AwilixResolutionError: Could Not Resolve X
This troubleshooting guide will help you figure out the different situations that can cause an AwilixResolutionErrorCopy to Clipboard.
Option 1: Service Lifetime
If you're registering a custom resource within a middleware, for example a logged-in user, then make sure that all services that are using it have their LIFE_TIMECopy to Clipboard static property either set to Lifetime.SCOPEDCopy to Clipboard or Lifetime.TRANSIENTCopy to Clipboard. This mainly applies for services in the core Medusa package, as, by default, their lifetime is Lifetime.SINGLETONCopy to Clipboard.
For example:
import { Lifetime } from "awilix"
import {
ProductService as MedusaProductService,
} from "@medusajs/medusa"
// extending ProductService from the core
class ProductService extends MedusaProductService {
// The default life time for a core service is SINGLETON
static LIFE_TIME = Lifetime.SCOPED
// ...
}
export default ProductService
This may require you to extend a service as explained in this documentation if necessary.
If you're unsure which service you need to change its LIFE_TIMECopy to Clipboard property, it should be mentioned along with the AwilixResolutionErrorCopy to Clipboard message. For example:
AwilixResolutionError: Could not resolve 'loggedInUser'.
Resolution path: cartService -> productService -> loggedInUser
As shown in the resolution path, you must change the LIFE_TIMECopy to Clipboard property of both cartServiceCopy to Clipboard and productServiceCopy to Clipboard to Lifetime.SCOPEDCopy to Clipboard or Lifetime.TRANSIENTCopy to Clipboard.
You can learn about the service lifetime in the Create a Service documentation.
Option 2: Using Try-Catch Block with Custom Registration
When you register a custom resource using a middleware, make sure that when you use it in a service's constructor you wrap it in a try-catch block. This can cause an error when the Medusa backend first runs, especially if the service is used within a subscriber. Subscribers are built the first time the Medusa backend runs, meaning that their dependencies are registered at that point. Since your custom resource hasn't been registered at this point, it will cause an AwilixResolutionErrorCopy to Clipboard when the backend tries to resolve it.
For that reason, and to avoid other similar situations, make sure to always wrap your custom resources in a try-catch block when you use them inside the constructor of a service. For example:
import { TransactionBaseService } from "@medusajs/medusa"
class CustomService extends TransactionBaseService {
constructor(container, options) {
super(...arguments)
// use the registered resource.
try {
container.customResource
} catch (e) {
// avoid errors when the backend first loads
}
}
}
export default CustomService
You can learn more about this in the Middlewares documentation.
Option 3: Error on A Fresh Installation
If you get the error on a fresh installation of the Medusa backend, or you haven't made any customizations that would cause this error, try to remove the node_modulesCopy to Clipboard directory, then run the following command in the root directory of the Medusa backend to re-install the dependencies: