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diff --git a/js/src/zydis/Zydis/Defines.h b/js/src/zydis/Zydis/Defines.h
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+/***************************************************************************************************
+
+  Zyan Disassembler Library (Zydis)
+
+  Original Author : Joel Hoener
+
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+
+***************************************************************************************************/
+
+/**
+ * @file
+ * Import/export defines for MSVC builds.
+ */
+
+#ifndef ZYDIS_DEFINES_H
+#define ZYDIS_DEFINES_H
+
+#include "zydis/Zycore/Defines.h"
+
+// This is a cut-down version of what CMake's `GenerateExportHeader` would usually generate. To
+// simplify builds without CMake, we define these things manually instead of relying on CMake
+// to generate the header.
+//
+// For static builds, our CMakeList will define `ZYDIS_STATIC_BUILD`. For shared library builds,
+// our CMake will define `ZYDIS_SHOULD_EXPORT` depending on whether the target is being imported or
+// exported. If CMake isn't used, users can manually define these to fit their use-case.
+
+// Backward compatibility: CMake would previously generate these variables names. However, because
+// they have pretty cryptic names, we renamed them when we got rid of `GenerateExportHeader`. For
+// backward compatibility for users that don't use CMake and previously manually defined these, we
+// translate the old defines here and print a warning.
+#if defined(ZYDIS_STATIC_DEFINE)
+#   pragma message("ZYDIS_STATIC_DEFINE was renamed to ZYDIS_STATIC_BUILD.")
+#   define ZYDIS_STATIC_BUILD
+#endif
+#if defined(Zydis_EXPORTS)
+#   pragma message("Zydis_EXPORTS was renamed to ZYDIS_SHOULD_EXPORT.")
+#   define ZYDIS_SHOULD_EXPORT
+#endif
+
+/**
+ * Symbol is exported in shared library builds.
+ */
+#if defined(ZYDIS_STATIC_BUILD)
+#   define ZYDIS_EXPORT
+#else
+#   if defined(ZYDIS_SHOULD_EXPORT)
+#       define ZYDIS_EXPORT ZYAN_DLLEXPORT
+#   else
+#       define ZYDIS_EXPORT ZYAN_DLLIMPORT
+#   endif
+#endif
+
+/**
+ * Symbol is not exported and for internal use only.
+ */
+#define ZYDIS_NO_EXPORT
+
+#endif // ZYDIS_DEFINES_H