effect-tslisted

# Effect-TS Effect is a TypeScript library for building production-grade software with typed errors, structured concurrency, dependency injection, and built-in observability. ## Version Detection Before writing Effect code, detect which version the user is on: ```bash # Check installed version cat package.json | grep '"effect"' ``` - **v3.x** (stable, most production codebases): `Context.Tag`, `Effect.catchAll`, `Effect.fork`, `Data.TaggedError` - **v4.x** (beta, Feb 2026+): `Context.Service`, `Effect.catch`, `Effect.forkChild`, `Schema.TaggedErrorClass` > Note: v4 beta briefly used a `ServiceMap` module, renamed back to `Context` on 2026-04-07 (PR #1961). If you see `ServiceMap.*` in any doc or older beta code, it is the current `Context.*`. Both v3 and v4 import `Context` from `"effect"`; the exports inside differ (`Context.Tag` in v3 vs `Context.Service` in v4). If the version is unclear, ask the user. Default to v3 patterns for existing codebases, v4 for new projects. ## Primary Documentation Sources - https://effect.website/docs (v3 stable docs) - https://effect.website/llms.txt (LLM topic index) - https://effect.website/llms-full.txt (full docs for large context) - https://tim-smart.github.io/effect-io-ai/ (concise API list) - https://github.com/Effect-TS/effect-smol (v4 source + migration guides) - https://github.com/Effect-TS/effect-smol/blob/main/LLMS.md (v4 LLM guide) ## AI Guardrails: Critical Corrections LLM outputs frequently contain incorrect Effect A