diff --git a/.gitignore b/.gitignore
index 9b598cbc..7ce8c006 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,6 @@
 coverage
 demo/markdown-it.min.js
 demo/markdownlint-browser.min.js
-demo/markdownlint-browser.min.js.LICENSE.txt
 demo/markdownlint-rule-helpers-browser.*
 node_modules
 !test/node_modules
diff --git a/demo/webpack.config.js b/demo/webpack.config.js
index a09e202e..9c09b122 100644
--- a/demo/webpack.config.js
+++ b/demo/webpack.config.js
@@ -3,10 +3,11 @@
 "use strict";
 
 const webpack = require("webpack");
+const TerserPlugin = require("terser-webpack-plugin");
 const nodeModulePrefixRe = /^node:/u;
 
 function config(options) {
-  const { entry, filename, mode, packageJson } = options;
+  const { entry, filename, mode, optimization, packageJson } = options;
   const { name, version, homepage, license } = packageJson;
   return {
     "devtool": false,
@@ -32,6 +33,7 @@ function config(options) {
       ]
     },
     "name": name,
+    "optimization": optimization,
     "output": {
       "filename": filename,
       "library": name.replace(/(-\w)/g, (m) => m.slice(1).toUpperCase()),
@@ -60,29 +62,51 @@ function config(options) {
   };
 }
 
+const modeDevelopment = {
+  "mode": "development"
+};
+const modeProduction = {
+  "mode": "production",
+  "optimization": {
+    "minimizer": [
+      new TerserPlugin({
+        "extractComments": false,
+        "terserOptions": {
+          "compress": {
+            "passes": 2
+          }
+        }
+      })
+    ]
+  }
+};
+const entryLibrary = {
+  "entry": "../lib/markdownlint.js",
+  "packageJson": require("../package.json")
+};
+const entryHelpers = {
+  "entry": "../helpers/helpers.js",
+  "packageJson": require("../helpers/package.json")
+};
 module.exports = [
   config({
-    "entry": "../lib/markdownlint.js",
-    "filename": "markdownlint-browser.js",
-    "mode": "development",
-    "packageJson": require("../package.json")
+    ...entryLibrary,
+    ...modeDevelopment,
+    "filename": "markdownlint-browser.js"
   }),
   config({
-    "entry": "../lib/markdownlint.js",
-    "filename": "markdownlint-browser.min.js",
-    "mode": "production",
-    "packageJson": require("../package.json")
+    ...entryLibrary,
+    ...modeProduction,
+    "filename": "markdownlint-browser.min.js"
   }),
   config({
-    "entry": "../helpers/helpers.js",
-    "filename": "markdownlint-rule-helpers-browser.js",
-    "mode": "development",
-    "packageJson": require("../helpers/package.json")
+    ...entryHelpers,
+    ...modeDevelopment,
+    "filename": "markdownlint-rule-helpers-browser.js"
   }),
   config({
-    "entry": "../helpers/helpers.js",
-    "filename": "markdownlint-rule-helpers-browser.min.js",
-    "mode": "production",
-    "packageJson": require("../helpers/package.json")
+    ...entryHelpers,
+    ...modeProduction,
+    "filename": "markdownlint-rule-helpers-browser.min.js"
   })
 ];
diff --git a/package.json b/package.json
index ed6d3808..ede7f40f 100644
--- a/package.json
+++ b/package.json
@@ -73,6 +73,7 @@
     "markdownlint-rule-helpers": "0.17.2",
     "npm-run-all": "4.1.5",
     "strip-json-comments": "5.0.0",
+    "terser-webpack-plugin": "5.3.5",
     "toml": "3.0.0",
     "ts-loader": "9.3.1",
     "tv4": "1.3.0",