Medbill.ai : Founding Software Engineers (full-stack and backend)
inRev : Senior Software Engineer
Oneiro Solutions : Software Engineer - Core Team. Join our Discord and DM leighman for further info.
Disclaimer: Please note that these job postings are shared for informational purposes, and we encourage applicants to verify details directly with the hiring companies.
Effect content update
Maxwell Brown and Tim Smart were live on X(Twitter) and Twitch on Tuesday with a new episode of Reimagining ContentLayer with Effect.
The fifth episode of Building an Effect Warehouse App has already been published on the Effect YouTube Channel.
Cause & Effect Podcast
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, the learning process, the challenges faced, and the benefits of integrating Effect into their tech stack.
In our first episode, we were joined by Attila Večerek, Tech Lead & Staff Engineer, who discussed how Zendesk incrementally adopted Effect in a polyglot environment with a large codebase. Give it a listen and let us know what you think on our social media or Discord!
Closing notes
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
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