fix: Create separate CJS and UMD builds (#2281)

package.json

@@ -6,7 +6,7 @@
   "type": "module",
   "main": "./lib/marked.cjs",
   "module": "./lib/marked.esm.js",
-  "browser": "./lib/marked.cjs",
+  "browser": "./lib/marked.umd.js",
   "bin": {
     "marked": "bin/marked.js"
   },

rollup.config.js

@@ -2,10 +2,10 @@ const commonjs = require('@rollup/plugin-commonjs');
 const babel = require('@rollup/plugin-babel').default;
 const license = require('rollup-plugin-license');
 
-module.exports = {
+module.exports = [{
   input: 'src/marked.js',
   output: {
-    file: 'lib/marked.cjs',
+    file: 'lib/marked.umd.js',
     format: 'umd',
     name: 'marked'
   },
@@ -28,4 +28,31 @@ https://github.com/markedjs/marked
       presets: [['@babel/preset-env', { loose: true }]]
     })
   ]
-};
+},
+{
+  input: 'src/marked.js',
+  output: {
+    file: 'lib/marked.cjs',
+    format: 'cjs',
+    name: 'marked'
+  },
+  plugins: [
+    license({
+      banner: `
+DO NOT EDIT THIS FILE
+The code in this file is generated from files in ./src/
+`
+    }),
+    license({
+      banner: `
+marked - a markdown parser
+Copyright (c) 2011-${new Date().getFullYear()}, Christopher Jeffrey. (MIT Licensed)
+https://github.com/markedjs/marked
+`
+    }),
+    commonjs(),
+    babel({
+      presets: [['@babel/preset-env', { loose: true }]]
+    })
+  ]
+}];