text: var fs = require('fs');
  var Module = require('module');
  
  var file = require.resolve('esprima');
  var source = fs.readFileSync(file, 'utf-8');
  
  // inject '@' as a valid identifier!
  source = source.replace(/(isIdentifierStart: function \(cp\) {\s+return)/m, '$1 (cp == 0x40) || ');
  
  //If run as script just output patched file
  if (require.main === module)
    console.log(source);
  else {
    var _module = new Module('aesprim');
    _module._compile(source, __filename);
  
    module.exports = _module.exports;
  }
  