feat: impl Style for frender_common::Empty

Author: EqualMa

packages/frender-style/src/ssr.rs

@@ -19,6 +19,12 @@ pub mod assert {
     {
     }
 
+    impl sealed::DeclarationList for async_str_iter::empty::Empty {}
+    impl DeclarationList for async_str_iter::empty::Empty {}
+
+    impl sealed::DeclarationListPrefixSemicolon for async_str_iter::empty::Empty {}
+    impl DeclarationListPrefixSemicolon for async_str_iter::empty::Empty {}
+
     impl sealed::DeclarationList for async_str_iter::never::Never {}
     impl DeclarationList for async_str_iter::never::Never {}
 
@@ -161,6 +167,22 @@ mod imp {
 
     use super::{sealed, SsrDeclarationList};
 
+    impl sealed::SsrDeclarationList for frender_common::Empty {}
+    impl SsrDeclarationList for frender_common::Empty {
+        type IntoDeclarationList = async_str_iter::empty::Empty;
+        type IntoDeclarationListPrefixSemicolon = async_str_iter::empty::Empty;
+
+        fn into_declaration_list(Self: Self) -> Self::IntoDeclarationList {
+            async_str_iter::empty::Empty
+        }
+
+        fn into_declaration_list_prefix_semicolon(
+            Self: Self,
+        ) -> Self::IntoDeclarationListPrefixSemicolon {
+            async_str_iter::empty::Empty
+        }
+    }
+
     impl<T: SsrDeclarationList> sealed::SsrDeclarationList for Option<T> {}
 
     impl<T: SsrDeclarationList> SsrDeclarationList for Option<T> {

packages/frender-style/src/styles.rs

@@ -1,5 +1,7 @@
 pub use frender_common::Empty;
 
+mod empty;
+
 mod chain;
 pub use chain::Chain;
 

packages/frender-style/src/styles/empty.rs

@@ -0,0 +1,36 @@
+mod csr {
+    use frender_common::Empty;
+
+    use crate::csr::CsrStyle;
+
+    impl CsrStyle for Empty {
+        type State = ();
+
+        fn csr_style_render_init(
+            Self: Self,
+            _: &mut impl crate::csr::CssStyleDeclaration,
+        ) -> Self::State {
+        }
+
+        fn csr_style_render_update(
+            Self: Self,
+            _: &mut impl crate::csr::CssStyleDeclaration,
+            (): &mut Self::State,
+        ) {
+        }
+    }
+}
+
+mod ssr {
+    use frender_common::Empty;
+
+    use crate::ssr::SsrStyle;
+
+    impl SsrStyle for Empty {
+        type IntoSsrDeclarationList = Self;
+
+        fn into_ssr_declaration_list(this: Self) -> Self::IntoSsrDeclarationList {
+            this
+        }
+    }
+}