Effect-TS/effect — what it is and what it’s for

About the project

A TypeScript library for building robust production applications: typed errors, dependency injection, structured concurrency, tracing, and schema validation.

Useful for

Build a service with dependency injection and typed errors
Add OpenTelemetry tracing to a TypeScript application
Connect a SQL client to PostgreSQL or SQLite via @effect/sql

README summarized by DeepSeek V4.1 Flash. Details may be inaccurate.

Why it’s trending

39 stars so far today, about 74 expected by the end of the day. The usual pace is 20 per day, so that's 3.7× as much.
Over the last two days the pace is 6.1× that of the previous week and a half.
The spike has held for 2 days in a row — not a one-off blip.
GitHub Trending today: #16, +76 stars.
GitHub Trending TypeScript today: #5, +76 stars.
Hacker News: “Effect 4.0” — 72 points, 18 h ago.
Recent forks include notable developers: @gunta (227 followers).

Stars per day

Bars are daily stars, the line is the usual pace. Red marks spike days.

Numbers

Total stars: 16,403
Today: 39 · ≈ 74 by evening
Forks: 794
Issues and pull requests: 8,636
Watchers: 39
Language: TypeScript
License: MIT
Latest release: @effect/[email protected] · October 1, 2026
Created: November 13, 2019
Last push: October 2, 2026

Star trust

Growth looks organic: forks and discussion are in line with active projects, and stars arrive unevenly, the way people give them.

These are heuristics, not a verdict: we judge by the repository’s behavior, not by a list of stargazers.

Hacker News discussions

Effect 4.072 points, October 1, 2026

Spotted in

October 2, 2026GitHub Trending today: #16, +76 stars; GitHub Trending TypeScript today: #5, +76 stars

Share

README badge

Paste it into your README — the badge shows the current magnitude and links to this page.

[![Seismograph](https://gitnova.dev/badge/Effect-TS/effect.svg?lang=en)](https://gitnova.dev/en/r/Effect-TS/effect)

More in this category

6.4
edgcpp/compiler
Open-source C/C++ compiler built on the EDG front end: parsing compatible with Clang, GCC and MSVC, C- and C++-generating back ends, a prelinker, and utilities for working with the intermediate language.

Early signalDeveloper toolsC+50 stars today, ≈ 116 by evening
5.7
tile-ai/tilelang
A Pythonic domain-specific language built on TVM for writing high-performance GPU/CPU/NPU kernels (GEMM, FlashAttention, etc.) with low-level optimizations.

BreakoutDeveloper toolsPython+38 stars today, ≈ 101 by evening
4.7
luxine/CalcKernel
CalcKernel is a statically typed language for numerical computation kernels, compiled to native code, C, or WebAssembly and callable from larger applications via typed interfaces.

Early signalDeveloper toolsRust+20 stars today, ≈ 49 by evening
4.5
t8y2/dbx
A 20 MB lightweight cross-platform database client for 90+ databases (MySQL, PostgreSQL, SQLite, Redis, MongoDB, etc.) with built-in AI assistant, MCP server, CLI, and desktop/Docker modes.

PeakingDeveloper toolsRust+57 stars today, ≈ 157 by evening
4.3
alpcanaydin/tusk
A native macOS database client built in Rust on GPUI: supports 20 databases, an editable data grid, a SQL editor, and an AI assistant that writes queries but never runs them itself.

Early signalDeveloper toolsRust+26 stars today, ≈ 56 by evening
4.3
deepseek-ai/dsh-libreoffice-kit
Node.js library for converting Office documents to PDF and PNG with configurable font control and substitutions, shipping prebuilt LibreOffice engines for macOS, Windows, and Linux (WASM).

Early signalDeveloper toolsJavaScript+14 stars today, ≈ 36 by evening