# Effect-TS/effect · RepoSense Release & Migration Intelligence

> Ships `effect@effect@4.1.2` with upstream runtime refineme. Drop-in upgrade. Migration: None.

## Metadata
- **Repository URL**: https://github.com/Effect-TS/effect
- **Primary Package**: `effect` (NPM)
- **Categories**: `STATE_MANAGEMENT`, `BACKEND`, `ECOSYSTEM`
- **Latest Version**: `effect@4.1.2`
- **Semantic Status**: `COMPATIBLE`
- **Bundle Size Impact (unavailable)**: `Size Unavailable`
- **Atom Ingestion Feed**: https://github.com/Effect-TS/effect/releases.atom

## The Human Context (Plain-English Pitch)
effect is an open-source library and developer tool in the Effect-TS/effect ecosystem. It saves developers from writing repetitive low-level boilerplate from scratch by providing a battle-tested, open-source implementation ready for production.

## Stage 1 Executive Summary ([Core Change] + [Required Action] + [Migration Effort])
Ships `effect@effect@4.1.2` with upstream runtime refineme. Drop-in upgrade. Migration: None.

## Breaking Changes & Required Actions
- Ships `effect@effect@4.1.2` with upstream runtime refinements and stability fixes from `Effect-TS/effect`.
- Updates TypeScript declarations and internal module exports for `effect@4.1.2`.

## Migration Snippet
```ts
npm install effect@effect@4.1.2
```

## Ecosystem Compatibility Matrix & Graph Warnings
- **TypeScript 5.x** [`COMPATIBLE`]: Ships standard TypeScript declaration files without type regressions.

## Zero-Noise Release Timeline
- **effect@4.1.2** (2026-11-02) [COMPATIBLE]: Ships `effect@effect@4.1.2` with upstream runtime refineme. Drop-in upgrade. Migration: None.

## Upgrade & Migration Q&A (GEO Direct Answers)
### Is Effect-TS/effect effect@4.1.2 safe to upgrade in production?
Effect-TS/effect effect@4.1.2 is classified as COMPATIBLE (PATCH release). Ships `effect@effect@4.1.2` with upstream runtime refineme. Drop-in upgrade. Migration: None.

### What breaking changes or compatibility risks exist in Effect-TS/effect effect@4.1.2?
No breaking API changes or peer dependency conflicts are recorded for Effect-TS/effect effect@4.1.2 in the RepoSense compatibility graph.

### What is the bundle size impact of effect effect@4.1.2?
Measured bundle size telemetry is currently unavailable for effect effect@4.1.2; verify build output locally before deploying.

### How do I upgrade effect to effect@4.1.2?
Upgrade effect to effect@4.1.2 by running "npm install effect@effect@4.1.2" and applying the migration steps: npm install effect@effect@4.1.2