Instalamos 📦 parcel como dependencia de desarrollo para poder hacer build de nuestro widget facilmente.

npm install -D parcel

Usaremos Parcel en lugar de la configuracion de webpack por defecto que usa create-react-app a la hora de hacer un build para obtener un solo archivo js con todo lo necesario, mas facil de integrar como widget.

Creamos nuestro widget con Parcel añadiendo un nuevo script al package.json donde le indicamos que lo construya en la carpeta /deploy:

"widget": "parcel build src/index.js --no-source-maps --dist-dir deploy"

Integramos el widget en nuestra web en produccion asi:

<script defer src="./app.js"></script>
<div id="root"></div>

Podemos personalizar el id de enganche de nuestra web <div id="root"></div> cambiandolo también en nuestro index.js:

ReactDOM.render(
  <React.StrictMode>
    <AppInfoNutrition />
  </React.StrictMode>,
  document.getElementById('info_calculadora')
)

This project was bootstrapped with Create React App.

In the project directory, you can run:

Runs the app in the development mode.
Open http://localhost:3000 to view it in your browser.

The page will reload when you make changes.
You may also see any lint errors in the console.

Launches the test runner in the interactive watch mode.
See the section about running tests for more information.

Builds the app for production to the build folder.
It correctly bundles React in production mode and optimizes the build for the best performance.

The build is minified and the filenames include the hashes.
Your app is ready to be deployed!

See the section about deployment for more information.

Note: this is a one-way operation. Once you eject, you can't go back!

If you aren't satisfied with the build tool and configuration choices, you can eject at any time. This command will remove the single build dependency from your project.

Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except eject will still work, but they will point to the copied scripts so you can tweak them. At this point you're on your own.

You don't have to ever use eject. The curated feature set is suitable for small and middle deployments, and you shouldn't feel obligated to use this feature. However we understand that this tool wouldn't be useful if you couldn't customize it when you are ready for it.

You can learn more in the Create React App documentation.

To learn React, check out the React documentation.

This section has moved here: https://facebook.github.io/create-react-app/docs/code-splitting

This section has moved here: https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size

This section has moved here: https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app

This section has moved here: https://facebook.github.io/create-react-app/docs/advanced-configuration

This section has moved here: https://facebook.github.io/create-react-app/docs/deployment

This section has moved here: https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify