Stroid
A TypeScript state-management engine I designed for React and concurrent SSR, focused on deterministic state behavior across server requests, hydration, persistence, synchronization, and runtime diagnostics.
Overview
Purpose: Solve state correctness problems that become difficult under concurrent SSR, streaming, hydration, and multi-store applications.
Target users: React and Next.js developers who need per-request state isolation, deterministic hydration, cross-tab synchronization, persistence, computed state, runtime diagnostics, and modular tree-shakeable APIs.
Tech Stack
Current published line: v0.1.x
Frontend
- TypeScript
- React peer integration
- AsyncLocalStorage
DevOps
- Vitest
- Node test runner
- tsup
- API Extractor
- publint
- Are The Types Wrong
- GitHub Actions
- release-please
- Dependabot
- CodeQL
- OSSF Scorecard
Features
Per-Request SSR Isolation
Stroid creates request-scoped state registries so concurrent requests do not share mutable application state.
How: AsyncLocalStorage-backed request scopes with explicit request registry helpers.
Benefit: Prevents cross-request state contamination in SSR applications.
Post-Hydration Consistency Contracts
hydrateStores(...) supports an explicit consistency contract covering snapshot metadata, store authority (server_wins, client_wins, merge, invalidate_and_refetch), drift diagnostics, configurable boot windows, and deterministic early-write replay.
Benefit: Hydration becomes a defined state transition rather than an implicit race between server state and early client writes.
Modular Subpath Exports
Stroid exposes dedicated subpaths for core, React, server, persistence, synchronization, selectors, runtime tools, async state, testing, and other capabilities.
Benefit: Consumers import only the functionality they need, improving tree-shaking and making the package surface explicit.
Runtime Introspection
Runtime tooling exposes store discovery, metrics, store health, hydration consistency state, drift events, drift metrics, and DevTools history/redaction.
Persistence & Synchronization
Persistence supports browser storage, checksums, and migrations. Synchronization supports BroadcastChannel, cross-tab state propagation, and worker-style synchronization.
How: Features self-register through hooks so unused modules do not impose the same runtime cost as always-on functionality.
Architecture
App flow: The store name acts as the stable address used across read, write, subscribe, persist, sync, compute, and debugging operations.
Database Design
Not applicable — client-side state library, no database.
API Documentation
Stroid is a package API rather than a REST API. Documentation includes generated API references and topic-based guides for Core, Architecture, Server, React, Persistence, Sync, Testing, Migration, TypeScript, Configuration, DevTools, and FAQ.
Authentication Flow
notes: Not applicable — client-side state library, no auth surface.
Screenshots
Challenges
Problem: Tree-Shakeable Feature Growth — supporting many optional capabilities without forcing every consumer to bundle them.
Solution: I designed a multi-entry package with explicit subpath exports, normalized type declarations, and publish-surface validation.
Problem: Hydration Determinism — storage events, effects, network responses, and sync messages can all write during hydration.
Solution: I introduced authority policies, boot-window write deferral, deterministic replay, and drift observability.
Problem: Concurrency Certification — correctness under race conditions is difficult to demonstrate with normal unit tests alone.
Solution: I built a large first-party benchmark and adversarial test suite covering SSR isolation, hydration divergence, randomized timing, large payloads, WebSocket/sync streams, atomic failure, race conditions, memory behavior, and production-like scenarios.
Performance
Lighthouse: Not applicable — not a web page.
- Tree-shakeable subpath exports
- Lazy feature lifecycle short-circuiting
- Computed graph ordering memoization
- Request isolation without a global lock
- Dedicated core-operation benchmarks
- Large-payload hydration benchmarks
- React concurrency benchmarks
Security
- GitHub Security Advisories
- CodeQL
- OSSF Scorecard
- Dependency review
- Dependabot
- Explicit GitHub Actions token permissions
- Pinned workflow actions where appropriate
- Controlled npm publishing
- Automated release process
Deployment
hosting: Published to npm with automated release and publishing workflows.
cicd: Release pipeline separates version/changelog generation, test and quality gates, GitHub release creation, and npm publication.
Future Improvements
- SSR/runtime interoperability
- Developer ergonomics
- Hydration diagnostics
- Performance certification
- Documentation
- Framework compatibility
Lessons Learned
- Library architecture includes packaging, types, exports, documentation, and release tooling—not only runtime logic.
- Concurrent SSR problems are often ordering problems rather than simple state-update problems.
- Deterministic reconciliation rules are more useful than assuming one universal hydration policy.
- A package's published surface should be tested as carefully as its internal implementation.
- Security and supply-chain controls matter even when the project does not run its own server.
Project Metrics
Timeline
- February 2026 — Project started
- March 2026 — Initial public releases
- April 2026 — Post-hydration consistency and server-portability work
- April–June 2026 — Hardening, benchmarks, regression coverage, packaging, and dependency maintenance
Ask about this project
Depends on the /api/chat orchestrator and MCP tool server — not built yet (see plan.md).
Recruiter Summary
Role: Solo Library Author / Maintainer
- Designed a TypeScript state engine for concurrent SSR
- Implemented per-request isolation
- Designed post-hydration reconciliation contracts
- Built React integration around useSyncExternalStore
- Created modular subpath exports
- Built persistence, synchronization, computed state, async state, runtime diagnostics, and developer tooling
- Built automated releases, npm publication, security scanning, and package-surface validation
- Created extensive adversarial benchmark and regression coverage
- Published a real npm package with versioned releases
- Built a state architecture focused on correctness under concurrent rendering
- Demonstrated package design, API stability, release engineering, testing, and supply-chain security beyond normal application development