feat(admin,admin-ui,medusa): Add Medusa Admin plugin (#3334)

packages/admin-ui/vite.config.dev.ts

@@ -0,0 +1,26 @@
+/// <reference types="vitest" />
+import react from "@vitejs/plugin-react"
+import dns from "dns"
+import { defineConfig } from "vite"
+
+// Resolve localhost for Node v16 and older.
+// @see https://vitejs.dev/config/server-options.html#server-host.
+dns.setDefaultResultOrder("verbatim")
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    environment: "jsdom",
+    globals: true,
+    setupFiles: ["/test/setup.ts"],
+  },
+  root: "ui",
+  define: {
+    __BASE__: JSON.stringify("/"),
+    __MEDUSA_BACKEND_URL__: JSON.stringify("http://localhost:9000"),
+  },
+  build: {
+    outDir: "preview",
+  },
+})