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diff --git a/js/src/builtin/intl/PluralRules.h b/js/src/builtin/intl/PluralRules.h
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+++ b/js/src/builtin/intl/PluralRules.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_PluralRules_h
+#define builtin_intl_PluralRules_h
+
+#include "builtin/SelfHostingDefines.h"
+#include "js/Class.h"
+#include "vm/NativeObject.h"
+
+namespace mozilla::intl {
+class PluralRules;
+}
+
+namespace js {
+
+class PluralRulesObject : public NativeObject {
+ public:
+  static const JSClass class_;
+  static const JSClass& protoClass_;
+
+  static constexpr uint32_t INTERNALS_SLOT = 0;
+  static constexpr uint32_t PLURAL_RULES_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 UPluralRules (see IcuMemoryUsage).
+  // Includes usage for UNumberFormat and UNumberRangeFormatter since our
+  // PluralRules implementations contains a NumberFormat and a NumberRangeFormat
+  // object.
+  static constexpr size_t UPluralRulesEstimatedMemoryUse = 5736;
+
+  mozilla::intl::PluralRules* getPluralRules() const {
+    const auto& slot = getFixedSlot(PLURAL_RULES_SLOT);
+    if (slot.isUndefined()) {
+      return nullptr;
+    }
+    return static_cast<mozilla::intl::PluralRules*>(slot.toPrivate());
+  }
+
+  void setPluralRules(mozilla::intl::PluralRules* pluralRules) {
+    setFixedSlot(PLURAL_RULES_SLOT, PrivateValue(pluralRules));
+  }
+
+ private:
+  static const JSClassOps classOps_;
+  static const ClassSpec classSpec_;
+
+  static void finalize(JS::GCContext* gcx, JSObject* obj);
+};
+
+/**
+ * Returns a plural rule for the number x according to the effective
+ * locale and the formatting options of the given PluralRules.
+ *
+ * A plural rule is a grammatical category that expresses count distinctions
+ * (such as "one", "two", "few" etc.).
+ *
+ * Usage: rule = intl_SelectPluralRule(pluralRules, x)
+ */
+[[nodiscard]] extern bool intl_SelectPluralRule(JSContext* cx, unsigned argc,
+                                                JS::Value* vp);
+
+/**
+ * Returns a plural rule for the number range «x - y» according to the effective
+ * locale and the formatting options of the given PluralRules.
+ *
+ * A plural rule is a grammatical category that expresses count distinctions
+ * (such as "one", "two", "few" etc.).
+ *
+ * Usage: rule = intl_SelectPluralRuleRange(pluralRules, x, y)
+ */
+[[nodiscard]] extern bool intl_SelectPluralRuleRange(JSContext* cx,
+                                                     unsigned argc,
+                                                     JS::Value* vp);
+
+/**
+ * Returns an array of plural rules categories for a given pluralRules object.
+ *
+ * Usage: categories = intl_GetPluralCategories(pluralRules)
+ *
+ * Example:
+ *
+ * pluralRules = new Intl.PluralRules('pl', {type: 'cardinal'});
+ * intl_getPluralCategories(pluralRules); // ['one', 'few', 'many', 'other']
+ */
+[[nodiscard]] extern bool intl_GetPluralCategories(JSContext* cx, unsigned argc,
+                                                   JS::Value* vp);
+
+}  // namespace js
+
+#endif /* builtin_intl_PluralRules_h */