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!

• Effect Documentation
• Installing Effect

Recent major updates:

• The Effect Days conference is returning this March 2025! 🎉
• The Effect community on Discord reached 3740+ members!
• Effect 3.12 has been released.

Technology

Here are all the technical changes from this week.

Effect Core

• Add missing internal tag (Bug Fix)
• Incorrect type declaration in LibsqlClient.layer (Bug Fix)
• Remove internal EffectError make sure errors are raised with Effect.fail in Effect.try (Bug Fix)
• Effect module: more jsdocs (Documentation Update)
• Simplify OptionFromNonEmptyTrimmedString implementation (Optimization)
• Update internal namespace import convention from ’_ name’ to ‘name _’ (Refactor)
• Effect jsdocs: minor adjustments to interruption APIs (Documentation Update)
• Logger: eliminate duplicate code in stringLogger and logFmtLogger implementations (Refactor)

Effect SQL

• Fix(docs): sql insert resolver (Documentation Update)

General Chore

• Update docgen to latest

Community highlights

• Tylor Steinberger had a productive holiday and built some useful tools for the community:

• Ray made a new debug panel to view the Effect Metric, Worker, Sqlite WASM related data. Code available here: effect-metrics-view.

Happy New Year ❤️ make a new debug panel to view the Effect Metric, Worker, Sqlite WASM related data to welcome the new year's work. It's ridiculously beautiful. @EffectTS_
(https://twitter.com/xesrevinu/status/1875067265290494154)

• Dillon Mulroy livestreamed three episodes of his series Integrating Stripe with Svelte 5 and EffectTS 🚀 on his Twitch channel.

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! 🎟️

Shout out to one of our sponsors, Inato, 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.

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

• We published a new talk from our latest Effect Meetup in San Francisco, Autonomous Software – Building Agentic Workflows with Effect by Maxwell Brown.

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!

Effect Merch Store

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.

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