perf: optimize event emission by passing filters by reference

.changes/refactor-option-reference.md

@@ -0,0 +1,6 @@
+---
+"tauri": perf
+"@tauri-apps/api": perf
+---
+
+Optimized event emission by passing filters by reference, reducing closure move overhead and improving memory ergonomics. No user facing changes.

crates/tauri/src/event/listener.rs

@@ -198,7 +198,7 @@ impl Listeners {
       Ok(lock) => {
         if let Some(handlers) = lock.get(&emit_args.event) {
           let handlers = handlers.iter();
-          let handlers = handlers.filter(|(_, h)| match_any_or_filter(&h.target, &filter));
+          let handlers = handlers.filter(|(_, h)| match_any_or_filter(&h.target, filter.as_ref()));
           for (&id, Handler { callback, .. }) in handlers {
             maybe_pending = true;
             (callback)(Event::new(id, emit_args.payload.clone()))
@@ -283,7 +283,7 @@ impl Listeners {
       if let Some(handlers) = js_listeners.get(webview.label()).and_then(|s| s.get(event)) {
         let ids = handlers
           .iter()
-          .filter(|handler| match_any_or_filter(&handler.target, &filter))
+          .filter(|handler| match_any_or_filter(&handler.target, filter.as_ref()))
           .map(|handler| handler.id)
           .collect::<Vec<_>>();
         webview.emit_js(emit_args, &ids)?;
@@ -305,7 +305,7 @@ impl Listeners {
 #[inline(always)]
 fn match_any_or_filter<F: Fn(&EventTarget) -> bool>(
   target: &EventTarget,
-  filter: &Option<F>,
+  filter: Option<&F>,
 ) -> bool {
   *target == EventTarget::Any || filter.as_ref().map(|f| f(target)).unwrap_or(true)
 }

crates/tauri/src/lib.rs

@@ -1029,7 +1029,7 @@ pub trait Emitter<R: Runtime>: sealed::ManagerBase<R> {
   {
     let event = EventName::new(event)?;
     let payload = EmitPayload::Serialize(&payload);
-    self.manager().emit_filter(event, payload, filter)
+    self.manager().emit_filter(event, payload, &filter)
   }
 
   /// Similar to [`Emitter::emit_filter`] but the payload is json serialized.
@@ -1039,7 +1039,7 @@ pub trait Emitter<R: Runtime>: sealed::ManagerBase<R> {
   {
     let event = EventName::new(event)?;
     let payload = EmitPayload::<()>::Str(payload);
-    self.manager().emit_filter(event, payload, filter)
+    self.manager().emit_filter(event, payload, &filter)
   }
 }
 

crates/tauri/src/manager/mod.rs

@@ -557,7 +557,7 @@ impl<R: Runtime> AppManager<R> {
     &self,
     event: EventName<&str>,
     payload: EmitPayload<'_, S>,
-    filter: F,
+    filter: &F,
   ) -> crate::Result<()>
   where
     S: Serialize,
@@ -578,7 +578,7 @@ impl<R: Runtime> AppManager<R> {
       Some(&filter),
     )?;
 
-    listeners.emit_filter(emit_args, Some(filter))?;
+    listeners.emit_filter(emit_args, Some(&filter))?;
 
     Ok(())
   }
@@ -631,7 +631,7 @@ impl<R: Runtime> AppManager<R> {
     match target {
       // if targeting all, emit to all using emit without filter
       EventTarget::Any => self.emit(event, payload),
-      target => self.emit_filter(event, payload, |t| filter_target(&target, t)),
+      target => self.emit_filter(event, payload, &|t| filter_target(&target, t)),
     }
   }
 

crates/tauri/src/manager/webview.rs

@@ -663,7 +663,7 @@ impl<R: Runtime> Webview<R> {
     let payload = EmitPayload::Serialize(payload);
     self
       .manager()
-      .emit_filter(event, payload, |target| match target {
+      .emit_filter(event, payload, &|target| match target {
         EventTarget::Webview { label } | EventTarget::WebviewWindow { label } => {
           label == window_label
         }

crates/tauri/src/manager/window.rs

@@ -133,7 +133,7 @@ impl<R: Runtime> Window<R> {
     let payload = EmitPayload::Serialize(payload);
     self
       .manager()
-      .emit_filter(event, payload, |target| match target {
+      .emit_filter(event, payload, &|target| match target {
         EventTarget::Window { label } | EventTarget::WebviewWindow { label } => {
           label == window_label
         }