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diff --git a/src/abi/js.h b/src/abi/js.h
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+/*
+ * Copyright 2018 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 wasm_abi_abi_h
+#define wasm_abi_abi_h
+
+#include "wasm.h"
+
+namespace wasm {
+
+namespace ABI {
+
+enum LegalizationLevel {
+  Full = 0,
+  Minimal = 1
+};
+
+inline std::string getLegalizationPass(LegalizationLevel level) {
+  if (level == Full) {
+    return "legalize-js-interface";
+  } else {
+    return "legalize-js-interface-minimally";
+  }
+}
+
+} // namespace ABI
+
+} // namespace wasm
+
+#endif // wasm_abi_abi_h