build: replace webpack with rollup in order to optimize bundle

Save devDependencies:

* rollup@1.16.2
* rollup-plugin-commonjs@10.0.0
* rollup-plugin-node-resolve@5.0.4
* rollup-plugin-uglify@6.0.2

Remove `webpack.config.js` and add `rollup.config.js`

Update npm scripts `build:min` and `build:unmin`

Author: remarkablemark

package.json

@@ -7,8 +7,8 @@
   "scripts": {
     "benchmark": "node benchmark",
     "build": "npm run clean && npm run build:min && npm run build:unmin",
-    "build:min": "cross-env NODE_ENV=production webpack --output-filename html-react-parser.min.js",
-    "build:unmin": "cross-env NODE_ENV=development webpack --output-filename html-react-parser.js",
+    "build:min": "cross-env NODE_ENV=production rollup --config --file dist/html-react-parser.min.js --sourcemap",
+    "build:unmin": "cross-env NODE_ENV=development rollup --config --file dist/html-react-parser.js",
     "clean": "rimraf dist",
     "coveralls": "nyc report --reporter=text-lcov | coveralls",
     "lint": "eslint --ignore-path .gitignore .",
@@ -58,9 +58,11 @@
     "react": "^16",
     "react-dom": "^16",
     "rimraf": "^2.6.3",
-    "standard-version": "^6.0.1",
-    "webpack": "^4.35.0",
-    "webpack-cli": "^3.3.5"
+    "rollup": "^1.16.2",
+    "rollup-plugin-commonjs": "^10.0.0",
+    "rollup-plugin-node-resolve": "^5.0.4",
+    "rollup-plugin-uglify": "^6.0.2",
+    "standard-version": "^6.0.1"
   },
   "peerDependencies": {
     "react": "^0.14 || ^15 || ^16"

rollup.config.js

@@ -0,0 +1,22 @@
+import commonjs from 'rollup-plugin-commonjs';
+import resolve from 'rollup-plugin-node-resolve';
+import { uglify } from 'rollup-plugin-uglify';
+
+const config = {
+  external: ['react'],
+  input: 'index.js',
+  output: {
+    format: 'umd',
+    globals: {
+      react: 'React'
+    },
+    name: 'HTMLReactParser'
+  },
+  plugins: [commonjs(), resolve({ browser: true })]
+};
+
+if (process.env.NODE_ENV === 'production') {
+  config.plugins.push(uglify());
+}
+
+export default config;