feat(admin, admin-ui, medusa-js, medusa-react, medusa): Support Admin Extensions (#4761)

Co-authored-by: Rares Stefan <948623+StephixOne@users.noreply.github.com>
Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

packages/admin/src/utils/get-plugin-paths.ts

@@ -0,0 +1,42 @@
+import { logger } from "@medusajs/admin-ui"
+import type { ConfigModule } from "@medusajs/medusa"
+import { getConfigFile } from "medusa-core-utils"
+import path from "path"
+
+function hasEnabledUI(options: Record<string, unknown>) {
+  return "enableUI" in options && options.enableUI === true
+}
+
+export async function getPluginPaths() {
+  const { configModule, error } = getConfigFile<ConfigModule>(
+    path.resolve(process.cwd()),
+    "medusa-config.js"
+  )
+
+  if (error) {
+    logger.panic("Error loading `medusa-config.js`")
+  }
+
+  const plugins = configModule.plugins || []
+
+  const paths: string[] = []
+
+  for (const p of plugins) {
+    if (typeof p === "string") {
+      continue
+    } else {
+      const options = p.options || {}
+
+      /**
+       * While the feature is in beta, we only want to load plugins that have
+       * enabled the UI explicitly. In the future, we will flip this check so
+       * we only exclude plugins that have set `enableUI` to false.
+       */
+      if (hasEnabledUI(options)) {
+        paths.push(p.resolve)
+      }
+    }
+  }
+
+  return paths
+}