refactor: dynamic dispatch async commands in debug (tauri-apps#13464)

* Dynamic dispatch async commands

* format

* Preserve `'static`

* Use a inner function instead

* Only do it for dev for now

* Add change file

* Tag respond_async_serialized_dyn with debug

Author: Legend-Master

.changes/dynamic-dispatch-async-commands.md

@@ -0,0 +1,5 @@
+---
+tauri: "patch:perf"
+---
+
+Use dynamic dispatch for async commands in dev, this should speed up the compilation time by quite a bit, and significantly reduces the incremental compilation time

crates/tauri/src/ipc/mod.rs

@@ -336,6 +336,34 @@ impl<R: Runtime> InvokeResolver<R> {
 
   /// Reply to the invoke promise with an async task which is already serialized.
   pub fn respond_async_serialized<F>(self, task: F)
+  where
+    F: Future<Output = Result<InvokeResponseBody, InvokeError>> + Send + 'static,
+  {
+    // Dynamic dispatch the call in dev for a faster compile time
+    // TODO: Revisit this and see if we can do this for the release build as well if the performace hit is not a problem
+    #[cfg(debug_assertions)]
+    {
+      self.respond_async_serialized_dyn(Box::pin(task))
+    }
+    #[cfg(not(debug_assertions))]
+    {
+      self.respond_async_serialized_inner(task)
+    }
+  }
+
+  /// Dynamic dispatch the [`Self::respond_async_serialized`] call
+  #[cfg(debug_assertions)]
+  fn respond_async_serialized_dyn(
+    self,
+    task: std::pin::Pin<
+      Box<dyn Future<Output = Result<InvokeResponseBody, InvokeError>> + Send + 'static>,
+    >,
+  ) {
+    self.respond_async_serialized_inner(task)
+  }
+
+  /// Reply to the invoke promise with an async task which is already serialized.
+  fn respond_async_serialized_inner<F>(self, task: F)
   where
     F: Future<Output = Result<InvokeResponseBody, InvokeError>> + Send + 'static,
   {