Repository: medusajs/medusa
File: packages/core/core-flows/src/cart/workflows/complete-cart.ts (TypeScript)

Code before:

export type CompleteCartWorkflowOutput = {
  /**
   * The ID of the order that was created.
   */
  id: string
}

const THREE_DAYS = 60 * 60 * 24 * 3
const THIRTY_SECONDS = 30
const TWO_MINUTES = 60 * 2

export const completeCartWorkflowId = "complete-cart"
/**
 * This workflow completes a cart and places an order for the customer. It's executed by the
 * [Complete Cart Store API Route](https://docs.medusajs.com/api/store#carts_postcartsidcomplete).
 *
 * You can use this workflow within your own customizations or custom workflows, allowing you to wrap custom logic around completing a cart.
 * For example, in the [Subscriptions recipe](https://docs.medusajs.com/resources/recipes/subscriptions/examples/standard#create-workflow),
 * this workflow is used within another workflow that creates a subscription order.
 * 
 * ## Cart Completion Idempotency
 * 
 * This workflow is idempotent, meaning that if it is executed multiple times with the same input, it will not create duplicate orders. The
 * same order will be returned for subsequent executions with the same cart ID. This is necessary to avoid rolling back payments or causing
 * other side effects if the workflow is retried or fails due to transient errors.
 * 
 * So, if you use this workflow within your own, make sure your workflow's steps are idempotent as well to avoid unintended side effects. The following
 * sections cover some common scenarios and how to handle them.
 * 
 * ### Creating Links and Linked Records
 * 
 * In some cases, you might want to create custom links or linked records to the order. For example, you might want to create a link from the order to a
 * digital order.
 * 
 * In such cases, ensure that your workflow's logic checks for existing links or records before creating new ones. You can query the 
 * [entry point of the link](https://docs.medusajs.com/learn/fundamentals/module-links/custom-columns#method-2-using-entry-point)
 * to check for existing links before creating new ones.
 * 
 * For example:
 * 
 * ```ts
 * import {
 *   createWorkflow,
 *   when,
 *   WorkflowResponse
 * } from "@medusajs/framework/workflows-sdk"
 * import { 
 *   useQueryGraphStep,
 *   completeCartWorkflow,
 *   acquireLockStep,

Review comment (refactor):
Do you think we should specifically mention concurrency usage of the workflow, such that the lock manages the queuing but they will run one after each other leading 100% error if not managed idempotently in the sense that errors will occur already because we would duplicate things?

Code after:

export type CompleteCartWorkflowOutput = {
  /**
   * The ID of the order that was created.
   */
  id: string
}

const THREE_DAYS = 60 * 60 * 24 * 3
const THIRTY_SECONDS = 30
const TWO_MINUTES = 60 * 2

export const completeCartWorkflowId = "complete-cart"
/**
 * This workflow completes a cart and places an order for the customer. It's executed by the
 * [Complete Cart Store API Route](https://docs.medusajs.com/api/store#carts_postcartsidcomplete).
 *
 * You can use this workflow within your own customizations or custom workflows, allowing you to wrap custom logic around completing a cart.
 * For example, in the [Subscriptions recipe](https://docs.medusajs.com/resources/recipes/subscriptions/examples/standard#create-workflow),
 * this workflow is used within another workflow that creates a subscription order.
 * 
 * ## Cart Completion Idempotency
 * 
 * This workflow's logic is idempotent, meaning that if it is executed multiple times with the same input, it will not create duplicate orders. The
 * same order will be returned for subsequent executions with the same cart ID. This is necessary to avoid rolling back payments or causing
 * other side effects if the workflow is retried or fails due to transient errors.
 * 
 * So, if you use this workflow within your own, make sure your workflow's steps are idempotent as well to avoid unintended side effects.
 * Your workflow must also acquire and release locks around this workflow to prevent concurrent executions for the same cart.
 * 
 * The following sections cover some common scenarios and how to handle them.
 * 
 * ### Creating Links and Linked Records
 * 
 * In some cases, you might want to create custom links or linked records to the order. For example, you might want to create a link from the order to a
 * digital order.
 * 
 * In such cases, ensure that your workflow's logic checks for existing links or records before creating new ones. You can query the 
 * [entry point of the link](https://docs.medusajs.com/learn/fundamentals/module-links/custom-columns#method-2-using-entry-point)
 * to check for existing links before creating new ones.
 * 
 * For example:
 * 
 * ```ts
 * import {
 *   createWorkflow,
 *   when,
 *   WorkflowResponse
 * } from "@medusajs/framework/workflows-sdk"
 * import { 
 *   useQueryGraphStep,