update

package.json

@@ -27,7 +27,7 @@
     "@vue/cli-plugin-babel": "3.0.3",
     "@vue/cli-service": "3.0.3",
     "node-sass": "^4.9.3",
-    "sass-loader": "^7.1.0",
+    "sass-loader": "7.1.0",
     "script-ext-html-webpack-plugin": "2.0.1",
     "svg-sprite-loader": "3.8.0",
     "svgo": "1.0.5",

vue.config.js

@@ -1,4 +1,5 @@
 var path = require('path')
+
 function resolve(dir) {
   return path.join(__dirname, './', dir)
 }
@@ -35,5 +36,11 @@ module.exports = {
       .options({
         symbolId: 'icon-[name]'
       })
+      .end()
+
+    config
+      .when(process.env.NODE_ENV === 'development',
+        config => config.devtool('cheap-source-map')
+      )
   }
 }