Here the code where I use it:

import React from 'react';

export default function CurrentWeather(){
    const options = {
        key: 'M7pQnMBwZaBGVpdBNtqLe6R2DlxTAcmC', // REPLACE WITH YOUR KEY !!!
        lat: 50.4,
        lon: 14.3,
        zoom: 1,
    };
    // eslint-disable-next-line no-undef
    windyInit(options, windyAPI => {

        const { map } = windyAPI;
    });

    return <div>;
}
```</div>