From 7b1e90afa39a2b8cbafde50d8ffa3aa4a22a4210 Mon Sep 17 00:00:00 2001
From: Duo Duo <l-duoduo@qq.com>
Date: Wed, 9 Dec 2020 16:03:22 +0800
Subject: [PATCH] fix: make ssr-build-plugin compatible with webpack4/5 (fix
 #11718)

---
 src/server/template-renderer/index.js | 4 ++--
 src/server/webpack-plugin/server.js   | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/server/template-renderer/index.js b/src/server/template-renderer/index.js
index c8927b2de2c..ea8585c571d 100644
--- a/src/server/template-renderer/index.js
+++ b/src/server/template-renderer/index.js
@@ -55,7 +55,7 @@ export default class TemplateRenderer {
     this.inject = options.inject !== false
     // if no template option is provided, the renderer is created
     // as a utility object for rendering assets like preload links and scripts.
-    
+
     const { template } = options
     this.parsedTemplate = template
       ? typeof template === 'string'
@@ -224,7 +224,7 @@ export default class TemplateRenderer {
     if (this.clientManifest) {
       const initial = this.preloadFiles.filter(({ file }) => isJS(file))
       const async = (this.getUsedAsyncFiles(context) || []).filter(({ file }) => isJS(file))
-      const needed = [initial[0]].concat(async, initial.slice(1))
+      const needed = [].concat(initial[0] ? [initial[0]] : [], async, initial.slice(1));
       return needed.map(({ file }) => {
         return `<script src="${this.publicPath}${file}" defer></script>`
       }).join('')
diff --git a/src/server/webpack-plugin/server.js b/src/server/webpack-plugin/server.js
index ccd68fc86e1..ccb9cdd9624 100644
--- a/src/server/webpack-plugin/server.js
+++ b/src/server/webpack-plugin/server.js
@@ -59,6 +59,9 @@ export default class VueSSRServerPlugin {
       stats.assets.forEach(asset => {
         if (isJS(asset.name)) {
           bundle.files[asset.name] = compilation.assets[asset.name].source()
+          if (asset.info && asset.info.related && asset.info.related.sourceMap) {
+            bundle.maps[asset.info.related.sourceMap.replace(/\.map$/, '')] = JSON.parse(compilation.assets[asset.info.related.sourceMap].source());
+          }
         } else if (asset.name.match(/\.js\.map$/)) {
           bundle.maps[asset.name.replace(/\.map$/, '')] = JSON.parse(compilation.assets[asset.name].source())
         }