feat: add support for loading admin extensions from the source

.changeset/neat-lamps-check.md

@@ -0,0 +1,7 @@
+---
+"@medusajs/medusa": patch
+"@medusajs/framework": patch
+"@medusajs/types": patch
+---
+
+feat: add support for loading admin extensions from the source

packages/core/framework/src/build-tools/compiler.ts

@@ -1,7 +1,7 @@
-import type { AdminOptions, ConfigModule, Logger } from "@medusajs/types"
-import { getConfigFile } from "@medusajs/utils"
-import { access, constants, copyFile, rm } from "fs/promises"
 import path from "path"
+import { getConfigFile } from "@medusajs/utils"
+import type { AdminOptions, ConfigModule, Logger } from "@medusajs/types"
+import { rm, access, constants, copyFile, writeFile } from "fs/promises"
 import type tsStatic from "typescript"
 
 /**
@@ -27,6 +27,7 @@ export class Compiler {
   #adminSourceFolder: string
   #pluginsDistFolder: string
   #backendIgnoreFiles: string[]
+  #pluginOptionsPath: string
   #adminOnlyDistFolder: string
   #tsCompiler?: typeof tsStatic
 
@@ -37,6 +38,10 @@ export class Compiler {
     this.#adminSourceFolder = path.join(this.#projectRoot, "src/admin")
     this.#adminOnlyDistFolder = path.join(this.#projectRoot, ".medusa/admin")
     this.#pluginsDistFolder = path.join(this.#projectRoot, ".medusa/server")
+    this.#pluginOptionsPath = path.join(
+      this.#projectRoot,
+      ".medusa/server/medusa-plugin-options.json"
+    )
     this.#backendIgnoreFiles = [
       "integration-tests",
       "test",
@@ -152,6 +157,24 @@ export class Compiler {
     return { configFilePath, configModule }
   }
 
+  /**
+   * Creates medusa-plugin-options.json file that contains some
+   * metadata related to the plugin, which could be helpful
+   * for MedusaJS loaders during development
+   */
+  async #createPluginOptionsFile() {
+    await writeFile(
+      this.#pluginOptionsPath,
+      JSON.stringify(
+        {
+          srcDir: path.join(this.#projectRoot, "src"),
+        },
+        null,
+        2
+      )
+    )
+  }
+
   /**
    * Prints typescript diagnostic messages
    */
@@ -440,6 +463,7 @@ export class Compiler {
    * a file has changed.
    */
   async developPluginBackend(onFileChange?: () => void) {
+    await this.#createPluginOptionsFile()
     const ts = await this.#loadTSCompiler()
 
     /**

packages/core/types/src/common/config-module.ts

@@ -968,6 +968,7 @@ export type InputConfig = Partial<
 
 export type PluginDetails = {
   resolve: string
+  adminResolve: string
   name: string
   id: string
   options: Record<string, unknown>

packages/medusa/src/loaders/admin.ts

@@ -33,12 +33,9 @@ export default async function adminLoader({
   const { admin } = configModule
 
   const sources: string[] = []
-
   for (const plugin of plugins) {
-    const pluginSource = path.join(plugin.resolve, "admin")
-
-    if (fs.existsSync(pluginSource)) {
-      sources.push(pluginSource)
+    if (fs.existsSync(plugin.adminResolve)) {
+      sources.push(plugin.adminResolve)
     }
   }
 

packages/medusa/src/loaders/helpers/resolve-plugins.ts

@@ -5,6 +5,8 @@ import { ConfigModule, PluginDetails } from "@medusajs/framework/types"
 
 const MEDUSA_APP_SOURCE_PATH = "src"
 const MEDUSA_PLUGIN_SOURCE_PATH = ".medusa/server/src"
+const MEDUSA_PLUGIN_OPTIONS_FILE_PATH =
+  ".medusa/server/medusa-plugin-options.json"
 export const MEDUSA_PROJECT_NAME = "project-plugin"
 
 function createPluginId(name: string): string {
@@ -41,6 +43,27 @@ async function resolvePluginPkgFile(
   }
 }
 
+/**
+ * Reads the "medusa-plugin-options.json" file from the plugin root
+ * directory and returns its contents as an object.
+ */
+async function resolvePluginOptions(
+  pluginRootDir: string
+): Promise<Record<string, any>> {
+  try {
+    const contents = await fs.readFile(
+      path.join(pluginRootDir, MEDUSA_PLUGIN_OPTIONS_FILE_PATH),
+      "utf-8"
+    )
+    return JSON.parse(contents)
+  } catch (error) {
+    if (error.code === "MODULE_NOT_FOUND" || error.code === "ENOENT") {
+      return {}
+    }
+    throw error
+  }
+}
+
 /**
  * Finds the correct path for the plugin. If it is a local plugin it will be
  * found in the plugins folder. Otherwise we will look for the plugin in the
@@ -60,6 +83,7 @@ async function resolvePlugin(
   const name = pkgJSON.contents.name || pluginPath
 
   const resolve = path.join(resolvedPath, MEDUSA_PLUGIN_SOURCE_PATH)
+  const pluginStaticOptions = await resolvePluginOptions(resolvedPath)
   const modules = await readDir(path.join(resolve, "modules"), {
     ignoreMissing: true,
   })
@@ -71,6 +95,7 @@ async function resolvePlugin(
     id: createPluginId(name),
     options: pluginOptions,
     version: pkgJSON.contents.version || "0.0.0",
+    adminResolve: path.join(pluginStaticOptions.srcDir ?? resolve, "admin"),
     modules: modules.map((mod) => {
       return {
         resolve: `${pluginPath}/${MEDUSA_PLUGIN_SOURCE_PATH}/modules/${mod.name}`,
@@ -100,6 +125,7 @@ export async function getResolvedPlugins(
       resolve: extensionDirectory,
       name: MEDUSA_PROJECT_NAME,
       id: createPluginId(MEDUSA_PROJECT_NAME),
+      adminResolve: path.join(extensionDirectory, "admin"),
       options: configModule,
       version: createFileContentHash(process.cwd(), `**`),
     })