feat: event aggregator (#6218)

What:
- Event Aggregator Util
- Preparation for normalizing event in a new format (backward compatible with the current format)
- GQL Schema to joiner config and some Entities configured
- Link modules emmiting events

packages/inventory/src/joiner-config.ts

@@ -1,6 +1,7 @@
 import { Modules } from "@medusajs/modules-sdk"
 import { ModuleJoinerConfig } from "@medusajs/types"
 import { InventoryItem, InventoryLevel, ReservationItem } from "./models"
+import moduleSchema from "./schema"
 
 export const joinerConfig: ModuleJoinerConfig = {
   serviceName: Modules.INVENTORY,
@@ -10,46 +11,30 @@ export const joinerConfig: ModuleJoinerConfig = {
     inventory_level_id: InventoryLevel.name,
     reservation_item_id: ReservationItem.name,
   },
+  schema: moduleSchema,
   alias: [
     {
-      name: "inventory_items",
-    },
-    {
-      name: "inventory",
-    },
-    {
-      name: "inventory_level",
+      name: ["inventory_items", "inventory"],
       args: {
+        entity: "InventoryItem",
+      },
+    },
+    {
+      name: ["inventory_level", "inventory_levels"],
+      args: {
+        entity: "InventoryLevel",
         methodSuffix: "InventoryLevels",
       },
     },
     {
-      name: "inventory_levels",
-      args: {
-        methodSuffix: "InventoryLevels",
-      },
-    },
-    {
-      name: "reservation_items",
-      args: {
-        methodSuffix: "ReservationItems",
-      },
-    },
-    {
-      name: "reservation_item",
-      args: {
-        methodSuffix: "ReservationItems",
-      },
-    },
-    {
-      name: "reservation",
-      args: {
-        methodSuffix: "ReservationItems",
-      },
-    },
-    {
-      name: "reservations",
+      name: [
+        "reservation",
+        "reservations",
+        "reservation_item",
+        "reservation_items",
+      ],
       args: {
+        entity: "ReservationItem",
         methodSuffix: "ReservationItems",
       },
     },

packages/inventory/src/models/inventory-item.ts

@@ -6,9 +6,11 @@ import {
   DeleteDateColumn,
   Entity,
   Index,
+  OneToMany,
   PrimaryColumn,
   UpdateDateColumn,
 } from "typeorm"
+import { InventoryLevel } from "./inventory-level"
 
 @Entity()
 export class InventoryItem {
@@ -67,6 +69,12 @@ export class InventoryItem {
   @Column({ type: "jsonb", nullable: true })
   metadata: Record<string, unknown> | null
 
+  @OneToMany(
+    () => InventoryLevel,
+    (inventoryLevel) => inventoryLevel.inventory_item
+  )
+  inventory_levels!: InventoryLevel[]
+
   @BeforeInsert()
   private beforeInsert(): void {
     this.id = generateEntityId(this.id, "iitem")

packages/inventory/src/models/inventory-level.ts

@@ -6,9 +6,12 @@ import {
   DeleteDateColumn,
   Entity,
   Index,
+  JoinColumn,
+  ManyToOne,
   PrimaryColumn,
   UpdateDateColumn,
 } from "typeorm"
+import { InventoryItem } from "./inventory-item"
 
 @Entity()
 @Index(["inventory_item_id", "location_id"], { unique: true })
@@ -45,6 +48,10 @@ export class InventoryLevel {
   @Column({ type: "jsonb", nullable: true })
   metadata: Record<string, unknown> | null
 
+  @ManyToOne(() => InventoryItem)
+  @JoinColumn({ name: "inventory_item_id" })
+  inventory_item: InventoryItem
+
   @BeforeInsert()
   private beforeInsert(): void {
     this.id = generateEntityId(this.id, "ilev")

packages/inventory/src/schema/index.ts

@@ -0,0 +1,55 @@
+export default `
+scalar DateTime
+scalar JSON
+
+type InventoryItem {
+  id: ID!
+  created_at: DateTime!
+  updated_at: DateTime!
+  deleted_at: DateTime
+  sku: String
+  origin_country: String
+  hs_code: String
+  mid_code: String
+  material: String
+  weight: Int
+  length: Int
+  height: Int
+  width: Int
+  requires_shipping: Boolean!
+  description: String
+  title: String
+  thumbnail: String
+  metadata: JSON
+  
+  inventory_levels: [InventoryLevel]
+}
+
+type InventoryLevel {
+  id: ID!
+  created_at: DateTime!
+  updated_at: DateTime!
+  deleted_at: DateTime
+  inventory_item_id: String!
+  location_id: String!
+  stocked_quantity: Int!
+  reserved_quantity: Int!
+  incoming_quantity: Int!
+  metadata: JSON
+}
+
+type ReservationItem {
+  id: ID!
+  created_at: DateTime!
+  updated_at: DateTime!
+  deleted_at: DateTime
+  line_item_id: String
+  inventory_item_id: String!
+  location_id: String!
+  quantity: Int!
+  external_id: String
+  description: String
+  created_by: String
+  metadata: JSON
+}
+`