feat(modules-sdk): define link (#7743)

packages/core/modules-sdk/src/medusa-app.ts

@@ -1,4 +1,3 @@
-import type { Knex } from "knex"
 import { mergeTypeDefs } from "@graphql-tools/merge"
 import { makeExecutableSchema } from "@graphql-tools/schema"
 import { RemoteFetchDataCallback } from "@medusajs/orchestration"
@@ -26,12 +25,13 @@ import {
   promiseAll,
 } from "@medusajs/utils"
 import { asValue } from "awilix"
+import type { Knex } from "knex"
 import {
   MODULE_PACKAGE_NAMES,
   ModuleRegistrationName,
   Modules,
 } from "./definitions"
-import { MedusaModule } from "./medusa-module"
+import { MedusaModule, RegisterModuleJoinerConfig } from "./medusa-module"
 import { RemoteLink } from "./remote-link"
 import { RemoteQuery } from "./remote-query"
 import { MODULE_RESOURCE_TYPE, MODULE_SCOPE } from "./types"
@@ -240,7 +240,7 @@ export type MedusaAppOptions = {
   modulesConfigPath?: string
   modulesConfigFileName?: string
   modulesConfig?: MedusaModuleConfig
-  linkModules?: ModuleJoinerConfig | ModuleJoinerConfig[]
+  linkModules?: RegisterModuleJoinerConfig | RegisterModuleJoinerConfig[]
   remoteFetchData?: RemoteFetchDataCallback
   injectedDependencies?: any
   onApplicationStartCb?: () => void
@@ -260,7 +260,6 @@ async function MedusaApp_({
   linkModules,
   remoteFetchData,
   injectedDependencies = {},
-  onApplicationStartCb,
   migrationOnly = false,
   loaderOnly = false,
   workerMode = "server",
@@ -363,6 +362,20 @@ async function MedusaApp_({
       allowUnregistered: true,
     })
 
+  linkModules ??= []
+  if (!Array.isArray(linkModules)) {
+    linkModules = [linkModules]
+  }
+  linkModules.push(...MedusaModule.getCustomLinks())
+
+  const allLoadedJoinerConfigs = MedusaModule.getAllJoinerConfigs()
+  for (let linkIdx = 0; linkIdx < linkModules.length; linkIdx++) {
+    const customLink: any = linkModules[linkIdx]
+    if (typeof customLink === "function") {
+      linkModules[linkIdx] = customLink(allLoadedJoinerConfigs)
+    }
+  }
+
   const {
     remoteLink,
     runMigrations: linkModuleMigration,