read-question-from-stdio.js

const readline = require('readline');

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

rl.question(`Do a thing? (Y/n) `, answer => {
  if (!answer || answer.trim().toLowerCase() === 'y') {
    // do something
    rl.close();
  } else {
    // do something else
    rl.close();
    process.exit(1);
  }
});