1. Install https://www.npmjs.com/package/npm-watch
2. Add this to packages json
"watch": { "build-my-app": { "patterns": [ "src" ], "extensions": "js,vue" } }, "scripts": { "build": "rollup -c", "build-my-app": "npm run build", "watch": "npm-watch" },
3. Start watching with
npm run watch