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diff --git a/js/public/SharedArrayBuffer.h b/js/public/SharedArrayBuffer.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/. */
+
+/* ArrayBuffer functionality. */
+
+#ifndef js_SharedArrayBuffer_h
+#define js_SharedArrayBuffer_h
+
+#include <stddef.h>  // size_t
+#include <stdint.h>  // uint32_t
+
+#include "jstypes.h"  // JS_PUBLIC_API
+
+#include "js/GCAPI.h"  // JS::AutoRequireNoGC
+
+struct JS_PUBLIC_API JSContext;
+class JS_PUBLIC_API JSObject;
+
+namespace JS {
+
+// CREATION
+
+/**
+ * Create a new SharedArrayBuffer with the given byte length.  This
+ * may only be called if
+ * JS::RealmCreationOptionsRef(cx).getSharedMemoryAndAtomicsEnabled() is
+ * true.
+ */
+extern JS_PUBLIC_API JSObject* NewSharedArrayBuffer(JSContext* cx,
+                                                    uint32_t nbytes);
+
+// TYPE TESTING
+
+/**
+ * Check whether obj supports the JS::GetSharedArrayBuffer* APIs.  Note that
+ * this may return false if a security wrapper is encountered that denies the
+ * unwrapping. If this test succeeds, then it is safe to call the various
+ * accessor JSAPI calls defined below.
+ */
+extern JS_PUBLIC_API bool IsSharedArrayBufferObject(JSObject* obj);
+
+// ACCESSORS
+
+extern JS_PUBLIC_API JSObject* UnwrapSharedArrayBuffer(JSObject* obj);
+
+extern JS_PUBLIC_API uint32_t GetSharedArrayBufferByteLength(JSObject* obj);
+
+extern JS_PUBLIC_API uint8_t* GetSharedArrayBufferData(JSObject* obj,
+                                                       bool* isSharedMemory,
+                                                       const AutoRequireNoGC&);
+
+// Ditto for SharedArrayBuffer.
+//
+// There is an isShared out argument for API consistency (eases use from DOM).
+// It will always be set to true.
+extern JS_PUBLIC_API void GetSharedArrayBufferLengthAndData(
+    JSObject* obj, uint32_t* length, bool* isSharedMemory, uint8_t** data);
+
+/**
+ * Returns true if there are any live SharedArrayBuffer objects, including those
+ * for wasm memories, associated with the context.  This is conservative,
+ * because it does not run GC.  Some dead objects may not have been collected
+ * yet and thus will be thought live.
+ */
+extern JS_PUBLIC_API bool ContainsSharedArrayBuffer(JSContext* cx);
+
+/**
+ * Return the isShared flag of a ArrayBufferView subtypes, which denotes whether
+ * the underlying buffer is a SharedArrayBuffer.
+ *
+ * |obj| must have passed a JS_IsArrayBufferViewObject test, or somehow
+ * be known that it would pass such a test: it is a ArrayBufferView subtypes or
+ * a wrapper of a ArrayBufferView subtypes, and the unwrapping will succeed.
+ */
+extern JS_PUBLIC_API bool IsArrayBufferViewShared(JSObject* obj);
+
+}  // namespace JS
+
+#endif /* js_SharedArrayBuffer_h */