alchemy

Infrastructure-as-Effects — cloud infrastructure and application logic as a single, type-safe Effect program.

Docs · Tutorial · Examples · Discord

A Worker bound to a R2 bucket and serving objects from it:

const Bucket = Cloudflare.R2Bucket("bucket");

export default Cloudflare.Worker(
  "api",
  { main: import.meta.url },
  Effect.gen(function* () {
    const bucket = yield* Cloudflare.R2.ReadWrite(Bucket);
    return {
      fetch: Effect.gen(function* () {
        const request = yield* HttpServerRequest;
        const object = yield* bucket.get(request.url);
        return HttpServerResponse.stream(object!.body);
      })
    };
  }),
);

One bind() wires the binding, env var, and typed connection — at deploy time and at runtime.

• One program, one language. Resources, Lambdas/Workers, IAM, and SDKs live in the same Effect program — no YAML, no second runtime.
• Bindings, not glue code. S3.GetObject(bucket) wires the IAM policy, env var, and a typed SDK call in a single line.
• Errors in the type system. Every cloud API failure is a tagged Effect error you handle — or don't — on purpose.
• AWS + Cloudflare today. S3, SQS, DynamoDB, Kinesis, Lambda, EC2 / Workers, R2, D1, Durable Objects, Containers.
• Same code, every stage. Local dev, plan / deploy, smoke tests, and CI all share one mental model.

bun add alchemy@next effect@next

Bootstrap with an AI coding agent

Paste this into Claude Code, Cursor, or any agent that can fetch a URL:

You are an Alchemy expert. Read https://v2.alchemy.run/llms.txt to load the
full documentation index, then act as my pair on this project.

Goal: help me set up, build, test, and deploy a cloud application with
`alchemy` (Infrastructure-as-Effects, powered by Effect).

Follow the patterns from the docs and the /examples folder. Stay idiomatic
to Effect: use Layers for wiring, return Effects from lifecycle code, and
keep infra and runtime in the same program. Ask before introducing new
dependencies or breaking conventions.

Learn more

• What is Alchemy? — the framework in 2 minutes
• Getting Started — your first Stack
• Tutorial — five-part walkthrough to a tested, CI-deployed app
• Examples — runnable projects on AWS and Cloudflare
• llms.txt — agent-ready documentation index

alchemy is in alpha. Expect breaking changes. Come hang in our Discord.

License

Apache-2.0