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 of the key features 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.

Get started with Effect with our quick-start guide and documentation below:

• Effect quick-start guide
• Effect docs

Recent major updates:

• Effect is API stable with the Effect 3.0 release.
• Effect 3.8 has been released.
• The Effect community on Discord reached 3610+ members!

#Technology

Here are all the technical changes from this week.

#Effect Core

• Added Stream.mergeWithTag (Feature)
• Consider async operation in runSync as a defect, add span based stack (Bug Fix)
• Add deno support to Inspectable (Feature, next-minor)

#Effect Opentelemetry

• Add withActiveSpan function to attach Effect to current Span (Feature)

#Effect Platform

• Add deno support to Inspectable (Feature, next-minor)

#Effect RPC

• Ensure rpc chunks are always delimited on write (Bug Fix)

#Effect Schema

• Add deno support to Inspectable (Feature, next-minor)

#Effect SQL

• Accept TLS options for SSL configuration of PgClient (Bug Fix)

#General Chores

• Add codemod to propagate JSDoc comments to dual signatures (Feature)

#Community highlights

• We're thrilled to announce the second edition of Effect Days taking place on March 19-21, 2025 at Palazzo Pancaldi in the Tuscan Italian town, Livorno. All event details will be shared soon! Make sure you join our Discord Community to stay updated.

• The Evryg team has announced that the third Effect Paris Meetup is coming later in October. Now accepting talk submissions—submit yours today! As a reminder, the meetup will be in French.

• Dillon Mulroy, Software Engineer at Vercel, livestreamed two new episodes about Building a Job Queue with EffectTS, and three episodes of his new series, Building with EffectTS, Svelte 5, and Postgres on his Twitch Channel.

• Sandro Maglione's published his React 19 + Effect project template, where he shares the setup he's using in his projects along with other valuable insights.

#Effect content updates

• Maxwell Brown and Michael Arnaldi were live on X and Twitch on Wednesday with a new episode of Effect Cluster - Design Sync Session. The video will soon be available on our YouTube.

• On the same day, Max and Tim Smart were live with the seventh episode of Reimagining ContentLayer with Effect.

• Part 6 of Effect Cluster - Design Sync Session has already been published on the Effect YouTube Channel.

#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