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This Week in Effect - #42

Ethan Niser joins Effect Days 2025 as a speaker. Technical updates, and more from the Effect ecosystem.

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 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:

Technology

Here are all the technical changes from this week.

Effect Core

Effect CLI

Effect Platform

Effect SQL

Community highlights

  • We’re excited to introduce Ethan Niser as a speaker at Effect Days 2025! Ethan is an advocate, educator, and content creator for Effect!

  • expand.ai is hiring! If you’re interested in working in an Effect-heavy environment, this could be the right opportunity for you.

  • Maxwell Brown delved into data serialization with Effect, showing examples of how Effect Schema provides safeness, reversibility, and predictability over JSON.stringify.

    Maxwell Brown
    Maxwell Brown
    @imax153
    · Follow

    🚨Stop gambling with JSON.stringify! Data serialization should be safe, reversible, and predictable ✅ With @EffectTS_ Schema, you define a schema for your data structure and get round-trip consistency out of the box 🚀 Code: effect.website/play#1c47c380c…

    A code snippet demonstrating the declaration and usage of an Effect Schema for a JSON-serializable JavaScript Set of numbers.
    Maxwell Brown
    Maxwell Brown
    @imax153

    Recently had a friend tell me that @EffectTS_ schema's serialization functionality was pointless since we can just use JSON.stringify 🤔 But is JSON.stringify truly safe to use for serialization? Let's take a quick look - what do you think happens here? 👇

    A single line of code which calls JSON.stringify on a non-empty JavaScript set which includes the numbers 1, 2, and 3.
    74
    Reply
    Read 1 reply

  • Michael Arnaldi, the author of Effect, joined the latest Code & Talk episodea tech podcast dedicated to the French tech community, to discuss Effect.

  • Jonah Henriksson released solid-effect, a library for using Effect in SolidJS.

  • Dillon Mulroy live-streamed five new episodes about Building with EffectTS, Svelte 5, and Postgres on his Twitch channel.

  • Expo Developers created a video guide on building local-first applications, focusing primarily on LiveStore while showcasing the data validation capabilities of Effect Schema.

    Play

  • Last but not least, you can now follow Effect on our Bluesky account too.

Effect content updates

  • The fourth episode of Building an Effect Warehouse App has already been published on the Effect YouTube Channel.

    Play

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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