text: var os = require('os');
  var osRelease = parseFloat(os.release());
  
  if (osRelease < 13  ) {
    module.exports = require('./legacy');
  } else if (osRelease < 14) {
    module.exports = require('./mavericks');
  } else if (osRelease < 17) {
    module.exports = require('./yosemite');
  } else if (osRelease < 18) {
    module.exports = require('./highsierra');
  } else if(osRelease < 19) {
    module.exports = require('./mojave');
  }else {
    module.exports = require("./catalina");
  }
  