diff --git a/td/generate/tl_writer_c.h b/td/generate/tl_writer_c.h
index 6a1090a67..98bc31e77 100644
--- a/td/generate/tl_writer_c.h
+++ b/td/generate/tl_writer_c.h
@@ -228,16 +228,28 @@ class TlWriterCCommon final : public tl::TL_writer {
              "#ifdef __cplusplus\n"
              "extern \"C\" {\n"
              "#endif\n"
-             "struct TdBytes {\n"
-             "  unsigned char *data;\n"
-             "  int len;\n"
-             "};\n"
              "#define TDC_VECTOR(tdc_type_name,tdc_type) \\\n"
              "   struct TdVector ## tdc_type_name { \\\n"
              "     int len;\\\n"
              "     tdc_type *data;\\\n"
              "   };\\\n"
-             "\n"
+             "\n";
+    }
+    if (is_header_ == -1) {
+      return "#pragma once\n" + gen_import_declaration("td/telegram/td_tdc_api.h", false) +
+             gen_import_declaration("td/telegram/td_api.h", false);
+    }
+    return gen_import_declaration("td/telegram/td_tdc_api_inner.h", false) + "\n" +
+           gen_import_declaration("td/utils/format.h", false) + gen_import_declaration("td/utils/logging.h", false) +
+           gen_import_declaration("td/utils/misc.h", false) + gen_import_declaration("td/utils/Slice.h", false) + "\n";
+  }
+
+  std::string gen_output_begin_once() const final {
+    if (is_header_ == 1) {
+      return "struct TdBytes {\n"
+             "  unsigned char *data;\n"
+             "  int len;\n"
+             "};\n"
              "TDC_VECTOR(Int,int)\n"
              "TDC_VECTOR(Long,long long)\n"
              "TDC_VECTOR(String,char *)\n"
@@ -265,14 +277,9 @@ class TlWriterCCommon final : public tl::TL_writer {
              "  int (*is_nil)(void);\n"
              "};\n";
     }
-    if (is_header_ == -1) {
-      return "#pragma once\n" + gen_import_declaration("td/telegram/td_tdc_api.h", false) +
-             gen_import_declaration("td/telegram/td_api.h", false);
-    }
-    return gen_import_declaration("td/telegram/td_tdc_api_inner.h", false) + "\n" +
-           gen_import_declaration("td/utils/format.h", false) + gen_import_declaration("td/utils/logging.h", false) +
-           gen_import_declaration("td/utils/misc.h", false) + gen_import_declaration("td/utils/Slice.h", false) + "\n";
+    return std::string();
   }
+
   std::string gen_output_end() const final {
     if (is_header_ == 1) {
       return "#ifdef __cplusplus\n"
diff --git a/td/generate/tl_writer_cpp.cpp b/td/generate/tl_writer_cpp.cpp
index ac5e8b76f..456964aed 100644
--- a/td/generate/tl_writer_cpp.cpp
+++ b/td/generate/tl_writer_cpp.cpp
@@ -29,9 +29,11 @@ std::string TD_TL_writer_cpp::gen_output_begin() const {
          "#include \"td/utils/TlStorerToString.h\"\n\n"
          "namespace td {\n"
          "namespace " +
-         tl_name +
-         " {\n\n"
-         "std::string to_string(const BaseObject &value) {\n"
+         tl_name + " {\n\n";
+}
+
+std::string TD_TL_writer_cpp::gen_output_begin_once() const {
+  return "std::string to_string(const BaseObject &value) {\n"
          "  TlStorerToString storer;\n"
          "  value.store(storer, \"\");\n"
          "  return storer.move_as_string();\n"
diff --git a/td/generate/tl_writer_cpp.h b/td/generate/tl_writer_cpp.h
index 8d983ca1b..71a072ce7 100644
--- a/td/generate/tl_writer_cpp.h
+++ b/td/generate/tl_writer_cpp.h
@@ -42,6 +42,7 @@ class TD_TL_writer_cpp : public TD_TL_writer {
   }
 
