Node Module Integration

Use multiple third-party NPM modules as dependencies in a NiceGUI app.

The app uses the is-odd node modules to check if a number is even or odd. We chose this package to demonstrate a very simple node module which has a dependency itself, namely the is-number package. Using NPM, we can easily install both packages and bundle them into a single file which can be used in the app. The package.json file defines the is-odd dependency and some dev dependencies for bundling the node module, the rollup.config.mjs file configures the bundling process, the src/index.mjs file is the entry point for the node module, and number_checker.js as well as number_checker.py define a new UI element to be used in the NiceGUI app main.py.

First, install all third-party node modules (assuming you have NPM installed):
bash
```
npm install
```
This will create a node_modules directory containing the is-odd and is-number modules as well as some dev dependencies.
Now bundle the node module:
bash
```
npm run build
```
This will create a dist directory containing the is-odd module.
Finally, you can run the app as usual:
bash
```
python3 main.py
```