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diff --git a/include/google/protobuf/compiler/python/pyi_generator.h b/include/google/protobuf/compiler/python/pyi_generator.h
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+++ b/include/google/protobuf/compiler/python/pyi_generator.h
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: jieluo@google.com (Jie Luo)
+//
+// Generates Python stub (.pyi) for a given .proto file.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_PYTHON_PYI_GENERATOR_H__
+#define GOOGLE_PROTOBUF_COMPILER_PYTHON_PYI_GENERATOR_H__
+
+#include <map>
+#include <set>
+#include <string>
+
+#include <google/protobuf/stubs/mutex.h>
+#include <google/protobuf/compiler/code_generator.h>
+
+// Must be included last.
+#include <google/protobuf/port_def.inc>
+
+namespace google {
+namespace protobuf {
+class Descriptor;
+class EnumDescriptor;
+class FieldDescriptor;
+class MethodDescriptor;
+class ServiceDescriptor;
+
+namespace io {
+class Printer;
+}
+
+namespace compiler {
+namespace python {
+
+class PROTOC_EXPORT PyiGenerator : public google::protobuf::compiler::CodeGenerator {
+ public:
+  PyiGenerator();
+  ~PyiGenerator() override;
+
+  // CodeGenerator methods.
+  uint64_t GetSupportedFeatures() const override {
+    // Code generators must explicitly support proto3 optional.
+    return CodeGenerator::FEATURE_PROTO3_OPTIONAL;
+  }
+  bool Generate(const FileDescriptor* file, const std::string& parameter,
+                GeneratorContext* generator_context,
+                std::string* error) const override;
+
+ private:
+  void PrintImportForDescriptor(const FileDescriptor& desc,
+                                std::map<std::string, std::string>* import_map,
+                                std::set<std::string>* seen_aliases) const;
+  void PrintImports(std::map<std::string, std::string>* item_map,
+                    std::map<std::string, std::string>* import_map) const;
+  void PrintEnum(const EnumDescriptor& enum_descriptor) const;
+  void AddEnumValue(const EnumDescriptor& enum_descriptor,
+                    std::map<std::string, std::string>* item_map,
+                    const std::map<std::string, std::string>& import_map) const;
+  void PrintTopLevelEnums() const;
+  template <typename DescriptorT>
+  void AddExtensions(const DescriptorT& descriptor,
+                     std::map<std::string, std::string>* item_map) const;
+  void PrintMessages(
+      const std::map<std::string, std::string>& import_map) const;
+  void PrintMessage(const Descriptor& message_descriptor, bool is_nested,
+                    const std::map<std::string, std::string>& import_map) const;
+  void PrintServices() const;
+  void PrintItemMap(const std::map<std::string, std::string>& item_map) const;
+  std::string GetFieldType(
+      const FieldDescriptor& field_des, const Descriptor& containing_des,
+      const std::map<std::string, std::string>& import_map) const;
+  template <typename DescriptorT>
+  std::string ModuleLevelName(
+      const DescriptorT& descriptor,
+      const std::map<std::string, std::string>& import_map) const;
+
+  // Very coarse-grained lock to ensure that Generate() is reentrant.
+  // Guards file_ and printer_.
+  mutable Mutex mutex_;
+  mutable const FileDescriptor* file_;  // Set in Generate().  Under mutex_.
+  mutable io::Printer* printer_;        // Set in Generate().  Under mutex_.
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(PyiGenerator);
+};
+
+}  // namespace python
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
+
+#include <google/protobuf/port_undef.inc>
+
+#endif  // GOOGLE_PROTOBUF_COMPILER_PYTHON_PYI_GENERATOR_H__