   std::string gen_output_begin() const override;
+  std::string gen_output_begin_once() const override;
   std::string gen_output_end() const override;
 
   std::string gen_forward_class_declaration(const std::string &class_name, bool is_proxy) const override;
diff --git a/td/generate/tl_writer_dotnet.h b/td/generate/tl_writer_dotnet.h
index fd9d840c9..e240a2f34 100644
--- a/td/generate/tl_writer_dotnet.h
+++ b/td/generate/tl_writer_dotnet.h
@@ -180,6 +180,7 @@ class TlWriterDotNet final : public TL_writer {
 
     return gen_main_class_name(t) + "^";
   }
+
   std::string gen_output_begin(void) const final {
     return prefix_ +
            "#include \"td/tl/tl_dotnet_object.h\"\n\n"
@@ -187,6 +188,11 @@ class TlWriterDotNet final : public TL_writer {
            "namespace Td {\n"
            "namespace Api {\n";
   }
+
+  std::string gen_output_begin_once(void) const final {
+    return std::string();
+  }
+
   std::string gen_output_end() const final {
     return "}\n"
            "}\n"
diff --git a/td/generate/tl_writer_h.cpp b/td/generate/tl_writer_h.cpp
index 19585d69e..37ace6b7d 100644
--- a/td/generate/tl_writer_h.cpp
+++ b/td/generate/tl_writer_h.cpp
@@ -53,10 +53,11 @@ std::string TD_TL_writer_h::gen_output_begin() const {
          "#include <utility>\n"
          "#include <vector>\n\n"
          "namespace td {\n" +
-         ext_forward_declaration + "namespace " + tl_name +
-         " {\n\n"
+         ext_forward_declaration + "namespace " + tl_name + " {\n\n";
+}
 
-         "using int32 = std::int32_t;\n"
+std::string TD_TL_writer_h::gen_output_begin_once() const {
+  return "using int32 = std::int32_t;\n"
          "using int53 = std::int64_t;\n"
          "using int64 = std::int64_t;\n\n"
 
diff --git a/td/generate/tl_writer_h.h b/td/generate/tl_writer_h.h
index 273087e9c..a32b832c4 100644
--- a/td/generate/tl_writer_h.h
+++ b/td/generate/tl_writer_h.h
@@ -29,6 +29,7 @@ class TD_TL_writer_h : public TD_TL_writer {
   }
 
   std::string gen_output_begin() const override;
+  std::string gen_output_begin_once() const override;
   std::string gen_output_end() const override;
 
   std::string gen_forward_class_declaration(const std::string &class_name, bool is_proxy) const override;
diff --git a/td/generate/tl_writer_hpp.cpp b/td/generate/tl_writer_hpp.cpp
index 6f14a6a7e..020064eb4 100644
--- a/td/generate/tl_writer_hpp.cpp
+++ b/td/generate/tl_writer_hpp.cpp
@@ -57,6 +57,10 @@ std::string TD_TL_writer_hpp::gen_output_begin() const {
          tl_name + " {\n\n";
 }
 
+std::string TD_TL_writer_hpp::gen_output_begin_once() const {
+  return std::string();
+}
+
 std::string TD_TL_writer_hpp::gen_output_end() const {
   return "}  // namespace " + tl_name +
          "\n"
diff --git a/td/generate/tl_writer_hpp.h b/td/generate/tl_writer_hpp.h
index 4c38187b2..cfd1c13a0 100644
--- a/td/generate/tl_writer_hpp.h
+++ b/td/generate/tl_writer_hpp.h
@@ -29,6 +29,7 @@ class TD_TL_writer_hpp final : public TD_TL_writer {
   std::string gen_base_tl_class_name() const final;
 
   std::string gen_output_begin() const final;
+  std::string gen_output_begin_once() const final;
   std::string gen_output_end() const final;
 
