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
- Effect 3.11 has been released!
Here are all the technical changes from this week (note that changes included in the 3.10 release will not be listed).
Effect Core
- Fix docs for Stream.partition (Documentation Update)
- Catch logger defects from calling .toJSON on data types (Feature)
- Add error handling to Inspectable.toJSON (Feature)
- Ensure pool.get is interrupted on shutdown (Bug Fix)
- Fix Stream.partitionEither example (Documentation Update)
- Ensure current time zone tag type is properly exported (Bug Fix)
- Align Micro jsdocs with latest implementation (Documentation Update)
- Micro adjustments (Refactor, Feature)
- Add the missing TypeScript fences to the recent examples. (Documentation Update)
- SchemaAST: fix TemplateLiteral model (Bug Fix)
- Fix the Schema.TemplateLiteral output type when the arguments include a branded type (Bug Fix)
- Feat: add runtime type extractor (Feature, next-minor)
- Fix the behavior of Schema.TemplateLiteralParser when the arguments include literals other than string literals (Bug Fix)
- Preserve MissingMessageAnnotations on property signature declarations when another field is a property signature transformation (Bug Fix)
- Fix TemplateLiteral and TemplateLiteralParser encoded type inference when the parameters include a union of string | number (Bug Fix)
- Update absurd function documentation (Documentation Update)
- Optimize cron (Optimization)
- Add non-traced overload to Effect.fn (Feature, next-minor)
- Add Schema.headNonEmpty on Schema.NonEmptyArray (Feature, next-minor)
Effect AI
Effect Experimental
- Avoid “Cannot access ‘ParentSpan’ before initialization” error during module initialization (Bug Fix)
Effect Opentelemetry
Effect Platform
Improve HttpApi handling of payload encoding types (Improvement)
Update OpenApi version to 3.1.0 (Improvement)
Add template literal api for defining HttpApiEndpoint path schema (Feature)
Allow creating a route for all methods (Feature)
Simplify HttpApiClient param regex (Optimization)
HttpApi OpenApi adjustments (Feature)
Ensure the uniqueness of the parameters at the type level (Feature)
Cause & Effect Podcast
Last week we launched our brand new podcast, Cause & Effect , hosted by Johannes Schickling!
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.
Cause & Effect is available on Youtube, X(Twitter), and audio platforms like Spotify and Apple Podcast.
Our first episode’s guest is Attila Večerek, Tech Lead & Staff Engineer, who discusses 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!
Effect Days Update
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 Sebastian Lorenz as a speaker. Sebastian is the CTO of Edge & Node, an Effect Core Contributor, and an Advisor at Effectful Technologies.
Community highlights
Orlein, professional educator and Effect community member, built a backend server using only Effect for his Frontend students to help beginners get started with Effect.
Dillon Mulroy live-streamed four episodes of his new 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)
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
- We have started publishing the talks from our latest Effect Meetup in San Francisco. The first one is ‘Learning Effect’ by Elliot Dauber, Founding Engineer at Markprompt. In this talk, he shared his experience with learning Effect while onboarding at a new job and its impact on their developer team.
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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