text: const babel = require('@babel/core');
  const plugin = require('./index.js');
  const fs = require('fs');
  
  let file_name = './test_cont.js';
  
  let content = fs.readFileSync(file_name, 'utf-8');
  
  let a = babel.transform(content, {
      plugins: [plugin],
      filename: file_name
  });
  
  console.log(a.code);