   std::string gen_forward_class_declaration(const std::string &class_name, bool is_proxy) const final;
diff --git a/td/generate/tl_writer_java.cpp b/td/generate/tl_writer_java.cpp
index 339fefce2..79e6da3c6 100644
--- a/td/generate/tl_writer_java.cpp
+++ b/td/generate/tl_writer_java.cpp
@@ -191,10 +191,11 @@ std::string TD_TL_writer_java::gen_int_const(const tl::tl_tree *tree_c,
 }
 
 std::string TD_TL_writer_java::gen_output_begin() const {
-  return "package " + package_name +
-         ";\n\n"
-         "public class " +
-         tl_name +
+  return "package " + package_name + ";\n\n";
+}
+
+std::string TD_TL_writer_java::gen_output_begin_once() const {
+  return "public class " + tl_name +
          " {\n"
          "    static {\n"
          "        try {\n"
diff --git a/td/generate/tl_writer_java.h b/td/generate/tl_writer_java.h
index 666486cc0..1ef943cf7 100644
--- a/td/generate/tl_writer_java.h
+++ b/td/generate/tl_writer_java.h
@@ -54,6 +54,7 @@ class TD_TL_writer_java final : public tl::TL_writer {
   std::string gen_int_const(const tl::tl_tree *tree_c, const std::vector<tl::var_description> &vars) const final;
 
   std::string gen_output_begin() const final;
+  std::string gen_output_begin_once() const final;
   std::string gen_output_end() const final;
 
   std::string gen_import_declaration(const std::string &name, bool is_system) const final;
diff --git a/td/generate/tl_writer_jni_cpp.cpp b/td/generate/tl_writer_jni_cpp.cpp
index cc531f54d..5656db787 100644
--- a/td/generate/tl_writer_jni_cpp.cpp
+++ b/td/generate/tl_writer_jni_cpp.cpp
@@ -11,8 +11,8 @@
 
 namespace td {
 
-std::string TD_TL_writer_jni_cpp::gen_output_begin() const {
-  return TD_TL_writer_cpp::gen_output_begin() +
+std::string TD_TL_writer_jni_cpp::gen_output_begin_once() const {
+  return TD_TL_writer_cpp::gen_output_begin_once() +
          "\nstatic const char *package_name = \"Call set_package_name\";\n\n"
          "void set_package_name(const char *new_package_name) {\n"
          "  package_name = new_package_name;\n"
diff --git a/td/generate/tl_writer_jni_cpp.h b/td/generate/tl_writer_jni_cpp.h
index 7ceda54b9..853af8cd4 100644
--- a/td/generate/tl_writer_jni_cpp.h
+++ b/td/generate/tl_writer_jni_cpp.h
@@ -16,7 +16,7 @@
 namespace td {
 
 class TD_TL_writer_jni_cpp final : public TD_TL_writer_cpp {
-  std::string gen_output_begin() const final;
+  std::string gen_output_begin_once() const final;
 
   std::string gen_vector_fetch(std::string field_name, const tl::tl_tree_type *t,
                                const std::vector<tl::var_description> &vars, int parser_type) const;
diff --git a/td/generate/tl_writer_jni_h.cpp b/td/generate/tl_writer_jni_h.cpp
index 095cfed52..cb93b6637 100644
--- a/td/generate/tl_writer_jni_h.cpp
+++ b/td/generate/tl_writer_jni_h.cpp
@@ -76,55 +76,20 @@ std::string TD_TL_writer_jni_h::gen_output_begin() const {
          forward_declaration("TlStorerToString") +
          "\n"
          "namespace " +
-         tl_name +
-         " {\n\n"
+         tl_name + " {\n\n";
+}
 
