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diff --git a/js/src/vm/EqualityOperations.h b/js/src/vm/EqualityOperations.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * 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/. */
+
+/*
+ * The equality comparisons of js/Equality.h, but with extra efficiency for
+ * SpiderMonkey-internal callers.
+ *
+ * These functions, assuming they're passed C++-valid arguments, are identical
+ * to the same-named JS::-namespaced functions -- just with hidden linkage (so
+ * they're more efficient to call), and without various external-caller-focused
+ * JSAPI-usage assertions performed that SpiderMonkey users never come close to
+ * failing.
+ */
+
+#ifndef vm_EqualityOperations_h
+#define vm_EqualityOperations_h
+
+#include "js/RootingAPI.h"  // JS::Handle
+#include "js/Value.h"       // JS::Value
+
+struct JSContext;
+
+namespace js {
+
+/** Computes |lval === rval|. */
+extern bool
+StrictlyEqual(JSContext* cx, JS::HandleValue lval, JS::HandleValue rval, bool* equal);
+
+/** Computes |lval == rval|. */
+extern bool
+LooselyEqual(JSContext* cx, JS::HandleValue lval, JS::HandleValue rval, bool* result);
+
+/**
+ * Computes |SameValue(v1, v2)| -- strict equality except that NaNs are
+ * considered equal and opposite-signed zeroes are considered unequal.
+ */
+extern bool
+SameValue(JSContext* cx, JS::HandleValue v1, JS::HandleValue v2, bool* same);
+
+}  // namespace js
+
+#endif  // vm_EqualityOperations_h