Node.js synchronous prompt

Since Node.js 8, you can do the following using async/await:

const readline = require('readline');

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

function readLineAsync(message) {
  return new Promise((resolve, reject) => {
    rl.question(message, (answer) => {
      resolve(answer);
    });
  });
} 

// Leverages Node.js' awesome async/await functionality
async function demoSynchronousPrompt() {
  var promptInput = await readLineAsync("Give me some input >");
  console.log("Won't be executed until promptInput is received", promptInput);
  rl.close();
}

With flatiron's prompt library, unfortunately, there is no way to have the code blocking. However, I might suggest my own sync-prompt library. Like the name implies, it allows you to synchronously prompt users for input.

With it, you'd simply issue a function call, and get back the user's command line input:

var prompt = require('sync-prompt').prompt;

var name = prompt('What is your name? ');
// User enters "Mike".

console.log('Hello, ' + name + '!');
// -> Hello, Mike!

var hidden = true;
var password = prompt('Password: ', hidden);
// User enters a password, but nothing will be written to the screen.

So give it a try, if you'd like.

Bear in mind: DO NOT use this on web applications. It should only be used on command line applications.

Update: DO NOT USE THIS LIBRARY AT ALL. IT IS A TOTAL JOKE, TO BE PERFECTLY FRANK.

Since IO in Node doesn't block, you're not going to find an easy way to make something like this synchronous. Instead, you should move the code into the callback:

  ...

  prompt.get(property, function (err, result) {               
    if(result === 'no'){
        console.log('Annullato!');
        process.exit(0);
    }

    console.log("creating ", toCreate);
    console.log('\nAll done, exiting'.green.inverse);
  });

or else extract it and call the extracted function:

  ...

  prompt.get(property, function (err, result) {               
    if(result === 'no'){
        console.log('Annullato!');
        process.exit(0);
    } else {
        doCreate();
    }
  });

  ...

function doCreate() {
    console.log("creating ", toCreate);
    console.log('\nAll done, exiting'.green.inverse);
}