RyteType-safe workflow engine for TypeScript

Define states with any Standard Schema validator. Route commands through middleware. Ship with confidence.

Fully Typed, Zero Annotations

Any Standard Schema validator (Zod, Valibot, ArkType) defines your states, commands, events, and errors. TypeScript infers everything — state names, payload types, error codes — with full autocompletion. No manual type annotations needed.

Discriminated Unions

Checking workflow.state narrows workflow.data automatically. error() only accepts error codes from your definition. Every handler argument is precisely typed.

Middleware Pipelines

Koa-style onion model with global, state-scoped, and inline middleware. Add auth, logging, or validation without touching handlers.

Composable Routers

Split handlers across files and compose them with .use(). Routers can be nested arbitrarily. Parent handlers take priority.

Domain Errors as Contract

Define error codes and their data shapes upfront. Errors are part of the workflow contract, not hidden inside handlers.

Zero Validator Lock-in

Pick Zod, Valibot, or ArkType — or swap between them. Core has no runtime dependency on any validator. Works on Node.js, Bun, and Deno.