text: const UglifyJS = require('uglify-es');
  const CleanCSS = require('clean-css');
  const fs = require('fs');
  
  try {
      const jsSource = fs.readFileSync('./src/fisarmonica.js', 'UTF-8');
      const jsMinified = UglifyJS.minify(jsSource);
      if (jsMinified.error) {
          console.log('js minify error', jsMinified.error);
          process.exit();
      }
      const cssSource = fs.readFileSync('./src/fisarmonica.css', 'UTF-8');
      const cssMinified = new CleanCSS().minify(cssSource);
      fs.writeFileSync('./dist/fisarmonica.min.js', jsMinified.code, 'UTF-8');
      fs.writeFileSync('./dist/fisarmonica.min.css', cssMinified.styles, 'UTF-8');
      console.log('All files minified!');
  } catch (err) {
      console.log('Minify error', err);
      process.exit();
  }
  