How to get synchronous readline, or "simulate" it using async, in nodejs?

I am wondering if there is a simple way to get "synchronous" readline or at least get the appearance of synchronous I/O in node.js

I use something like this but it is quite awkward

var readline = require('readline');
var rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  terminal: false
});

var i = 0;
var s1 = '';
var s2 = '';

rl.on('line', function(line){
    if(i==0) { s1 = line; }
    else if(i==1) { s2 = line; }
    i++;
})

rl.on('close', function() {
    //do something with lines
})'

Instead of this I would prefer if it were as easy as something like

var s1 = getline(); // or "await getline()?"
var s2 = getline(); // or "await getline()?"

Helpful conditions:

(a) Prefer not using external modules or /dev/stdio filehandle, I am submitting code to a code submission website and these do not work there

(b) Can use async/await or generators

(c) Should be line based

(d) Should not require reading entire stdin into memory before processing

Just in case someone stumbles upon here in future

Node 11.7 added support for this using async await

const readline = require('readline');
//const fileStream = fs.createReadStream('input.txt');

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

for await (const line of rl) {
  console.log(line)
}

Remember to wrap it in async function(){} otherwise you will get a reserved_keyword_error.

const start = async () =>{
    for await (const line of rl) {
        console.log(line)
    }
}
start()

To read an individual line, you can use the async iterator manually

const it = rl[Symbol.asyncIterator]();
const line1 = await it.next();