From e24cad1eeeaa428e94fafec085c467e4a32bb652 Mon Sep 17 00:00:00 2001
From: Binwei Fang <fangbinwei@yeah.net>
Date: Tue, 6 Apr 2021 17:34:51 +0800
Subject: [PATCH] fix(cli-service): respect the existing 'devtool'

Respect the existing 'devtool' when running dev server

Fixes #6398
---
 packages/@vue/cli-service/lib/commands/serve.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/packages/@vue/cli-service/lib/commands/serve.js b/packages/@vue/cli-service/lib/commands/serve.js
index 430096f925..058e4a3e32 100644
--- a/packages/@vue/cli-service/lib/commands/serve.js
+++ b/packages/@vue/cli-service/lib/commands/serve.js
@@ -13,6 +13,7 @@ const defaults = {
   https: false
 }
 
+/** @type {import('@vue/cli-service').ServicePlugin} */
 module.exports = (api, options) => {
   api.registerCommand('serve', {
     description: 'start development server',
@@ -50,8 +51,10 @@ module.exports = (api, options) => {
     // configs that only matters for dev server
     api.chainWebpack(webpackConfig => {
       if (process.env.NODE_ENV !== 'production' && process.env.NODE_ENV !== 'test') {
-        webpackConfig
-          .devtool('eval-cheap-module-source-map')
+        if (!webpackConfig.get('devtool')) {
+          webpackConfig
+            .devtool('eval-cheap-module-source-map')
+        }
 
         webpackConfig
           .plugin('hmr')