Add empty.proto

types/known/emptypb/empty.proto

@@ -0,0 +1,20 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// Copyright 2022 Teppei Fukuda.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+
+syntax = "proto3";
+
+package emptyppb;
+
+option go_package = "github.com/knqyf263/go-plugin/types/known/emptypb";
+
+// A generic empty message that you can re-use to avoid defining duplicated
+// empty messages in your APIs. A typical example is to use it as the request
+// or the response type of an API method. For instance:
+//
+//     service Foo {
+//       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
+//     }
+//
+message Empty {}