Oh... It is really amazing when start using React with Typescript. It is giving more effectiveness in development (my opinion).
Anyone can find free APIs for getting the covid19 details.
I referred this one for COVID-19 details: https://disease.sh/
I used to React Leaflet for showing the map. It is the first time I am using this library. https://react-leaflet.js.org/
Also used the Chart.js for showing the Line graph.
I don't think it is 100% perfect. But I will try to improve.
Feel free to make suggestions on the application and code.