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Effect Documentation

This Week in Effect - 2026-01-02

Davide Scognamiglio
Davide Scognamiglio
Project Manager
 Mirela Prifti
Mirela Prifti
Community Manager
 Michael Arnaldi
Michael Arnaldi
BDFL

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 build 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:

 

Technology

Here are all the technical changes from the past week.

Effect AI

Effect Platform

 

Happy New Year from the Effect Team

Happy New Year! ✨ As we step into 2026, here’s a quick look back at what shaped Effect in 2025.

We gathered at Effect Days in Italy, hosted community meetups across Europe and the US, and shipped major releases including the Effect AI SDK, Effect LSP, and early access to @effect/workflow. The team grew with Mattia Manzati and Kit Langton, and new learning resources like Visual Effect and Effect Solutions launched.

Adoption continued across production systems at OpenRouter, Warp, Polar, Salesforce DevTools, Vercel Domains, and within the 𝕏 (Twitter) codebase, among others. We shared progress through podcast episodes and live coding, and closed the year with a community gift from terminal.shop that we’re very grateful for.

For a deeper dive into what happened in 2025, check out our year-in-review blog post.

Here’s to building even more in 2026!

The Effect Team

 

Community Highlights

 

 

 

  • effect-web-midi - An Effect wrapper for the Web MIDI API that simplifies working with MIDI devices in web applications, featuring typed error handling and Effect streams for real-time MIDI event processing. Project by nikelborm.

 

  • effect-streamdown-terminal - A streaming markdown renderer for modern terminals built with Effect-TS, allowing content to appear incrementally as it’s received. Project by sogoiii.

 

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.

We’ve published our seventh episode with Adam Rankin, CTO at Warp, who joined Johannes Schickling to talk about using Effect to bring structure and composability to a growing TypeScript codebase, enabling a small, fast-moving team to stay productive while shipping reliable payment & payroll systems.

Play

 

Effect Job Opportunities

More and more companies are adopting Effect in their projects. Here’s a list of companies looking for software engineers with Effect experience:

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 Merch Store

The Effect Merch Store offers a selection of Effect-branded items designed for the community. All orders are processed and fully managed 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

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