Function doWatch

test/parallel/test-fs-watchfile.js:93–103

()

if (common.isLinux || common.isMacOS || common.isWindows) {
  const dir = tmpdir.resolve('watch');
  function doWatch() {
    const handle = fs.watch(dir, common.mustCall(function(eventType, filename) {
      clearInterval(interval);
      handle.close();
      assert.strictEqual(filename, 'foo.txt');
    }));

    const interval = setInterval(() => {
      fs.writeFile(path.join(dir, 'foo.txt'), 'foo', common.mustSucceed());
    }, 1);
  }

  fs.mkdir(dir, common.mustSucceed(() => {
    if (common.isMacOS) {