All tests run on an 8-year-old MacBook Air.

All results from shipping 7 Mac apps as a solo developer. No sponsored opinion.

HiyokoAutoSync watches directories for changes and triggers sync automatically. notify-rs is the Rust crate for this. Here's what I learned using it in a shipping Tauri app.

Basic setup

toml[dependencies]

notify = "6"

rustuse notify::{RecommendedWatcher, RecursiveMode, Watcher, Config};

use std::sync::mpsc;

fn watch_directory(path: &str) -> Result<(), AppError> {

let (tx, rx) = mpsc::channel();

let mut watcher = RecommendedWatcher::new(tx, Config::default())?; watcher.watch(path.as_ref(), RecursiveMode::Recursive)?;

for res in rx { match res { Ok(event) => handle_event(event), Err(e) => log::error!("Watch error: {:?}", e), } } Ok(())

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}

RecommendedWatcher uses FSEvents on macOS — the native file system event API. Low overhead, fast notification.

The double-fire problem

File save operations often trigger multiple events.…