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diff --git a/js/src/builtin/intl/Collator.h b/js/src/builtin/intl/Collator.h
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+++ b/js/src/builtin/intl/Collator.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 builtin_intl_Collator_h
+#define builtin_intl_Collator_h
+
+#include "mozilla/Attributes.h"
+
+#include <stdint.h>
+
+#include "builtin/SelfHostingDefines.h"
+#include "js/Class.h"
+#include "vm/NativeObject.h"
+
+struct UCollator;
+
+namespace js {
+
+/******************** Collator ********************/
+
+class CollatorObject : public NativeObject {
+ public:
+  static const JSClass class_;
+  static const JSClass& protoClass_;
+
+  static constexpr uint32_t INTERNALS_SLOT = 0;
+  static constexpr uint32_t UCOLLATOR_SLOT = 1;
+  static constexpr uint32_t SLOT_COUNT = 2;
+
+  static_assert(INTERNALS_SLOT == INTL_INTERNALS_OBJECT_SLOT,
+                "INTERNALS_SLOT must match self-hosting define for internals "
+                "object slot");
+
+  // Estimated memory use for UCollator (see IcuMemoryUsage).
+  static constexpr size_t EstimatedMemoryUse = 1128;
+
+  UCollator* getCollator() const {
+    const auto& slot = getFixedSlot(UCOLLATOR_SLOT);
+    if (slot.isUndefined()) {
+      return nullptr;
+    }
+    return static_cast<UCollator*>(slot.toPrivate());
+  }
+
+  void setCollator(UCollator* collator) {
+    setFixedSlot(UCOLLATOR_SLOT, PrivateValue(collator));
+  }
+
+ private:
+  static const JSClassOps classOps_;
+  static const ClassSpec classSpec_;
+
+  static void finalize(JSFreeOp* fop, JSObject* obj);
+};
+
+/**
+ * Returns a new instance of the standard built-in Collator constructor.
+ * Self-hosted code cannot cache this constructor (as it does for others in
+ * Utilities.js) because it is initialized after self-hosted code is compiled.
+ *
+ * Usage: collator = intl_Collator(locales, options)
+ */
+extern MOZ_MUST_USE bool intl_Collator(JSContext* cx, unsigned argc,
+                                       JS::Value* vp);
+
+/**
+ * Returns an array with the collation type identifiers per Unicode
+ * Technical Standard 35, Unicode Locale Data Markup Language, for the
+ * collations supported for the given locale. "standard" and "search" are
+ * excluded.
+ *
+ * Usage: collations = intl_availableCollations(locale)
+ */
+extern MOZ_MUST_USE bool intl_availableCollations(JSContext* cx, unsigned argc,
+                                                  JS::Value* vp);
+
+/**
+ * Compares x and y (which must be String values), and returns a number less
+ * than 0 if x < y, 0 if x = y, or a number greater than 0 if x > y according
+ * to the sort order for the locale and collation options of the given
+ * Collator.
+ *
+ * Spec: ECMAScript Internationalization API Specification, 10.3.2.
+ *
+ * Usage: result = intl_CompareStrings(collator, x, y)
+ */
+extern MOZ_MUST_USE bool intl_CompareStrings(JSContext* cx, unsigned argc,
+                                             JS::Value* vp);
+
+/**
+ * Returns true if the given locale sorts upper-case before lower-case
+ * characters.
+ *
+ * Usage: result = intl_isUpperCaseFirst(locale)
+ */
+extern MOZ_MUST_USE bool intl_isUpperCaseFirst(JSContext* cx, unsigned argc,
+                                               JS::Value* vp);
+
+}  // namespace js
+
+#endif /* builtin_intl_Collator_h */