javascript generator vs stream API

generator.js

const nReadlines = require("n-readlines");
const fs = require("fs");

const events = require('events');

main().then(() => {
  const used = process.memoryUsage().heapUsed / 1024 / 1024;
  console.log(
    `The script uses approximately ${Math.round(used * 100) / 100} MB`
  );
  process.exit(0);
});

////////////////////////////////////////////////////////////////

function* nReadCursor(filename) {
  const broadbandLines = new nReadlines("test.sql");

  while ((line = broadbandLines.next())) {
    yield line;
  }
}

function useGenerator() {
  let counter = 0;
  for (const line of nReadCursor("test.sql")) {
    // counter++;
    // if (counter % 100000 === 0) {
    //   console.log(counter);
    // }
    // console.log(line);
  }
}

////////////////////////////////////////////////////////////////

async function readFilestream(filename, cb) {
  reader = fs.createReadStream("test.sql");

  reader.on("data", function (chunk) {
    cb(chunk.toString());
  });

  reader

  await events.once(reader, 'close');
}

async function useStream() {
  let counter = 0;
  await readFilestream("test.sql", function (data) {
    // console.log(data)
  });
}

////////////////////////////////////////////////////////////////

async function main() {
  // await useStream()
  useGenerator()
}