-         "using int32 = std::int32_t;\n"
-         "using int53 = std::int64_t;\n"
-         "using int64 = std::int64_t;\n\n"
-
-         "using string = " +
-         string_type +
-         ";\n\n"
-
-         "using bytes = " +
-         bytes_type +
-         ";\n\n"
-
-         "template <class Type>\n"
-         "using array = std::vector<Type>;\n\n"
-
-         "class " +
-         gen_base_tl_class_name() +
-         ";\n"
-         "using BaseObject = " +
-         gen_base_tl_class_name() +
-         ";\n\n"
-
-         "template <class Type>\n"
-         "using object_ptr = ::td::tl_object_ptr<Type>;\n\n"
-         "template <class Type, class... Args>\n"
-         "object_ptr<Type> make_object(Args &&... args) {\n"
-         "  return object_ptr<Type>(new Type(std::forward<Args>(args)...));\n"
-         "}\n\n"
-
-         "template <class ToType, class FromType>\n"
-         "object_ptr<ToType> move_object_as(FromType &&from) {\n"
-         "  return object_ptr<ToType>(static_cast<ToType *>(from.release()));\n"
-         "}\n\n"
-
-         "std::string to_string(const BaseObject &value);\n\n"
-
-         "template <class T>\n"
-         "std::string to_string(const object_ptr<T> &value) {\n"
-         "  if (value == nullptr) {\n"
-         "    return \"null\";\n"
-         "  }\n"
-         "\n"
-         "  return to_string(*value);\n"
-         "}\n\n"
-
-         "void set_package_name(const char *new_package_name);\n\n";
+std::string TD_TL_writer_jni_h::gen_output_begin_once() const {
+  std::string result = TD_TL_writer_h::gen_output_begin_once();
+  std::string old_base_object = "using BaseObject = ::td::TlObject";
+  std::size_t pos = result.find(old_base_object);
+  assert(pos != std::string::npos);
+  result.replace(pos, old_base_object.size(),
+                 "class " + gen_base_tl_class_name() +
+                     ";\n"
+                     "using BaseObject = " +
+                     gen_base_tl_class_name());
+  return result + "void set_package_name(const char *new_package_name);\n\n";
 }
 
 std::string TD_TL_writer_jni_h::gen_class_begin(const std::string &class_name, const std::string &base_class_name,
diff --git a/td/generate/tl_writer_jni_h.h b/td/generate/tl_writer_jni_h.h
index 78479756a..f9662a344 100644
--- a/td/generate/tl_writer_jni_h.h
+++ b/td/generate/tl_writer_jni_h.h
@@ -33,6 +33,7 @@ class TD_TL_writer_jni_h final : public TD_TL_writer_h {
   std::string gen_base_tl_class_name() const final;
 
   std::string gen_output_begin() const final;
+  std::string gen_output_begin_once() const final;
 
   std::string gen_class_begin(const std::string &class_name, const std::string &base_class_name, bool is_proxy,
                               const tl::tl_tree *result) const final;
diff --git a/tdtl/td/tl/tl_generate.cpp b/tdtl/td/tl/tl_generate.cpp
index 66d0dcee6..a3d0fd5d5 100644
--- a/tdtl/td/tl/tl_generate.cpp
+++ b/tdtl/td/tl/tl_generate.cpp
@@ -768,6 +768,7 @@ void write_tl(const tl_config &config, tl_outputer &out, const TL_writer &w) {
   find_complex_types(config, w);
 
   out.append(w.gen_output_begin());
+  out.append(w.gen_output_begin_once());
 
   std::set<std::string> request_types;
   std::set<std::string> result_types;
diff --git a/tdtl/td/tl/tl_writer.h b/tdtl/td/tl/tl_writer.h
index 66dbdd1f5..cce63bf8e 100644
--- a/tdtl/td/tl/tl_writer.h
+++ b/tdtl/td/tl/tl_writer.h
@@ -84,6 +84,7 @@ class TL_writer {
   virtual std::string gen_int_const(const tl_tree *tree_c, const std::vector<var_description> &vars) const = 0;
 
   virtual std::string gen_output_begin() const = 0;
+  virtual std::string gen_output_begin_once() const = 0;
   virtual std::string gen_output_end() const = 0;
 
   virtual std::string gen_import_declaration(const std::string &name, bool is_system) const = 0;