fix: fix build on macos

src/lib.rs

@@ -6,6 +6,9 @@ mod platform_impl;
 #[cfg(target_os = "linux")]
 #[path = "platform_impl/linux.rs"]
 mod platform_impl;
+#[cfg(target_os = "macos")]
+#[path = "platform_impl/macos.rs"]
+mod platform_impl;
 
 pub(crate) type SingleInstanceCallback<R> =
     dyn FnMut(&AppHandle<R>, Vec<String>, String) + Send + Sync + 'static;
@@ -13,6 +16,5 @@ pub(crate) type SingleInstanceCallback<R> =
 pub fn init<R: Runtime, F: FnMut(&AppHandle<R>, Vec<String>, String) + Send + Sync + 'static>(
     f: F,
 ) -> TauriPlugin<R> {
-    #[cfg(any(target_os = "windows", target_os = "linux"))]
     platform_impl::init(Box::new(f))
 }

src/platform_impl/macos.rs

@@ -0,0 +1,10 @@
+#![cfg(target_os = "macos")]
+
+use crate::SingleInstanceCallback;
+use tauri::{
+    plugin::{self, TauriPlugin},
+    Runtime,
+};
+pub fn init<R: Runtime>(f: Box<SingleInstanceCallback<R>>) -> TauriPlugin<R> {
+    plugin::Builder::new("single-instance").build()
+}