Added google.protobuf.Empty which serializes to {}.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "prost-wkt"
-version = "0.4.0"
+version = "0.4.1"
 authors = ["fdeantoni <[email protected]>"]
 license = "Apache-2.0"
 repository = "https://github.com/fdeantoni/prost-wkt"
@@ -13,7 +13,7 @@ edition = "2021"
 members = [ "wkt-build", "wkt-types", "example" ]
 
 [dependencies]
-prost = "0.11.5"
+prost = "0.11.6"
 inventory = "0.3.0"
 serde = "1.0"
 serde_json = "1.0"

example/Cargo.toml

@@ -1,11 +1,11 @@
 [package]
 name = "prost-wkt-example"
-version = "0.4.0"
+version = "0.4.1"
 authors = ["fdeantoni <[email protected]>"]
 edition = "2021"
 
 [dependencies]
-prost = "0.11.5"
+prost = "0.11.6"
 prost-wkt = { path = ".." }
 prost-wkt-types = { path = "../wkt-types" }
 serde = "1.0"

wkt-build/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "prost-wkt-build"
-version = "0.4.0"
+version = "0.4.1"
 authors = ["fdeantoni <[email protected]>"]
 license = "Apache-2.0"
 repository = "https://github.com/fdeantoni/prost-wkt"
@@ -10,7 +10,7 @@ documentation = "https://docs.rs/prost-wkt-build"
 edition = "2021"
 
 [dependencies]
-prost = "0.11.5"
+prost = "0.11.6"
 prost-types = "0.11.5"
 prost-build = "0.11.5"
 quote = "1.0"

wkt-types/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "prost-wkt-types"
-version = "0.4.0"
+version = "0.4.1"
 authors = ["fdeantoni <[email protected]>"]
 license = "Apache-2.0"
 repository = "https://github.com/fdeantoni/prost-wkt"
@@ -19,16 +19,16 @@ default = ["std"]
 std = []
 
 [dependencies]
-prost-wkt = { version = "0.4.0", path = ".." }
-prost = "0.11.5"
+prost-wkt = { version = "0.4.1", path = ".." }
+prost = "0.11.6"
 serde = "1.0"
 serde_json = "1.0"
 serde_derive = "1.0"
 chrono = { version = "0.4", default-features = false, features = ["serde"] }
 
 [build-dependencies]
-prost = "0.11.5"
+prost = "0.11.6"
 prost-types = "0.11.5"
 prost-build = "0.11.5"
-prost-wkt-build = { version = "0.4.0", path = "../wkt-build" }
+prost-wkt-build = { version = "0.4.1", path = "../wkt-build" }
 regex = "1"

wkt-types/build.rs

@@ -17,6 +17,7 @@ fn main() {
     build(&dir, "pbtime");
     build(&dir, "pbstruct");
     build(&dir, "pbany");
+    build(&dir, "pbempty");
 }
 
 fn build(dir: &Path, proto: &str) {
@@ -30,6 +31,7 @@ fn build(dir: &Path, proto: &str) {
         .type_attribute("google.protobuf.Struct","#[derive(serde_derive::Serialize, serde_derive::Deserialize)] #[serde(default, rename_all=\"camelCase\")]")
         .type_attribute("google.protobuf.ListValue","#[derive(serde_derive::Serialize, serde_derive::Deserialize)] #[serde(default, rename_all=\"camelCase\")]")
         .type_attribute("google.protobuf.Duration","#[derive(serde_derive::Serialize, serde_derive::Deserialize)] #[serde(default, rename_all=\"camelCase\")]")
+        .type_attribute("google.protobuf.Empty","#[derive(serde_derive::Serialize, serde_derive::Deserialize)]")
         .file_descriptor_set_path(&descriptor_file)
         .out_dir(&out)
         .compile_protos(

wkt-types/proto/pbempty.proto

@@ -0,0 +1,5 @@
+syntax = "proto3";
+
+import "google/protobuf/empty.proto";
+
+package empty;

wkt-types/src/lib.rs

@@ -9,4 +9,7 @@ pub use crate::pbstruct::*;
 mod pbany;
 pub use crate::pbany::*;
 
+mod pbempty;
+pub use crate::pbempty::*;
+
 pub use prost_wkt::MessageSerde;

wkt-types/src/pbempty.rs

@@ -0,0 +1,36 @@
+include!(concat!(env!("OUT_DIR"), "/pbempty/google.protobuf.rs"));
+
+const EMPTY: Empty = Empty {};
+
+impl From<()> for Empty {
+    fn from(_value: ()) -> Self {
+        EMPTY
+    }
+}
+
+#[cfg(test)]
+mod tests {
+
+    use crate::pbempty::*;
+
+    #[test]
+    fn serialize_empty() {
+        let msg = EMPTY;
+        println!(
+            "Serialized to string: {}",
+            serde_json::to_string_pretty(&msg).unwrap()
+        );
+    }
+
+    #[test]
+    fn deserialize_empty() {
+        let msg: Empty = serde_json::from_str("{}").expect("Could not deserialize `{}` to an Empty struct!");
+        assert_eq!(msg, EMPTY);
+    }
+
+    #[test]
+    fn convert_unit() {
+        let msg: Empty = ().into();
+        assert_eq!(msg, Empty {});
+    }
+}