JavaScript: number guesser game with Node.js.

app.js

let {testNumber} = require('./game.js');

process.stdout.write("I'm thinking of a number from 1 through 10. What do you think it is? \n(Write \"quit\" to give up.)\n\nIs the number ... ");

let playGame = (userInput) => {
  let input = userInput.toString().trim();
	testNumber(input);
};

process.stdin.on('data', playGame);

game.js

let secretValue = Math.floor(1+Math.random()*10).toString();

let numbers = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10'];

module.exports = {
  testNumber: (input) => {
   if (input === 'quit') {
    process.stdout.write('Ok. Bye!\n')
    process.exit();
  }
  if (!numbers.includes(input)) {
    process.stdout.write('Choose a number from 1 through 10!\nIs the number ... ')
  } else if (input === secretValue) {
    process.stdout.write('Woah you got it! Are you psychic? See you later!\n')
    process.exit();
  } else {
    process.stdout.write("Nope. Guess again!\nIs the number ... ");
  }
  }
}