diff --git a/packages/vant-cli/src/compiler/compile-script.ts b/packages/vant-cli/src/compiler/compile-script.ts
index d77a56acd..ca1dd95b0 100644
--- a/packages/vant-cli/src/compiler/compile-script.ts
+++ b/packages/vant-cli/src/compiler/compile-script.ts
@@ -2,7 +2,7 @@ import fse from 'fs-extra';
 import babel from '@babel/core';
 import esbuild, { type Format } from 'esbuild';
 import { sep } from 'path';
-import { isJsx, replaceExt } from '../common/index.js';
+import { isJsx, replaceExt, getVantConfig } from '../common/index.js';
 import { replaceCSSImportExt } from '../common/css.js';
 import { replaceScriptImportExt } from './get-deps.js';
 
@@ -50,7 +50,9 @@ export async function compileScript(
 
   ({ code } = esbuildResult);
 
-  const jsFilePath = replaceExt(filePath, '.js');
+  const extensionMap = getVantConfig().build?.extensions;
+  const extension = extensionMap?.[format] || '.js';
+  const jsFilePath = replaceExt(filePath, extension);
   removeSync(filePath);
   outputFileSync(jsFilePath, code);
 }
diff --git a/packages/vant-cli/src/config/vite.package.ts b/packages/vant-cli/src/config/vite.package.ts
index 7c780e3b4..4d6f35469 100644
--- a/packages/vant-cli/src/config/vite.package.ts
+++ b/packages/vant-cli/src/config/vite.package.ts
@@ -14,7 +14,9 @@ export function getViteConfigForPackage({
 }): InlineConfig {
   setBuildTarget('package');
 
-  const { name } = getVantConfig();
+  const { name, build } = getVantConfig();
+  const entryExtension = build?.extensions?.esm || '.js';
+  const entry = join(ES_DIR, `index${entryExtension}`);
 
   return {
     root: CWD,
@@ -24,7 +26,7 @@ export function getViteConfigForPackage({
     build: {
       lib: {
         name,
-        entry: join(ES_DIR, 'index.js'),
+        entry,
         formats,
         fileName: (format: string) => {
           const suffix = format === 'umd' ? '' : `.${format}`;