Node.js readline inside of promises

I'm trying to use the node.js package readline to get user input on the command line, and I want to pipe the entered input through promises. However, the input never gets through the then chain. I think the problem could come from the fact that the promises are fulfilled in the callback method, but I don't know how to solve that problem.

An example of this problem looks like this:

import rlp = require('readline');

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

let prom = new Promise(resolve => {
  rl.question('Enter input: ', input => rl.close() && resolve(input));
});

prom
  .then(result => { console.log(result); return prom; })
  .then(result => { console.log(result); return prom; })
  .then(result => console.log(result));

If run in node.js, the question will appear once, after input has been entered the program just stops. I want it to wait until the first input has been entered, then it should print this input and ask for the next input.

Thanks in advance!

Once your promise is resolved, there's no use of waiting for that again. I also moved the rl.close() call to the end, as it's needed to be called only once.

const rlp = require('readline');

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

function ask() {
  return new Promise(resolve => {
    rl.question('Enter input: ', input => resolve(input));
  });
}

ask()
  .then(result => { console.log(result); return ask(); })
  .then(result => { console.log(result); return ask(); })
  .then(result => { console.log(result); rl.close() });