const Prism = require('prismjs');
const loadLanguages = require('prismjs/components/');

loadLanguages(['csharp']);
Prism.plugins =  "line-numbers" ;

const code = 'using System';
const html = Prism.highlight(code, Prism.languages.csharp, 'csharp');
console.log(html);
console.log('done');