watch

type Options struct {
	// Root is the directory tree to watch.
	Root string
	// Ignore reports whether path should not trigger a re-render or be
	// followed as a directory. Called with absolute paths.
	Ignore func(path string) bool
	// Interval is the debounce window; zero uses DefaultInterval.
	Interval time.Duration
	// OnChange re-renders the document after a quiet period. Called from the
	// watch loop, so it must not block indefinitely.
	OnChange func() error
}