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1const reserveStock = createStep(
2  { name: 'reserve-stock', maxRetries: 3 },
3  async (items, { container }) => {
4    const inventory = container.resolve('inventory')
5    const claim = await inventory.reserve(items)
6    return new StepResponse(claim, claim.id)
7  },
8  // rollback: release the claim
9  async (claimId, { container }) => {
10    await container
11      .resolve('inventory')
12      .release(claimId)
13  }
14)
15
16export const checkoutFlow = createWorkflow(
17  'checkout-flow',
18  (input: { cartId: string }) => {
✓19    const cart = loadCart({ id: input.cartId })
✓20    const claim = reserveStock(cart.items)
✓21    const charge = capturePayment({
22      amount: cart.total,
23      currency: cart.currency,
24    })
✓25    const order = persistOrder({ cart, charge })
26
27    when(cart, c => c.sameDay).then(() =>
28      dispatchCourier({ orderId: order.id })
29    )
30
31    return new WorkflowResponse({
32      order, claim, charge,
33    })
34  }
35)