chore: Allow modules to discover resources from ts/js and local directories (#7520)

**What**
Update the module resources discovery to account to the source directory to look into.

example:
```ts
user: { resolve: 'user' }
```
The above config will load the resources from the resolved path looking from the node modules
```ts
user: { resolve: './modules/user' }
```
The above config will load the resources from the local directory under dist if not run with ts node and under src otherwise

packages/core/modules-sdk/src/loaders/register-modules.ts

@@ -5,6 +5,8 @@ import {
   ModuleExports,
   ModuleResolution,
 } from "@medusajs/types"
+import { join } from "path"
+
 import { isObject, isString } from "@medusajs/utils"
 import resolveCwd from "resolve-cwd"
 import { ModulesDefinition } from "../definitions"
@@ -56,13 +58,33 @@ export const registerMedusaModule = (
   return moduleResolutions
 }
 
+function normalizePath(path: string | undefined): string {
+  let normalizePath = path
+
+  /**
+   * If the project is running on ts-node all relative module resolution
+   * will target the src directory and otherwise the dist directory.
+   * If the path is not relative, then we can safely import from it and let the resolution
+   * happen under the hood.
+   */
+  if (normalizePath?.startsWith("./")) {
+    const sourceDir = process[Symbol.for("ts-node.register.instance")]
+      ? "src"
+      : "dist"
+    normalizePath = join(process.cwd(), sourceDir, normalizePath)
+  }
+
+  return normalizePath ?? ""
+}
+
 function getCustomModuleResolution(
   key: string,
   moduleConfig: InternalModuleDeclaration | string
 ): ModuleResolution {
-  const resolutionPath = resolveCwd(
-    isString(moduleConfig) ? moduleConfig : (moduleConfig.resolve as string)
+  const originalPath = normalizePath(
+    (isString(moduleConfig) ? moduleConfig : moduleConfig.resolve) as string
   )
+  const resolutionPath = resolveCwd(originalPath)
 
   const conf = isObject(moduleConfig)
     ? moduleConfig
@@ -135,9 +157,10 @@ function getInternalModuleResolution(
   // If user added a module and it's overridable, we resolve that instead
   const isStr = isString(moduleConfig)
   if (isStr || (isObj && moduleConfig.resolve)) {
-    resolutionPath = resolveCwd(
-      isStr ? moduleConfig : (moduleConfig.resolve as string)
+    const originalPath = normalizePath(
+      (isString(moduleConfig) ? moduleConfig : moduleConfig.resolve) as string
     )
+    resolutionPath = resolveCwd(originalPath)
   }
 
   const moduleDeclaration = isObj ? moduleConfig : {}

packages/core/modules-sdk/src/loaders/utils/load-internal.ts

@@ -208,9 +208,17 @@ export async function loadModuleMigrations(
 async function importAllFromDir(path: string) {
   let filesToLoad: string[] = []
 
+  const excludedExtensions = [".ts.map", ".js.map", ".d.ts"]
+
   await readdir(path).then((files) => {
     files.forEach((file) => {
-      if (file !== "index.js" && file.endsWith(".js")) {
+      if (
+        file.startsWith("index.") ||
+        excludedExtensions.some((ext) => file.endsWith(ext))
+      ) {
+        return
+      }
+
       const filePath = join(path, file)
       const stats = statSync(filePath)
 
@@ -219,7 +227,6 @@ async function importAllFromDir(path: string) {
       } else if (stats.isFile()) {
         filesToLoad.push(filePath)
       }
-      }
     })
 
     return filesToLoad
@@ -237,8 +244,10 @@ async function loadResources(
   moduleResolution: ModuleResolution,
   logger: Logger
 ): Promise<ModuleResource> {
-  const modulePath = moduleResolution.resolutionPath as string
-  let normalizedPath = modulePath.replace("index.js", "")
+  let modulePath = moduleResolution.resolutionPath as string
+  let normalizedPath = modulePath
+    .replace("index.js", "")
+    .replace("index.ts", "")
   normalizedPath = resolve(normalizedPath)
 
   try {