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I'm using Cucumber and Protractor with Node.js to test my web application. I use javascript to write code with chai expectation. I need to write some results in a separate text file. How can I do it? I need the result in the text file because, I analize the result in the excel. The code is that:

When('I insert the related username and password to access it', timeout: 90*1000, function (next) 
 let username_field = element(by.css('.UsernameInput'));
 browser.wait(until.presenceOf(username_field), 1200000, 'Element taking too long to appear in the DOM');
 let username_password = element(by.css('.PasswordInput'));
 browser.wait(until.presenceOf(username_password), 1200000, 'Element taking too long to appear in the DOM');
 const fs = require('fs'); 
 const userFile = fs.readFileSync('parametri.txt', encoding: 'utf8'); 
 const users = userFile.split('n');
 const randomUser = () => 
 const number = Math.floor(Math.random() * Math.floor(users.length - 1));
 const user = users[number].split(',');
 return username: user[0], password: user[1]
 
 const user = randomUser(); 
 username_field.sendKeys(user.username);
 username_password.sendKeys(user.password);
 username_field.getText().then(function(text)
 var n=new Date();
 var time= n.getTime();
 browser.sleep(d);
 console.log(time);
 console.log('1°When');
 function WriteFile() 
 const feat1_stepUno = require('feat1_stepUno');
 let a= '5000';
 const file_time = feat1_stepUno.writeFile('tempo.txt',a,(err) => 
 if (err) throw err; 
 ) 

 
expect(username_field.isPresent()).to.eventually.be.true.and.notify(next); 
 )
);

Thank you so much for your help!

This can solve your issue:

const fs = require('fs');
fs.writeFile("tempo.txt", "Hey there!", function(err) 
 if(err) 
 return console.log(err);
 

 console.log("The file was saved!");
); 

Bye!