Use PollWatcher in memofs StdBackend on macOS (#783)

CHANGELOG.md

@@ -116,6 +116,7 @@
 * Add buttons for navigation on the Connected page ([#722])
 
 ### Fixes
+* Significantly improved performance of `rojo serve` and `rojo build` on macOS. [#783]
 * Significantly improved performance of `rojo sourcemap` ([#668])
 * Fixed the diff visualizer of connected sessions. ([#674])
 * Fixed disconnected session activity. ([#675])
@@ -149,6 +150,7 @@
 [#770]: https://github.com/rojo-rbx/rojo/pull/770
 [#771]: https://github.com/rojo-rbx/rojo/pull/771
 [#774]: https://github.com/rojo-rbx/rojo/pull/774
+[#783]: https://github.com/rojo-rbx/rojo/pull/783
 [rbx-dom#299]: https://github.com/rojo-rbx/rbx-dom/pull/299
 [rbx-dom#296]: https://github.com/rojo-rbx/rbx-dom/pull/296
 

crates/memofs/CHANGELOG.md

@@ -1,6 +1,7 @@
 # memofs Changelog
 
 ## Unreleased Changes
+* Changed the `StdBackend` file watcher to use `PollWatcher` on macOS.
 
 ## 0.2.0 (2021-08-23)
 * Updated to `crossbeam-channel` 0.5.1.

crates/memofs/src/std_backend.rs

@@ -5,19 +5,34 @@ use std::thread;
 use std::time::Duration;
 
 use crossbeam_channel::Receiver;
-use notify::{watcher, DebouncedEvent, RecommendedWatcher, RecursiveMode, Watcher};
+use notify::{DebouncedEvent, RecursiveMode, Watcher};
+
+#[cfg(target_os = "macos")]
+use notify::PollWatcher;
+#[cfg(not(target_os = "macos"))]
+use notify::{watcher, RecommendedWatcher};
 
 use crate::{DirEntry, Metadata, ReadDir, VfsBackend, VfsEvent};
 
 /// `VfsBackend` that uses `std::fs` and the `notify` crate.
 pub struct StdBackend {
+    // We use PollWatcher on macos because using the KQueue watcher
+    // can cause some gnarly performance problems.
+    #[cfg(target_os = "macos")]
+    watcher: PollWatcher,
+    #[cfg(not(target_os = "macos"))]
     watcher: RecommendedWatcher,
+
     watcher_receiver: Receiver<VfsEvent>,
 }
 
 impl StdBackend {
     pub fn new() -> StdBackend {
         let (notify_tx, notify_rx) = mpsc::channel();
+
+        #[cfg(target_os = "macos")]
+        let watcher = PollWatcher::new(notify_tx, Duration::from_millis(50)).unwrap();
+        #[cfg(not(target_os = "macos"))]
         let watcher = watcher(notify_tx, Duration::from_millis(50)).unwrap();
 
         let (tx, rx) = crossbeam_channel::unbounded();