소스맵 도구 변경

frontend/webpack.dev.js

@@ -5,6 +5,6 @@ const common = require("./webpack.common.js");
 
 module.exports = merge(common, {
   mode: "development",
-  devtool: "inline-source-map",
+  devtool: "eval-cheap-module-source-map",
   devServer: { historyApiFallback: true },
 });