From 0f4d6497c8e9f1287fac5b6224aff6be112d5e83 Mon Sep 17 00:00:00 2001
From: qiang <guoshengqiang@live.com>
Date: Mon, 15 Aug 2022 16:47:36 +0800
Subject: [PATCH] fix(mp): clone babelLoader and options for main.js

---
 packages/webpack-uni-mp-loader/lib/main-new.js | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/packages/webpack-uni-mp-loader/lib/main-new.js b/packages/webpack-uni-mp-loader/lib/main-new.js
index db7088e2d..15b7c48dd 100644
--- a/packages/webpack-uni-mp-loader/lib/main-new.js
+++ b/packages/webpack-uni-mp-loader/lib/main-new.js
@@ -96,12 +96,21 @@ createPage(Page)
       components: []
     })
 
-    const babelLoader = findBabelLoader(this.loaders)
+    let babelLoader = findBabelLoader(this.loaders)
     if (!babelLoader) {
       throw new Error(uniI18n.__('mpLoader.findFail', {
         0: 'babel-loader'
       }))
     } else {
+      const webpack = require('webpack')
+      if (webpack.version[0] > 4) {
+        // clone babelLoader and options
+        const index = this.loaders.indexOf(babelLoader)
+        const newBabelLoader = Object.assign({}, babelLoader)
+        Object.assign(newBabelLoader, { options: Object.assign({}, babelLoader.options) })
+        this.loaders.splice(index, 1, newBabelLoader)
+        babelLoader = newBabelLoader
+      }
       addCreateApp(babelLoader)
     }
 
@@ -147,4 +156,4 @@ createPage(Page)
       callback(err, content, map)
     })
   }
-}
+}
-- 
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