import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import vfs from 'node:vfs';

const realRoot = fs.mkdtempSync(path.join(os.tmpdir(), 'vfs-real-root-'));
const mountPoint = fs.mkdtempSync(path.join(os.tmpdir(), 'vfs-mount-'));

const mounted = vfs
  .create(new vfs.RealFSProvider(realRoot), { emitExperimentalWarning: false })
  .mount(mountPoint);

try {
  fs.writeFileSync(path.join(realRoot, 'a.txt'), 'still readable');

  const fd = fs.openSync(path.join(mountPoint, 'a.txt'), 'r');
  fs.renameSync(path.join(realRoot, 'a.txt'), path.join(realRoot, 'b.txt'));

  try {
    console.log(fs.readFileSync(fd, 'utf8'));
  } finally {
    fs.closeSync(fd);
  }
} finally {
  mounted.unmount();
  fs.rmSync(realRoot, { recursive: true, force: true });
  fs.rmSync(mountPoint, { recursive: true, force: true });
}