iti-technology/medusa/apps/backend/src/subscribers/README.md

Custom subscribers

Subscribers handle events emitted in the Medusa application.

Learn more about Subscribers in this documentation.

The subscriber is created in a TypeScript or JavaScript file under the src/subscribers directory.

For example, create the file src/subscribers/product-created.ts with the following content:

import {
  type SubscriberConfig,
} from "@medusajs/framework"

// subscriber function
export default async function productCreateHandler() {
  console.log("A product was created")
}

// subscriber config
export const config: SubscriberConfig = {
  event: "product.created",
}

A subscriber file must export:

• The subscriber function that is an asynchronous function executed whenever the associated event is triggered.
• A configuration object defining the event this subscriber is listening to.

Subscriber Parameters

A subscriber receives an object having the following properties:

• event: An object holding the event's details. It has a data property, which is the event's data payload.
• container: The Medusa container. Use it to resolve modules' main services and other registered resources.

import type {
  SubscriberArgs,
  SubscriberConfig,
} from "@medusajs/framework"

export default async function productCreateHandler({
  event: { data },
  container,
}: SubscriberArgs<{ id: string }>) {
  const productId = data.id

  const productModuleService = container.resolve("product")

  const product = await productModuleService.retrieveProduct(productId)

  console.log(`The product ${product.title} was created`)
}

export const config: SubscriberConfig = {
  event: "product.created",
}