兼容@vue/cli-plugin-babel@4

packages/vue-cli-plugin-uni/lib/configure-webpack.js

@@ -159,7 +159,7 @@ module.exports = function configureWebpack (platformOptions, manifestPlatformOpt
     }
 
     // js preprocess
-    updateJsLoader(rawRules, 'foo.js', /^babel-loader/, {
+    updateJsLoader(rawRules, 'foo.js', /^(.*[/\\])?babel-loader/, {
       loader: resolve('packages/webpack-preprocess-loader'),
       options: jsPreprocessOptions
     })
@@ -264,4 +264,4 @@ module.exports = function configureWebpack (platformOptions, manifestPlatformOpt
       }
     }, platformWebpackConfig)
   }
-}
+}