fifo.js

queue = [];

rl.on("line", (link) => {
    queue.push(link);
});

while(true) {
    if (queue.length === 0) {
      continue
    }
  
    let link = queue.shift()
  
    await download(link);
}

function download(link) {
  return new Promise((resolve) => {
      let file = await fetch(resolve);
      resolve(link)
  });
}