add broken rollup build

rollup.config.js

@@ -0,0 +1,18 @@
+module.exports = {
+  input: "./src/index.js",
+  output: {format: "cjs", file: "dist/tiptap.min.js"},
+  sourcemap: true,
+  plugins: [
+		// require("rollup-plugin-buble")(),
+		// require('rollup-plugin-commonjs')(),
+		require('rollup-plugin-babel')({
+			babelrc: false,
+			presets: [['@babel/preset-env', { modules: false }]]
+		}),
+		require('rollup-plugin-node-resolve')()
+	],
+	buble: {
+    objectAssign: 'Object.assign'
+  },
+  external(id) { return !/^[\.\/]/.test(id) }
+}