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diff --git a/js/public/WrapperCallbacks.h b/js/public/WrapperCallbacks.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef js_WrapperCallbacks_h
+#define js_WrapperCallbacks_h
+
+#include "js/TypeDecls.h"
+
+/**
+ * Callback used to ask the embedding for the cross compartment wrapper handler
+ * that implements the desired prolicy for this kind of object in the
+ * destination compartment. |obj| is the object to be wrapped. If |existing| is
+ * non-nullptr, it will point to an existing wrapper object that should be
+ * re-used if possible. |existing| is guaranteed to be a cross-compartment
+ * wrapper with a lazily-defined prototype and the correct global. It is
+ * guaranteed not to wrap a function.
+ */
+using JSWrapObjectCallback = JSObject* (*)(JSContext*, JS::HandleObject,
+                                           JS::HandleObject);
+
+/**
+ * Callback used by the wrap hook to ask the embedding to prepare an object
+ * for wrapping in a context. This might include unwrapping other wrappers
+ * or even finding a more suitable object for the new compartment. If |origObj|
+ * is non-null, then it is the original object we are going to swap into during
+ * a transplant.
+ */
+using JSPreWrapCallback = void (*)(JSContext*, JS::HandleObject,
+                                   JS::HandleObject, JS::HandleObject,
+                                   JS::HandleObject, JS::MutableHandleObject);
+
+struct JSWrapObjectCallbacks {
+  JSWrapObjectCallback wrap;
+  JSPreWrapCallback preWrap;
+};
+
+#endif  // js_WrapperCallbacks_h