fix: add return obj to build func

src/index.ts

@@ -1,21 +1,20 @@
 import {
-  BuildOptions,
   download,
   getNodeVersion,
   getSpawnOptions,
+  BuildV2,
 } from '@vercel/build-utils';
 import path from 'path';
 import { getConfig } from './config';
 import { getMountPoint } from './utils';
 import { npmBuild } from './npm';
-
-export async function build({
+export const build: BuildV2 = async ({
   files,
   entrypoint,
   workPath,
   config: rawConfig,
   meta = {},
-}: BuildOptions) {
+}) => {
   try {
     const mountpoint = getMountPoint(entrypoint);
     const entrypointDir = path.join(workPath, mountpoint);
@@ -26,9 +25,23 @@ export async function build({
     const config = getConfig(rawConfig);
     const nodeVersion = await getNodeVersion(entrypointDir, undefined, config);
     const spawnOpts = getSpawnOptions(meta, nodeVersion);
-    await npmBuild(config, entrypointDir, spawnOpts, meta);
+    const outputPath = await npmBuild(config, entrypointDir, spawnOpts, meta);
+    console.log('build finished,the output path is:', outputPath);
+
+    const routes = [
+      {
+        src: '/(.*)',
+        dest: '/',
+      },
+    ];
+    return {
+      buildOutputVersion: 3,
+      buildOutputPath: outputPath,
+      routes,
+    };
   } catch (error: any) {
     console.error('build err ===> ', error);
     console.error('build config ===> ', rawConfig);
+    throw error;
   }
-}
+};

src/npm.ts

@@ -17,4 +17,5 @@ export async function npmBuild(
     spawnOpts,
     meta
   );
+  return distDir;
 }