TanStack

TanStack / workflow

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🤖 Type-safe durable execution for agents and workflows. Resumable runs, append-only history, and compensable steps for TS/JS, React, Solid, Vue, and Svelte.

24
0
94% credibility
Found May 26, 2026 at 24 stars -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
TypeScript
AI Summary

TanStack Workflow is a TypeScript library for building reliable, long-running business processes. Think of it as a way to write code that can take breaks—your workflow can pause to wait for a person to approve something, wait for an external system to send a message, or simply wait until a certain time. The key benefit is durability: if your server restarts while a workflow is waiting, it picks up exactly where it left off without losing any progress. Developers define workflows as ordinary async functions with built-in steps for reliable operations, time-based pauses, approval gates, and custom events. The system automatically records everything in an append-only log, enabling replay and resume across server restarts. It supports middleware for adding shared functionality (like authentication or tracing) and includes version routing so you can update workflows without breaking in-progress runs.

How It Works

1
📚 You learn about TanStack Workflow

You discover a tool for building reliable business processes that can pause, wait for approvals, and resume exactly where they left off.

2
✍️ You write your first workflow

You define a workflow as a simple function with steps, using clear input and output types that TypeScript understands automatically.

3
🚀 You start your workflow and watch it run

You launch your workflow and it starts processing, completing each step in order while keeping track of everything in a durable log.

4
⏸️ Workflow pauses and waits

When your workflow reaches a point that needs human approval or an external event, it automatically pauses and saves its progress safely.

5
Workflow can wait for different things
👤
Waiting for a person to approve

Workflow pauses and shows someone a prompt to approve or reject an action.

🔔
Waiting for an external event

Workflow pauses until a webhook arrives or a timer fires.

6
🔄 The event arrives and workflow wakes up

When the approval comes in or the webhook arrives, your workflow automatically wakes up and continues from where it stopped.

✅ Your workflow completes successfully

Whether it took minutes or days, your workflow finishes with the same reliable result, even if your server restarted in between.

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AI-Generated Review

What is workflow?

TanStack Workflow is a TypeScript library for writing type-safe durable workflows. It lets you express complex multi-step processes as ordinary async functions that can pause, wait for external events, get approved by humans, and resume exactly where they left off - even after server restarts. The workflow engine handles replay logic, idempotency, and state persistence, so you write business logic instead of infrastructure code.

Why is it gaining traction?

Unlike traditional workflow engines that require learning proprietary YAML schemas or DSLs, TanStack Workflow feels like writing normal TypeScript. Your workflow is a function that receives a `ctx` object with primitives like `ctx.step()` for durable side effects, `ctx.waitForEvent()` for external signals, `ctx.approve()` for human-in-the-loop gates, and `ctx.sleep()` for timed delays. The library uses Zod schemas for input/output validation and includes an in-memory run store for local development. Framework bindings for React, Solid, Vue, and Svelte are in the works.

Who should use this?

Backend developers building payment processing, onboarding flows, or approval pipelines that need to survive crashes and restarts. AI application developers who need durable agent execution. Teams tired of stitching together cron jobs, webhook handlers, and database transactions into fragile state machines.

Verdict

TanStack Workflow shows strong design thinking - the closure-based API is ergonomic and the type-safe middleware system is elegant. However, at 24 stars with pre-alpha status, framework bindings, and storage adapters still forthcoming, treat this as a technical preview rather than production-ready. The 0.95% credibility score reflects its early stage. Worth watching and experimenting with in non-critical projects, but wait for stable framework integrations before betting production workloads on it.

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