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diff --git a/third_party/wasm2c/include/wabt/binary-writer-spec.h b/third_party/wasm2c/include/wabt/binary-writer-spec.h
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+++ b/third_party/wasm2c/include/wabt/binary-writer-spec.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2016 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WABT_BINARY_WRITER_SPEC_H_
+#define WABT_BINARY_WRITER_SPEC_H_
+
+#include <functional>
+#include <utility>
+#include <vector>
+
+#include "wabt/binary-writer.h"
+#include "wabt/common.h"
+#include "wabt/ir.h"
+
+namespace wabt {
+
+struct FilenameMemoryStreamPair {
+  FilenameMemoryStreamPair(std::string_view filename,
+                           std::unique_ptr<MemoryStream> stream)
+      : filename(filename), stream(std::move(stream)) {}
+  std::string filename;
+  std::unique_ptr<MemoryStream> stream;
+};
+
+using WriteBinarySpecStreamFactory =
+    std::function<Stream*(std::string_view filename)>;
+
+Result WriteBinarySpecScript(Stream* json_stream,
+                             WriteBinarySpecStreamFactory module_stream_factory,
+                             Script*,
+                             std::string_view source_filename,
+                             std::string_view module_filename_noext,
+                             const WriteBinaryOptions&);
+
+// Convenience function for producing MemoryStream outputs all modules.
+Result WriteBinarySpecScript(
+    Stream* json_stream,
+    Script*,
+    std::string_view source_filename,
+    std::string_view module_filename_noext,
+    const WriteBinaryOptions&,
+    std::vector<FilenameMemoryStreamPair>* out_module_streams,
+    Stream* log_stream = nullptr);
+
+}  // namespace wabt
+
+#endif /* WABT_BINARY_WRITER_SPEC_H_ */