chore: check es5

build/webpack.prod.js

@@ -0,0 +1,23 @@
+const webpack = require('webpack')
+const TerserPlugin = require('terser-webpack-plugin')
+
+exports = require('./webpack.base')
+
+exports.mode = 'production'
+exports.output.filename = 'eruda.js'
+exports.devtool = 'source-map'
+exports.plugins = exports.plugins.concat([
+  new webpack.DefinePlugin({
+    ENV: '"production"',
+  }),
+])
+exports.optimization = {
+  minimize: true,
+  minimizer: [
+    new TerserPlugin({
+      extractComments: false,
+    }),
+  ],
+}
+
+module.exports = exports