content: const fs = require('fs');
  const path = require('path');
  
  const sandboxFilePath = path.resolve(__dirname, '../sandbox.js');
  
  const sandboxStarterContent = `
  import React from 'react';
  import {DefaultButton} from 'pivotal-ui/react/buttons';
  
  export default () => {
    return <DefaultButton>Hello!</DefaultButton>
  };
  `.trim();
  
  if (fs.existsSync(sandboxFilePath)) {
    console.log('Your sandbox.js file already exists!\n\nUse "yarn start" to start the dev server.');
    process.exit();
  } else {
    console.log('Creating "sandbox.js" file...');
  }
  
  fs.writeFileSync(sandboxFilePath, sandboxStarterContent);
  
  console.log('Wrote "sandbox.js"!\n\nUse "yarn start" to start the dev server.');
  