part-1-step-3.js

driver.manage().window().setSize(1280, 1280);
driver.get('http://wesleyhales.com').then(function() {
    
  driver.wait(function () {
      return driver.executeScript('' +
        'if(performance.getEntriesByType("resource").length > 0){return performance.getEntriesByType("resource")}else{return false}' +
        '').then(function (return_value) {
        if(return_value){
          console.log(return_value);
          return true;
        }else{
          return return_value;
        }
      });
    }, 5000, '\n Timeout.').catch(function(e){
        console.log('*** resource timeout error: ' + e);
    }).then(null, function (err) {
      if (err)
        console.log('*** resource detection error: ' + err);
    });

  driver.
    takeScreenshot().
      catch(function(e){
        console.log('*** Screenshot error: ' + e);
      }).then(
      function(image, err) {
        fs.writeFile('example.png', image, 'base64', function(err) {
          console.log('Screenshot has been created.');
        });
      }
  );

  driver.close();
});