effect-facet-unstable-rpc-rpcmiddleware

name	effect-facet-unstable-rpc-rpcmiddleware
description	Guidance for facet `effect/unstable/rpc/RpcMiddleware` focused on APIs like Service, Provides, and layerClient. Load after `effect-skill-router` when this facet is the primary owner.

Effect Facet unstable/rpc/RpcMiddleware

Owned scope

• Owns only effect/unstable/rpc/RpcMiddleware.
• Parent module: effect/unstable/rpc.
• Source anchor: packages/effect/src/unstable/rpc/RpcMiddleware.ts.

What it is for

• Module-specific APIs and usage patterns for Effect programs.

API quick reference

• Service
• Provides
• layerClient
• ServiceClass
• Any
• AnyId
• Error
• TypeId
• Requires
• ForClient
• AnyService
• ErrorSchema
• SuccessValue
• ApplyServices
• RpcMiddleware
• AnyServiceWithProps
• ErrorServicesDecode
• ErrorServicesEncode
• Full API list: references/api-reference.md

How to use it

• Use schema/codec APIs to validate inputs at boundaries before business logic.
• Keep runtime/execute APIs at edges; compose pure transformations before execution.
• Assume unstable APIs can evolve quickly; isolate usage behind thin local adapters.

Starter example

import { RpcMiddleware } from "effect/unstable/rpc/RpcMiddleware";

const value = RpcMiddleware.Service();
const next = RpcMiddleware.ErrorServicesDecode(value);

Common pitfalls

• Unstable module contracts may change; avoid coupling core app logic directly to experimental details.
• Prefer explicit, typed combinators over ad-hoc casting or unchecked assumptions.

Not covered here

• Sibling facets under the same parent are out of scope:
  • effect-facet-unstable-rpc-rpc (effect/unstable/rpc/Rpc)
  • effect-facet-unstable-rpc-rpcclient (effect/unstable/rpc/RpcClient)
  • effect-facet-unstable-rpc-rpcclienterror (effect/unstable/rpc/RpcClientError)
  • effect-facet-unstable-rpc-rpcgroup (effect/unstable/rpc/RpcGroup)
  • effect-facet-unstable-rpc-rpcmessage (effect/unstable/rpc/RpcMessage)
  • effect-facet-unstable-rpc-rpcschema (effect/unstable/rpc/RpcSchema)
  • effect-facet-unstable-rpc-rpcserialization (effect/unstable/rpc/RpcSerialization)
  • effect-facet-unstable-rpc-rpcserver (effect/unstable/rpc/RpcServer)
  • effect-facet-unstable-rpc-rpctest (effect/unstable/rpc/RpcTest)
  • effect-facet-unstable-rpc-rpcworker (effect/unstable/rpc/RpcWorker)
  • effect-facet-unstable-rpc-utils (effect/unstable/rpc/Utils)
• Parent module ownership belongs to effect-module-unstable-rpc.

Escalate to

• effect-module-unstable-rpc for parent module-wide workflows.
• effect-skill-router for cross-module routing and ownership checks.

Reference anchors

• Facet source: packages/effect/src/unstable/rpc/RpcMiddleware.ts
• Parent tests: packages/effect/test/cluster/MessageStorage.test.ts
• Parent tests: packages/effect/test/rpc/Rpc.test.ts
• API details: references/api-reference.md
• Usage notes: references/usage-reference.md
• Ownership mapping: references/owner.md