close to final version added the subtaskand comment working section

server/build.mjs

@@ -0,0 +1,17 @@
+import { build } from 'esbuild';
+import { SpinEsbuildPlugin } from "@spinframework/build-tools/plugins/esbuild/index.js";
+
+const spinPlugin = await SpinEsbuildPlugin();
+
+await build({
+    entryPoints: ['./app_spin.js'],
+    outfile: './dist/spin.js',
+    bundle: true,
+    format: 'esm',
+    platform: 'node',
+    sourcemap: false,
+    minify: false,
+    plugins: [spinPlugin],
+    target: 'es2020',
+    external: ['fermyon:*', 'spin:*'],
+});