[Build] webpack5 upgrade (#4242)

webpack.prod.js

@@ -0,0 +1,20 @@
+const { merge } = require('webpack-merge');
+const common = require('./webpack.common');
+
+const path = require('path');
+const webpack = require('webpack');
+
+module.exports = merge(common, {
+    mode: 'production',
+    resolve: {
+        alias: {
+            "vue": path.join(__dirname, "node_modules/vue/dist/vue.min.js")
+        }
+    },
+    plugins: [
+        new webpack.DefinePlugin({
+            __OPENMCT_ROOT_RELATIVE__: '""'
+        })
+    ],
+    devtool: 'source-map'
+});