Fix terser-webpack-plugin not found

package.json

@@ -36,6 +36,7 @@
     "prettier": "^2.4.1",
     "sass": "^1.42.1",
     "sinon": "^7.5.0",
+    "terser-webpack-plugin": "^5.3.1",
     "vuepress": "^1.8.2",
     "whatwg-fetch": "^3.6.2"
   },

webpack.config.js

@@ -1,7 +1,7 @@
 import path from 'path';
 import webpack from 'webpack';
 import pkg from './package.json';
-import TerserPlugin from 'grapesjs-cli/node_modules/terser-webpack-plugin';
+import TerserPlugin from 'terser-webpack-plugin';
 
 const rootDir = path.resolve(__dirname);