TanStack
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TanStack Router is a type-safe, data-driven React router with built-in caching, prefetching, and nested layouts, while TanStack Start extends it into a full-stack SSR framework.
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FR-AI / ANALYSISWhy it is worth attention
It provides a schema-first, tagged class-based state machine API that is synchronized one-way with the official Effect repository, enabling early access and community validation before upstream inclusion.
Who it is for
- Effect-TS users needing state machine abstractions
- Developers building complex, type-safe workflows with Effect
- Early adopters who want to influence the design of upcoming Effect features
- Contributors involved in Effect's state machine proposal (PR #6429)
Use cases
- Modeling finite state machines in Effect applications with full type safety
- Building reactive systems with state transitions using the reactivity adapter
- Implementing clustered state machines for distributed or concurrent workflows
- Prototyping and testing the proposed Machine API before it lands in Effect core
Strengths
- Schema-first design ensures compile-time validation of states and events
- Independent ESM entrypoints are tree-shakeable, avoiding unnecessary imports
- Synchronization tool maintains exact alignment with the Effect PR without duplicating logic
- Comprehensive testing suite including runtime tests, type tests, and consumer validation
Considerations
- Early-release software with APIs subject to change and coupled to an exact Effect beta version
- Requires manual pinning of Effect version and lockstep upgrades with this package
- Intended to become a thin compatibility layer once the equivalent modules ship in Effect, implying eventual deprecation
README quick start
Installation
Description
Schema-first state machines and statecharts for Effect
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