| name | effect-typescript |
| description | Use when writing, reviewing, or refactoring Effect 4 TypeScript code: Effect.gen, typed errors, Context.Service, Layer, Schedule, polling, resource safety, and strict inference. |
Effect TypeScript
Use this skill for non-trivial work involving effect in this repo.
Canonical References
- Effect docs:
https://effect.website/docs
- Effect LLM docs:
https://effect.website/llms-full.txt
- Effect source:
https://github.com/Effect-TS/effect
- Alchemy source:
https://github.com/alchemy-run/alchemy-effect
Fetch docs before making claims about APIs that changed across Effect 4 betas.
Repo Constraints
- This repo currently tests
alchemy@2.0.0-beta.59 with effect@4.0.0-beta.84.
- Do not bump to Effect beta.78 until a newer Alchemy beta containing upstream PR #542 is published.
- Keep provider implementation code inside Alchemy v2 lifecycle methods.
- Do not call
Effect.runPromise in library/provider internals.
- Prefer typed tagged errors for recoverable cloud/API failures.
Patterns
- Use
Effect.gen for sequential provider lifecycle logic.
- Use
Effect.tryPromise({ try, catch }) at async boundaries.
- Use
Effect.catchIf(isNotFound, ...) for idempotent delete/read recovery.
- Use
Context.Service and Layer for credentials/services.
- Keep secret values in
Redacted until SDK/API boundaries.
Review Checklist
- Are
A, E, and R meaningful and not accidentally widened?
- Are errors recoverable by tag/predicate?
- Is polling bounded and failure explicit?
- Are resources deleted idempotently?
- Are TypeScript assertions hiding an inference/design problem?
