effect-ts
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:
# 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+):
ServiceMap.Service,Effect.catch,Effect.forkChild,Schema.TaggedErrorClass
If the version is unclear, ask the user. Default to v3 patterns for existing codebases, v4 for new projects.
Primary Documentation Sources
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