feat(medusa): Migrate NotificationService to TS + add NotificationInterface (#1922)

packages/medusa/src/interfaces/index.ts

@@ -4,5 +4,7 @@ export * from "./tax-service"
 export * from "./transaction-base-service"
 export * from "./batch-job-strategy"
 export * from "./file-service"
+export * from "./notification-service"
+export * from "./price-selection-strategy"
 export * from "./models/base-entity"
 export * from "./models/soft-deletable-entity"

packages/medusa/src/interfaces/notification-service.ts

@@ -0,0 +1,55 @@
+import { TransactionBaseService } from "./transaction-base-service"
+import BaseNotificationService from "medusa-interfaces/dist/notification-service"
+
+type ReturnedData = {
+  to: string
+  status: string
+  data: Record<string, unknown>
+}
+
+export interface INotificationService<T extends TransactionBaseService<never>>
+  extends TransactionBaseService<T> {
+  sendNotification(
+    event: string,
+    data: unknown,
+    attachmentGenerator: unknown
+  ): Promise<ReturnedData>
+
+  resendNotification(
+    notification: unknown,
+    config: unknown,
+    attachmentGenerator: unknown
+  ): Promise<ReturnedData>
+}
+
+export abstract class AbstractNotificationService<
+    T extends TransactionBaseService<never>
+  >
+  extends TransactionBaseService<T>
+  implements INotificationService<T>
+{
+  static identifier: string
+
+  getIdentifier(): string {
+    return (this.constructor as any).identifier
+  }
+
+  abstract sendNotification(
+    event: string,
+    data: unknown,
+    attachmentGenerator: unknown
+  ): Promise<ReturnedData>
+
+  abstract resendNotification(
+    notification: unknown,
+    config: unknown,
+    attachmentGenerator: unknown
+  ): Promise<ReturnedData>
+}
+
+export const isNotificationService = (obj: unknown): boolean => {
+  return (
+    obj instanceof AbstractNotificationService ||
+    obj instanceof BaseNotificationService
+  )
+}