const fs = require('fs');
const readline = require('readline');

(async() => {
  const delay = t => new Promise(r => setTimeout(r, t));

  const fileStream = fs.createReadStream('./tmp/1.txt');

  fileStream.on('end', async () => console.log('end'));

  const rl = readline.createInterface({
    input: fileStream,
    crlfDelay: Infinity
  });

  for await (const line of rl) {
    await delay(50);
    console.log(`Line from file: ${line}`);
  }
})();