chore: cleanup/improve bootstrap (medusajs#14023)

* chore: cleanup/improve bootstrap

* chore: cleanup/improve bootstrap

* Create few-guests-visit.md

Author: adrien2p

.changeset/few-guests-visit.md

@@ -0,0 +1,7 @@
+---
+"@medusajs/medusa": patch
+"@medusajs/framework": patch
+"@medusajs/modules-sdk": patch
+---
+
+chore: cleanup/improve bootstrap

packages/core/framework/src/http/router.ts

@@ -1,4 +1,4 @@
-import { ContainerRegistrationKeys, parseCorsOrigins } from "@medusajs/utils"
+import { ContainerRegistrationKeys, parseCorsOrigins, promiseAll } from "@medusajs/utils"
 import cors, { CorsOptions } from "cors"
 import type { ErrorRequestHandler, Express, RequestHandler } from "express"
 import type {
@@ -85,10 +85,12 @@ export class ApiLoader {
     const routesLoader = new RoutesLoader()
     const middlewareLoader = new MiddlewareFileLoader()
 
-    for (let dir of this.#sourceDirs) {
-      await routesLoader.scanDir(dir)
-      await middlewareLoader.scanDir(dir)
-    }
+    await promiseAll(
+      this.#sourceDirs.flatMap(dir => [
+        routesLoader.scanDir(dir),
+        middlewareLoader.scanDir(dir)
+      ])
+    )
 
     return {
       routes: routesLoader.getRoutes(),

packages/core/modules-sdk/src/loaders/module-loader.ts

@@ -1,4 +1,5 @@
 import { Logger, MedusaContainer, ModuleResolution } from "@medusajs/types"
+import { promiseAll } from "@medusajs/utils"
 import { asValue } from "@medusajs/deps/awilix"
 import { EOL } from "os"
 import { MODULE_SCOPE } from "../types"
@@ -17,23 +18,22 @@ export const moduleLoader = async ({
   migrationOnly?: boolean
   loaderOnly?: boolean
 }): Promise<void> => {
-  for (const resolution of Object.values(moduleResolutions ?? {})) {
-    const registrationResult = await loadModule(
-      container,
-      resolution,
-      logger!,
-      migrationOnly,
-      loaderOnly
+  const resolutions = Object.values(moduleResolutions ?? {})
+  const results = await promiseAll(
+    resolutions.map((resolution) =>
+      loadModule(container, resolution, logger!, migrationOnly, loaderOnly)
     )
+  )
 
+  results.forEach((registrationResult, idx) => {
     if (registrationResult?.error) {
       const { error } = registrationResult
       logger?.error(
-        `Could not resolve module: ${resolution.definition.label}. Error: ${error.message}${EOL}`
+        `Could not resolve module: ${resolutions[idx].definition.label}. Error: ${error.message}${EOL}`
       )
       throw error
     }
-  }
+  })
 }
 
 async function loadModule(

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

@@ -515,25 +515,29 @@ class MedusaModule {
       return [{}]
     }
 
-    for (const {
-      hashKey,
-      modDeclaration,
-      moduleResolutions,
-      container,
-      finishLoading,
-    } of loadedModules) {
-      const service = await MedusaModule.resolveLoadedModule({
+    const resolvedServices = await promiseAll(
+      loadedModules.map(async ({
         hashKey,
         modDeclaration,
         moduleResolutions,
         container,
+        finishLoading,
+      }) => {
+        const service = await MedusaModule.resolveLoadedModule({
+          hashKey,
+          modDeclaration,
+          moduleResolutions,
+          container,
+        })
+
+        MedusaModule.instances_.set(hashKey, service)
+        finishLoading(service)
+        MedusaModule.loading_.delete(hashKey)
+        return service
       })
+    )
 
-      MedusaModule.instances_.set(hashKey, service)
-      finishLoading(service)
-      MedusaModule.loading_.delete(hashKey)
-      services.push(service)
-    }
+    services.push(...resolvedServices)
 
     return services
   }

packages/medusa/src/commands/start.ts

@@ -200,6 +200,8 @@ async function start(args: {
       skipDbConnection: true,
     })
     const logger = container.resolve(ContainerRegistrationKeys.LOGGER)
+    const serverActivity = logger.activity(`Creating server`)
+
     await registerInstrumentation(directory)
 
     const app = express()
@@ -259,8 +261,6 @@ async function start(args: {
         }
       }
 
-      const serverActivity = logger.activity(`Creating server`)
-
       // Register a health check endpoint. Ideally this also checks the readiness of the service, rather than just returning a static response.
       app.get("/health", (_, res) => {
         res.status(200).send("OK")

packages/medusa/src/loaders/index.ts

@@ -92,8 +92,10 @@ async function loadEntrypoints(
   )
 
   if (shouldLoadBackgroundProcessors(configModule)) {
-    await subscribersLoader(plugins, container)
-    await jobsLoader(plugins, container)
+    await promiseAll([
+      subscribersLoader(plugins, container),
+      jobsLoader(plugins, container),
+    ])
   }
 
   if (isWorkerMode(configModule)) {
@@ -119,17 +121,18 @@ async function loadEntrypoints(
     next()
   })
 
-  const { shutdown } = await expressLoader({
-    app: expressApp,
-    container,
-  })
-
-  await adminLoader({ app: expressApp, configModule, rootDirectory, plugins })
-  await apiLoader({
-    container,
-    plugins,
-    app: expressApp,
-  })
+  const [{ shutdown }] = await promiseAll([
+    expressLoader({
+      app: expressApp,
+      container,
+    }),
+    adminLoader({ app: expressApp, configModule, rootDirectory, plugins }),
+    apiLoader({
+      container,
+      plugins,
+      app: expressApp,
+    }),
+  ])
 
   return shutdown
 }
@@ -140,10 +143,8 @@ export async function initializeContainer(
     skipDbConnection?: boolean
   }
 ): Promise<MedusaContainer> {
-  // custom flags from medusa project
   await featureFlagsLoader(rootDirectory)
   const configDir = await configLoader(rootDirectory, "medusa-config")
-  // core flags
   await featureFlagsLoader(join(__dirname, ".."))
 
   const customLogger = configDir.logger ?? defaultLogger