Spec cleanup

[50Wliu]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions

Description of the Change

• Remove outdated 1.17 version checks
• Use temp.track() and temp.mkdirSync() rather than os.tmpdir()
• Clean up some ugly watcher code from 2013