import { promises as fs } from "fs";

const read_file = async (fname) => {
  try {
    let file = await fs.open(fname, 'r');
    let stat = await file.stat();
    let buffer = Buffer.alloc(stat.size);
    let result = await file.read(buffer, 0, stat.size, null);
    console.log(`Read ${result.bytesRead} bytes: ${result.buffer.toString()}`);
  } catch(err) {
    console.log("ERROR", err);
  }
}

// This only works if your package.json has "type": "module",
// or if you name the file async.mjs.
await read_file('test.txt');